rev 54515 : 8222151: refactoring: enhancements to java.lang.Class::methodToString and java.lang.Class::getTypeName

   1 /*
   2  * Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.lang;
  27 
  28 import java.lang.annotation.Annotation;
  29 import java.lang.constant.ClassDesc;
  30 import java.lang.invoke.TypeDescriptor;
  31 import java.lang.module.ModuleReader;
  32 import java.lang.ref.SoftReference;
  33 import java.io.IOException;
  34 import java.io.InputStream;
  35 import java.io.ObjectStreamField;
  36 import java.lang.reflect.AnnotatedElement;
  37 import java.lang.reflect.AnnotatedType;
  38 import java.lang.reflect.Array;
  39 import java.lang.reflect.Constructor;
  40 import java.lang.reflect.Executable;
  41 import java.lang.reflect.Field;
  42 import java.lang.reflect.GenericArrayType;
  43 import java.lang.reflect.GenericDeclaration;
  44 import java.lang.reflect.InvocationTargetException;
  45 import java.lang.reflect.Member;
  46 import java.lang.reflect.Method;
  47 import java.lang.reflect.Modifier;
  48 import java.lang.reflect.Proxy;
  49 import java.lang.reflect.Type;
  50 import java.lang.reflect.TypeVariable;
  51 import java.lang.constant.Constable;
  52 import java.net.URL;
  53 import java.security.AccessController;
  54 import java.security.PrivilegedAction;
  55 import java.util.ArrayList;
  56 import java.util.Arrays;
  57 import java.util.Collection;
  58 import java.util.HashMap;
  59 import java.util.LinkedHashMap;
  60 import java.util.LinkedHashSet;
  61 import java.util.List;
  62 import java.util.Map;
  63 import java.util.Objects;
  64 import java.util.Optional;
  65 import java.util.StringJoiner;
  66 import java.util.stream.Stream;
  67 import java.util.stream.Collectors;
  68 
  69 import jdk.internal.HotSpotIntrinsicCandidate;
  70 import jdk.internal.loader.BootLoader;
  71 import jdk.internal.loader.BuiltinClassLoader;
  72 import jdk.internal.misc.Unsafe;
  73 import jdk.internal.module.Resources;
  74 import jdk.internal.reflect.CallerSensitive;
  75 import jdk.internal.reflect.ConstantPool;
  76 import jdk.internal.reflect.Reflection;
  77 import jdk.internal.reflect.ReflectionFactory;
  78 import jdk.internal.vm.annotation.ForceInline;
  79 import sun.invoke.util.Wrapper;
  80 import sun.reflect.generics.factory.CoreReflectionFactory;
  81 import sun.reflect.generics.factory.GenericsFactory;
  82 import sun.reflect.generics.repository.ClassRepository;
  83 import sun.reflect.generics.repository.MethodRepository;
  84 import sun.reflect.generics.repository.ConstructorRepository;
  85 import sun.reflect.generics.scope.ClassScope;
  86 import sun.security.util.SecurityConstants;
  87 import sun.reflect.annotation.*;
  88 import sun.reflect.misc.ReflectUtil;
  89 
  90 /**
  91  * Instances of the class {@code Class} represent classes and interfaces
  92  * in a running Java application. An enum type is a kind of class and an
  93  * annotation type is a kind of interface. Every array also
  94  * belongs to a class that is reflected as a {@code Class} object
  95  * that is shared by all arrays with the same element type and number
  96  * of dimensions.  The primitive Java types ({@code boolean},
  97  * {@code byte}, {@code char}, {@code short},
  98  * {@code int}, {@code long}, {@code float}, and
  99  * {@code double}), and the keyword {@code void} are also
 100  * represented as {@code Class} objects.
 101  *
 102  * <p> {@code Class} has no public constructor. Instead a {@code Class}
 103  * object is constructed automatically by the Java Virtual Machine
 104  * when a class loader invokes one of the
 105  * {@link ClassLoader#defineClass(String,byte[], int,int) defineClass} methods
 106  * and passes the bytes of a {@code class} file.
 107  *
 108  * <p> The methods of class {@code Class} expose many characteristics of a
 109  * class or interface. Most characteristics are derived from the {@code class}
 110  * file that the class loader passed to the Java Virtual Machine. A few
 111  * characteristics are determined by the class loading environment at run time,
 112  * such as the module returned by {@link #getModule() getModule()}.
 113  *
 114  * <p> Some methods of class {@code Class} expose whether the declaration of
 115  * a class or interface in Java source code was <em>enclosed</em> within
 116  * another declaration. Other methods describe how a class or interface
 117  * is situated in a <em>nest</em>. A <a id="nest">nest</a> is a set of
 118  * classes and interfaces, in the same run-time package, that
 119  * allow mutual access to their {@code private} members.
 120  * The classes and interfaces are known as <em>nestmates</em>.
 121  * One nestmate acts as the
 122  * <em>nest host</em>, and enumerates the other nestmates which
 123  * belong to the nest; each of them in turn records it as the nest host.
 124  * The classes and interfaces which belong to a nest, including its host, are
 125  * determined when
 126  * {@code class} files are generated, for example, a Java compiler
 127  * will typically record a top-level class as the host of a nest where the
 128  * other members are the classes and interfaces whose declarations are
 129  * enclosed within the top-level class declaration.
 130  *
 131  * <p> The following example uses a {@code Class} object to print the
 132  * class name of an object:
 133  *
 134  * <blockquote><pre>
 135  *     void printClassName(Object obj) {
 136  *         System.out.println("The class of " + obj +
 137  *                            " is " + obj.getClass().getName());
 138  *     }
 139  * </pre></blockquote>
 140  *
 141  * <p> It is also possible to get the {@code Class} object for a named
 142  * type (or for void) using a class literal.  See Section 15.8.2 of
 143  * <cite>The Java&trade; Language Specification</cite>.
 144  * For example:
 145  *
 146  * <blockquote>
 147  *     {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
 148  * </blockquote>
 149  *
 150  * @param <T> the type of the class modeled by this {@code Class}
 151  * object.  For example, the type of {@code String.class} is {@code
 152  * Class<String>}.  Use {@code Class<?>} if the class being modeled is
 153  * unknown.
 154  *
 155  * @author  unascribed
 156  * @see     java.lang.ClassLoader#defineClass(byte[], int, int)
 157  * @since   1.0
 158  */
 159 public final class Class<T> implements java.io.Serializable,
 160                               GenericDeclaration,
 161                               Type,
 162                               AnnotatedElement,
 163                               TypeDescriptor.OfField<Class<?>>,
 164                               Constable {
 165     private static final int ANNOTATION= 0x00002000;
 166     private static final int ENUM      = 0x00004000;
 167     private static final int SYNTHETIC = 0x00001000;
 168 
 169     private static native void registerNatives();
 170     static {
 171         registerNatives();
 172     }
 173 
 174     /*
 175      * Private constructor. Only the Java Virtual Machine creates Class objects.
 176      * This constructor is not used and prevents the default constructor being
 177      * generated.
 178      */
 179     private Class(ClassLoader loader, Class<?> arrayComponentType) {
 180         // Initialize final field for classLoader.  The initialization value of non-null
 181         // prevents future JIT optimizations from assuming this final field is null.
 182         classLoader = loader;
 183         componentType = arrayComponentType;
 184     }
 185 
 186     /**
 187      * Converts the object to a string. The string representation is the
 188      * string "class" or "interface", followed by a space, and then by the
 189      * fully qualified name of the class in the format returned by
 190      * {@code getName}.  If this {@code Class} object represents a
 191      * primitive type, this method returns the name of the primitive type.  If
 192      * this {@code Class} object represents void this method returns
 193      * "void". If this {@code Class} object represents an array type,
 194      * this method returns "class " followed by {@code getName}.
 195      *
 196      * @return a string representation of this class object.
 197      */
 198     public String toString() {
 199         return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
 200             + getName();
 201     }
 202 
 203     /**
 204      * Returns a string describing this {@code Class}, including
 205      * information about modifiers and type parameters.
 206      *
 207      * The string is formatted as a list of type modifiers, if any,
 208      * followed by the kind of type (empty string for primitive types
 209      * and {@code class}, {@code enum}, {@code interface}, or
 210      * <code>@</code>{@code interface}, as appropriate), followed
 211      * by the type's name, followed by an angle-bracketed
 212      * comma-separated list of the type's type parameters, if any,
 213      * including informative bounds on the type parameters, if any.
 214      *
 215      * A space is used to separate modifiers from one another and to
 216      * separate any modifiers from the kind of type. The modifiers
 217      * occur in canonical order. If there are no type parameters, the
 218      * type parameter list is elided.
 219      *
 220      * For an array type, the string starts with the type name,
 221      * followed by an angle-bracketed comma-separated list of the
 222      * type's type parameters, if any, followed by a sequence of
 223      * {@code []} characters, one set of brackets per dimension of
 224      * the array.
 225      *
 226      * <p>Note that since information about the runtime representation
 227      * of a type is being generated, modifiers not present on the
 228      * originating source code or illegal on the originating source
 229      * code may be present.
 230      *
 231      * @return a string describing this {@code Class}, including
 232      * information about modifiers and type parameters
 233      *
 234      * @since 1.8
 235      */
 236     public String toGenericString() {
 237         if (isPrimitive()) {
 238             return toString();
 239         } else {
 240             StringBuilder sb = new StringBuilder();
 241             Class<?> component = this;
 242             int arrayDepth = 0;
 243 
 244             if (isArray()) {
 245                 do {
 246                     arrayDepth++;
 247                     component = component.getComponentType();
 248                 } while (component.isArray());
 249                 sb.append(component.getName());
 250             } else {
 251                 // Class modifiers are a superset of interface modifiers
 252                 int modifiers = getModifiers() & Modifier.classModifiers();
 253                 if (modifiers != 0) {
 254                     sb.append(Modifier.toString(modifiers));
 255                     sb.append(' ');
 256                 }
 257 
 258                 if (isAnnotation()) {
 259                     sb.append('@');
 260                 }
 261                 if (isInterface()) { // Note: all annotation types are interfaces
 262                     sb.append("interface");
 263                 } else {
 264                     if (isEnum())
 265                         sb.append("enum");
 266                     else
 267                         sb.append("class");
 268                 }
 269                 sb.append(' ');
 270                 sb.append(getName());
 271             }
 272 
 273             TypeVariable<?>[] typeparms = component.getTypeParameters();
 274             if (typeparms.length > 0) {
 275                 sb.append(Arrays.stream(typeparms)
 276                           .map(Class::typeVarBounds)
 277                           .collect(Collectors.joining(",", "<", ">")));
 278             }
 279 
 280             for (int i = 0; i < arrayDepth; i++)
 281                 sb.append("[]");
 282 
 283             return sb.toString();
 284         }
 285     }
 286 
 287     static String typeVarBounds(TypeVariable<?> typeVar) {
 288         Type[] bounds = typeVar.getBounds();
 289         if (bounds.length == 1 && bounds[0].equals(Object.class)) {
 290             return typeVar.getName();
 291         } else {
 292             return typeVar.getName() + " extends " +
 293                 Arrays.stream(bounds)
 294                 .map(Type::getTypeName)
 295                 .collect(Collectors.joining(" & "));
 296         }
 297     }
 298 
 299     /**
 300      * Returns the {@code Class} object associated with the class or
 301      * interface with the given string name.  Invoking this method is
 302      * equivalent to:
 303      *
 304      * <blockquote>
 305      *  {@code Class.forName(className, true, currentLoader)}
 306      * </blockquote>
 307      *
 308      * where {@code currentLoader} denotes the defining class loader of
 309      * the current class.
 310      *
 311      * <p> For example, the following code fragment returns the
 312      * runtime {@code Class} descriptor for the class named
 313      * {@code java.lang.Thread}:
 314      *
 315      * <blockquote>
 316      *   {@code Class t = Class.forName("java.lang.Thread")}
 317      * </blockquote>
 318      * <p>
 319      * A call to {@code forName("X")} causes the class named
 320      * {@code X} to be initialized.
 321      *
 322      * @param      className   the fully qualified name of the desired class.
 323      * @return     the {@code Class} object for the class with the
 324      *             specified name.
 325      * @exception LinkageError if the linkage fails
 326      * @exception ExceptionInInitializerError if the initialization provoked
 327      *            by this method fails
 328      * @exception ClassNotFoundException if the class cannot be located
 329      */
 330     @CallerSensitive
 331     public static Class<?> forName(String className)
 332                 throws ClassNotFoundException {
 333         Class<?> caller = Reflection.getCallerClass();
 334         return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
 335     }
 336 
 337 
 338     /**
 339      * Returns the {@code Class} object associated with the class or
 340      * interface with the given string name, using the given class loader.
 341      * Given the fully qualified name for a class or interface (in the same
 342      * format returned by {@code getName}) this method attempts to
 343      * locate, load, and link the class or interface.  The specified class
 344      * loader is used to load the class or interface.  If the parameter
 345      * {@code loader} is null, the class is loaded through the bootstrap
 346      * class loader.  The class is initialized only if the
 347      * {@code initialize} parameter is {@code true} and if it has
 348      * not been initialized earlier.
 349      *
 350      * <p> If {@code name} denotes a primitive type or void, an attempt
 351      * will be made to locate a user-defined class in the unnamed package whose
 352      * name is {@code name}. Therefore, this method cannot be used to
 353      * obtain any of the {@code Class} objects representing primitive
 354      * types or void.
 355      *
 356      * <p> If {@code name} denotes an array class, the component type of
 357      * the array class is loaded but not initialized.
 358      *
 359      * <p> For example, in an instance method the expression:
 360      *
 361      * <blockquote>
 362      *  {@code Class.forName("Foo")}
 363      * </blockquote>
 364      *
 365      * is equivalent to:
 366      *
 367      * <blockquote>
 368      *  {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
 369      * </blockquote>
 370      *
 371      * Note that this method throws errors related to loading, linking or
 372      * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
 373      * Java Language Specification</em>.
 374      * Note that this method does not check whether the requested class
 375      * is accessible to its caller.
 376      *
 377      * @param name       fully qualified name of the desired class
 378      * @param initialize if {@code true} the class will be initialized.
 379      *                   See Section 12.4 of <em>The Java Language Specification</em>.
 380      * @param loader     class loader from which the class must be loaded
 381      * @return           class object representing the desired class
 382      *
 383      * @exception LinkageError if the linkage fails
 384      * @exception ExceptionInInitializerError if the initialization provoked
 385      *            by this method fails
 386      * @exception ClassNotFoundException if the class cannot be located by
 387      *            the specified class loader
 388      * @exception SecurityException
 389      *            if a security manager is present, and the {@code loader} is
 390      *            {@code null}, and the caller's class loader is not
 391      *            {@code null}, and the caller does not have the
 392      *            {@link RuntimePermission}{@code ("getClassLoader")}
 393      *
 394      * @see       java.lang.Class#forName(String)
 395      * @see       java.lang.ClassLoader
 396      * @since     1.2
 397      */
 398     @CallerSensitive
 399     public static Class<?> forName(String name, boolean initialize,
 400                                    ClassLoader loader)
 401         throws ClassNotFoundException
 402     {
 403         Class<?> caller = null;
 404         SecurityManager sm = System.getSecurityManager();
 405         if (sm != null) {
 406             // Reflective call to get caller class is only needed if a security manager
 407             // is present.  Avoid the overhead of making this call otherwise.
 408             caller = Reflection.getCallerClass();
 409             if (loader == null) {
 410                 ClassLoader ccl = ClassLoader.getClassLoader(caller);
 411                 if (ccl != null) {
 412                     sm.checkPermission(
 413                         SecurityConstants.GET_CLASSLOADER_PERMISSION);
 414                 }
 415             }
 416         }
 417         return forName0(name, initialize, loader, caller);
 418     }
 419 
 420     /** Called after security check for system loader access checks have been made. */
 421     private static native Class<?> forName0(String name, boolean initialize,
 422                                             ClassLoader loader,
 423                                             Class<?> caller)
 424         throws ClassNotFoundException;
 425 
 426 
 427     /**
 428      * Returns the {@code Class} with the given <a href="ClassLoader.html#binary-name">
 429      * binary name</a> in the given module.
 430      *
 431      * <p> This method attempts to locate, load, and link the class or interface.
 432      * It does not run the class initializer.  If the class is not found, this
 433      * method returns {@code null}. </p>
 434      *
 435      * <p> If the class loader of the given module defines other modules and
 436      * the given name is a class defined in a different module, this method
 437      * returns {@code null} after the class is loaded. </p>
 438      *
 439      * <p> This method does not check whether the requested class is
 440      * accessible to its caller. </p>
 441      *
 442      * @apiNote
 443      * This method returns {@code null} on failure rather than
 444      * throwing a {@link ClassNotFoundException}, as is done by
 445      * the {@link #forName(String, boolean, ClassLoader)} method.
 446      * The security check is a stack-based permission check if the caller
 447      * loads a class in another module.
 448      *
 449      * @param  module   A module
 450      * @param  name     The <a href="ClassLoader.html#binary-name">binary name</a>
 451      *                  of the class
 452      * @return {@code Class} object of the given name defined in the given module;
 453      *         {@code null} if not found.
 454      *
 455      * @throws NullPointerException if the given module or name is {@code null}
 456      *
 457      * @throws LinkageError if the linkage fails
 458      *
 459      * @throws SecurityException
 460      *         <ul>
 461      *         <li> if the caller is not the specified module and
 462      *         {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
 463      *         <li> access to the module content is denied. For example,
 464      *         permission check will be performed when a class loader calls
 465      *         {@link ModuleReader#open(String)} to read the bytes of a class file
 466      *         in a module.</li>
 467      *         </ul>
 468      *
 469      * @since 9
 470      * @spec JPMS
 471      */
 472     @CallerSensitive
 473     public static Class<?> forName(Module module, String name) {
 474         Objects.requireNonNull(module);
 475         Objects.requireNonNull(name);
 476 
 477         ClassLoader cl;
 478         SecurityManager sm = System.getSecurityManager();
 479         if (sm != null) {
 480             Class<?> caller = Reflection.getCallerClass();
 481             if (caller != null && caller.getModule() != module) {
 482                 // if caller is null, Class.forName is the last java frame on the stack.
 483                 // java.base has all permissions
 484                 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
 485             }
 486             PrivilegedAction<ClassLoader> pa = module::getClassLoader;
 487             cl = AccessController.doPrivileged(pa);
 488         } else {
 489             cl = module.getClassLoader();
 490         }
 491 
 492         if (cl != null) {
 493             return cl.loadClass(module, name);
 494         } else {
 495             return BootLoader.loadClass(module, name);
 496         }
 497     }
 498 
 499     /**
 500      * Creates a new instance of the class represented by this {@code Class}
 501      * object.  The class is instantiated as if by a {@code new}
 502      * expression with an empty argument list.  The class is initialized if it
 503      * has not already been initialized.
 504      *
 505      * @deprecated This method propagates any exception thrown by the
 506      * nullary constructor, including a checked exception.  Use of
 507      * this method effectively bypasses the compile-time exception
 508      * checking that would otherwise be performed by the compiler.
 509      * The {@link
 510      * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
 511      * Constructor.newInstance} method avoids this problem by wrapping
 512      * any exception thrown by the constructor in a (checked) {@link
 513      * java.lang.reflect.InvocationTargetException}.
 514      *
 515      * <p>The call
 516      *
 517      * <pre>{@code
 518      * clazz.newInstance()
 519      * }</pre>
 520      *
 521      * can be replaced by
 522      *
 523      * <pre>{@code
 524      * clazz.getDeclaredConstructor().newInstance()
 525      * }</pre>
 526      *
 527      * The latter sequence of calls is inferred to be able to throw
 528      * the additional exception types {@link
 529      * InvocationTargetException} and {@link
 530      * NoSuchMethodException}. Both of these exception types are
 531      * subclasses of {@link ReflectiveOperationException}.
 532      *
 533      * @return  a newly allocated instance of the class represented by this
 534      *          object.
 535      * @throws  IllegalAccessException  if the class or its nullary
 536      *          constructor is not accessible.
 537      * @throws  InstantiationException
 538      *          if this {@code Class} represents an abstract class,
 539      *          an interface, an array class, a primitive type, or void;
 540      *          or if the class has no nullary constructor;
 541      *          or if the instantiation fails for some other reason.
 542      * @throws  ExceptionInInitializerError if the initialization
 543      *          provoked by this method fails.
 544      * @throws  SecurityException
 545      *          If a security manager, <i>s</i>, is present and
 546      *          the caller's class loader is not the same as or an
 547      *          ancestor of the class loader for the current class and
 548      *          invocation of {@link SecurityManager#checkPackageAccess
 549      *          s.checkPackageAccess()} denies access to the package
 550      *          of this class.
 551      */
 552     @CallerSensitive
 553     @Deprecated(since="9")
 554     public T newInstance()
 555         throws InstantiationException, IllegalAccessException
 556     {
 557         SecurityManager sm = System.getSecurityManager();
 558         if (sm != null) {
 559             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
 560         }
 561 
 562         // Constructor lookup
 563         Constructor<T> tmpConstructor = cachedConstructor;
 564         if (tmpConstructor == null) {
 565             if (this == Class.class) {
 566                 throw new IllegalAccessException(
 567                     "Can not call newInstance() on the Class for java.lang.Class"
 568                 );
 569             }
 570             try {
 571                 Class<?>[] empty = {};
 572                 final Constructor<T> c = getReflectionFactory().copyConstructor(
 573                     getConstructor0(empty, Member.DECLARED));
 574                 // Disable accessibility checks on the constructor
 575                 // access check is done with the true caller
 576                 java.security.AccessController.doPrivileged(
 577                     new java.security.PrivilegedAction<>() {
 578                         public Void run() {
 579                                 c.setAccessible(true);
 580                                 return null;
 581                             }
 582                         });
 583                 cachedConstructor = tmpConstructor = c;
 584             } catch (NoSuchMethodException e) {
 585                 throw (InstantiationException)
 586                     new InstantiationException(getName()).initCause(e);
 587             }
 588         }
 589 
 590         try {
 591             Class<?> caller = Reflection.getCallerClass();
 592             return getReflectionFactory().newInstance(tmpConstructor, null, caller);
 593         } catch (InvocationTargetException e) {
 594             Unsafe.getUnsafe().throwException(e.getTargetException());
 595             // Not reached
 596             return null;
 597         }
 598     }
 599 
 600     private transient volatile Constructor<T> cachedConstructor;
 601 
 602     /**
 603      * Determines if the specified {@code Object} is assignment-compatible
 604      * with the object represented by this {@code Class}.  This method is
 605      * the dynamic equivalent of the Java language {@code instanceof}
 606      * operator. The method returns {@code true} if the specified
 607      * {@code Object} argument is non-null and can be cast to the
 608      * reference type represented by this {@code Class} object without
 609      * raising a {@code ClassCastException.} It returns {@code false}
 610      * otherwise.
 611      *
 612      * <p> Specifically, if this {@code Class} object represents a
 613      * declared class, this method returns {@code true} if the specified
 614      * {@code Object} argument is an instance of the represented class (or
 615      * of any of its subclasses); it returns {@code false} otherwise. If
 616      * this {@code Class} object represents an array class, this method
 617      * returns {@code true} if the specified {@code Object} argument
 618      * can be converted to an object of the array class by an identity
 619      * conversion or by a widening reference conversion; it returns
 620      * {@code false} otherwise. If this {@code Class} object
 621      * represents an interface, this method returns {@code true} if the
 622      * class or any superclass of the specified {@code Object} argument
 623      * implements this interface; it returns {@code false} otherwise. If
 624      * this {@code Class} object represents a primitive type, this method
 625      * returns {@code false}.
 626      *
 627      * @param   obj the object to check
 628      * @return  true if {@code obj} is an instance of this class
 629      *
 630      * @since 1.1
 631      */
 632     @HotSpotIntrinsicCandidate
 633     public native boolean isInstance(Object obj);
 634 
 635 
 636     /**
 637      * Determines if the class or interface represented by this
 638      * {@code Class} object is either the same as, or is a superclass or
 639      * superinterface of, the class or interface represented by the specified
 640      * {@code Class} parameter. It returns {@code true} if so;
 641      * otherwise it returns {@code false}. If this {@code Class}
 642      * object represents a primitive type, this method returns
 643      * {@code true} if the specified {@code Class} parameter is
 644      * exactly this {@code Class} object; otherwise it returns
 645      * {@code false}.
 646      *
 647      * <p> Specifically, this method tests whether the type represented by the
 648      * specified {@code Class} parameter can be converted to the type
 649      * represented by this {@code Class} object via an identity conversion
 650      * or via a widening reference conversion. See <em>The Java Language
 651      * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
 652      *
 653      * @param cls the {@code Class} object to be checked
 654      * @return the {@code boolean} value indicating whether objects of the
 655      * type {@code cls} can be assigned to objects of this class
 656      * @exception NullPointerException if the specified Class parameter is
 657      *            null.
 658      * @since 1.1
 659      */
 660     @HotSpotIntrinsicCandidate
 661     public native boolean isAssignableFrom(Class<?> cls);
 662 
 663 
 664     /**
 665      * Determines if the specified {@code Class} object represents an
 666      * interface type.
 667      *
 668      * @return  {@code true} if this object represents an interface;
 669      *          {@code false} otherwise.
 670      */
 671     @HotSpotIntrinsicCandidate
 672     public native boolean isInterface();
 673 
 674 
 675     /**
 676      * Determines if this {@code Class} object represents an array class.
 677      *
 678      * @return  {@code true} if this object represents an array class;
 679      *          {@code false} otherwise.
 680      * @since   1.1
 681      */
 682     @HotSpotIntrinsicCandidate
 683     public native boolean isArray();
 684 
 685 
 686     /**
 687      * Determines if the specified {@code Class} object represents a
 688      * primitive type.
 689      *
 690      * <p> There are nine predefined {@code Class} objects to represent
 691      * the eight primitive types and void.  These are created by the Java
 692      * Virtual Machine, and have the same names as the primitive types that
 693      * they represent, namely {@code boolean}, {@code byte},
 694      * {@code char}, {@code short}, {@code int},
 695      * {@code long}, {@code float}, and {@code double}.
 696      *
 697      * <p> These objects may only be accessed via the following public static
 698      * final variables, and are the only {@code Class} objects for which
 699      * this method returns {@code true}.
 700      *
 701      * @return true if and only if this class represents a primitive type
 702      *
 703      * @see     java.lang.Boolean#TYPE
 704      * @see     java.lang.Character#TYPE
 705      * @see     java.lang.Byte#TYPE
 706      * @see     java.lang.Short#TYPE
 707      * @see     java.lang.Integer#TYPE
 708      * @see     java.lang.Long#TYPE
 709      * @see     java.lang.Float#TYPE
 710      * @see     java.lang.Double#TYPE
 711      * @see     java.lang.Void#TYPE
 712      * @since 1.1
 713      */
 714     @HotSpotIntrinsicCandidate
 715     public native boolean isPrimitive();
 716 
 717     /**
 718      * Returns true if this {@code Class} object represents an annotation
 719      * type.  Note that if this method returns true, {@link #isInterface()}
 720      * would also return true, as all annotation types are also interfaces.
 721      *
 722      * @return {@code true} if this class object represents an annotation
 723      *      type; {@code false} otherwise
 724      * @since 1.5
 725      */
 726     public boolean isAnnotation() {
 727         return (getModifiers() & ANNOTATION) != 0;
 728     }
 729 
 730     /**
 731      * Returns {@code true} if this class is a synthetic class;
 732      * returns {@code false} otherwise.
 733      * @return {@code true} if and only if this class is a synthetic class as
 734      *         defined by the Java Language Specification.
 735      * @jls 13.1 The Form of a Binary
 736      * @since 1.5
 737      */
 738     public boolean isSynthetic() {
 739         return (getModifiers() & SYNTHETIC) != 0;
 740     }
 741 
 742     /**
 743      * Returns the  name of the entity (class, interface, array class,
 744      * primitive type, or void) represented by this {@code Class} object,
 745      * as a {@code String}.
 746      *
 747      * <p> If this class object represents a reference type that is not an
 748      * array type then the binary name of the class is returned, as specified
 749      * by
 750      * <cite>The Java&trade; Language Specification</cite>.
 751      *
 752      * <p> If this class object represents a primitive type or void, then the
 753      * name returned is a {@code String} equal to the Java language
 754      * keyword corresponding to the primitive type or void.
 755      *
 756      * <p> If this class object represents a class of arrays, then the internal
 757      * form of the name consists of the name of the element type preceded by
 758      * one or more '{@code [}' characters representing the depth of the array
 759      * nesting.  The encoding of element type names is as follows:
 760      *
 761      * <blockquote><table class="striped">
 762      * <caption style="display:none">Element types and encodings</caption>
 763      * <thead>
 764      * <tr><th scope="col"> Element Type <th scope="col"> Encoding
 765      * </thead>
 766      * <tbody style="text-align:left">
 767      * <tr><th scope="row"> boolean      <td style="text-align:center"> Z
 768      * <tr><th scope="row"> byte         <td style="text-align:center"> B
 769      * <tr><th scope="row"> char         <td style="text-align:center"> C
 770      * <tr><th scope="row"> class or interface
 771      *                                   <td style="text-align:center"> L<i>classname</i>;
 772      * <tr><th scope="row"> double       <td style="text-align:center"> D
 773      * <tr><th scope="row"> float        <td style="text-align:center"> F
 774      * <tr><th scope="row"> int          <td style="text-align:center"> I
 775      * <tr><th scope="row"> long         <td style="text-align:center"> J
 776      * <tr><th scope="row"> short        <td style="text-align:center"> S
 777      * </tbody>
 778      * </table></blockquote>
 779      *
 780      * <p> The class or interface name <i>classname</i> is the binary name of
 781      * the class specified above.
 782      *
 783      * <p> Examples:
 784      * <blockquote><pre>
 785      * String.class.getName()
 786      *     returns "java.lang.String"
 787      * byte.class.getName()
 788      *     returns "byte"
 789      * (new Object[3]).getClass().getName()
 790      *     returns "[Ljava.lang.Object;"
 791      * (new int[3][4][5][6][7][8][9]).getClass().getName()
 792      *     returns "[[[[[[[I"
 793      * </pre></blockquote>
 794      *
 795      * @return  the name of the class or interface
 796      *          represented by this object.
 797      */
 798     public String getName() {
 799         String name = this.name;
 800         return name != null ? name : initClassName();
 801     }
 802 
 803     // Cache the name to reduce the number of calls into the VM.
 804     // This field would be set by VM itself during initClassName call.
 805     private transient String name;
 806     private native String initClassName();
 807 
 808     /**
 809      * Returns the class loader for the class.  Some implementations may use
 810      * null to represent the bootstrap class loader. This method will return
 811      * null in such implementations if this class was loaded by the bootstrap
 812      * class loader.
 813      *
 814      * <p>If this object
 815      * represents a primitive type or void, null is returned.
 816      *
 817      * @return  the class loader that loaded the class or interface
 818      *          represented by this object.
 819      * @throws  SecurityException
 820      *          if a security manager is present, and the caller's class loader
 821      *          is not {@code null} and is not the same as or an ancestor of the
 822      *          class loader for the class whose class loader is requested,
 823      *          and the caller does not have the
 824      *          {@link RuntimePermission}{@code ("getClassLoader")}
 825      * @see java.lang.ClassLoader
 826      * @see SecurityManager#checkPermission
 827      * @see java.lang.RuntimePermission
 828      */
 829     @CallerSensitive
 830     @ForceInline // to ensure Reflection.getCallerClass optimization
 831     public ClassLoader getClassLoader() {
 832         ClassLoader cl = getClassLoader0();
 833         if (cl == null)
 834             return null;
 835         SecurityManager sm = System.getSecurityManager();
 836         if (sm != null) {
 837             ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
 838         }
 839         return cl;
 840     }
 841 
 842     // Package-private to allow ClassLoader access
 843     ClassLoader getClassLoader0() { return classLoader; }
 844 
 845     /**
 846      * Returns the module that this class or interface is a member of.
 847      *
 848      * If this class represents an array type then this method returns the
 849      * {@code Module} for the element type. If this class represents a
 850      * primitive type or void, then the {@code Module} object for the
 851      * {@code java.base} module is returned.
 852      *
 853      * If this class is in an unnamed module then the {@linkplain
 854      * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class
 855      * loader for this class is returned.
 856      *
 857      * @return the module that this class or interface is a member of
 858      *
 859      * @since 9
 860      * @spec JPMS
 861      */
 862     public Module getModule() {
 863         return module;
 864     }
 865 
 866     // set by VM
 867     private transient Module module;
 868 
 869     // Initialized in JVM not by private constructor
 870     // This field is filtered from reflection access, i.e. getDeclaredField
 871     // will throw NoSuchFieldException
 872     private final ClassLoader classLoader;
 873 
 874     /**
 875      * Returns an array of {@code TypeVariable} objects that represent the
 876      * type variables declared by the generic declaration represented by this
 877      * {@code GenericDeclaration} object, in declaration order.  Returns an
 878      * array of length 0 if the underlying generic declaration declares no type
 879      * variables.
 880      *
 881      * @return an array of {@code TypeVariable} objects that represent
 882      *     the type variables declared by this generic declaration
 883      * @throws java.lang.reflect.GenericSignatureFormatError if the generic
 884      *     signature of this generic declaration does not conform to
 885      *     the format specified in
 886      *     <cite>The Java&trade; Virtual Machine Specification</cite>
 887      * @since 1.5
 888      */
 889     @SuppressWarnings("unchecked")
 890     public TypeVariable<Class<T>>[] getTypeParameters() {
 891         ClassRepository info = getGenericInfo();
 892         if (info != null)
 893             return (TypeVariable<Class<T>>[])info.getTypeParameters();
 894         else
 895             return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
 896     }
 897 
 898 
 899     /**
 900      * Returns the {@code Class} representing the direct superclass of the
 901      * entity (class, interface, primitive type or void) represented by
 902      * this {@code Class}.  If this {@code Class} represents either the
 903      * {@code Object} class, an interface, a primitive type, or void, then
 904      * null is returned.  If this object represents an array class then the
 905      * {@code Class} object representing the {@code Object} class is
 906      * returned.
 907      *
 908      * @return the direct superclass of the class represented by this object
 909      */
 910     @HotSpotIntrinsicCandidate
 911     public native Class<? super T> getSuperclass();
 912 
 913 
 914     /**
 915      * Returns the {@code Type} representing the direct superclass of
 916      * the entity (class, interface, primitive type or void) represented by
 917      * this {@code Class}.
 918      *
 919      * <p>If the superclass is a parameterized type, the {@code Type}
 920      * object returned must accurately reflect the actual type
 921      * parameters used in the source code. The parameterized type
 922      * representing the superclass is created if it had not been
 923      * created before. See the declaration of {@link
 924      * java.lang.reflect.ParameterizedType ParameterizedType} for the
 925      * semantics of the creation process for parameterized types.  If
 926      * this {@code Class} represents either the {@code Object}
 927      * class, an interface, a primitive type, or void, then null is
 928      * returned.  If this object represents an array class then the
 929      * {@code Class} object representing the {@code Object} class is
 930      * returned.
 931      *
 932      * @throws java.lang.reflect.GenericSignatureFormatError if the generic
 933      *     class signature does not conform to the format specified in
 934      *     <cite>The Java&trade; Virtual Machine Specification</cite>
 935      * @throws TypeNotPresentException if the generic superclass
 936      *     refers to a non-existent type declaration
 937      * @throws java.lang.reflect.MalformedParameterizedTypeException if the
 938      *     generic superclass refers to a parameterized type that cannot be
 939      *     instantiated  for any reason
 940      * @return the direct superclass of the class represented by this object
 941      * @since 1.5
 942      */
 943     public Type getGenericSuperclass() {
 944         ClassRepository info = getGenericInfo();
 945         if (info == null) {
 946             return getSuperclass();
 947         }
 948 
 949         // Historical irregularity:
 950         // Generic signature marks interfaces with superclass = Object
 951         // but this API returns null for interfaces
 952         if (isInterface()) {
 953             return null;
 954         }
 955 
 956         return info.getSuperclass();
 957     }
 958 
 959     /**
 960      * Gets the package of this class.
 961      *
 962      * <p>If this class represents an array type, a primitive type or void,
 963      * this method returns {@code null}.
 964      *
 965      * @return the package of this class.
 966      * @revised 9
 967      * @spec JPMS
 968      */
 969     public Package getPackage() {
 970         if (isPrimitive() || isArray()) {
 971             return null;
 972         }
 973         ClassLoader cl = getClassLoader0();
 974         return cl != null ? cl.definePackage(this)
 975                           : BootLoader.definePackage(this);
 976     }
 977 
 978     /**
 979      * Returns the fully qualified package name.
 980      *
 981      * <p> If this class is a top level class, then this method returns the fully
 982      * qualified name of the package that the class is a member of, or the
 983      * empty string if the class is in an unnamed package.
 984      *
 985      * <p> If this class is a member class, then this method is equivalent to
 986      * invoking {@code getPackageName()} on the {@linkplain #getEnclosingClass
 987      * enclosing class}.
 988      *
 989      * <p> If this class is a {@linkplain #isLocalClass local class} or an {@linkplain
 990      * #isAnonymousClass() anonymous class}, then this method is equivalent to
 991      * invoking {@code getPackageName()} on the {@linkplain #getDeclaringClass
 992      * declaring class} of the {@linkplain #getEnclosingMethod enclosing method} or
 993      * {@linkplain #getEnclosingConstructor enclosing constructor}.
 994      *
 995      * <p> If this class represents an array type then this method returns the
 996      * package name of the element type. If this class represents a primitive
 997      * type or void then the package name "{@code java.lang}" is returned.
 998      *
 999      * @return the fully qualified package name
1000      *
1001      * @since 9
1002      * @spec JPMS
1003      * @jls 6.7  Fully Qualified Names
1004      */
1005     public String getPackageName() {
1006         String pn = this.packageName;
1007         if (pn == null) {
1008             Class<?> c = this;
1009             while (c.isArray()) {
1010                 c = c.getComponentType();
1011             }
1012             if (c.isPrimitive()) {
1013                 pn = "java.lang";
1014             } else {
1015                 String cn = c.getName();
1016                 int dot = cn.lastIndexOf('.');
1017                 pn = (dot != -1) ? cn.substring(0, dot).intern() : "";
1018             }
1019             this.packageName = pn;
1020         }
1021         return pn;
1022     }
1023 
1024     // cached package name
1025     private transient String packageName;
1026 
1027     /**
1028      * Returns the interfaces directly implemented by the class or interface
1029      * represented by this object.
1030      *
1031      * <p>If this object represents a class, the return value is an array
1032      * containing objects representing all interfaces directly implemented by
1033      * the class.  The order of the interface objects in the array corresponds
1034      * to the order of the interface names in the {@code implements} clause of
1035      * the declaration of the class represented by this object.  For example,
1036      * given the declaration:
1037      * <blockquote>
1038      * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
1039      * </blockquote>
1040      * suppose the value of {@code s} is an instance of
1041      * {@code Shimmer}; the value of the expression:
1042      * <blockquote>
1043      * {@code s.getClass().getInterfaces()[0]}
1044      * </blockquote>
1045      * is the {@code Class} object that represents interface
1046      * {@code FloorWax}; and the value of:
1047      * <blockquote>
1048      * {@code s.getClass().getInterfaces()[1]}
1049      * </blockquote>
1050      * is the {@code Class} object that represents interface
1051      * {@code DessertTopping}.
1052      *
1053      * <p>If this object represents an interface, the array contains objects
1054      * representing all interfaces directly extended by the interface.  The
1055      * order of the interface objects in the array corresponds to the order of
1056      * the interface names in the {@code extends} clause of the declaration of
1057      * the interface represented by this object.
1058      *
1059      * <p>If this object represents a class or interface that implements no
1060      * interfaces, the method returns an array of length 0.
1061      *
1062      * <p>If this object represents a primitive type or void, the method
1063      * returns an array of length 0.
1064      *
1065      * <p>If this {@code Class} object represents an array type, the
1066      * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1067      * returned in that order.
1068      *
1069      * @return an array of interfaces directly implemented by this class
1070      */
1071     public Class<?>[] getInterfaces() {
1072         // defensively copy before handing over to user code
1073         return getInterfaces(true);
1074     }
1075 
1076     private Class<?>[] getInterfaces(boolean cloneArray) {
1077         ReflectionData<T> rd = reflectionData();
1078         if (rd == null) {
1079             // no cloning required
1080             return getInterfaces0();
1081         } else {
1082             Class<?>[] interfaces = rd.interfaces;
1083             if (interfaces == null) {
1084                 interfaces = getInterfaces0();
1085                 rd.interfaces = interfaces;
1086             }
1087             // defensively copy if requested
1088             return cloneArray ? interfaces.clone() : interfaces;
1089         }
1090     }
1091 
1092     private native Class<?>[] getInterfaces0();
1093 
1094     /**
1095      * Returns the {@code Type}s representing the interfaces
1096      * directly implemented by the class or interface represented by
1097      * this object.
1098      *
1099      * <p>If a superinterface is a parameterized type, the
1100      * {@code Type} object returned for it must accurately reflect
1101      * the actual type parameters used in the source code. The
1102      * parameterized type representing each superinterface is created
1103      * if it had not been created before. See the declaration of
1104      * {@link java.lang.reflect.ParameterizedType ParameterizedType}
1105      * for the semantics of the creation process for parameterized
1106      * types.
1107      *
1108      * <p>If this object represents a class, the return value is an array
1109      * containing objects representing all interfaces directly implemented by
1110      * the class.  The order of the interface objects in the array corresponds
1111      * to the order of the interface names in the {@code implements} clause of
1112      * the declaration of the class represented by this object.
1113      *
1114      * <p>If this object represents an interface, the array contains objects
1115      * representing all interfaces directly extended by the interface.  The
1116      * order of the interface objects in the array corresponds to the order of
1117      * the interface names in the {@code extends} clause of the declaration of
1118      * the interface represented by this object.
1119      *
1120      * <p>If this object represents a class or interface that implements no
1121      * interfaces, the method returns an array of length 0.
1122      *
1123      * <p>If this object represents a primitive type or void, the method
1124      * returns an array of length 0.
1125      *
1126      * <p>If this {@code Class} object represents an array type, the
1127      * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1128      * returned in that order.
1129      *
1130      * @throws java.lang.reflect.GenericSignatureFormatError
1131      *     if the generic class signature does not conform to the format
1132      *     specified in
1133      *     <cite>The Java&trade; Virtual Machine Specification</cite>
1134      * @throws TypeNotPresentException if any of the generic
1135      *     superinterfaces refers to a non-existent type declaration
1136      * @throws java.lang.reflect.MalformedParameterizedTypeException
1137      *     if any of the generic superinterfaces refer to a parameterized
1138      *     type that cannot be instantiated for any reason
1139      * @return an array of interfaces directly implemented by this class
1140      * @since 1.5
1141      */
1142     public Type[] getGenericInterfaces() {
1143         ClassRepository info = getGenericInfo();
1144         return (info == null) ?  getInterfaces() : info.getSuperInterfaces();
1145     }
1146 
1147 
1148     /**
1149      * Returns the {@code Class} representing the component type of an
1150      * array.  If this class does not represent an array class this method
1151      * returns null.
1152      *
1153      * @return the {@code Class} representing the component type of this
1154      * class if this class is an array
1155      * @see     java.lang.reflect.Array
1156      * @since 1.1
1157      */
1158     public Class<?> getComponentType() {
1159         // Only return for array types. Storage may be reused for Class for instance types.
1160         if (isArray()) {
1161             return componentType;
1162         } else {
1163             return null;
1164         }
1165     }
1166 
1167     private final Class<?> componentType;
1168 
1169 
1170     /**
1171      * Returns the Java language modifiers for this class or interface, encoded
1172      * in an integer. The modifiers consist of the Java Virtual Machine's
1173      * constants for {@code public}, {@code protected},
1174      * {@code private}, {@code final}, {@code static},
1175      * {@code abstract} and {@code interface}; they should be decoded
1176      * using the methods of class {@code Modifier}.
1177      *
1178      * <p> If the underlying class is an array class, then its
1179      * {@code public}, {@code private} and {@code protected}
1180      * modifiers are the same as those of its component type.  If this
1181      * {@code Class} represents a primitive type or void, its
1182      * {@code public} modifier is always {@code true}, and its
1183      * {@code protected} and {@code private} modifiers are always
1184      * {@code false}. If this object represents an array class, a
1185      * primitive type or void, then its {@code final} modifier is always
1186      * {@code true} and its interface modifier is always
1187      * {@code false}. The values of its other modifiers are not determined
1188      * by this specification.
1189      *
1190      * <p> The modifier encodings are defined in <em>The Java Virtual Machine
1191      * Specification</em>, table 4.1.
1192      *
1193      * @return the {@code int} representing the modifiers for this class
1194      * @see     java.lang.reflect.Modifier
1195      * @since 1.1
1196      */
1197     @HotSpotIntrinsicCandidate
1198     public native int getModifiers();
1199 
1200 
1201     /**
1202      * Gets the signers of this class.
1203      *
1204      * @return  the signers of this class, or null if there are no signers.  In
1205      *          particular, this method returns null if this object represents
1206      *          a primitive type or void.
1207      * @since   1.1
1208      */
1209     public native Object[] getSigners();
1210 
1211 
1212     /**
1213      * Set the signers of this class.
1214      */
1215     native void setSigners(Object[] signers);
1216 
1217 
1218     /**
1219      * If this {@code Class} object represents a local or anonymous
1220      * class within a method, returns a {@link
1221      * java.lang.reflect.Method Method} object representing the
1222      * immediately enclosing method of the underlying class. Returns
1223      * {@code null} otherwise.
1224      *
1225      * In particular, this method returns {@code null} if the underlying
1226      * class is a local or anonymous class immediately enclosed by a type
1227      * declaration, instance initializer or static initializer.
1228      *
1229      * @return the immediately enclosing method of the underlying class, if
1230      *     that class is a local or anonymous class; otherwise {@code null}.
1231      *
1232      * @throws SecurityException
1233      *         If a security manager, <i>s</i>, is present and any of the
1234      *         following conditions is met:
1235      *
1236      *         <ul>
1237      *
1238      *         <li> the caller's class loader is not the same as the
1239      *         class loader of the enclosing class and invocation of
1240      *         {@link SecurityManager#checkPermission
1241      *         s.checkPermission} method with
1242      *         {@code RuntimePermission("accessDeclaredMembers")}
1243      *         denies access to the methods within the enclosing class
1244      *
1245      *         <li> the caller's class loader is not the same as or an
1246      *         ancestor of the class loader for the enclosing class and
1247      *         invocation of {@link SecurityManager#checkPackageAccess
1248      *         s.checkPackageAccess()} denies access to the package
1249      *         of the enclosing class
1250      *
1251      *         </ul>
1252      * @since 1.5
1253      */
1254     @CallerSensitive
1255     public Method getEnclosingMethod() throws SecurityException {
1256         EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1257 
1258         if (enclosingInfo == null)
1259             return null;
1260         else {
1261             if (!enclosingInfo.isMethod())
1262                 return null;
1263 
1264             MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
1265                                                               getFactory());
1266             Class<?>   returnType       = toClass(typeInfo.getReturnType());
1267             Type []    parameterTypes   = typeInfo.getParameterTypes();
1268             Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1269 
1270             // Convert Types to Classes; returned types *should*
1271             // be class objects since the methodDescriptor's used
1272             // don't have generics information
1273             for(int i = 0; i < parameterClasses.length; i++)
1274                 parameterClasses[i] = toClass(parameterTypes[i]);
1275 
1276             // Perform access check
1277             final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1278             SecurityManager sm = System.getSecurityManager();
1279             if (sm != null) {
1280                 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
1281                                                      Reflection.getCallerClass(), true);
1282             }
1283             Method[] candidates = enclosingCandidate.privateGetDeclaredMethods(false);
1284 
1285             /*
1286              * Loop over all declared methods; match method name,
1287              * number of and type of parameters, *and* return
1288              * type.  Matching return type is also necessary
1289              * because of covariant returns, etc.
1290              */
1291             ReflectionFactory fact = getReflectionFactory();
1292             for (Method m : candidates) {
1293                 if (m.getName().equals(enclosingInfo.getName()) &&
1294                     arrayContentsEq(parameterClasses,
1295                                     fact.getExecutableSharedParameterTypes(m))) {
1296                     // finally, check return type
1297                     if (m.getReturnType().equals(returnType)) {
1298                         return fact.copyMethod(m);
1299                     }
1300                 }
1301             }
1302 
1303             throw new InternalError("Enclosing method not found");
1304         }
1305     }
1306 
1307     private native Object[] getEnclosingMethod0();
1308 
1309     private EnclosingMethodInfo getEnclosingMethodInfo() {
1310         Object[] enclosingInfo = getEnclosingMethod0();
1311         if (enclosingInfo == null)
1312             return null;
1313         else {
1314             return new EnclosingMethodInfo(enclosingInfo);
1315         }
1316     }
1317 
1318     private static final class EnclosingMethodInfo {
1319         private final Class<?> enclosingClass;
1320         private final String name;
1321         private final String descriptor;
1322 
1323         static void validate(Object[] enclosingInfo) {
1324             if (enclosingInfo.length != 3)
1325                 throw new InternalError("Malformed enclosing method information");
1326             try {
1327                 // The array is expected to have three elements:
1328 
1329                 // the immediately enclosing class
1330                 Class<?> enclosingClass = (Class<?>)enclosingInfo[0];
1331                 assert(enclosingClass != null);
1332 
1333                 // the immediately enclosing method or constructor's
1334                 // name (can be null).
1335                 String name = (String)enclosingInfo[1];
1336 
1337                 // the immediately enclosing method or constructor's
1338                 // descriptor (null iff name is).
1339                 String descriptor = (String)enclosingInfo[2];
1340                 assert((name != null && descriptor != null) || name == descriptor);
1341             } catch (ClassCastException cce) {
1342                 throw new InternalError("Invalid type in enclosing method information", cce);
1343             }
1344         }
1345 
1346         EnclosingMethodInfo(Object[] enclosingInfo) {
1347             validate(enclosingInfo);
1348             this.enclosingClass = (Class<?>)enclosingInfo[0];
1349             this.name = (String)enclosingInfo[1];
1350             this.descriptor = (String)enclosingInfo[2];
1351         }
1352 
1353         boolean isPartial() {
1354             return enclosingClass == null || name == null || descriptor == null;
1355         }
1356 
1357         boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
1358 
1359         boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
1360 
1361         Class<?> getEnclosingClass() { return enclosingClass; }
1362 
1363         String getName() { return name; }
1364 
1365         String getDescriptor() { return descriptor; }
1366 
1367     }
1368 
1369     private static Class<?> toClass(Type o) {
1370         if (o instanceof GenericArrayType)
1371             return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1372                                      0)
1373                 .getClass();
1374         return (Class<?>)o;
1375      }
1376 
1377     /**
1378      * If this {@code Class} object represents a local or anonymous
1379      * class within a constructor, returns a {@link
1380      * java.lang.reflect.Constructor Constructor} object representing
1381      * the immediately enclosing constructor of the underlying
1382      * class. Returns {@code null} otherwise.  In particular, this
1383      * method returns {@code null} if the underlying class is a local
1384      * or anonymous class immediately enclosed by a type declaration,
1385      * instance initializer or static initializer.
1386      *
1387      * @return the immediately enclosing constructor of the underlying class, if
1388      *     that class is a local or anonymous class; otherwise {@code null}.
1389      * @throws SecurityException
1390      *         If a security manager, <i>s</i>, is present and any of the
1391      *         following conditions is met:
1392      *
1393      *         <ul>
1394      *
1395      *         <li> the caller's class loader is not the same as the
1396      *         class loader of the enclosing class and invocation of
1397      *         {@link SecurityManager#checkPermission
1398      *         s.checkPermission} method with
1399      *         {@code RuntimePermission("accessDeclaredMembers")}
1400      *         denies access to the constructors within the enclosing class
1401      *
1402      *         <li> the caller's class loader is not the same as or an
1403      *         ancestor of the class loader for the enclosing class and
1404      *         invocation of {@link SecurityManager#checkPackageAccess
1405      *         s.checkPackageAccess()} denies access to the package
1406      *         of the enclosing class
1407      *
1408      *         </ul>
1409      * @since 1.5
1410      */
1411     @CallerSensitive
1412     public Constructor<?> getEnclosingConstructor() throws SecurityException {
1413         EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1414 
1415         if (enclosingInfo == null)
1416             return null;
1417         else {
1418             if (!enclosingInfo.isConstructor())
1419                 return null;
1420 
1421             ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1422                                                                         getFactory());
1423             Type []    parameterTypes   = typeInfo.getParameterTypes();
1424             Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1425 
1426             // Convert Types to Classes; returned types *should*
1427             // be class objects since the methodDescriptor's used
1428             // don't have generics information
1429             for(int i = 0; i < parameterClasses.length; i++)
1430                 parameterClasses[i] = toClass(parameterTypes[i]);
1431 
1432             // Perform access check
1433             final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1434             SecurityManager sm = System.getSecurityManager();
1435             if (sm != null) {
1436                 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
1437                                                      Reflection.getCallerClass(), true);
1438             }
1439 
1440             Constructor<?>[] candidates = enclosingCandidate
1441                     .privateGetDeclaredConstructors(false);
1442             /*
1443              * Loop over all declared constructors; match number
1444              * of and type of parameters.
1445              */
1446             ReflectionFactory fact = getReflectionFactory();
1447             for (Constructor<?> c : candidates) {
1448                 if (arrayContentsEq(parameterClasses,
1449                                     fact.getExecutableSharedParameterTypes(c))) {
1450                     return fact.copyConstructor(c);
1451                 }
1452             }
1453 
1454             throw new InternalError("Enclosing constructor not found");
1455         }
1456     }
1457 
1458 
1459     /**
1460      * If the class or interface represented by this {@code Class} object
1461      * is a member of another class, returns the {@code Class} object
1462      * representing the class in which it was declared.  This method returns
1463      * null if this class or interface is not a member of any other class.  If
1464      * this {@code Class} object represents an array class, a primitive
1465      * type, or void,then this method returns null.
1466      *
1467      * @return the declaring class for this class
1468      * @throws SecurityException
1469      *         If a security manager, <i>s</i>, is present and the caller's
1470      *         class loader is not the same as or an ancestor of the class
1471      *         loader for the declaring class and invocation of {@link
1472      *         SecurityManager#checkPackageAccess s.checkPackageAccess()}
1473      *         denies access to the package of the declaring class
1474      * @since 1.1
1475      */
1476     @CallerSensitive
1477     public Class<?> getDeclaringClass() throws SecurityException {
1478         final Class<?> candidate = getDeclaringClass0();
1479 
1480         if (candidate != null) {
1481             SecurityManager sm = System.getSecurityManager();
1482             if (sm != null) {
1483                 candidate.checkPackageAccess(sm,
1484                     ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1485             }
1486         }
1487         return candidate;
1488     }
1489 
1490     private native Class<?> getDeclaringClass0();
1491 
1492 
1493     /**
1494      * Returns the immediately enclosing class of the underlying
1495      * class.  If the underlying class is a top level class this
1496      * method returns {@code null}.
1497      * @return the immediately enclosing class of the underlying class
1498      * @exception  SecurityException
1499      *             If a security manager, <i>s</i>, is present and the caller's
1500      *             class loader is not the same as or an ancestor of the class
1501      *             loader for the enclosing class and invocation of {@link
1502      *             SecurityManager#checkPackageAccess s.checkPackageAccess()}
1503      *             denies access to the package of the enclosing class
1504      * @since 1.5
1505      */
1506     @CallerSensitive
1507     public Class<?> getEnclosingClass() throws SecurityException {
1508         // There are five kinds of classes (or interfaces):
1509         // a) Top level classes
1510         // b) Nested classes (static member classes)
1511         // c) Inner classes (non-static member classes)
1512         // d) Local classes (named classes declared within a method)
1513         // e) Anonymous classes
1514 
1515 
1516         // JVM Spec 4.7.7: A class must have an EnclosingMethod
1517         // attribute if and only if it is a local class or an
1518         // anonymous class.
1519         EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1520         Class<?> enclosingCandidate;
1521 
1522         if (enclosingInfo == null) {
1523             // This is a top level or a nested class or an inner class (a, b, or c)
1524             enclosingCandidate = getDeclaringClass0();
1525         } else {
1526             Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1527             // This is a local class or an anonymous class (d or e)
1528             if (enclosingClass == this || enclosingClass == null)
1529                 throw new InternalError("Malformed enclosing method information");
1530             else
1531                 enclosingCandidate = enclosingClass;
1532         }
1533 
1534         if (enclosingCandidate != null) {
1535             SecurityManager sm = System.getSecurityManager();
1536             if (sm != null) {
1537                 enclosingCandidate.checkPackageAccess(sm,
1538                     ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1539             }
1540         }
1541         return enclosingCandidate;
1542     }
1543 
1544     /**
1545      * Returns the simple name of the underlying class as given in the
1546      * source code. Returns an empty string if the underlying class is
1547      * anonymous.
1548      *
1549      * <p>The simple name of an array is the simple name of the
1550      * component type with "[]" appended.  In particular the simple
1551      * name of an array whose component type is anonymous is "[]".
1552      *
1553      * @return the simple name of the underlying class
1554      * @since 1.5
1555      */
1556     public String getSimpleName() {
1557         ReflectionData<T> rd = reflectionData();
1558         String simpleName = rd.simpleName;
1559         if (simpleName == null) {
1560             rd.simpleName = simpleName = getSimpleName0();
1561         }
1562         return simpleName;
1563     }
1564 
1565     private String getSimpleName0() {
1566         if (isArray()) {
1567             return getComponentType().getSimpleName() + "[]";
1568         }
1569         String simpleName = getSimpleBinaryName();
1570         if (simpleName == null) { // top level class
1571             simpleName = getName();
1572             simpleName = simpleName.substring(simpleName.lastIndexOf('.') + 1); // strip the package name
1573         }
1574         return simpleName;
1575     }
1576 
1577     /**
1578      * Return an informative string for the name of this type.
1579      *
1580      * @return an informative string for the name of this type
1581      * @since 1.8
1582      */
1583     public String getTypeName() {
1584         if (isArray()) {
1585             try {
1586                 Class<?> cl = this;
1587                 int dimensions = 0;
1588                 do {
1589                     dimensions++;
1590                     cl = cl.getComponentType();
1591                 } while (cl.isArray());
1592                 StringBuilder sb = new StringBuilder();
1593                 sb.append(cl.getName());
1594                 for (int i = 0; i < dimensions; i++) {
1595                     sb.append("[]");
1596                 }
1597                 return sb.toString();
1598             } catch (Throwable e) { /*FALLTHRU*/ }
1599         }
1600         return getName();
1601     }
1602 
1603     /**
1604      * Returns the canonical name of the underlying class as
1605      * defined by the Java Language Specification.  Returns null if
1606      * the underlying class does not have a canonical name (i.e., if
1607      * it is a local or anonymous class or an array whose component
1608      * type does not have a canonical name).
1609      * @return the canonical name of the underlying class if it exists, and
1610      * {@code null} otherwise.
1611      * @since 1.5
1612      */
1613     public String getCanonicalName() {
1614         ReflectionData<T> rd = reflectionData();
1615         String canonicalName = rd.canonicalName;
1616         if (canonicalName == null) {
1617             rd.canonicalName = canonicalName = getCanonicalName0();
1618         }
1619         return canonicalName == ReflectionData.NULL_SENTINEL? null : canonicalName;
1620     }
1621 
1622     private String getCanonicalName0() {
1623         if (isArray()) {
1624             String canonicalName = getComponentType().getCanonicalName();
1625             if (canonicalName != null)
1626                 return canonicalName + "[]";
1627             else
1628                 return ReflectionData.NULL_SENTINEL;
1629         }
1630         if (isLocalOrAnonymousClass())
1631             return ReflectionData.NULL_SENTINEL;
1632         Class<?> enclosingClass = getEnclosingClass();
1633         if (enclosingClass == null) { // top level class
1634             return getName();
1635         } else {
1636             String enclosingName = enclosingClass.getCanonicalName();
1637             if (enclosingName == null)
1638                 return ReflectionData.NULL_SENTINEL;
1639             return enclosingName + "." + getSimpleName();
1640         }
1641     }
1642 
1643     /**
1644      * Returns {@code true} if and only if the underlying class
1645      * is an anonymous class.
1646      *
1647      * @return {@code true} if and only if this class is an anonymous class.
1648      * @since 1.5
1649      */
1650     public boolean isAnonymousClass() {
1651         return !isArray() && isLocalOrAnonymousClass() &&
1652                 getSimpleBinaryName0() == null;
1653     }
1654 
1655     /**
1656      * Returns {@code true} if and only if the underlying class
1657      * is a local class.
1658      *
1659      * @return {@code true} if and only if this class is a local class.
1660      * @since 1.5
1661      */
1662     public boolean isLocalClass() {
1663         return isLocalOrAnonymousClass() &&
1664                 (isArray() || getSimpleBinaryName0() != null);
1665     }
1666 
1667     /**
1668      * Returns {@code true} if and only if the underlying class
1669      * is a member class.
1670      *
1671      * @return {@code true} if and only if this class is a member class.
1672      * @since 1.5
1673      */
1674     public boolean isMemberClass() {
1675         return !isLocalOrAnonymousClass() && getDeclaringClass0() != null;
1676     }
1677 
1678     /**
1679      * Returns the "simple binary name" of the underlying class, i.e.,
1680      * the binary name without the leading enclosing class name.
1681      * Returns {@code null} if the underlying class is a top level
1682      * class.
1683      */
1684     private String getSimpleBinaryName() {
1685         if (isTopLevelClass())
1686             return null;
1687         String name = getSimpleBinaryName0();
1688         if (name == null) // anonymous class
1689             return "";
1690         return name;
1691     }
1692 
1693     private native String getSimpleBinaryName0();
1694 
1695     /**
1696      * Returns {@code true} if this is a top level class.  Returns {@code false}
1697      * otherwise.
1698      */
1699     private boolean isTopLevelClass() {
1700         return !isLocalOrAnonymousClass() && getDeclaringClass0() == null;
1701     }
1702 
1703     /**
1704      * Returns {@code true} if this is a local class or an anonymous
1705      * class.  Returns {@code false} otherwise.
1706      */
1707     private boolean isLocalOrAnonymousClass() {
1708         // JVM Spec 4.7.7: A class must have an EnclosingMethod
1709         // attribute if and only if it is a local class or an
1710         // anonymous class.
1711         return hasEnclosingMethodInfo();
1712     }
1713 
1714     private boolean hasEnclosingMethodInfo() {
1715         Object[] enclosingInfo = getEnclosingMethod0();
1716         if (enclosingInfo != null) {
1717             EnclosingMethodInfo.validate(enclosingInfo);
1718             return true;
1719         }
1720         return false;
1721     }
1722 
1723     /**
1724      * Returns an array containing {@code Class} objects representing all
1725      * the public classes and interfaces that are members of the class
1726      * represented by this {@code Class} object.  This includes public
1727      * class and interface members inherited from superclasses and public class
1728      * and interface members declared by the class.  This method returns an
1729      * array of length 0 if this {@code Class} object has no public member
1730      * classes or interfaces.  This method also returns an array of length 0 if
1731      * this {@code Class} object represents a primitive type, an array
1732      * class, or void.
1733      *
1734      * @return the array of {@code Class} objects representing the public
1735      *         members of this class
1736      * @throws SecurityException
1737      *         If a security manager, <i>s</i>, is present and
1738      *         the caller's class loader is not the same as or an
1739      *         ancestor of the class loader for the current class and
1740      *         invocation of {@link SecurityManager#checkPackageAccess
1741      *         s.checkPackageAccess()} denies access to the package
1742      *         of this class.
1743      *
1744      * @since 1.1
1745      */
1746     @CallerSensitive
1747     public Class<?>[] getClasses() {
1748         SecurityManager sm = System.getSecurityManager();
1749         if (sm != null) {
1750             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
1751         }
1752 
1753         // Privileged so this implementation can look at DECLARED classes,
1754         // something the caller might not have privilege to do.  The code here
1755         // is allowed to look at DECLARED classes because (1) it does not hand
1756         // out anything other than public members and (2) public member access
1757         // has already been ok'd by the SecurityManager.
1758 
1759         return java.security.AccessController.doPrivileged(
1760             new java.security.PrivilegedAction<>() {
1761                 public Class<?>[] run() {
1762                     List<Class<?>> list = new ArrayList<>();
1763                     Class<?> currentClass = Class.this;
1764                     while (currentClass != null) {
1765                         for (Class<?> m : currentClass.getDeclaredClasses()) {
1766                             if (Modifier.isPublic(m.getModifiers())) {
1767                                 list.add(m);
1768                             }
1769                         }
1770                         currentClass = currentClass.getSuperclass();
1771                     }
1772                     return list.toArray(new Class<?>[0]);
1773                 }
1774             });
1775     }
1776 
1777 
1778     /**
1779      * Returns an array containing {@code Field} objects reflecting all
1780      * the accessible public fields of the class or interface represented by
1781      * this {@code Class} object.
1782      *
1783      * <p> If this {@code Class} object represents a class or interface with
1784      * no accessible public fields, then this method returns an array of length
1785      * 0.
1786      *
1787      * <p> If this {@code Class} object represents a class, then this method
1788      * returns the public fields of the class and of all its superclasses and
1789      * superinterfaces.
1790      *
1791      * <p> If this {@code Class} object represents an interface, then this
1792      * method returns the fields of the interface and of all its
1793      * superinterfaces.
1794      *
1795      * <p> If this {@code Class} object represents an array type, a primitive
1796      * type, or void, then this method returns an array of length 0.
1797      *
1798      * <p> The elements in the returned array are not sorted and are not in any
1799      * particular order.
1800      *
1801      * @return the array of {@code Field} objects representing the
1802      *         public fields
1803      * @throws SecurityException
1804      *         If a security manager, <i>s</i>, is present and
1805      *         the caller's class loader is not the same as or an
1806      *         ancestor of the class loader for the current class and
1807      *         invocation of {@link SecurityManager#checkPackageAccess
1808      *         s.checkPackageAccess()} denies access to the package
1809      *         of this class.
1810      *
1811      * @since 1.1
1812      * @jls 8.2 Class Members
1813      * @jls 8.3 Field Declarations
1814      */
1815     @CallerSensitive
1816     public Field[] getFields() throws SecurityException {
1817         SecurityManager sm = System.getSecurityManager();
1818         if (sm != null) {
1819             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1820         }
1821         return copyFields(privateGetPublicFields());
1822     }
1823 
1824 
1825     /**
1826      * Returns an array containing {@code Method} objects reflecting all the
1827      * public methods of the class or interface represented by this {@code
1828      * Class} object, including those declared by the class or interface and
1829      * those inherited from superclasses and superinterfaces.
1830      *
1831      * <p> If this {@code Class} object represents an array type, then the
1832      * returned array has a {@code Method} object for each of the public
1833      * methods inherited by the array type from {@code Object}. It does not
1834      * contain a {@code Method} object for {@code clone()}.
1835      *
1836      * <p> If this {@code Class} object represents an interface then the
1837      * returned array does not contain any implicitly declared methods from
1838      * {@code Object}. Therefore, if no methods are explicitly declared in
1839      * this interface or any of its superinterfaces then the returned array
1840      * has length 0. (Note that a {@code Class} object which represents a class
1841      * always has public methods, inherited from {@code Object}.)
1842      *
1843      * <p> The returned array never contains methods with names "{@code <init>}"
1844      * or "{@code <clinit>}".
1845      *
1846      * <p> The elements in the returned array are not sorted and are not in any
1847      * particular order.
1848      *
1849      * <p> Generally, the result is computed as with the following 4 step algorithm.
1850      * Let C be the class or interface represented by this {@code Class} object:
1851      * <ol>
1852      * <li> A union of methods is composed of:
1853      *   <ol type="a">
1854      *   <li> C's declared public instance and static methods as returned by
1855      *        {@link #getDeclaredMethods()} and filtered to include only public
1856      *        methods.</li>
1857      *   <li> If C is a class other than {@code Object}, then include the result
1858      *        of invoking this algorithm recursively on the superclass of C.</li>
1859      *   <li> Include the results of invoking this algorithm recursively on all
1860      *        direct superinterfaces of C, but include only instance methods.</li>
1861      *   </ol></li>
1862      * <li> Union from step 1 is partitioned into subsets of methods with same
1863      *      signature (name, parameter types) and return type.</li>
1864      * <li> Within each such subset only the most specific methods are selected.
1865      *      Let method M be a method from a set of methods with same signature
1866      *      and return type. M is most specific if there is no such method
1867      *      N != M from the same set, such that N is more specific than M.
1868      *      N is more specific than M if:
1869      *   <ol type="a">
1870      *   <li> N is declared by a class and M is declared by an interface; or</li>
1871      *   <li> N and M are both declared by classes or both by interfaces and
1872      *        N's declaring type is the same as or a subtype of M's declaring type
1873      *        (clearly, if M's and N's declaring types are the same type, then
1874      *        M and N are the same method).</li>
1875      *   </ol></li>
1876      * <li> The result of this algorithm is the union of all selected methods from
1877      *      step 3.</li>
1878      * </ol>
1879      *
1880      * @apiNote There may be more than one method with a particular name
1881      * and parameter types in a class because while the Java language forbids a
1882      * class to declare multiple methods with the same signature but different
1883      * return types, the Java virtual machine does not.  This
1884      * increased flexibility in the virtual machine can be used to
1885      * implement various language features.  For example, covariant
1886      * returns can be implemented with {@linkplain
1887      * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1888      * method and the overriding method would have the same
1889      * signature but different return types.
1890      *
1891      * @return the array of {@code Method} objects representing the
1892      *         public methods of this class
1893      * @throws SecurityException
1894      *         If a security manager, <i>s</i>, is present and
1895      *         the caller's class loader is not the same as or an
1896      *         ancestor of the class loader for the current class and
1897      *         invocation of {@link SecurityManager#checkPackageAccess
1898      *         s.checkPackageAccess()} denies access to the package
1899      *         of this class.
1900      *
1901      * @jls 8.2 Class Members
1902      * @jls 8.4 Method Declarations
1903      * @since 1.1
1904      */
1905     @CallerSensitive
1906     public Method[] getMethods() throws SecurityException {
1907         SecurityManager sm = System.getSecurityManager();
1908         if (sm != null) {
1909             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1910         }
1911         return copyMethods(privateGetPublicMethods());
1912     }
1913 
1914 
1915     /**
1916      * Returns an array containing {@code Constructor} objects reflecting
1917      * all the public constructors of the class represented by this
1918      * {@code Class} object.  An array of length 0 is returned if the
1919      * class has no public constructors, or if the class is an array class, or
1920      * if the class reflects a primitive type or void.
1921      *
1922      * Note that while this method returns an array of {@code
1923      * Constructor<T>} objects (that is an array of constructors from
1924      * this class), the return type of this method is {@code
1925      * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1926      * might be expected.  This less informative return type is
1927      * necessary since after being returned from this method, the
1928      * array could be modified to hold {@code Constructor} objects for
1929      * different classes, which would violate the type guarantees of
1930      * {@code Constructor<T>[]}.
1931      *
1932      * @return the array of {@code Constructor} objects representing the
1933      *         public constructors of this class
1934      * @throws SecurityException
1935      *         If a security manager, <i>s</i>, is present and
1936      *         the caller's class loader is not the same as or an
1937      *         ancestor of the class loader for the current class and
1938      *         invocation of {@link SecurityManager#checkPackageAccess
1939      *         s.checkPackageAccess()} denies access to the package
1940      *         of this class.
1941      *
1942      * @since 1.1
1943      */
1944     @CallerSensitive
1945     public Constructor<?>[] getConstructors() throws SecurityException {
1946         SecurityManager sm = System.getSecurityManager();
1947         if (sm != null) {
1948             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1949         }
1950         return copyConstructors(privateGetDeclaredConstructors(true));
1951     }
1952 
1953 
1954     /**
1955      * Returns a {@code Field} object that reflects the specified public member
1956      * field of the class or interface represented by this {@code Class}
1957      * object. The {@code name} parameter is a {@code String} specifying the
1958      * simple name of the desired field.
1959      *
1960      * <p> The field to be reflected is determined by the algorithm that
1961      * follows.  Let C be the class or interface represented by this object:
1962      *
1963      * <OL>
1964      * <LI> If C declares a public field with the name specified, that is the
1965      *      field to be reflected.</LI>
1966      * <LI> If no field was found in step 1 above, this algorithm is applied
1967      *      recursively to each direct superinterface of C. The direct
1968      *      superinterfaces are searched in the order they were declared.</LI>
1969      * <LI> If no field was found in steps 1 and 2 above, and C has a
1970      *      superclass S, then this algorithm is invoked recursively upon S.
1971      *      If C has no superclass, then a {@code NoSuchFieldException}
1972      *      is thrown.</LI>
1973      * </OL>
1974      *
1975      * <p> If this {@code Class} object represents an array type, then this
1976      * method does not find the {@code length} field of the array type.
1977      *
1978      * @param name the field name
1979      * @return the {@code Field} object of this class specified by
1980      *         {@code name}
1981      * @throws NoSuchFieldException if a field with the specified name is
1982      *         not found.
1983      * @throws NullPointerException if {@code name} is {@code null}
1984      * @throws SecurityException
1985      *         If a security manager, <i>s</i>, is present and
1986      *         the caller's class loader is not the same as or an
1987      *         ancestor of the class loader for the current class and
1988      *         invocation of {@link SecurityManager#checkPackageAccess
1989      *         s.checkPackageAccess()} denies access to the package
1990      *         of this class.
1991      *
1992      * @since 1.1
1993      * @jls 8.2 Class Members
1994      * @jls 8.3 Field Declarations
1995      */
1996     @CallerSensitive
1997     public Field getField(String name)
1998         throws NoSuchFieldException, SecurityException {
1999         Objects.requireNonNull(name);
2000         SecurityManager sm = System.getSecurityManager();
2001         if (sm != null) {
2002             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
2003         }
2004         Field field = getField0(name);
2005         if (field == null) {
2006             throw new NoSuchFieldException(name);
2007         }
2008         return getReflectionFactory().copyField(field);
2009     }
2010 
2011 
2012     /**
2013      * Returns a {@code Method} object that reflects the specified public
2014      * member method of the class or interface represented by this
2015      * {@code Class} object. The {@code name} parameter is a
2016      * {@code String} specifying the simple name of the desired method. The
2017      * {@code parameterTypes} parameter is an array of {@code Class}
2018      * objects that identify the method's formal parameter types, in declared
2019      * order. If {@code parameterTypes} is {@code null}, it is
2020      * treated as if it were an empty array.
2021      *
2022      * <p> If this {@code Class} object represents an array type, then this
2023      * method finds any public method inherited by the array type from
2024      * {@code Object} except method {@code clone()}.
2025      *
2026      * <p> If this {@code Class} object represents an interface then this
2027      * method does not find any implicitly declared method from
2028      * {@code Object}. Therefore, if no methods are explicitly declared in
2029      * this interface or any of its superinterfaces, then this method does not
2030      * find any method.
2031      *
2032      * <p> This method does not find any method with name "{@code <init>}" or
2033      * "{@code <clinit>}".
2034      *
2035      * <p> Generally, the method to be reflected is determined by the 4 step
2036      * algorithm that follows.
2037      * Let C be the class or interface represented by this {@code Class} object:
2038      * <ol>
2039      * <li> A union of methods is composed of:
2040      *   <ol type="a">
2041      *   <li> C's declared public instance and static methods as returned by
2042      *        {@link #getDeclaredMethods()} and filtered to include only public
2043      *        methods that match given {@code name} and {@code parameterTypes}</li>
2044      *   <li> If C is a class other than {@code Object}, then include the result
2045      *        of invoking this algorithm recursively on the superclass of C.</li>
2046      *   <li> Include the results of invoking this algorithm recursively on all
2047      *        direct superinterfaces of C, but include only instance methods.</li>
2048      *   </ol></li>
2049      * <li> This union is partitioned into subsets of methods with same
2050      *      return type (the selection of methods from step 1 also guarantees that
2051      *      they have the same method name and parameter types).</li>
2052      * <li> Within each such subset only the most specific methods are selected.
2053      *      Let method M be a method from a set of methods with same VM
2054      *      signature (return type, name, parameter types).
2055      *      M is most specific if there is no such method N != M from the same
2056      *      set, such that N is more specific than M. N is more specific than M
2057      *      if:
2058      *   <ol type="a">
2059      *   <li> N is declared by a class and M is declared by an interface; or</li>
2060      *   <li> N and M are both declared by classes or both by interfaces and
2061      *        N's declaring type is the same as or a subtype of M's declaring type
2062      *        (clearly, if M's and N's declaring types are the same type, then
2063      *        M and N are the same method).</li>
2064      *   </ol></li>
2065      * <li> The result of this algorithm is chosen arbitrarily from the methods
2066      *      with most specific return type among all selected methods from step 3.
2067      *      Let R be a return type of a method M from the set of all selected methods
2068      *      from step 3. M is a method with most specific return type if there is
2069      *      no such method N != M from the same set, having return type S != R,
2070      *      such that S is a subtype of R as determined by
2071      *      R.class.{@link #isAssignableFrom}(S.class).
2072      * </ol>
2073      *
2074      * @apiNote There may be more than one method with matching name and
2075      * parameter types in a class because while the Java language forbids a
2076      * class to declare multiple methods with the same signature but different
2077      * return types, the Java virtual machine does not.  This
2078      * increased flexibility in the virtual machine can be used to
2079      * implement various language features.  For example, covariant
2080      * returns can be implemented with {@linkplain
2081      * java.lang.reflect.Method#isBridge bridge methods}; the bridge
2082      * method and the overriding method would have the same
2083      * signature but different return types. This method would return the
2084      * overriding method as it would have a more specific return type.
2085      *
2086      * @param name the name of the method
2087      * @param parameterTypes the list of parameters
2088      * @return the {@code Method} object that matches the specified
2089      *         {@code name} and {@code parameterTypes}
2090      * @throws NoSuchMethodException if a matching method is not found
2091      *         or if the name is "&lt;init&gt;"or "&lt;clinit&gt;".
2092      * @throws NullPointerException if {@code name} is {@code null}
2093      * @throws SecurityException
2094      *         If a security manager, <i>s</i>, is present and
2095      *         the caller's class loader is not the same as or an
2096      *         ancestor of the class loader for the current class and
2097      *         invocation of {@link SecurityManager#checkPackageAccess
2098      *         s.checkPackageAccess()} denies access to the package
2099      *         of this class.
2100      *
2101      * @jls 8.2 Class Members
2102      * @jls 8.4 Method Declarations
2103      * @since 1.1
2104      */
2105     @CallerSensitive
2106     public Method getMethod(String name, Class<?>... parameterTypes)
2107         throws NoSuchMethodException, SecurityException {
2108         Objects.requireNonNull(name);
2109         SecurityManager sm = System.getSecurityManager();
2110         if (sm != null) {
2111             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
2112         }
2113         Method method = getMethod0(name, parameterTypes);
2114         if (method == null) {
2115             throw new NoSuchMethodException(methodToString(name, parameterTypes));
2116         }
2117         return getReflectionFactory().copyMethod(method);
2118     }
2119 
2120     /**
2121      * Returns a {@code Constructor} object that reflects the specified
2122      * public constructor of the class represented by this {@code Class}
2123      * object. The {@code parameterTypes} parameter is an array of
2124      * {@code Class} objects that identify the constructor's formal
2125      * parameter types, in declared order.
2126      *
2127      * If this {@code Class} object represents an inner class
2128      * declared in a non-static context, the formal parameter types
2129      * include the explicit enclosing instance as the first parameter.
2130      *
2131      * <p> The constructor to reflect is the public constructor of the class
2132      * represented by this {@code Class} object whose formal parameter
2133      * types match those specified by {@code parameterTypes}.
2134      *
2135      * @param parameterTypes the parameter array
2136      * @return the {@code Constructor} object of the public constructor that
2137      *         matches the specified {@code parameterTypes}
2138      * @throws NoSuchMethodException if a matching method is not found.
2139      * @throws SecurityException
2140      *         If a security manager, <i>s</i>, is present and
2141      *         the caller's class loader is not the same as or an
2142      *         ancestor of the class loader for the current class and
2143      *         invocation of {@link SecurityManager#checkPackageAccess
2144      *         s.checkPackageAccess()} denies access to the package
2145      *         of this class.
2146      *
2147      * @since 1.1
2148      */
2149     @CallerSensitive
2150     public Constructor<T> getConstructor(Class<?>... parameterTypes)
2151         throws NoSuchMethodException, SecurityException
2152     {
2153         SecurityManager sm = System.getSecurityManager();
2154         if (sm != null) {
2155             checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
2156         }
2157         return getReflectionFactory().copyConstructor(
2158             getConstructor0(parameterTypes, Member.PUBLIC));
2159     }
2160 
2161 
2162     /**
2163      * Returns an array of {@code Class} objects reflecting all the
2164      * classes and interfaces declared as members of the class represented by
2165      * this {@code Class} object. This includes public, protected, default
2166      * (package) access, and private classes and interfaces declared by the
2167      * class, but excludes inherited classes and interfaces.  This method
2168      * returns an array of length 0 if the class declares no classes or
2169      * interfaces as members, or if this {@code Class} object represents a
2170      * primitive type, an array class, or void.
2171      *
2172      * @return the array of {@code Class} objects representing all the
2173      *         declared members of this class
2174      * @throws SecurityException
2175      *         If a security manager, <i>s</i>, is present and any of the
2176      *         following conditions is met:
2177      *
2178      *         <ul>
2179      *
2180      *         <li> the caller's class loader is not the same as the
2181      *         class loader of this class and invocation of
2182      *         {@link SecurityManager#checkPermission
2183      *         s.checkPermission} method with
2184      *         {@code RuntimePermission("accessDeclaredMembers")}
2185      *         denies access to the declared classes within this class
2186      *
2187      *         <li> the caller's class loader is not the same as or an
2188      *         ancestor of the class loader for the current class and
2189      *         invocation of {@link SecurityManager#checkPackageAccess
2190      *         s.checkPackageAccess()} denies access to the package
2191      *         of this class
2192      *
2193      *         </ul>
2194      *
2195      * @since 1.1
2196      */
2197     @CallerSensitive
2198     public Class<?>[] getDeclaredClasses() throws SecurityException {
2199         SecurityManager sm = System.getSecurityManager();
2200         if (sm != null) {
2201             checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), false);
2202         }
2203         return getDeclaredClasses0();
2204     }
2205 
2206 
2207     /**
2208      * Returns an array of {@code Field} objects reflecting all the fields
2209      * declared by the class or interface represented by this
2210      * {@code Class} object. This includes public, protected, default
2211      * (package) access, and private fields, but excludes inherited fields.
2212      *
2213      * <p> If this {@code Class} object represents a class or interface with no
2214      * declared fields, then this method returns an array of length 0.
2215      *
2216      * <p> If this {@code Class} object represents an array type, a primitive
2217      * type, or void, then this method returns an array of length 0.
2218      *
2219      * <p> The elements in the returned array are not sorted and are not in any
2220      * particular order.
2221      *
2222      * @return  the array of {@code Field} objects representing all the
2223      *          declared fields of this class
2224      * @throws  SecurityException
2225      *          If a security manager, <i>s</i>, is present and any of the
2226      *          following conditions is met:
2227      *
2228      *          <ul>
2229      *
2230      *          <li> the caller's class loader is not the same as the
2231      *          class loader of this class and invocation of
2232      *          {@link SecurityManager#checkPermission
2233      *          s.checkPermission} method with
2234      *          {@code RuntimePermission("accessDeclaredMembers")}
2235      *          denies access to the declared fields within this class
2236      *
2237      *          <li> the caller's class loader is not the same as or an
2238      *          ancestor of the class loader for the current class and
2239      *          invocation of {@link SecurityManager#checkPackageAccess
2240      *          s.checkPackageAccess()} denies access to the package
2241      *          of this class
2242      *
2243      *          </ul>
2244      *
2245      * @since 1.1
2246      * @jls 8.2 Class Members
2247      * @jls 8.3 Field Declarations
2248      */
2249     @CallerSensitive
2250     public Field[] getDeclaredFields() throws SecurityException {
2251         SecurityManager sm = System.getSecurityManager();
2252         if (sm != null) {
2253             checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2254         }
2255         return copyFields(privateGetDeclaredFields(false));
2256     }
2257 
2258 
2259     /**
2260      * Returns an array containing {@code Method} objects reflecting all the
2261      * declared methods of the class or interface represented by this {@code
2262      * Class} object, including public, protected, default (package)
2263      * access, and private methods, but excluding inherited methods.
2264      *
2265      * <p> If this {@code Class} object represents a type that has multiple
2266      * declared methods with the same name and parameter types, but different
2267      * return types, then the returned array has a {@code Method} object for
2268      * each such method.
2269      *
2270      * <p> If this {@code Class} object represents a type that has a class
2271      * initialization method {@code <clinit>}, then the returned array does
2272      * <em>not</em> have a corresponding {@code Method} object.
2273      *
2274      * <p> If this {@code Class} object represents a class or interface with no
2275      * declared methods, then the returned array has length 0.
2276      *
2277      * <p> If this {@code Class} object represents an array type, a primitive
2278      * type, or void, then the returned array has length 0.
2279      *
2280      * <p> The elements in the returned array are not sorted and are not in any
2281      * particular order.
2282      *
2283      * @return  the array of {@code Method} objects representing all the
2284      *          declared methods of this class
2285      * @throws  SecurityException
2286      *          If a security manager, <i>s</i>, is present and any of the
2287      *          following conditions is met:
2288      *
2289      *          <ul>
2290      *
2291      *          <li> the caller's class loader is not the same as the
2292      *          class loader of this class and invocation of
2293      *          {@link SecurityManager#checkPermission
2294      *          s.checkPermission} method with
2295      *          {@code RuntimePermission("accessDeclaredMembers")}
2296      *          denies access to the declared methods within this class
2297      *
2298      *          <li> the caller's class loader is not the same as or an
2299      *          ancestor of the class loader for the current class and
2300      *          invocation of {@link SecurityManager#checkPackageAccess
2301      *          s.checkPackageAccess()} denies access to the package
2302      *          of this class
2303      *
2304      *          </ul>
2305      *
2306      * @jls 8.2 Class Members
2307      * @jls 8.4 Method Declarations
2308      * @since 1.1
2309      */
2310     @CallerSensitive
2311     public Method[] getDeclaredMethods() throws SecurityException {
2312         SecurityManager sm = System.getSecurityManager();
2313         if (sm != null) {
2314             checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2315         }
2316         return copyMethods(privateGetDeclaredMethods(false));
2317     }
2318 
2319 
2320     /**
2321      * Returns an array of {@code Constructor} objects reflecting all the
2322      * constructors declared by the class represented by this
2323      * {@code Class} object. These are public, protected, default
2324      * (package) access, and private constructors.  The elements in the array
2325      * returned are not sorted and are not in any particular order.  If the
2326      * class has a default constructor, it is included in the returned array.
2327      * This method returns an array of length 0 if this {@code Class}
2328      * object represents an interface, a primitive type, an array class, or
2329      * void.
2330      *
2331      * <p> See <em>The Java Language Specification</em>, section 8.2.
2332      *
2333      * @return  the array of {@code Constructor} objects representing all the
2334      *          declared constructors of this class
2335      * @throws  SecurityException
2336      *          If a security manager, <i>s</i>, is present and any of the
2337      *          following conditions is met:
2338      *
2339      *          <ul>
2340      *
2341      *          <li> the caller's class loader is not the same as the
2342      *          class loader of this class and invocation of
2343      *          {@link SecurityManager#checkPermission
2344      *          s.checkPermission} method with
2345      *          {@code RuntimePermission("accessDeclaredMembers")}
2346      *          denies access to the declared constructors within this class
2347      *
2348      *          <li> the caller's class loader is not the same as or an
2349      *          ancestor of the class loader for the current class and
2350      *          invocation of {@link SecurityManager#checkPackageAccess
2351      *          s.checkPackageAccess()} denies access to the package
2352      *          of this class
2353      *
2354      *          </ul>
2355      *
2356      * @since 1.1
2357      */
2358     @CallerSensitive
2359     public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
2360         SecurityManager sm = System.getSecurityManager();
2361         if (sm != null) {
2362             checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2363         }
2364         return copyConstructors(privateGetDeclaredConstructors(false));
2365     }
2366 
2367 
2368     /**
2369      * Returns a {@code Field} object that reflects the specified declared
2370      * field of the class or interface represented by this {@code Class}
2371      * object. The {@code name} parameter is a {@code String} that specifies
2372      * the simple name of the desired field.
2373      *
2374      * <p> If this {@code Class} object represents an array type, then this
2375      * method does not find the {@code length} field of the array type.
2376      *
2377      * @param name the name of the field
2378      * @return  the {@code Field} object for the specified field in this
2379      *          class
2380      * @throws  NoSuchFieldException if a field with the specified name is
2381      *          not found.
2382      * @throws  NullPointerException if {@code name} is {@code null}
2383      * @throws  SecurityException
2384      *          If a security manager, <i>s</i>, is present and any of the
2385      *          following conditions is met:
2386      *
2387      *          <ul>
2388      *
2389      *          <li> the caller's class loader is not the same as the
2390      *          class loader of this class and invocation of
2391      *          {@link SecurityManager#checkPermission
2392      *          s.checkPermission} method with
2393      *          {@code RuntimePermission("accessDeclaredMembers")}
2394      *          denies access to the declared field
2395      *
2396      *          <li> the caller's class loader is not the same as or an
2397      *          ancestor of the class loader for the current class and
2398      *          invocation of {@link SecurityManager#checkPackageAccess
2399      *          s.checkPackageAccess()} denies access to the package
2400      *          of this class
2401      *
2402      *          </ul>
2403      *
2404      * @since 1.1
2405      * @jls 8.2 Class Members
2406      * @jls 8.3 Field Declarations
2407      */
2408     @CallerSensitive
2409     public Field getDeclaredField(String name)
2410         throws NoSuchFieldException, SecurityException {
2411         Objects.requireNonNull(name);
2412         SecurityManager sm = System.getSecurityManager();
2413         if (sm != null) {
2414             checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2415         }
2416         Field field = searchFields(privateGetDeclaredFields(false), name);
2417         if (field == null) {
2418             throw new NoSuchFieldException(name);
2419         }
2420         return getReflectionFactory().copyField(field);
2421     }
2422 
2423 
2424     /**
2425      * Returns a {@code Method} object that reflects the specified
2426      * declared method of the class or interface represented by this
2427      * {@code Class} object. The {@code name} parameter is a
2428      * {@code String} that specifies the simple name of the desired
2429      * method, and the {@code parameterTypes} parameter is an array of
2430      * {@code Class} objects that identify the method's formal parameter
2431      * types, in declared order.  If more than one method with the same
2432      * parameter types is declared in a class, and one of these methods has a
2433      * return type that is more specific than any of the others, that method is
2434      * returned; otherwise one of the methods is chosen arbitrarily.  If the
2435      * name is "&lt;init&gt;"or "&lt;clinit&gt;" a {@code NoSuchMethodException}
2436      * is raised.
2437      *
2438      * <p> If this {@code Class} object represents an array type, then this
2439      * method does not find the {@code clone()} method.
2440      *
2441      * @param name the name of the method
2442      * @param parameterTypes the parameter array
2443      * @return  the {@code Method} object for the method of this class
2444      *          matching the specified name and parameters
2445      * @throws  NoSuchMethodException if a matching method is not found.
2446      * @throws  NullPointerException if {@code name} is {@code null}
2447      * @throws  SecurityException
2448      *          If a security manager, <i>s</i>, is present and any of the
2449      *          following conditions is met:
2450      *
2451      *          <ul>
2452      *
2453      *          <li> the caller's class loader is not the same as the
2454      *          class loader of this class and invocation of
2455      *          {@link SecurityManager#checkPermission
2456      *          s.checkPermission} method with
2457      *          {@code RuntimePermission("accessDeclaredMembers")}
2458      *          denies access to the declared method
2459      *
2460      *          <li> the caller's class loader is not the same as or an
2461      *          ancestor of the class loader for the current class and
2462      *          invocation of {@link SecurityManager#checkPackageAccess
2463      *          s.checkPackageAccess()} denies access to the package
2464      *          of this class
2465      *
2466      *          </ul>
2467      *
2468      * @jls 8.2 Class Members
2469      * @jls 8.4 Method Declarations
2470      * @since 1.1
2471      */
2472     @CallerSensitive
2473     public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
2474         throws NoSuchMethodException, SecurityException {
2475         Objects.requireNonNull(name);
2476         SecurityManager sm = System.getSecurityManager();
2477         if (sm != null) {
2478             checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2479         }
2480         Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
2481         if (method == null) {
2482             throw new NoSuchMethodException(methodToString(name, parameterTypes));
2483         }
2484         return getReflectionFactory().copyMethod(method);
2485     }
2486 
2487     /**
2488      * Returns the list of {@code Method} objects for the declared public
2489      * methods of this class or interface that have the specified method name
2490      * and parameter types.
2491      *
2492      * @param name the name of the method
2493      * @param parameterTypes the parameter array
2494      * @return the list of {@code Method} objects for the public methods of
2495      *         this class matching the specified name and parameters
2496      */
2497     List<Method> getDeclaredPublicMethods(String name, Class<?>... parameterTypes) {
2498         Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
2499         ReflectionFactory factory = getReflectionFactory();
2500         List<Method> result = new ArrayList<>();
2501         for (Method method : methods) {
2502             if (method.getName().equals(name)
2503                 && Arrays.equals(
2504                     factory.getExecutableSharedParameterTypes(method),
2505                     parameterTypes)) {
2506                 result.add(factory.copyMethod(method));
2507             }
2508         }
2509         return result;
2510     }
2511 
2512     /**
2513      * Returns a {@code Constructor} object that reflects the specified
2514      * constructor of the class or interface represented by this
2515      * {@code Class} object.  The {@code parameterTypes} parameter is
2516      * an array of {@code Class} objects that identify the constructor's
2517      * formal parameter types, in declared order.
2518      *
2519      * If this {@code Class} object represents an inner class
2520      * declared in a non-static context, the formal parameter types
2521      * include the explicit enclosing instance as the first parameter.
2522      *
2523      * @param parameterTypes the parameter array
2524      * @return  The {@code Constructor} object for the constructor with the
2525      *          specified parameter list
2526      * @throws  NoSuchMethodException if a matching method is not found.
2527      * @throws  SecurityException
2528      *          If a security manager, <i>s</i>, is present and any of the
2529      *          following conditions is met:
2530      *
2531      *          <ul>
2532      *
2533      *          <li> the caller's class loader is not the same as the
2534      *          class loader of this class and invocation of
2535      *          {@link SecurityManager#checkPermission
2536      *          s.checkPermission} method with
2537      *          {@code RuntimePermission("accessDeclaredMembers")}
2538      *          denies access to the declared constructor
2539      *
2540      *          <li> the caller's class loader is not the same as or an
2541      *          ancestor of the class loader for the current class and
2542      *          invocation of {@link SecurityManager#checkPackageAccess
2543      *          s.checkPackageAccess()} denies access to the package
2544      *          of this class
2545      *
2546      *          </ul>
2547      *
2548      * @since 1.1
2549      */
2550     @CallerSensitive
2551     public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
2552         throws NoSuchMethodException, SecurityException
2553     {
2554         SecurityManager sm = System.getSecurityManager();
2555         if (sm != null) {
2556             checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2557         }
2558 
2559         return getReflectionFactory().copyConstructor(
2560             getConstructor0(parameterTypes, Member.DECLARED));
2561     }
2562 
2563     /**
2564      * Finds a resource with a given name.
2565      *
2566      * <p> If this class is in a named {@link Module Module} then this method
2567      * will attempt to find the resource in the module. This is done by
2568      * delegating to the module's class loader {@link
2569      * ClassLoader#findResource(String,String) findResource(String,String)}
2570      * method, invoking it with the module name and the absolute name of the
2571      * resource. Resources in named modules are subject to the rules for
2572      * encapsulation specified in the {@code Module} {@link
2573      * Module#getResourceAsStream getResourceAsStream} method and so this
2574      * method returns {@code null} when the resource is a
2575      * non-"{@code .class}" resource in a package that is not open to the
2576      * caller's module.
2577      *
2578      * <p> Otherwise, if this class is not in a named module then the rules for
2579      * searching resources associated with a given class are implemented by the
2580      * defining {@linkplain ClassLoader class loader} of the class.  This method
2581      * delegates to this object's class loader.  If this object was loaded by
2582      * the bootstrap class loader, the method delegates to {@link
2583      * ClassLoader#getSystemResourceAsStream}.
2584      *
2585      * <p> Before delegation, an absolute resource name is constructed from the
2586      * given resource name using this algorithm:
2587      *
2588      * <ul>
2589      *
2590      * <li> If the {@code name} begins with a {@code '/'}
2591      * (<code>'\u002f'</code>), then the absolute name of the resource is the
2592      * portion of the {@code name} following the {@code '/'}.
2593      *
2594      * <li> Otherwise, the absolute name is of the following form:
2595      *
2596      * <blockquote>
2597      *   {@code modified_package_name/name}
2598      * </blockquote>
2599      *
2600      * <p> Where the {@code modified_package_name} is the package name of this
2601      * object with {@code '/'} substituted for {@code '.'}
2602      * (<code>'\u002e'</code>).
2603      *
2604      * </ul>
2605      *
2606      * @param  name name of the desired resource
2607      * @return  A {@link java.io.InputStream} object; {@code null} if no
2608      *          resource with this name is found, the resource is in a package
2609      *          that is not {@linkplain Module#isOpen(String, Module) open} to at
2610      *          least the caller module, or access to the resource is denied
2611      *          by the security manager.
2612      * @throws  NullPointerException If {@code name} is {@code null}
2613      *
2614      * @see Module#getResourceAsStream(String)
2615      * @since  1.1
2616      * @revised 9
2617      * @spec JPMS
2618      */
2619     @CallerSensitive
2620     public InputStream getResourceAsStream(String name) {
2621         name = resolveName(name);
2622 
2623         Module thisModule = getModule();
2624         if (thisModule.isNamed()) {
2625             // check if resource can be located by caller
2626             if (Resources.canEncapsulate(name)
2627                 && !isOpenToCaller(name, Reflection.getCallerClass())) {
2628                 return null;
2629             }
2630 
2631             // resource not encapsulated or in package open to caller
2632             String mn = thisModule.getName();
2633             ClassLoader cl = getClassLoader0();
2634             try {
2635 
2636                 // special-case built-in class loaders to avoid the
2637                 // need for a URL connection
2638                 if (cl == null) {
2639                     return BootLoader.findResourceAsStream(mn, name);
2640                 } else if (cl instanceof BuiltinClassLoader) {
2641                     return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name);
2642                 } else {
2643                     URL url = cl.findResource(mn, name);
2644                     return (url != null) ? url.openStream() : null;
2645                 }
2646 
2647             } catch (IOException | SecurityException e) {
2648                 return null;
2649             }
2650         }
2651 
2652         // unnamed module
2653         ClassLoader cl = getClassLoader0();
2654         if (cl == null) {
2655             return ClassLoader.getSystemResourceAsStream(name);
2656         } else {
2657             return cl.getResourceAsStream(name);
2658         }
2659     }
2660 
2661     /**
2662      * Finds a resource with a given name.
2663      *
2664      * <p> If this class is in a named {@link Module Module} then this method
2665      * will attempt to find the resource in the module. This is done by
2666      * delegating to the module's class loader {@link
2667      * ClassLoader#findResource(String,String) findResource(String,String)}
2668      * method, invoking it with the module name and the absolute name of the
2669      * resource. Resources in named modules are subject to the rules for
2670      * encapsulation specified in the {@code Module} {@link
2671      * Module#getResourceAsStream getResourceAsStream} method and so this
2672      * method returns {@code null} when the resource is a
2673      * non-"{@code .class}" resource in a package that is not open to the
2674      * caller's module.
2675      *
2676      * <p> Otherwise, if this class is not in a named module then the rules for
2677      * searching resources associated with a given class are implemented by the
2678      * defining {@linkplain ClassLoader class loader} of the class.  This method
2679      * delegates to this object's class loader. If this object was loaded by
2680      * the bootstrap class loader, the method delegates to {@link
2681      * ClassLoader#getSystemResource}.
2682      *
2683      * <p> Before delegation, an absolute resource name is constructed from the
2684      * given resource name using this algorithm:
2685      *
2686      * <ul>
2687      *
2688      * <li> If the {@code name} begins with a {@code '/'}
2689      * (<code>'\u002f'</code>), then the absolute name of the resource is the
2690      * portion of the {@code name} following the {@code '/'}.
2691      *
2692      * <li> Otherwise, the absolute name is of the following form:
2693      *
2694      * <blockquote>
2695      *   {@code modified_package_name/name}
2696      * </blockquote>
2697      *
2698      * <p> Where the {@code modified_package_name} is the package name of this
2699      * object with {@code '/'} substituted for {@code '.'}
2700      * (<code>'\u002e'</code>).
2701      *
2702      * </ul>
2703      *
2704      * @param  name name of the desired resource
2705      * @return A {@link java.net.URL} object; {@code null} if no resource with
2706      *         this name is found, the resource cannot be located by a URL, the
2707      *         resource is in a package that is not
2708      *         {@linkplain Module#isOpen(String, Module) open} to at least the caller
2709      *         module, or access to the resource is denied by the security
2710      *         manager.
2711      * @throws NullPointerException If {@code name} is {@code null}
2712      * @since  1.1
2713      * @revised 9
2714      * @spec JPMS
2715      */
2716     @CallerSensitive
2717     public URL getResource(String name) {
2718         name = resolveName(name);
2719 
2720         Module thisModule = getModule();
2721         if (thisModule.isNamed()) {
2722             // check if resource can be located by caller
2723             if (Resources.canEncapsulate(name)
2724                 && !isOpenToCaller(name, Reflection.getCallerClass())) {
2725                 return null;
2726             }
2727 
2728             // resource not encapsulated or in package open to caller
2729             String mn = thisModule.getName();
2730             ClassLoader cl = getClassLoader0();
2731             try {
2732                 if (cl == null) {
2733                     return BootLoader.findResource(mn, name);
2734                 } else {
2735                     return cl.findResource(mn, name);
2736                 }
2737             } catch (IOException ioe) {
2738                 return null;
2739             }
2740         }
2741 
2742         // unnamed module
2743         ClassLoader cl = getClassLoader0();
2744         if (cl == null) {
2745             return ClassLoader.getSystemResource(name);
2746         } else {
2747             return cl.getResource(name);
2748         }
2749     }
2750 
2751     /**
2752      * Returns true if a resource with the given name can be located by the
2753      * given caller. All resources in a module can be located by code in
2754      * the module. For other callers, then the package needs to be open to
2755      * the caller.
2756      */
2757     private boolean isOpenToCaller(String name, Class<?> caller) {
2758         // assert getModule().isNamed();
2759         Module thisModule = getModule();
2760         Module callerModule = (caller != null) ? caller.getModule() : null;
2761         if (callerModule != thisModule) {
2762             String pn = Resources.toPackageName(name);
2763             if (thisModule.getDescriptor().packages().contains(pn)) {
2764                 if (callerModule == null && !thisModule.isOpen(pn)) {
2765                     // no caller, package not open
2766                     return false;
2767                 }
2768                 if (!thisModule.isOpen(pn, callerModule)) {
2769                     // package not open to caller
2770                     return false;
2771                 }
2772             }
2773         }
2774         return true;
2775     }
2776 
2777 
2778     /** protection domain returned when the internal domain is null */
2779     private static java.security.ProtectionDomain allPermDomain;
2780 
2781     /**
2782      * Returns the {@code ProtectionDomain} of this class.  If there is a
2783      * security manager installed, this method first calls the security
2784      * manager's {@code checkPermission} method with a
2785      * {@code RuntimePermission("getProtectionDomain")} permission to
2786      * ensure it's ok to get the
2787      * {@code ProtectionDomain}.
2788      *
2789      * @return the ProtectionDomain of this class
2790      *
2791      * @throws SecurityException
2792      *        if a security manager exists and its
2793      *        {@code checkPermission} method doesn't allow
2794      *        getting the ProtectionDomain.
2795      *
2796      * @see java.security.ProtectionDomain
2797      * @see SecurityManager#checkPermission
2798      * @see java.lang.RuntimePermission
2799      * @since 1.2
2800      */
2801     public java.security.ProtectionDomain getProtectionDomain() {
2802         SecurityManager sm = System.getSecurityManager();
2803         if (sm != null) {
2804             sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2805         }
2806         java.security.ProtectionDomain pd = getProtectionDomain0();
2807         if (pd == null) {
2808             if (allPermDomain == null) {
2809                 java.security.Permissions perms =
2810                     new java.security.Permissions();
2811                 perms.add(SecurityConstants.ALL_PERMISSION);
2812                 allPermDomain =
2813                     new java.security.ProtectionDomain(null, perms);
2814             }
2815             pd = allPermDomain;
2816         }
2817         return pd;
2818     }
2819 
2820 
2821     /**
2822      * Returns the ProtectionDomain of this class.
2823      */
2824     private native java.security.ProtectionDomain getProtectionDomain0();
2825 
2826     /*
2827      * Return the Virtual Machine's Class object for the named
2828      * primitive type.
2829      */
2830     static native Class<?> getPrimitiveClass(String name);
2831 
2832     /*
2833      * Check if client is allowed to access members.  If access is denied,
2834      * throw a SecurityException.
2835      *
2836      * This method also enforces package access.
2837      *
2838      * <p> Default policy: allow all clients access with normal Java access
2839      * control.
2840      *
2841      * <p> NOTE: should only be called if a SecurityManager is installed
2842      */
2843     private void checkMemberAccess(SecurityManager sm, int which,
2844                                    Class<?> caller, boolean checkProxyInterfaces) {
2845         /* Default policy allows access to all {@link Member#PUBLIC} members,
2846          * as well as access to classes that have the same class loader as the caller.
2847          * In all other cases, it requires RuntimePermission("accessDeclaredMembers")
2848          * permission.
2849          */
2850         final ClassLoader ccl = ClassLoader.getClassLoader(caller);
2851         if (which != Member.PUBLIC) {
2852             final ClassLoader cl = getClassLoader0();
2853             if (ccl != cl) {
2854                 sm.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
2855             }
2856         }
2857         this.checkPackageAccess(sm, ccl, checkProxyInterfaces);
2858     }
2859 
2860     /*
2861      * Checks if a client loaded in ClassLoader ccl is allowed to access this
2862      * class under the current package access policy. If access is denied,
2863      * throw a SecurityException.
2864      *
2865      * NOTE: this method should only be called if a SecurityManager is active
2866      */
2867     private void checkPackageAccess(SecurityManager sm, final ClassLoader ccl,
2868                                     boolean checkProxyInterfaces) {
2869         final ClassLoader cl = getClassLoader0();
2870 
2871         if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2872             String pkg = this.getPackageName();
2873             if (pkg != null && !pkg.isEmpty()) {
2874                 // skip the package access check on a proxy class in default proxy package
2875                 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
2876                     sm.checkPackageAccess(pkg);
2877                 }
2878             }
2879         }
2880         // check package access on the proxy interfaces
2881         if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
2882             ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
2883         }
2884     }
2885 
2886     /**
2887      * Add a package name prefix if the name is not absolute Remove leading "/"
2888      * if name is absolute
2889      */
2890     private String resolveName(String name) {
2891         if (!name.startsWith("/")) {
2892             Class<?> c = this;
2893             while (c.isArray()) {
2894                 c = c.getComponentType();
2895             }
2896             String baseName = c.getPackageName();
2897             if (baseName != null && !baseName.isEmpty()) {
2898                 name = baseName.replace('.', '/') + "/" + name;
2899             }
2900         } else {
2901             name = name.substring(1);
2902         }
2903         return name;
2904     }
2905 
2906     /**
2907      * Atomic operations support.
2908      */
2909     private static class Atomic {
2910         // initialize Unsafe machinery here, since we need to call Class.class instance method
2911         // and have to avoid calling it in the static initializer of the Class class...
2912         private static final Unsafe unsafe = Unsafe.getUnsafe();
2913         // offset of Class.reflectionData instance field
2914         private static final long reflectionDataOffset
2915                 = unsafe.objectFieldOffset(Class.class, "reflectionData");
2916         // offset of Class.annotationType instance field
2917         private static final long annotationTypeOffset
2918                 = unsafe.objectFieldOffset(Class.class, "annotationType");
2919         // offset of Class.annotationData instance field
2920         private static final long annotationDataOffset
2921                 = unsafe.objectFieldOffset(Class.class, "annotationData");
2922 
2923         static <T> boolean casReflectionData(Class<?> clazz,
2924                                              SoftReference<ReflectionData<T>> oldData,
2925                                              SoftReference<ReflectionData<T>> newData) {
2926             return unsafe.compareAndSetReference(clazz, reflectionDataOffset, oldData, newData);
2927         }
2928 
2929         static <T> boolean casAnnotationType(Class<?> clazz,
2930                                              AnnotationType oldType,
2931                                              AnnotationType newType) {
2932             return unsafe.compareAndSetReference(clazz, annotationTypeOffset, oldType, newType);
2933         }
2934 
2935         static <T> boolean casAnnotationData(Class<?> clazz,
2936                                              AnnotationData oldData,
2937                                              AnnotationData newData) {
2938             return unsafe.compareAndSetReference(clazz, annotationDataOffset, oldData, newData);
2939         }
2940     }
2941 
2942     /**
2943      * Reflection support.
2944      */
2945 
2946     // Reflection data caches various derived names and reflective members. Cached
2947     // values may be invalidated when JVM TI RedefineClasses() is called
2948     private static class ReflectionData<T> {
2949         volatile Field[] declaredFields;
2950         volatile Field[] publicFields;
2951         volatile Method[] declaredMethods;
2952         volatile Method[] publicMethods;
2953         volatile Constructor<T>[] declaredConstructors;
2954         volatile Constructor<T>[] publicConstructors;
2955         // Intermediate results for getFields and getMethods
2956         volatile Field[] declaredPublicFields;
2957         volatile Method[] declaredPublicMethods;
2958         volatile Class<?>[] interfaces;
2959 
2960         // Cached names
2961         String simpleName;
2962         String canonicalName;
2963         static final String NULL_SENTINEL = new String();
2964 
2965         // Value of classRedefinedCount when we created this ReflectionData instance
2966         final int redefinedCount;
2967 
2968         ReflectionData(int redefinedCount) {
2969             this.redefinedCount = redefinedCount;
2970         }
2971     }
2972 
2973     private transient volatile SoftReference<ReflectionData<T>> reflectionData;
2974 
2975     // Incremented by the VM on each call to JVM TI RedefineClasses()
2976     // that redefines this class or a superclass.
2977     private transient volatile int classRedefinedCount;
2978 
2979     // Lazily create and cache ReflectionData
2980     private ReflectionData<T> reflectionData() {
2981         SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
2982         int classRedefinedCount = this.classRedefinedCount;
2983         ReflectionData<T> rd;
2984         if (reflectionData != null &&
2985             (rd = reflectionData.get()) != null &&
2986             rd.redefinedCount == classRedefinedCount) {
2987             return rd;
2988         }
2989         // else no SoftReference or cleared SoftReference or stale ReflectionData
2990         // -> create and replace new instance
2991         return newReflectionData(reflectionData, classRedefinedCount);
2992     }
2993 
2994     private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
2995                                                 int classRedefinedCount) {
2996         while (true) {
2997             ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
2998             // try to CAS it...
2999             if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
3000                 return rd;
3001             }
3002             // else retry
3003             oldReflectionData = this.reflectionData;
3004             classRedefinedCount = this.classRedefinedCount;
3005             if (oldReflectionData != null &&
3006                 (rd = oldReflectionData.get()) != null &&
3007                 rd.redefinedCount == classRedefinedCount) {
3008                 return rd;
3009             }
3010         }
3011     }
3012 
3013     // Generic signature handling
3014     private native String getGenericSignature0();
3015 
3016     // Generic info repository; lazily initialized
3017     private transient volatile ClassRepository genericInfo;
3018 
3019     // accessor for factory
3020     private GenericsFactory getFactory() {
3021         // create scope and factory
3022         return CoreReflectionFactory.make(this, ClassScope.make(this));
3023     }
3024 
3025     // accessor for generic info repository;
3026     // generic info is lazily initialized
3027     private ClassRepository getGenericInfo() {
3028         ClassRepository genericInfo = this.genericInfo;
3029         if (genericInfo == null) {
3030             String signature = getGenericSignature0();
3031             if (signature == null) {
3032                 genericInfo = ClassRepository.NONE;
3033             } else {
3034                 genericInfo = ClassRepository.make(signature, getFactory());
3035             }
3036             this.genericInfo = genericInfo;
3037         }
3038         return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
3039     }
3040 
3041     // Annotations handling
3042     native byte[] getRawAnnotations();
3043     // Since 1.8
3044     native byte[] getRawTypeAnnotations();
3045     static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
3046         return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
3047     }
3048 
3049     native ConstantPool getConstantPool();
3050 
3051     //
3052     //
3053     // java.lang.reflect.Field handling
3054     //
3055     //
3056 
3057     // Returns an array of "root" fields. These Field objects must NOT
3058     // be propagated to the outside world, but must instead be copied
3059     // via ReflectionFactory.copyField.
3060     private Field[] privateGetDeclaredFields(boolean publicOnly) {
3061         Field[] res;
3062         ReflectionData<T> rd = reflectionData();
3063         if (rd != null) {
3064             res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
3065             if (res != null) return res;
3066         }
3067         // No cached value available; request value from VM
3068         res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
3069         if (rd != null) {
3070             if (publicOnly) {
3071                 rd.declaredPublicFields = res;
3072             } else {
3073                 rd.declaredFields = res;
3074             }
3075         }
3076         return res;
3077     }
3078 
3079     // Returns an array of "root" fields. These Field objects must NOT
3080     // be propagated to the outside world, but must instead be copied
3081     // via ReflectionFactory.copyField.
3082     private Field[] privateGetPublicFields() {
3083         Field[] res;
3084         ReflectionData<T> rd = reflectionData();
3085         if (rd != null) {
3086             res = rd.publicFields;
3087             if (res != null) return res;
3088         }
3089 
3090         // Use a linked hash set to ensure order is preserved and
3091         // fields from common super interfaces are not duplicated
3092         LinkedHashSet<Field> fields = new LinkedHashSet<>();
3093 
3094         // Local fields
3095         addAll(fields, privateGetDeclaredFields(true));
3096 
3097         // Direct superinterfaces, recursively
3098         for (Class<?> si : getInterfaces()) {
3099             addAll(fields, si.privateGetPublicFields());
3100         }
3101 
3102         // Direct superclass, recursively
3103         Class<?> sc = getSuperclass();
3104         if (sc != null) {
3105             addAll(fields, sc.privateGetPublicFields());
3106         }
3107 
3108         res = fields.toArray(new Field[0]);
3109         if (rd != null) {
3110             rd.publicFields = res;
3111         }
3112         return res;
3113     }
3114 
3115     private static void addAll(Collection<Field> c, Field[] o) {
3116         for (Field f : o) {
3117             c.add(f);
3118         }
3119     }
3120 
3121 
3122     //
3123     //
3124     // java.lang.reflect.Constructor handling
3125     //
3126     //
3127 
3128     // Returns an array of "root" constructors. These Constructor
3129     // objects must NOT be propagated to the outside world, but must
3130     // instead be copied via ReflectionFactory.copyConstructor.
3131     private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
3132         Constructor<T>[] res;
3133         ReflectionData<T> rd = reflectionData();
3134         if (rd != null) {
3135             res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
3136             if (res != null) return res;
3137         }
3138         // No cached value available; request value from VM
3139         if (isInterface()) {
3140             @SuppressWarnings("unchecked")
3141             Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
3142             res = temporaryRes;
3143         } else {
3144             res = getDeclaredConstructors0(publicOnly);
3145         }
3146         if (rd != null) {
3147             if (publicOnly) {
3148                 rd.publicConstructors = res;
3149             } else {
3150                 rd.declaredConstructors = res;
3151             }
3152         }
3153         return res;
3154     }
3155 
3156     //
3157     //
3158     // java.lang.reflect.Method handling
3159     //
3160     //
3161 
3162     // Returns an array of "root" methods. These Method objects must NOT
3163     // be propagated to the outside world, but must instead be copied
3164     // via ReflectionFactory.copyMethod.
3165     private Method[] privateGetDeclaredMethods(boolean publicOnly) {
3166         Method[] res;
3167         ReflectionData<T> rd = reflectionData();
3168         if (rd != null) {
3169             res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
3170             if (res != null) return res;
3171         }
3172         // No cached value available; request value from VM
3173         res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
3174         if (rd != null) {
3175             if (publicOnly) {
3176                 rd.declaredPublicMethods = res;
3177             } else {
3178                 rd.declaredMethods = res;
3179             }
3180         }
3181         return res;
3182     }
3183 
3184     // Returns an array of "root" methods. These Method objects must NOT
3185     // be propagated to the outside world, but must instead be copied
3186     // via ReflectionFactory.copyMethod.
3187     private Method[] privateGetPublicMethods() {
3188         Method[] res;
3189         ReflectionData<T> rd = reflectionData();
3190         if (rd != null) {
3191             res = rd.publicMethods;
3192             if (res != null) return res;
3193         }
3194 
3195         // No cached value available; compute value recursively.
3196         // Start by fetching public declared methods...
3197         PublicMethods pms = new PublicMethods();
3198         for (Method m : privateGetDeclaredMethods(/* publicOnly */ true)) {
3199             pms.merge(m);
3200         }
3201         // ...then recur over superclass methods...
3202         Class<?> sc = getSuperclass();
3203         if (sc != null) {
3204             for (Method m : sc.privateGetPublicMethods()) {
3205                 pms.merge(m);
3206             }
3207         }
3208         // ...and finally over direct superinterfaces.
3209         for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
3210             for (Method m : intf.privateGetPublicMethods()) {
3211                 // static interface methods are not inherited
3212                 if (!Modifier.isStatic(m.getModifiers())) {
3213                     pms.merge(m);
3214                 }
3215             }
3216         }
3217 
3218         res = pms.toArray();
3219         if (rd != null) {
3220             rd.publicMethods = res;
3221         }
3222         return res;
3223     }
3224 
3225 
3226     //
3227     // Helpers for fetchers of one field, method, or constructor
3228     //
3229 
3230     // This method does not copy the returned Field object!
3231     private static Field searchFields(Field[] fields, String name) {
3232         for (Field field : fields) {
3233             if (field.getName().equals(name)) {
3234                 return field;
3235             }
3236         }
3237         return null;
3238     }
3239 
3240     // Returns a "root" Field object. This Field object must NOT
3241     // be propagated to the outside world, but must instead be copied
3242     // via ReflectionFactory.copyField.
3243     private Field getField0(String name) {
3244         // Note: the intent is that the search algorithm this routine
3245         // uses be equivalent to the ordering imposed by
3246         // privateGetPublicFields(). It fetches only the declared
3247         // public fields for each class, however, to reduce the number
3248         // of Field objects which have to be created for the common
3249         // case where the field being requested is declared in the
3250         // class which is being queried.
3251         Field res;
3252         // Search declared public fields
3253         if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
3254             return res;
3255         }
3256         // Direct superinterfaces, recursively
3257         Class<?>[] interfaces = getInterfaces(/* cloneArray */ false);
3258         for (Class<?> c : interfaces) {
3259             if ((res = c.getField0(name)) != null) {
3260                 return res;
3261             }
3262         }
3263         // Direct superclass, recursively
3264         if (!isInterface()) {
3265             Class<?> c = getSuperclass();
3266             if (c != null) {
3267                 if ((res = c.getField0(name)) != null) {
3268                     return res;
3269                 }
3270             }
3271         }
3272         return null;
3273     }
3274 
3275     // This method does not copy the returned Method object!
3276     private static Method searchMethods(Method[] methods,
3277                                         String name,
3278                                         Class<?>[] parameterTypes)
3279     {
3280         ReflectionFactory fact = getReflectionFactory();
3281         Method res = null;
3282         for (Method m : methods) {
3283             if (m.getName().equals(name)
3284                 && arrayContentsEq(parameterTypes,
3285                                    fact.getExecutableSharedParameterTypes(m))
3286                 && (res == null
3287                     || (res.getReturnType() != m.getReturnType()
3288                         && res.getReturnType().isAssignableFrom(m.getReturnType()))))
3289                 res = m;
3290         }
3291         return res;
3292     }
3293 
3294     private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
3295 
3296     // Returns a "root" Method object. This Method object must NOT
3297     // be propagated to the outside world, but must instead be copied
3298     // via ReflectionFactory.copyMethod.
3299     private Method getMethod0(String name, Class<?>[] parameterTypes) {
3300         PublicMethods.MethodList res = getMethodsRecursive(
3301             name,
3302             parameterTypes == null ? EMPTY_CLASS_ARRAY : parameterTypes,
3303             /* includeStatic */ true);
3304         return res == null ? null : res.getMostSpecific();
3305     }
3306 
3307     // Returns a list of "root" Method objects. These Method objects must NOT
3308     // be propagated to the outside world, but must instead be copied
3309     // via ReflectionFactory.copyMethod.
3310     private PublicMethods.MethodList getMethodsRecursive(String name,
3311                                                          Class<?>[] parameterTypes,
3312                                                          boolean includeStatic) {
3313         // 1st check declared public methods
3314         Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
3315         PublicMethods.MethodList res = PublicMethods.MethodList
3316             .filter(methods, name, parameterTypes, includeStatic);
3317         // if there is at least one match among declared methods, we need not
3318         // search any further as such match surely overrides matching methods
3319         // declared in superclass(es) or interface(s).
3320         if (res != null) {
3321             return res;
3322         }
3323 
3324         // if there was no match among declared methods,
3325         // we must consult the superclass (if any) recursively...
3326         Class<?> sc = getSuperclass();
3327         if (sc != null) {
3328             res = sc.getMethodsRecursive(name, parameterTypes, includeStatic);
3329         }
3330 
3331         // ...and coalesce the superclass methods with methods obtained
3332         // from directly implemented interfaces excluding static methods...
3333         for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
3334             res = PublicMethods.MethodList.merge(
3335                 res, intf.getMethodsRecursive(name, parameterTypes,
3336                                               /* includeStatic */ false));
3337         }
3338 
3339         return res;
3340     }
3341 
3342     // Returns a "root" Constructor object. This Constructor object must NOT
3343     // be propagated to the outside world, but must instead be copied
3344     // via ReflectionFactory.copyConstructor.
3345     private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
3346                                         int which) throws NoSuchMethodException
3347     {
3348         ReflectionFactory fact = getReflectionFactory();
3349         Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
3350         for (Constructor<T> constructor : constructors) {
3351             if (arrayContentsEq(parameterTypes,
3352                                 fact.getExecutableSharedParameterTypes(constructor))) {
3353                 return constructor;
3354             }
3355         }
3356         throw new NoSuchMethodException(methodToString("<init>", parameterTypes));
3357     }
3358 
3359     //
3360     // Other helpers and base implementation
3361     //
3362 
3363     private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
3364         if (a1 == null) {
3365             return a2 == null || a2.length == 0;
3366         }
3367 
3368         if (a2 == null) {
3369             return a1.length == 0;
3370         }
3371 
3372         if (a1.length != a2.length) {
3373             return false;
3374         }
3375 
3376         for (int i = 0; i < a1.length; i++) {
3377             if (a1[i] != a2[i]) {
3378                 return false;
3379             }
3380         }
3381 
3382         return true;
3383     }
3384 
3385     private static Field[] copyFields(Field[] arg) {
3386         Field[] out = new Field[arg.length];
3387         ReflectionFactory fact = getReflectionFactory();
3388         for (int i = 0; i < arg.length; i++) {
3389             out[i] = fact.copyField(arg[i]);
3390         }
3391         return out;
3392     }
3393 
3394     private static Method[] copyMethods(Method[] arg) {
3395         Method[] out = new Method[arg.length];
3396         ReflectionFactory fact = getReflectionFactory();
3397         for (int i = 0; i < arg.length; i++) {
3398             out[i] = fact.copyMethod(arg[i]);
3399         }
3400         return out;
3401     }
3402 
3403     private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
3404         Constructor<U>[] out = arg.clone();
3405         ReflectionFactory fact = getReflectionFactory();
3406         for (int i = 0; i < out.length; i++) {
3407             out[i] = fact.copyConstructor(out[i]);
3408         }
3409         return out;
3410     }
3411 
3412     private native Field[]       getDeclaredFields0(boolean publicOnly);
3413     private native Method[]      getDeclaredMethods0(boolean publicOnly);
3414     private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
3415     private native Class<?>[]   getDeclaredClasses0();
3416 
3417     /**
3418      * Helper method to get the method name from arguments.
3419      */
3420     private String methodToString(String name, Class<?>[] argTypes) {
3421         StringBuilder sb = new StringBuilder();
3422         sb.append(getName() + "." + name + "(");
3423         if (argTypes != null) {
3424             sb.append(Arrays.stream(argTypes)
3425                       .map(c -> (c == null) ? "null" : c.getName())
3426                       .collect(Collectors.joining(",")));
3427         }
3428         sb.append(")");
3429         return sb.toString();
3430     }
3431 
3432     /** use serialVersionUID from JDK 1.1 for interoperability */
3433     private static final long serialVersionUID = 3206093459760846163L;
3434 
3435 
3436     /**
3437      * Class Class is special cased within the Serialization Stream Protocol.
3438      *
3439      * A Class instance is written initially into an ObjectOutputStream in the
3440      * following format:
3441      * <pre>
3442      *      {@code TC_CLASS} ClassDescriptor
3443      *      A ClassDescriptor is a special cased serialization of
3444      *      a {@code java.io.ObjectStreamClass} instance.
3445      * </pre>
3446      * A new handle is generated for the initial time the class descriptor
3447      * is written into the stream. Future references to the class descriptor
3448      * are written as references to the initial class descriptor instance.
3449      *
3450      * @see java.io.ObjectStreamClass
3451      */
3452     private static final ObjectStreamField[] serialPersistentFields =
3453         new ObjectStreamField[0];
3454 
3455 
3456     /**
3457      * Returns the assertion status that would be assigned to this
3458      * class if it were to be initialized at the time this method is invoked.
3459      * If this class has had its assertion status set, the most recent
3460      * setting will be returned; otherwise, if any package default assertion
3461      * status pertains to this class, the most recent setting for the most
3462      * specific pertinent package default assertion status is returned;
3463      * otherwise, if this class is not a system class (i.e., it has a
3464      * class loader) its class loader's default assertion status is returned;
3465      * otherwise, the system class default assertion status is returned.
3466      * <p>
3467      * Few programmers will have any need for this method; it is provided
3468      * for the benefit of the JRE itself.  (It allows a class to determine at
3469      * the time that it is initialized whether assertions should be enabled.)
3470      * Note that this method is not guaranteed to return the actual
3471      * assertion status that was (or will be) associated with the specified
3472      * class when it was (or will be) initialized.
3473      *
3474      * @return the desired assertion status of the specified class.
3475      * @see    java.lang.ClassLoader#setClassAssertionStatus
3476      * @see    java.lang.ClassLoader#setPackageAssertionStatus
3477      * @see    java.lang.ClassLoader#setDefaultAssertionStatus
3478      * @since  1.4
3479      */
3480     public boolean desiredAssertionStatus() {
3481         ClassLoader loader = getClassLoader0();
3482         // If the loader is null this is a system class, so ask the VM
3483         if (loader == null)
3484             return desiredAssertionStatus0(this);
3485 
3486         // If the classloader has been initialized with the assertion
3487         // directives, ask it. Otherwise, ask the VM.
3488         synchronized(loader.assertionLock) {
3489             if (loader.classAssertionStatus != null) {
3490                 return loader.desiredAssertionStatus(getName());
3491             }
3492         }
3493         return desiredAssertionStatus0(this);
3494     }
3495 
3496     // Retrieves the desired assertion status of this class from the VM
3497     private static native boolean desiredAssertionStatus0(Class<?> clazz);
3498 
3499     /**
3500      * Returns true if and only if this class was declared as an enum in the
3501      * source code.
3502      *
3503      * @return true if and only if this class was declared as an enum in the
3504      *     source code
3505      * @since 1.5
3506      */
3507     public boolean isEnum() {
3508         // An enum must both directly extend java.lang.Enum and have
3509         // the ENUM bit set; classes for specialized enum constants
3510         // don't do the former.
3511         return (this.getModifiers() & ENUM) != 0 &&
3512         this.getSuperclass() == java.lang.Enum.class;
3513     }
3514 
3515     // Fetches the factory for reflective objects
3516     private static ReflectionFactory getReflectionFactory() {
3517         if (reflectionFactory == null) {
3518             reflectionFactory =
3519                 java.security.AccessController.doPrivileged
3520                     (new ReflectionFactory.GetReflectionFactoryAction());
3521         }
3522         return reflectionFactory;
3523     }
3524     private static ReflectionFactory reflectionFactory;
3525 
3526     /**
3527      * Returns the elements of this enum class or null if this
3528      * Class object does not represent an enum type.
3529      *
3530      * @return an array containing the values comprising the enum class
3531      *     represented by this Class object in the order they're
3532      *     declared, or null if this Class object does not
3533      *     represent an enum type
3534      * @since 1.5
3535      */
3536     public T[] getEnumConstants() {
3537         T[] values = getEnumConstantsShared();
3538         return (values != null) ? values.clone() : null;
3539     }
3540 
3541     /**
3542      * Returns the elements of this enum class or null if this
3543      * Class object does not represent an enum type;
3544      * identical to getEnumConstants except that the result is
3545      * uncloned, cached, and shared by all callers.
3546      */
3547     T[] getEnumConstantsShared() {
3548         T[] constants = enumConstants;
3549         if (constants == null) {
3550             if (!isEnum()) return null;
3551             try {
3552                 final Method values = getMethod("values");
3553                 java.security.AccessController.doPrivileged(
3554                     new java.security.PrivilegedAction<>() {
3555                         public Void run() {
3556                                 values.setAccessible(true);
3557                                 return null;
3558                             }
3559                         });
3560                 @SuppressWarnings("unchecked")
3561                 T[] temporaryConstants = (T[])values.invoke(null);
3562                 enumConstants = constants = temporaryConstants;
3563             }
3564             // These can happen when users concoct enum-like classes
3565             // that don't comply with the enum spec.
3566             catch (InvocationTargetException | NoSuchMethodException |
3567                    IllegalAccessException ex) { return null; }
3568         }
3569         return constants;
3570     }
3571     private transient volatile T[] enumConstants;
3572 
3573     /**
3574      * Returns a map from simple name to enum constant.  This package-private
3575      * method is used internally by Enum to implement
3576      * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
3577      * efficiently.  Note that the map is returned by this method is
3578      * created lazily on first use.  Typically it won't ever get created.
3579      */
3580     Map<String, T> enumConstantDirectory() {
3581         Map<String, T> directory = enumConstantDirectory;
3582         if (directory == null) {
3583             T[] universe = getEnumConstantsShared();
3584             if (universe == null)
3585                 throw new IllegalArgumentException(
3586                     getName() + " is not an enum type");
3587             directory = new HashMap<>((int)(universe.length / 0.75f) + 1);
3588             for (T constant : universe) {
3589                 directory.put(((Enum<?>)constant).name(), constant);
3590             }
3591             enumConstantDirectory = directory;
3592         }
3593         return directory;
3594     }
3595     private transient volatile Map<String, T> enumConstantDirectory;
3596 
3597     /**
3598      * Casts an object to the class or interface represented
3599      * by this {@code Class} object.
3600      *
3601      * @param obj the object to be cast
3602      * @return the object after casting, or null if obj is null
3603      *
3604      * @throws ClassCastException if the object is not
3605      * null and is not assignable to the type T.
3606      *
3607      * @since 1.5
3608      */
3609     @SuppressWarnings("unchecked")
3610     @HotSpotIntrinsicCandidate
3611     public T cast(Object obj) {
3612         if (obj != null && !isInstance(obj))
3613             throw new ClassCastException(cannotCastMsg(obj));
3614         return (T) obj;
3615     }
3616 
3617     private String cannotCastMsg(Object obj) {
3618         return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3619     }
3620 
3621     /**
3622      * Casts this {@code Class} object to represent a subclass of the class
3623      * represented by the specified class object.  Checks that the cast
3624      * is valid, and throws a {@code ClassCastException} if it is not.  If
3625      * this method succeeds, it always returns a reference to this class object.
3626      *
3627      * <p>This method is useful when a client needs to "narrow" the type of
3628      * a {@code Class} object to pass it to an API that restricts the
3629      * {@code Class} objects that it is willing to accept.  A cast would
3630      * generate a compile-time warning, as the correctness of the cast
3631      * could not be checked at runtime (because generic types are implemented
3632      * by erasure).
3633      *
3634      * @param <U> the type to cast this class object to
3635      * @param clazz the class of the type to cast this class object to
3636      * @return this {@code Class} object, cast to represent a subclass of
3637      *    the specified class object.
3638      * @throws ClassCastException if this {@code Class} object does not
3639      *    represent a subclass of the specified class (here "subclass" includes
3640      *    the class itself).
3641      * @since 1.5
3642      */
3643     @SuppressWarnings("unchecked")
3644     public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3645         if (clazz.isAssignableFrom(this))
3646             return (Class<? extends U>) this;
3647         else
3648             throw new ClassCastException(this.toString());
3649     }
3650 
3651     /**
3652      * @throws NullPointerException {@inheritDoc}
3653      * @since 1.5
3654      */
3655     @SuppressWarnings("unchecked")
3656     public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3657         Objects.requireNonNull(annotationClass);
3658 
3659         return (A) annotationData().annotations.get(annotationClass);
3660     }
3661 
3662     /**
3663      * {@inheritDoc}
3664      * @throws NullPointerException {@inheritDoc}
3665      * @since 1.5
3666      */
3667     @Override
3668     public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3669         return GenericDeclaration.super.isAnnotationPresent(annotationClass);
3670     }
3671 
3672     /**
3673      * @throws NullPointerException {@inheritDoc}
3674      * @since 1.8
3675      */
3676     @Override
3677     public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
3678         Objects.requireNonNull(annotationClass);
3679 
3680         AnnotationData annotationData = annotationData();
3681         return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
3682                                                           this,
3683                                                           annotationClass);
3684     }
3685 
3686     /**
3687      * @since 1.5
3688      */
3689     public Annotation[] getAnnotations() {
3690         return AnnotationParser.toArray(annotationData().annotations);
3691     }
3692 
3693     /**
3694      * @throws NullPointerException {@inheritDoc}
3695      * @since 1.8
3696      */
3697     @Override
3698     @SuppressWarnings("unchecked")
3699     public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3700         Objects.requireNonNull(annotationClass);
3701 
3702         return (A) annotationData().declaredAnnotations.get(annotationClass);
3703     }
3704 
3705     /**
3706      * @throws NullPointerException {@inheritDoc}
3707      * @since 1.8
3708      */
3709     @Override
3710     public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
3711         Objects.requireNonNull(annotationClass);
3712 
3713         return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
3714                                                                  annotationClass);
3715     }
3716 
3717     /**
3718      * @since 1.5
3719      */
3720     public Annotation[] getDeclaredAnnotations()  {
3721         return AnnotationParser.toArray(annotationData().declaredAnnotations);
3722     }
3723 
3724     // annotation data that might get invalidated when JVM TI RedefineClasses() is called
3725     private static class AnnotationData {
3726         final Map<Class<? extends Annotation>, Annotation> annotations;
3727         final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3728 
3729         // Value of classRedefinedCount when we created this AnnotationData instance
3730         final int redefinedCount;
3731 
3732         AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
3733                        Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
3734                        int redefinedCount) {
3735             this.annotations = annotations;
3736             this.declaredAnnotations = declaredAnnotations;
3737             this.redefinedCount = redefinedCount;
3738         }
3739     }
3740 
3741     // Annotations cache
3742     @SuppressWarnings("UnusedDeclaration")
3743     private transient volatile AnnotationData annotationData;
3744 
3745     private AnnotationData annotationData() {
3746         while (true) { // retry loop
3747             AnnotationData annotationData = this.annotationData;
3748             int classRedefinedCount = this.classRedefinedCount;
3749             if (annotationData != null &&
3750                 annotationData.redefinedCount == classRedefinedCount) {
3751                 return annotationData;
3752             }
3753             // null or stale annotationData -> optimistically create new instance
3754             AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
3755             // try to install it
3756             if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
3757                 // successfully installed new AnnotationData
3758                 return newAnnotationData;
3759             }
3760         }
3761     }
3762 
3763     private AnnotationData createAnnotationData(int classRedefinedCount) {
3764         Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
3765             AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
3766         Class<?> superClass = getSuperclass();
3767         Map<Class<? extends Annotation>, Annotation> annotations = null;
3768         if (superClass != null) {
3769             Map<Class<? extends Annotation>, Annotation> superAnnotations =
3770                 superClass.annotationData().annotations;
3771             for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
3772                 Class<? extends Annotation> annotationClass = e.getKey();
3773                 if (AnnotationType.getInstance(annotationClass).isInherited()) {
3774                     if (annotations == null) { // lazy construction
3775                         annotations = new LinkedHashMap<>((Math.max(
3776                                 declaredAnnotations.size(),
3777                                 Math.min(12, declaredAnnotations.size() + superAnnotations.size())
3778                             ) * 4 + 2) / 3
3779                         );
3780                     }
3781                     annotations.put(annotationClass, e.getValue());
3782                 }
3783             }
3784         }
3785         if (annotations == null) {
3786             // no inherited annotations -> share the Map with declaredAnnotations
3787             annotations = declaredAnnotations;
3788         } else {
3789             // at least one inherited annotation -> declared may override inherited
3790             annotations.putAll(declaredAnnotations);
3791         }
3792         return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
3793     }
3794 
3795     // Annotation types cache their internal (AnnotationType) form
3796 
3797     @SuppressWarnings("UnusedDeclaration")
3798     private transient volatile AnnotationType annotationType;
3799 
3800     boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
3801         return Atomic.casAnnotationType(this, oldType, newType);
3802     }
3803 
3804     AnnotationType getAnnotationType() {
3805         return annotationType;
3806     }
3807 
3808     Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() {
3809         return annotationData().declaredAnnotations;
3810     }
3811 
3812     /* Backing store of user-defined values pertaining to this class.
3813      * Maintained by the ClassValue class.
3814      */
3815     transient ClassValue.ClassValueMap classValueMap;
3816 
3817     /**
3818      * Returns an {@code AnnotatedType} object that represents the use of a
3819      * type to specify the superclass of the entity represented by this {@code
3820      * Class} object. (The <em>use</em> of type Foo to specify the superclass
3821      * in '...  extends Foo' is distinct from the <em>declaration</em> of type
3822      * Foo.)
3823      *
3824      * <p> If this {@code Class} object represents a type whose declaration
3825      * does not explicitly indicate an annotated superclass, then the return
3826      * value is an {@code AnnotatedType} object representing an element with no
3827      * annotations.
3828      *
3829      * <p> If this {@code Class} represents either the {@code Object} class, an
3830      * interface type, an array type, a primitive type, or void, the return
3831      * value is {@code null}.
3832      *
3833      * @return an object representing the superclass
3834      * @since 1.8
3835      */
3836     public AnnotatedType getAnnotatedSuperclass() {
3837         if (this == Object.class ||
3838                 isInterface() ||
3839                 isArray() ||
3840                 isPrimitive() ||
3841                 this == Void.TYPE) {
3842             return null;
3843         }
3844 
3845         return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
3846     }
3847 
3848     /**
3849      * Returns an array of {@code AnnotatedType} objects that represent the use
3850      * of types to specify superinterfaces of the entity represented by this
3851      * {@code Class} object. (The <em>use</em> of type Foo to specify a
3852      * superinterface in '... implements Foo' is distinct from the
3853      * <em>declaration</em> of type Foo.)
3854      *
3855      * <p> If this {@code Class} object represents a class, the return value is
3856      * an array containing objects representing the uses of interface types to
3857      * specify interfaces implemented by the class. The order of the objects in
3858      * the array corresponds to the order of the interface types used in the
3859      * 'implements' clause of the declaration of this {@code Class} object.
3860      *
3861      * <p> If this {@code Class} object represents an interface, the return
3862      * value is an array containing objects representing the uses of interface
3863      * types to specify interfaces directly extended by the interface. The
3864      * order of the objects in the array corresponds to the order of the
3865      * interface types used in the 'extends' clause of the declaration of this
3866      * {@code Class} object.
3867      *
3868      * <p> If this {@code Class} object represents a class or interface whose
3869      * declaration does not explicitly indicate any annotated superinterfaces,
3870      * the return value is an array of length 0.
3871      *
3872      * <p> If this {@code Class} object represents either the {@code Object}
3873      * class, an array type, a primitive type, or void, the return value is an
3874      * array of length 0.
3875      *
3876      * @return an array representing the superinterfaces
3877      * @since 1.8
3878      */
3879     public AnnotatedType[] getAnnotatedInterfaces() {
3880          return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
3881     }
3882 
3883     private native Class<?> getNestHost0();
3884 
3885     /**
3886      * Returns the nest host of the <a href=#nest>nest</a> to which the class
3887      * or interface represented by this {@code Class} object belongs.
3888      * Every class and interface is a member of exactly one nest.
3889      * A class or interface that is not recorded as belonging to a nest
3890      * belongs to the nest consisting only of itself, and is the nest
3891      * host.
3892      *
3893      * <p>Each of the {@code Class} objects representing array types,
3894      * primitive types, and {@code void} returns {@code this} to indicate
3895      * that the represented entity belongs to the nest consisting only of
3896      * itself, and is the nest host.
3897      *
3898      * <p>If there is a {@linkplain LinkageError linkage error} accessing
3899      * the nest host, or if this class or interface is not enumerated as
3900      * a member of the nest by the nest host, then it is considered to belong
3901      * to its own nest and {@code this} is returned as the host.
3902      *
3903      * @apiNote A {@code class} file of version 55.0 or greater may record the
3904      * host of the nest to which it belongs by using the {@code NestHost}
3905      * attribute (JVMS 4.7.28). Alternatively, a {@code class} file of
3906      * version 55.0 or greater may act as a nest host by enumerating the nest's
3907      * other members with the
3908      * {@code NestMembers} attribute (JVMS 4.7.29).
3909      * A {@code class} file of version 54.0 or lower does not use these
3910      * attributes.
3911      *
3912      * @return the nest host of this class or interface
3913      *
3914      * @throws SecurityException
3915      *         If the returned class is not the current class, and
3916      *         if a security manager, <i>s</i>, is present and the caller's
3917      *         class loader is not the same as or an ancestor of the class
3918      *         loader for the returned class and invocation of {@link
3919      *         SecurityManager#checkPackageAccess s.checkPackageAccess()}
3920      *         denies access to the package of the returned class
3921      * @since 11
3922      * @jvms 4.7.28 and 4.7.29 NestHost and NestMembers attributes
3923      * @jvms 5.4.4 Access Control
3924      */
3925     @CallerSensitive
3926     public Class<?> getNestHost() {
3927         if (isPrimitive() || isArray()) {
3928             return this;
3929         }
3930         Class<?> host;
3931         try {
3932             host = getNestHost0();
3933         } catch (LinkageError e) {
3934             // if we couldn't load our nest-host then we
3935             // act as-if we have no nest-host attribute
3936             return this;
3937         }
3938         // if null then nest membership validation failed, so we
3939         // act as-if we have no nest-host attribute
3940         if (host == null || host == this) {
3941             return this;
3942         }
3943         // returning a different class requires a security check
3944         SecurityManager sm = System.getSecurityManager();
3945         if (sm != null) {
3946             checkPackageAccess(sm,
3947                                ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
3948         }
3949         return host;
3950     }
3951 
3952     /**
3953      * Determines if the given {@code Class} is a nestmate of the
3954      * class or interface represented by this {@code Class} object.
3955      * Two classes or interfaces are nestmates
3956      * if they have the same {@linkplain #getNestHost() nest host}.
3957      *
3958      * @param c the class to check
3959      * @return {@code true} if this class and {@code c} are members of
3960      * the same nest; and {@code false} otherwise.
3961      *
3962      * @since 11
3963      */
3964     public boolean isNestmateOf(Class<?> c) {
3965         if (this == c) {
3966             return true;
3967         }
3968         if (isPrimitive() || isArray() ||
3969             c.isPrimitive() || c.isArray()) {
3970             return false;
3971         }
3972         try {
3973             return getNestHost0() == c.getNestHost0();
3974         } catch (LinkageError e) {
3975             return false;
3976         }
3977     }
3978 
3979     private native Class<?>[] getNestMembers0();
3980 
3981     /**
3982      * Returns an array containing {@code Class} objects representing all the
3983      * classes and interfaces that are members of the nest to which the class
3984      * or interface represented by this {@code Class} object belongs.
3985      * The {@linkplain #getNestHost() nest host} of that nest is the zeroth
3986      * element of the array. Subsequent elements represent any classes or
3987      * interfaces that are recorded by the nest host as being members of
3988      * the nest; the order of such elements is unspecified. Duplicates are
3989      * permitted.
3990      * If the nest host of that nest does not enumerate any members, then the
3991      * array has a single element containing {@code this}.
3992      *
3993      * <p>Each of the {@code Class} objects representing array types,
3994      * primitive types, and {@code void} returns an array containing only
3995      * {@code this}.
3996      *
3997      * <p>This method validates that, for each class or interface which is
3998      * recorded as a member of the nest by the nest host, that class or
3999      * interface records itself as a member of that same nest. Any exceptions
4000      * that occur during this validation are rethrown by this method.
4001      *
4002      * @return an array of all classes and interfaces in the same nest as
4003      * this class
4004      *
4005      * @throws LinkageError
4006      *         If there is any problem loading or validating a nest member or
4007      *         its nest host
4008      * @throws SecurityException
4009      *         If any returned class is not the current class, and
4010      *         if a security manager, <i>s</i>, is present and the caller's
4011      *         class loader is not the same as or an ancestor of the class
4012      *         loader for that returned class and invocation of {@link
4013      *         SecurityManager#checkPackageAccess s.checkPackageAccess()}
4014      *         denies access to the package of that returned class
4015      *
4016      * @since 11
4017      * @see #getNestHost()
4018      */
4019     @CallerSensitive
4020     public Class<?>[] getNestMembers() {
4021         if (isPrimitive() || isArray()) {
4022             return new Class<?>[] { this };
4023         }
4024         Class<?>[] members = getNestMembers0();
4025         // Can't actually enable this due to bootstrapping issues
4026         // assert(members.length != 1 || members[0] == this); // expected invariant from VM
4027 
4028         if (members.length > 1) {
4029             // If we return anything other than the current class we need
4030             // a security check
4031             SecurityManager sm = System.getSecurityManager();
4032             if (sm != null) {
4033                 checkPackageAccess(sm,
4034                                    ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
4035             }
4036         }
4037         return members;
4038     }
4039 
4040     /**
4041      * Returns the type descriptor string for this class.
4042      * <p>
4043      * Note that this is not a strict inverse of {@link #forName};
4044      * distinct classes which share a common name but have different class loaders
4045      * will have identical descriptor strings.
4046      *
4047      * @return the type descriptor representation
4048      * @jvms 4.3.2 Field Descriptors
4049      * @since 12
4050      */
4051     @Override
4052     public String descriptorString() {
4053         if (isPrimitive())
4054             return Wrapper.forPrimitiveType(this).basicTypeString();
4055         else if (isArray()) {
4056             return "[" + componentType.descriptorString();
4057         }
4058         else {
4059             return "L" + getName().replace('.', '/') + ";";
4060         }
4061     }
4062 
4063     /**
4064      * Returns the component type of this {@code Class}, if it describes
4065      * an array type, or {@code null} otherwise.
4066      *
4067      * @implSpec
4068      * Equivalent to {@link Class#getComponentType()}.
4069      *
4070      * @return a {@code Class} describing the component type, or {@code null}
4071      * if this {@code Class} does not describe an array type
4072      * @since 12
4073      */
4074     @Override
4075     public Class<?> componentType() {
4076         return isArray() ? componentType : null;
4077     }
4078 
4079     /**
4080      * Returns a {@code Class} for an array type whose component type
4081      * is described by this {@linkplain Class}.
4082      *
4083      * @return a {@code Class} describing the array type
4084      * @since 12
4085      */
4086     @Override
4087     public Class<?> arrayType() {
4088         return Array.newInstance(this, 0).getClass();
4089     }
4090 
4091     /**
4092      * Returns a nominal descriptor for this instance, if one can be
4093      * constructed, or an empty {@link Optional} if one cannot be.
4094      *
4095      * @return An {@link Optional} containing the resulting nominal descriptor,
4096      * or an empty {@link Optional} if one cannot be constructed.
4097      * @since 12
4098      */
4099     @Override
4100     public Optional<ClassDesc> describeConstable() {
4101         return Optional.of(ClassDesc.ofDescriptor(descriptorString()));
4102     }
4103 }
--- EOF ---