1 /* 2 * Copyright (c) 1994, 2016, 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.module.ModuleDescriptor.Version; 30 import java.lang.module.ModuleFinder; 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.Layer; 46 import java.lang.reflect.Member; 47 import java.lang.reflect.Method; 48 import java.lang.reflect.Modifier; 49 import java.lang.reflect.Module; 50 import java.lang.reflect.Proxy; 51 import java.lang.reflect.Type; 52 import java.lang.reflect.TypeVariable; 53 import java.net.URL; 54 import java.security.AccessController; 55 import java.security.PrivilegedAction; 56 import java.util.ArrayList; 57 import java.util.Arrays; 58 import java.util.Collection; 59 import java.util.HashMap; 60 import java.util.HashSet; 61 import java.util.LinkedHashMap; 62 import java.util.List; 63 import java.util.Map; 64 import java.util.Objects; 65 import java.util.Optional; 66 import java.util.Set; 67 import java.util.StringJoiner; 68 import java.util.stream.Collectors; 69 70 import jdk.internal.HotSpotIntrinsicCandidate; 71 import jdk.internal.loader.BootLoader; 72 import jdk.internal.loader.BuiltinClassLoader; 73 import jdk.internal.loader.ResourceHelper; 74 import jdk.internal.misc.SharedSecrets; 75 import jdk.internal.misc.Unsafe; 76 import jdk.internal.misc.VM; 77 import jdk.internal.module.ModuleHashes; 78 import jdk.internal.reflect.CallerSensitive; 79 import jdk.internal.reflect.ConstantPool; 80 import jdk.internal.reflect.Reflection; 81 import jdk.internal.reflect.ReflectionFactory; 82 import jdk.internal.vm.annotation.ForceInline; 83 import sun.reflect.generics.factory.CoreReflectionFactory; 84 import sun.reflect.generics.factory.GenericsFactory; 85 import sun.reflect.generics.repository.ClassRepository; 86 import sun.reflect.generics.repository.MethodRepository; 87 import sun.reflect.generics.repository.ConstructorRepository; 88 import sun.reflect.generics.scope.ClassScope; 89 import sun.security.util.SecurityConstants; 90 import sun.reflect.annotation.*; 91 import sun.reflect.misc.ReflectUtil; 92 93 /** 94 * Instances of the class {@code Class} represent classes and 95 * interfaces in a running Java application. An enum is a kind of 96 * class and an annotation is a kind of interface. Every array also 97 * belongs to a class that is reflected as a {@code Class} object 98 * that is shared by all arrays with the same element type and number 99 * of dimensions. The primitive Java types ({@code boolean}, 100 * {@code byte}, {@code char}, {@code short}, 101 * {@code int}, {@code long}, {@code float}, and 102 * {@code double}), and the keyword {@code void} are also 103 * represented as {@code Class} objects. 104 * 105 * <p> {@code Class} has no public constructor. Instead {@code Class} 106 * objects are constructed automatically by the Java Virtual Machine as classes 107 * are loaded and by calls to the {@code defineClass} method in the class 108 * loader. 109 * 110 * <p> The following example uses a {@code Class} object to print the 111 * class name of an object: 112 * 113 * <blockquote><pre> 114 * void printClassName(Object obj) { 115 * System.out.println("The class of " + obj + 116 * " is " + obj.getClass().getName()); 117 * } 118 * </pre></blockquote> 119 * 120 * <p> It is also possible to get the {@code Class} object for a named 121 * type (or for void) using a class literal. See Section 15.8.2 of 122 * <cite>The Java™ Language Specification</cite>. 123 * For example: 124 * 125 * <blockquote> 126 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} 127 * </blockquote> 128 * 129 * @param <T> the type of the class modeled by this {@code Class} 130 * object. For example, the type of {@code String.class} is {@code 131 * Class<String>}. Use {@code Class<?>} if the class being modeled is 132 * unknown. 133 * 134 * @author unascribed 135 * @see java.lang.ClassLoader#defineClass(byte[], int, int) 136 * @since 1.0 137 */ 138 public final class Class<T> implements java.io.Serializable, 139 GenericDeclaration, 140 Type, 141 AnnotatedElement { 142 private static final int ANNOTATION= 0x00002000; 143 private static final int ENUM = 0x00004000; 144 private static final int SYNTHETIC = 0x00001000; 145 146 private static native void registerNatives(); 147 static { 148 registerNatives(); 149 } 150 151 /* 152 * Private constructor. Only the Java Virtual Machine creates Class objects. 153 * This constructor is not used and prevents the default constructor being 154 * generated. 155 */ 156 private Class(ClassLoader loader, Class<?> arrayComponentType) { 157 // Initialize final field for classLoader. The initialization value of non-null 158 // prevents future JIT optimizations from assuming this final field is null. 159 classLoader = loader; 160 componentType = arrayComponentType; 161 } 162 163 /** 164 * Converts the object to a string. The string representation is the 165 * string "class" or "interface", followed by a space, and then by the 166 * fully qualified name of the class in the format returned by 167 * {@code getName}. If this {@code Class} object represents a 168 * primitive type, this method returns the name of the primitive type. If 169 * this {@code Class} object represents void this method returns 170 * "void". If this {@code Class} object represents an array type, 171 * this method returns "class " followed by {@code getName}. 172 * 173 * @return a string representation of this class object. 174 */ 175 public String toString() { 176 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) 177 + getName(); 178 } 179 180 /** 181 * Returns a string describing this {@code Class}, including 182 * information about modifiers and type parameters. 183 * 184 * The string is formatted as a list of type modifiers, if any, 185 * followed by the kind of type (empty string for primitive types 186 * and {@code class}, {@code enum}, {@code interface}, or 187 * <code>@</code>{@code interface}, as appropriate), followed 188 * by the type's name, followed by an angle-bracketed 189 * comma-separated list of the type's type parameters, if any. 190 * 191 * A space is used to separate modifiers from one another and to 192 * separate any modifiers from the kind of type. The modifiers 193 * occur in canonical order. If there are no type parameters, the 194 * type parameter list is elided. 195 * 196 * For an array type, the string starts with the type name, 197 * followed by an angle-bracketed comma-separated list of the 198 * type's type parameters, if any, followed by a sequence of 199 * {@code []} characters, one set of brackets per dimension of 200 * the array. 201 * 202 * <p>Note that since information about the runtime representation 203 * of a type is being generated, modifiers not present on the 204 * originating source code or illegal on the originating source 205 * code may be present. 206 * 207 * @return a string describing this {@code Class}, including 208 * information about modifiers and type parameters 209 * 210 * @since 1.8 211 */ 212 public String toGenericString() { 213 if (isPrimitive()) { 214 return toString(); 215 } else { 216 StringBuilder sb = new StringBuilder(); 217 Class<?> component = this; 218 int arrayDepth = 0; 219 220 if (isArray()) { 221 do { 222 arrayDepth++; 223 component = component.getComponentType(); 224 } while (component.isArray()); 225 sb.append(component.getName()); 226 } else { 227 // Class modifiers are a superset of interface modifiers 228 int modifiers = getModifiers() & Modifier.classModifiers(); 229 if (modifiers != 0) { 230 sb.append(Modifier.toString(modifiers)); 231 sb.append(' '); 232 } 233 234 if (isAnnotation()) { 235 sb.append('@'); 236 } 237 if (isInterface()) { // Note: all annotation types are interfaces 238 sb.append("interface"); 239 } else { 240 if (isEnum()) 241 sb.append("enum"); 242 else 243 sb.append("class"); 244 } 245 sb.append(' '); 246 sb.append(getName()); 247 } 248 249 TypeVariable<?>[] typeparms = component.getTypeParameters(); 250 if (typeparms.length > 0) { 251 StringJoiner sj = new StringJoiner(",", "<", ">"); 252 for(TypeVariable<?> typeparm: typeparms) { 253 sj.add(typeparm.getTypeName()); 254 } 255 sb.append(sj.toString()); 256 } 257 258 for (int i = 0; i < arrayDepth; i++) 259 sb.append("[]"); 260 261 return sb.toString(); 262 } 263 } 264 265 /** 266 * Returns the {@code Class} object associated with the class or 267 * interface with the given string name. Invoking this method is 268 * equivalent to: 269 * 270 * <blockquote> 271 * {@code Class.forName(className, true, currentLoader)} 272 * </blockquote> 273 * 274 * where {@code currentLoader} denotes the defining class loader of 275 * the current class. 276 * 277 * <p> For example, the following code fragment returns the 278 * runtime {@code Class} descriptor for the class named 279 * {@code java.lang.Thread}: 280 * 281 * <blockquote> 282 * {@code Class t = Class.forName("java.lang.Thread")} 283 * </blockquote> 284 * <p> 285 * A call to {@code forName("X")} causes the class named 286 * {@code X} to be initialized. 287 * 288 * @param className the fully qualified name of the desired class. 289 * @return the {@code Class} object for the class with the 290 * specified name. 291 * @exception LinkageError if the linkage fails 292 * @exception ExceptionInInitializerError if the initialization provoked 293 * by this method fails 294 * @exception ClassNotFoundException if the class cannot be located 295 */ 296 @CallerSensitive 297 public static Class<?> forName(String className) 298 throws ClassNotFoundException { 299 Class<?> caller = Reflection.getCallerClass(); 300 return forName0(className, true, ClassLoader.getClassLoader(caller), caller); 301 } 302 303 304 /** 305 * Returns the {@code Class} object associated with the class or 306 * interface with the given string name, using the given class loader. 307 * Given the fully qualified name for a class or interface (in the same 308 * format returned by {@code getName}) this method attempts to 309 * locate, load, and link the class or interface. The specified class 310 * loader is used to load the class or interface. If the parameter 311 * {@code loader} is null, the class is loaded through the bootstrap 312 * class loader. The class is initialized only if the 313 * {@code initialize} parameter is {@code true} and if it has 314 * not been initialized earlier. 315 * 316 * <p> If {@code name} denotes a primitive type or void, an attempt 317 * will be made to locate a user-defined class in the unnamed package whose 318 * name is {@code name}. Therefore, this method cannot be used to 319 * obtain any of the {@code Class} objects representing primitive 320 * types or void. 321 * 322 * <p> If {@code name} denotes an array class, the component type of 323 * the array class is loaded but not initialized. 324 * 325 * <p> For example, in an instance method the expression: 326 * 327 * <blockquote> 328 * {@code Class.forName("Foo")} 329 * </blockquote> 330 * 331 * is equivalent to: 332 * 333 * <blockquote> 334 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())} 335 * </blockquote> 336 * 337 * Note that this method throws errors related to loading, linking or 338 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The 339 * Java Language Specification</em>. 340 * Note that this method does not check whether the requested class 341 * is accessible to its caller. 342 * 343 * @param name fully qualified name of the desired class 344 * @param initialize if {@code true} the class will be initialized. 345 * See Section 12.4 of <em>The Java Language Specification</em>. 346 * @param loader class loader from which the class must be loaded 347 * @return class object representing the desired class 348 * 349 * @exception LinkageError if the linkage fails 350 * @exception ExceptionInInitializerError if the initialization provoked 351 * by this method fails 352 * @exception ClassNotFoundException if the class cannot be located by 353 * the specified class loader 354 * @exception SecurityException 355 * if a security manager is present, and the {@code loader} is 356 * {@code null}, and the caller's class loader is not 357 * {@code null}, and the caller does not have the 358 * {@link RuntimePermission}{@code ("getClassLoader")} 359 * 360 * @see java.lang.Class#forName(String) 361 * @see java.lang.ClassLoader 362 * @since 1.2 363 */ 364 @CallerSensitive 365 public static Class<?> forName(String name, boolean initialize, 366 ClassLoader loader) 367 throws ClassNotFoundException 368 { 369 Class<?> caller = null; 370 SecurityManager sm = System.getSecurityManager(); 371 if (sm != null) { 372 // Reflective call to get caller class is only needed if a security manager 373 // is present. Avoid the overhead of making this call otherwise. 374 caller = Reflection.getCallerClass(); 375 if (VM.isSystemDomainLoader(loader)) { 376 ClassLoader ccl = ClassLoader.getClassLoader(caller); 377 if (!VM.isSystemDomainLoader(ccl)) { 378 sm.checkPermission( 379 SecurityConstants.GET_CLASSLOADER_PERMISSION); 380 } 381 } 382 } 383 return forName0(name, initialize, loader, caller); 384 } 385 386 /** Called after security check for system loader access checks have been made. */ 387 private static native Class<?> forName0(String name, boolean initialize, 388 ClassLoader loader, 389 Class<?> caller) 390 throws ClassNotFoundException; 391 392 393 /** 394 * Returns the {@code Class} with the given <a href="ClassLoader.html#name"> 395 * binary name</a> in the given module. 396 * 397 * <p> This method attempts to locate, load, and link the class or interface. 398 * It does not run the class initializer. If the class is not found, this 399 * method returns {@code null}. </p> 400 * 401 * <p> If the class loader of the given module defines other modules and 402 * the given name is a class defined in a different module, this method 403 * returns {@code null} after the class is loaded. </p> 404 * 405 * <p> This method does not check whether the requested class is 406 * accessible to its caller. </p> 407 * 408 * @apiNote 409 * This method returns {@code null} on failure rather than 410 * throwing a {@link ClassNotFoundException}, as is done by 411 * the {@link #forName(String, boolean, ClassLoader)} method. 412 * The security check is a stack-based permission check if the caller 413 * loads a class in another module. 414 * 415 * @param module A module 416 * @param name The <a href="ClassLoader.html#name">binary name</a> 417 * of the class 418 * @return {@code Class} object of the given name defined in the given module; 419 * {@code null} if not found. 420 * 421 * @throws NullPointerException if the given module or name is {@code null} 422 * 423 * @throws LinkageError if the linkage fails 424 * 425 * @throws SecurityException 426 * <ul> 427 * <li> if the caller is not the specified module and 428 * {@code RuntimePermission("getClassLoader")} permission is denied; or</li> 429 * <li> access to the module content is denied. For example, 430 * permission check will be performed when a class loader calls 431 * {@link ModuleReader#open(String)} to read the bytes of a class file 432 * in a module.</li> 433 * </ul> 434 * 435 * @since 9 436 */ 437 @CallerSensitive 438 public static Class<?> forName(Module module, String name) { 439 Objects.requireNonNull(module); 440 Objects.requireNonNull(name); 441 442 Class<?> caller = Reflection.getCallerClass(); 443 if (caller != null && caller.getModule() != module) { 444 // if caller is null, Class.forName is the last java frame on the stack. 445 // java.base has all permissions 446 SecurityManager sm = System.getSecurityManager(); 447 if (sm != null) { 448 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); 449 } 450 } 451 452 PrivilegedAction<ClassLoader> pa = module::getClassLoader; 453 ClassLoader cl = AccessController.doPrivileged(pa); 454 if (cl != null) { 455 return cl.loadClass(module, name); 456 } else { 457 return BootLoader.loadClass(module, name); 458 } 459 } 460 461 /** 462 * Creates a new instance of the class represented by this {@code Class} 463 * object. The class is instantiated as if by a {@code new} 464 * expression with an empty argument list. The class is initialized if it 465 * has not already been initialized. 466 * 467 * @deprecated This method propagates any exception thrown by the 468 * nullary constructor, including a checked exception. Use of 469 * this method effectively bypasses the compile-time exception 470 * checking that would otherwise be performed by the compiler. 471 * The {@link 472 * java.lang.reflect.Constructor#newInstance(java.lang.Object...) 473 * Constructor.newInstance} method avoids this problem by wrapping 474 * any exception thrown by the constructor in a (checked) {@link 475 * java.lang.reflect.InvocationTargetException}. 476 * 477 * <p>The call 478 * 479 * <pre>{@code 480 * clazz.newInstance() 481 * }</pre> 482 * 483 * can be replaced by 484 * 485 * <pre>{@code 486 * clazz.getDeclaredConstructor().newInstance() 487 * }</pre> 488 * 489 * The latter sequence of calls is inferred to be able to throw 490 * the additional exception types {@link 491 * InvocationTargetException} and {@link 492 * NoSuchMethodException}. Both of these exception types are 493 * subclasses of {@link ReflectiveOperationException}. 494 * 495 * @return a newly allocated instance of the class represented by this 496 * object. 497 * @throws IllegalAccessException if the class or its nullary 498 * constructor is not accessible. 499 * @throws InstantiationException 500 * if this {@code Class} represents an abstract class, 501 * an interface, an array class, a primitive type, or void; 502 * or if the class has no nullary constructor; 503 * or if the instantiation fails for some other reason. 504 * @throws ExceptionInInitializerError if the initialization 505 * provoked by this method fails. 506 * @throws SecurityException 507 * If a security manager, <i>s</i>, is present and 508 * the caller's class loader is not the same as or an 509 * ancestor of the class loader for the current class and 510 * invocation of {@link SecurityManager#checkPackageAccess 511 * s.checkPackageAccess()} denies access to the package 512 * of this class. 513 */ 514 @CallerSensitive 515 @Deprecated(since="9") 516 public T newInstance() 517 throws InstantiationException, IllegalAccessException 518 { 519 if (System.getSecurityManager() != null) { 520 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false); 521 } 522 523 // NOTE: the following code may not be strictly correct under 524 // the current Java memory model. 525 526 // Constructor lookup 527 if (cachedConstructor == null) { 528 if (this == Class.class) { 529 throw new IllegalAccessException( 530 "Can not call newInstance() on the Class for java.lang.Class" 531 ); 532 } 533 try { 534 Class<?>[] empty = {}; 535 final Constructor<T> c = getConstructor0(empty, Member.DECLARED); 536 // Disable accessibility checks on the constructor 537 // since we have to do the security check here anyway 538 // (the stack depth is wrong for the Constructor's 539 // security check to work) 540 java.security.AccessController.doPrivileged( 541 new java.security.PrivilegedAction<>() { 542 public Void run() { 543 c.setAccessible(true); 544 return null; 545 } 546 }); 547 cachedConstructor = c; 548 } catch (NoSuchMethodException e) { 549 throw (InstantiationException) 550 new InstantiationException(getName()).initCause(e); 551 } 552 } 553 Constructor<T> tmpConstructor = cachedConstructor; 554 // Security check (same as in java.lang.reflect.Constructor) 555 Class<?> caller = Reflection.getCallerClass(); 556 if (newInstanceCallerCache != caller) { 557 int modifiers = tmpConstructor.getModifiers(); 558 Reflection.ensureMemberAccess(caller, this, this, modifiers); 559 newInstanceCallerCache = caller; 560 } 561 // Run constructor 562 try { 563 return tmpConstructor.newInstance((Object[])null); 564 } catch (InvocationTargetException e) { 565 Unsafe.getUnsafe().throwException(e.getTargetException()); 566 // Not reached 567 return null; 568 } 569 } 570 private transient volatile Constructor<T> cachedConstructor; 571 private transient volatile Class<?> newInstanceCallerCache; 572 573 574 /** 575 * Determines if the specified {@code Object} is assignment-compatible 576 * with the object represented by this {@code Class}. This method is 577 * the dynamic equivalent of the Java language {@code instanceof} 578 * operator. The method returns {@code true} if the specified 579 * {@code Object} argument is non-null and can be cast to the 580 * reference type represented by this {@code Class} object without 581 * raising a {@code ClassCastException.} It returns {@code false} 582 * otherwise. 583 * 584 * <p> Specifically, if this {@code Class} object represents a 585 * declared class, this method returns {@code true} if the specified 586 * {@code Object} argument is an instance of the represented class (or 587 * of any of its subclasses); it returns {@code false} otherwise. If 588 * this {@code Class} object represents an array class, this method 589 * returns {@code true} if the specified {@code Object} argument 590 * can be converted to an object of the array class by an identity 591 * conversion or by a widening reference conversion; it returns 592 * {@code false} otherwise. If this {@code Class} object 593 * represents an interface, this method returns {@code true} if the 594 * class or any superclass of the specified {@code Object} argument 595 * implements this interface; it returns {@code false} otherwise. If 596 * this {@code Class} object represents a primitive type, this method 597 * returns {@code false}. 598 * 599 * @param obj the object to check 600 * @return true if {@code obj} is an instance of this class 601 * 602 * @since 1.1 603 */ 604 @HotSpotIntrinsicCandidate 605 public native boolean isInstance(Object obj); 606 607 608 /** 609 * Determines if the class or interface represented by this 610 * {@code Class} object is either the same as, or is a superclass or 611 * superinterface of, the class or interface represented by the specified 612 * {@code Class} parameter. It returns {@code true} if so; 613 * otherwise it returns {@code false}. If this {@code Class} 614 * object represents a primitive type, this method returns 615 * {@code true} if the specified {@code Class} parameter is 616 * exactly this {@code Class} object; otherwise it returns 617 * {@code false}. 618 * 619 * <p> Specifically, this method tests whether the type represented by the 620 * specified {@code Class} parameter can be converted to the type 621 * represented by this {@code Class} object via an identity conversion 622 * or via a widening reference conversion. See <em>The Java Language 623 * Specification</em>, sections 5.1.1 and 5.1.4 , for details. 624 * 625 * @param cls the {@code Class} object to be checked 626 * @return the {@code boolean} value indicating whether objects of the 627 * type {@code cls} can be assigned to objects of this class 628 * @exception NullPointerException if the specified Class parameter is 629 * null. 630 * @since 1.1 631 */ 632 @HotSpotIntrinsicCandidate 633 public native boolean isAssignableFrom(Class<?> cls); 634 635 636 /** 637 * Determines if the specified {@code Class} object represents an 638 * interface type. 639 * 640 * @return {@code true} if this object represents an interface; 641 * {@code false} otherwise. 642 */ 643 @HotSpotIntrinsicCandidate 644 public native boolean isInterface(); 645 646 647 /** 648 * Determines if this {@code Class} object represents an array class. 649 * 650 * @return {@code true} if this object represents an array class; 651 * {@code false} otherwise. 652 * @since 1.1 653 */ 654 @HotSpotIntrinsicCandidate 655 public native boolean isArray(); 656 657 658 /** 659 * Determines if the specified {@code Class} object represents a 660 * primitive type. 661 * 662 * <p> There are nine predefined {@code Class} objects to represent 663 * the eight primitive types and void. These are created by the Java 664 * Virtual Machine, and have the same names as the primitive types that 665 * they represent, namely {@code boolean}, {@code byte}, 666 * {@code char}, {@code short}, {@code int}, 667 * {@code long}, {@code float}, and {@code double}. 668 * 669 * <p> These objects may only be accessed via the following public static 670 * final variables, and are the only {@code Class} objects for which 671 * this method returns {@code true}. 672 * 673 * @return true if and only if this class represents a primitive type 674 * 675 * @see java.lang.Boolean#TYPE 676 * @see java.lang.Character#TYPE 677 * @see java.lang.Byte#TYPE 678 * @see java.lang.Short#TYPE 679 * @see java.lang.Integer#TYPE 680 * @see java.lang.Long#TYPE 681 * @see java.lang.Float#TYPE 682 * @see java.lang.Double#TYPE 683 * @see java.lang.Void#TYPE 684 * @since 1.1 685 */ 686 @HotSpotIntrinsicCandidate 687 public native boolean isPrimitive(); 688 689 /** 690 * Returns true if this {@code Class} object represents an annotation 691 * type. Note that if this method returns true, {@link #isInterface()} 692 * would also return true, as all annotation types are also interfaces. 693 * 694 * @return {@code true} if this class object represents an annotation 695 * type; {@code false} otherwise 696 * @since 1.5 697 */ 698 public boolean isAnnotation() { 699 return (getModifiers() & ANNOTATION) != 0; 700 } 701 702 /** 703 * Returns {@code true} if this class is a synthetic class; 704 * returns {@code false} otherwise. 705 * @return {@code true} if and only if this class is a synthetic class as 706 * defined by the Java Language Specification. 707 * @jls 13.1 The Form of a Binary 708 * @since 1.5 709 */ 710 public boolean isSynthetic() { 711 return (getModifiers() & SYNTHETIC) != 0; 712 } 713 714 /** 715 * Returns the name of the entity (class, interface, array class, 716 * primitive type, or void) represented by this {@code Class} object, 717 * as a {@code String}. 718 * 719 * <p> If this class object represents a reference type that is not an 720 * array type then the binary name of the class is returned, as specified 721 * by 722 * <cite>The Java™ Language Specification</cite>. 723 * 724 * <p> If this class object represents a primitive type or void, then the 725 * name returned is a {@code String} equal to the Java language 726 * keyword corresponding to the primitive type or void. 727 * 728 * <p> If this class object represents a class of arrays, then the internal 729 * form of the name consists of the name of the element type preceded by 730 * one or more '{@code [}' characters representing the depth of the array 731 * nesting. The encoding of element type names is as follows: 732 * 733 * <blockquote><table summary="Element types and encodings"> 734 * <tr><th> Element Type <th> <th> Encoding 735 * <tr><td> boolean <td> <td align=center> Z 736 * <tr><td> byte <td> <td align=center> B 737 * <tr><td> char <td> <td align=center> C 738 * <tr><td> class or interface 739 * <td> <td align=center> L<i>classname</i>; 740 * <tr><td> double <td> <td align=center> D 741 * <tr><td> float <td> <td align=center> F 742 * <tr><td> int <td> <td align=center> I 743 * <tr><td> long <td> <td align=center> J 744 * <tr><td> short <td> <td align=center> S 745 * </table></blockquote> 746 * 747 * <p> The class or interface name <i>classname</i> is the binary name of 748 * the class specified above. 749 * 750 * <p> Examples: 751 * <blockquote><pre> 752 * String.class.getName() 753 * returns "java.lang.String" 754 * byte.class.getName() 755 * returns "byte" 756 * (new Object[3]).getClass().getName() 757 * returns "[Ljava.lang.Object;" 758 * (new int[3][4][5][6][7][8][9]).getClass().getName() 759 * returns "[[[[[[[I" 760 * </pre></blockquote> 761 * 762 * @return the name of the class or interface 763 * represented by this object. 764 */ 765 public String getName() { 766 String name = this.name; 767 if (name == null) 768 this.name = name = getName0(); 769 return name; 770 } 771 772 // cache the name to reduce the number of calls into the VM 773 private transient String name; 774 private native String getName0(); 775 776 /** 777 * Returns the class loader for the class. Some implementations may use 778 * null to represent the bootstrap class loader. This method will return 779 * null in such implementations if this class was loaded by the bootstrap 780 * class loader. 781 * 782 * <p>If this object 783 * represents a primitive type or void, null is returned. 784 * 785 * @return the class loader that loaded the class or interface 786 * represented by this object. 787 * @throws SecurityException 788 * if a security manager is present, and the caller's class loader 789 * is not {@code null} and is not the same as or an ancestor of the 790 * class loader for the class whose class loader is requested, 791 * and the caller does not have the 792 * {@link RuntimePermission}{@code ("getClassLoader")} 793 * @see java.lang.ClassLoader 794 * @see SecurityManager#checkPermission 795 * @see java.lang.RuntimePermission 796 */ 797 @CallerSensitive 798 @ForceInline // to ensure Reflection.getCallerClass optimization 799 public ClassLoader getClassLoader() { 800 ClassLoader cl = getClassLoader0(); 801 if (cl == null) 802 return null; 803 SecurityManager sm = System.getSecurityManager(); 804 if (sm != null) { 805 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass()); 806 } 807 return cl; 808 } 809 810 // Package-private to allow ClassLoader access 811 ClassLoader getClassLoader0() { return classLoader; } 812 813 /** 814 * Returns the module that this class or interface is a member of. 815 * 816 * If this class represents an array type then this method returns the 817 * {@code Module} for the element type. If this class represents a 818 * primitive type or void, then the {@code Module} object for the 819 * {@code java.base} module is returned. 820 * 821 * If this class is in an unnamed module then the {@link 822 * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class 823 * loader for this class is returned. 824 * 825 * @return the module that this class or interface is a member of 826 * 827 * @since 9 828 */ 829 public Module getModule() { 830 return module; 831 } 832 833 // set by VM 834 private transient Module module; 835 836 // Initialized in JVM not by private constructor 837 // This field is filtered from reflection access, i.e. getDeclaredField 838 // will throw NoSuchFieldException 839 private final ClassLoader classLoader; 840 841 /** 842 * Returns an array of {@code TypeVariable} objects that represent the 843 * type variables declared by the generic declaration represented by this 844 * {@code GenericDeclaration} object, in declaration order. Returns an 845 * array of length 0 if the underlying generic declaration declares no type 846 * variables. 847 * 848 * @return an array of {@code TypeVariable} objects that represent 849 * the type variables declared by this generic declaration 850 * @throws java.lang.reflect.GenericSignatureFormatError if the generic 851 * signature of this generic declaration does not conform to 852 * the format specified in 853 * <cite>The Java™ Virtual Machine Specification</cite> 854 * @since 1.5 855 */ 856 @SuppressWarnings("unchecked") 857 public TypeVariable<Class<T>>[] getTypeParameters() { 858 ClassRepository info = getGenericInfo(); 859 if (info != null) 860 return (TypeVariable<Class<T>>[])info.getTypeParameters(); 861 else 862 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0]; 863 } 864 865 866 /** 867 * Returns the {@code Class} representing the direct superclass of the 868 * entity (class, interface, primitive type or void) represented by 869 * this {@code Class}. If this {@code Class} represents either the 870 * {@code Object} class, an interface, a primitive type, or void, then 871 * null is returned. If this object represents an array class then the 872 * {@code Class} object representing the {@code Object} class is 873 * returned. 874 * 875 * @return the direct superclass of the class represented by this object 876 */ 877 @HotSpotIntrinsicCandidate 878 public native Class<? super T> getSuperclass(); 879 880 881 /** 882 * Returns the {@code Type} representing the direct superclass of 883 * the entity (class, interface, primitive type or void) represented by 884 * this {@code Class}. 885 * 886 * <p>If the superclass is a parameterized type, the {@code Type} 887 * object returned must accurately reflect the actual type 888 * parameters used in the source code. The parameterized type 889 * representing the superclass is created if it had not been 890 * created before. See the declaration of {@link 891 * java.lang.reflect.ParameterizedType ParameterizedType} for the 892 * semantics of the creation process for parameterized types. If 893 * this {@code Class} represents either the {@code Object} 894 * class, an interface, a primitive type, or void, then null is 895 * returned. If this object represents an array class then the 896 * {@code Class} object representing the {@code Object} class is 897 * returned. 898 * 899 * @throws java.lang.reflect.GenericSignatureFormatError if the generic 900 * class signature does not conform to the format specified in 901 * <cite>The Java™ Virtual Machine Specification</cite> 902 * @throws TypeNotPresentException if the generic superclass 903 * refers to a non-existent type declaration 904 * @throws java.lang.reflect.MalformedParameterizedTypeException if the 905 * generic superclass refers to a parameterized type that cannot be 906 * instantiated for any reason 907 * @return the direct superclass of the class represented by this object 908 * @since 1.5 909 */ 910 public Type getGenericSuperclass() { 911 ClassRepository info = getGenericInfo(); 912 if (info == null) { 913 return getSuperclass(); 914 } 915 916 // Historical irregularity: 917 // Generic signature marks interfaces with superclass = Object 918 // but this API returns null for interfaces 919 if (isInterface()) { 920 return null; 921 } 922 923 return info.getSuperclass(); 924 } 925 926 /** 927 * Gets the package of this class. 928 * 929 * <p>If this class represents an array type, a primitive type or void, 930 * this method returns {@code null}. 931 * 932 * @return the package of this class. 933 */ 934 public Package getPackage() { 935 if (isPrimitive() || isArray()) { 936 return null; 937 } 938 ClassLoader cl = getClassLoader0(); 939 return cl != null ? cl.definePackage(this) 940 : BootLoader.definePackage(this); 941 } 942 943 /** 944 * Returns the fully qualified package name. 945 * 946 * <p> If this class is a top level class, then this method returns the fully 947 * qualified name of the package that the class is a member of, or the 948 * empty string if the class is in an unnamed package. 949 * 950 * <p> If this class is a member class, then this method is equivalent to 951 * invoking {@code getPackageName()} on the {@link #getEnclosingClass 952 * enclosing class}. 953 * 954 * <p> If this class is a {@link #isLocalClass local class} or an {@link 955 * #isAnonymousClass() anonymous class}, then this method is equivalent to 956 * invoking {@code getPackageName()} on the {@link #getDeclaringClass 957 * declaring class} of the {@link #getEnclosingMethod enclosing method} or 958 * {@link #getEnclosingConstructor enclosing constructor}. 959 * 960 * <p> This method returns {@code null} if this class represents an array type, 961 * a primitive type or void. 962 * 963 * @return the fully qualified package name 964 * 965 * @since 9 966 * @jls 6.7 Fully Qualified Names 967 */ 968 public String getPackageName() { 969 String pn = this.packageName; 970 if (pn == null && !isArray() && !isPrimitive()) { 971 String cn = getName(); 972 int dot = cn.lastIndexOf('.'); 973 pn = (dot != -1) ? cn.substring(0, dot).intern() : ""; 974 this.packageName = pn; 975 } 976 return pn; 977 } 978 979 // cached package name 980 private transient String packageName; 981 982 /** 983 * Returns the interfaces directly implemented by the class or interface 984 * represented by this object. 985 * 986 * <p>If this object represents a class, the return value is an array 987 * containing objects representing all interfaces directly implemented by 988 * the class. The order of the interface objects in the array corresponds 989 * to the order of the interface names in the {@code implements} clause of 990 * the declaration of the class represented by this object. For example, 991 * given the declaration: 992 * <blockquote> 993 * {@code class Shimmer implements FloorWax, DessertTopping { ... }} 994 * </blockquote> 995 * suppose the value of {@code s} is an instance of 996 * {@code Shimmer}; the value of the expression: 997 * <blockquote> 998 * {@code s.getClass().getInterfaces()[0]} 999 * </blockquote> 1000 * is the {@code Class} object that represents interface 1001 * {@code FloorWax}; and the value of: 1002 * <blockquote> 1003 * {@code s.getClass().getInterfaces()[1]} 1004 * </blockquote> 1005 * is the {@code Class} object that represents interface 1006 * {@code DessertTopping}. 1007 * 1008 * <p>If this object represents an interface, the array contains objects 1009 * representing all interfaces directly extended by the interface. The 1010 * order of the interface objects in the array corresponds to the order of 1011 * the interface names in the {@code extends} clause of the declaration of 1012 * the interface represented by this object. 1013 * 1014 * <p>If this object represents a class or interface that implements no 1015 * interfaces, the method returns an array of length 0. 1016 * 1017 * <p>If this object represents a primitive type or void, the method 1018 * returns an array of length 0. 1019 * 1020 * <p>If this {@code Class} object represents an array type, the 1021 * interfaces {@code Cloneable} and {@code java.io.Serializable} are 1022 * returned in that order. 1023 * 1024 * @return an array of interfaces directly implemented by this class 1025 */ 1026 public Class<?>[] getInterfaces() { 1027 ReflectionData<T> rd = reflectionData(); 1028 if (rd == null) { 1029 // no cloning required 1030 return getInterfaces0(); 1031 } else { 1032 Class<?>[] interfaces = rd.interfaces; 1033 if (interfaces == null) { 1034 interfaces = getInterfaces0(); 1035 rd.interfaces = interfaces; 1036 } 1037 // defensively copy before handing over to user code 1038 return interfaces.clone(); 1039 } 1040 } 1041 1042 private native Class<?>[] getInterfaces0(); 1043 1044 /** 1045 * Returns the {@code Type}s representing the interfaces 1046 * directly implemented by the class or interface represented by 1047 * this object. 1048 * 1049 * <p>If a superinterface is a parameterized type, the 1050 * {@code Type} object returned for it must accurately reflect 1051 * the actual type parameters used in the source code. The 1052 * parameterized type representing each superinterface is created 1053 * if it had not been created before. See the declaration of 1054 * {@link java.lang.reflect.ParameterizedType ParameterizedType} 1055 * for the semantics of the creation process for parameterized 1056 * types. 1057 * 1058 * <p>If this object represents a class, the return value is an array 1059 * containing objects representing all interfaces directly implemented by 1060 * the class. The order of the interface objects in the array corresponds 1061 * to the order of the interface names in the {@code implements} clause of 1062 * the declaration of the class represented by this object. 1063 * 1064 * <p>If this object represents an interface, the array contains objects 1065 * representing all interfaces directly extended by the interface. The 1066 * order of the interface objects in the array corresponds to the order of 1067 * the interface names in the {@code extends} clause of the declaration of 1068 * the interface represented by this object. 1069 * 1070 * <p>If this object represents a class or interface that implements no 1071 * interfaces, the method returns an array of length 0. 1072 * 1073 * <p>If this object represents a primitive type or void, the method 1074 * returns an array of length 0. 1075 * 1076 * <p>If this {@code Class} object represents an array type, the 1077 * interfaces {@code Cloneable} and {@code java.io.Serializable} are 1078 * returned in that order. 1079 * 1080 * @throws java.lang.reflect.GenericSignatureFormatError 1081 * if the generic class signature does not conform to the format 1082 * specified in 1083 * <cite>The Java™ Virtual Machine Specification</cite> 1084 * @throws TypeNotPresentException if any of the generic 1085 * superinterfaces refers to a non-existent type declaration 1086 * @throws java.lang.reflect.MalformedParameterizedTypeException 1087 * if any of the generic superinterfaces refer to a parameterized 1088 * type that cannot be instantiated for any reason 1089 * @return an array of interfaces directly implemented by this class 1090 * @since 1.5 1091 */ 1092 public Type[] getGenericInterfaces() { 1093 ClassRepository info = getGenericInfo(); 1094 return (info == null) ? getInterfaces() : info.getSuperInterfaces(); 1095 } 1096 1097 1098 /** 1099 * Returns the {@code Class} representing the component type of an 1100 * array. If this class does not represent an array class this method 1101 * returns null. 1102 * 1103 * @return the {@code Class} representing the component type of this 1104 * class if this class is an array 1105 * @see java.lang.reflect.Array 1106 * @since 1.1 1107 */ 1108 public Class<?> getComponentType() { 1109 // Only return for array types. Storage may be reused for Class for instance types. 1110 if (isArray()) { 1111 return componentType; 1112 } else { 1113 return null; 1114 } 1115 } 1116 1117 private final Class<?> componentType; 1118 1119 1120 /** 1121 * Returns the Java language modifiers for this class or interface, encoded 1122 * in an integer. The modifiers consist of the Java Virtual Machine's 1123 * constants for {@code public}, {@code protected}, 1124 * {@code private}, {@code final}, {@code static}, 1125 * {@code abstract} and {@code interface}; they should be decoded 1126 * using the methods of class {@code Modifier}. 1127 * 1128 * <p> If the underlying class is an array class, then its 1129 * {@code public}, {@code private} and {@code protected} 1130 * modifiers are the same as those of its component type. If this 1131 * {@code Class} represents a primitive type or void, its 1132 * {@code public} modifier is always {@code true}, and its 1133 * {@code protected} and {@code private} modifiers are always 1134 * {@code false}. If this object represents an array class, a 1135 * primitive type or void, then its {@code final} modifier is always 1136 * {@code true} and its interface modifier is always 1137 * {@code false}. The values of its other modifiers are not determined 1138 * by this specification. 1139 * 1140 * <p> The modifier encodings are defined in <em>The Java Virtual Machine 1141 * Specification</em>, table 4.1. 1142 * 1143 * @return the {@code int} representing the modifiers for this class 1144 * @see java.lang.reflect.Modifier 1145 * @since 1.1 1146 */ 1147 @HotSpotIntrinsicCandidate 1148 public native int getModifiers(); 1149 1150 1151 /** 1152 * Gets the signers of this class. 1153 * 1154 * @return the signers of this class, or null if there are no signers. In 1155 * particular, this method returns null if this object represents 1156 * a primitive type or void. 1157 * @since 1.1 1158 */ 1159 public native Object[] getSigners(); 1160 1161 1162 /** 1163 * Set the signers of this class. 1164 */ 1165 native void setSigners(Object[] signers); 1166 1167 1168 /** 1169 * If this {@code Class} object represents a local or anonymous 1170 * class within a method, returns a {@link 1171 * java.lang.reflect.Method Method} object representing the 1172 * immediately enclosing method of the underlying class. Returns 1173 * {@code null} otherwise. 1174 * 1175 * In particular, this method returns {@code null} if the underlying 1176 * class is a local or anonymous class immediately enclosed by a type 1177 * declaration, instance initializer or static initializer. 1178 * 1179 * @return the immediately enclosing method of the underlying class, if 1180 * that class is a local or anonymous class; otherwise {@code null}. 1181 * 1182 * @throws SecurityException 1183 * If a security manager, <i>s</i>, is present and any of the 1184 * following conditions is met: 1185 * 1186 * <ul> 1187 * 1188 * <li> the caller's class loader is not the same as the 1189 * class loader of the enclosing class and invocation of 1190 * {@link SecurityManager#checkPermission 1191 * s.checkPermission} method with 1192 * {@code RuntimePermission("accessDeclaredMembers")} 1193 * denies access to the methods within the enclosing class 1194 * 1195 * <li> the caller's class loader is not the same as or an 1196 * ancestor of the class loader for the enclosing class and 1197 * invocation of {@link SecurityManager#checkPackageAccess 1198 * s.checkPackageAccess()} denies access to the package 1199 * of the enclosing class 1200 * 1201 * </ul> 1202 * @since 1.5 1203 */ 1204 @CallerSensitive 1205 public Method getEnclosingMethod() throws SecurityException { 1206 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1207 1208 if (enclosingInfo == null) 1209 return null; 1210 else { 1211 if (!enclosingInfo.isMethod()) 1212 return null; 1213 1214 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(), 1215 getFactory()); 1216 Class<?> returnType = toClass(typeInfo.getReturnType()); 1217 Type [] parameterTypes = typeInfo.getParameterTypes(); 1218 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; 1219 1220 // Convert Types to Classes; returned types *should* 1221 // be class objects since the methodDescriptor's used 1222 // don't have generics information 1223 for(int i = 0; i < parameterClasses.length; i++) 1224 parameterClasses[i] = toClass(parameterTypes[i]); 1225 1226 // Perform access check 1227 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass(); 1228 enclosingCandidate.checkMemberAccess(Member.DECLARED, 1229 Reflection.getCallerClass(), true); 1230 // Client is ok to access declared methods but j.l.Class might not be. 1231 Method[] candidates = AccessController.doPrivileged( 1232 new PrivilegedAction<>() { 1233 @Override 1234 public Method[] run() { 1235 return enclosingCandidate.getDeclaredMethods(); 1236 } 1237 }); 1238 /* 1239 * Loop over all declared methods; match method name, 1240 * number of and type of parameters, *and* return 1241 * type. Matching return type is also necessary 1242 * because of covariant returns, etc. 1243 */ 1244 for(Method m: candidates) { 1245 if (m.getName().equals(enclosingInfo.getName()) ) { 1246 Class<?>[] candidateParamClasses = m.getParameterTypes(); 1247 if (candidateParamClasses.length == parameterClasses.length) { 1248 boolean matches = true; 1249 for(int i = 0; i < candidateParamClasses.length; i++) { 1250 if (!candidateParamClasses[i].equals(parameterClasses[i])) { 1251 matches = false; 1252 break; 1253 } 1254 } 1255 1256 if (matches) { // finally, check return type 1257 if (m.getReturnType().equals(returnType) ) 1258 return m; 1259 } 1260 } 1261 } 1262 } 1263 1264 throw new InternalError("Enclosing method not found"); 1265 } 1266 } 1267 1268 private native Object[] getEnclosingMethod0(); 1269 1270 private EnclosingMethodInfo getEnclosingMethodInfo() { 1271 Object[] enclosingInfo = getEnclosingMethod0(); 1272 if (enclosingInfo == null) 1273 return null; 1274 else { 1275 return new EnclosingMethodInfo(enclosingInfo); 1276 } 1277 } 1278 1279 private static final class EnclosingMethodInfo { 1280 private Class<?> enclosingClass; 1281 private String name; 1282 private String descriptor; 1283 1284 private EnclosingMethodInfo(Object[] enclosingInfo) { 1285 if (enclosingInfo.length != 3) 1286 throw new InternalError("Malformed enclosing method information"); 1287 try { 1288 // The array is expected to have three elements: 1289 1290 // the immediately enclosing class 1291 enclosingClass = (Class<?>) enclosingInfo[0]; 1292 assert(enclosingClass != null); 1293 1294 // the immediately enclosing method or constructor's 1295 // name (can be null). 1296 name = (String) enclosingInfo[1]; 1297 1298 // the immediately enclosing method or constructor's 1299 // descriptor (null iff name is). 1300 descriptor = (String) enclosingInfo[2]; 1301 assert((name != null && descriptor != null) || name == descriptor); 1302 } catch (ClassCastException cce) { 1303 throw new InternalError("Invalid type in enclosing method information", cce); 1304 } 1305 } 1306 1307 boolean isPartial() { 1308 return enclosingClass == null || name == null || descriptor == null; 1309 } 1310 1311 boolean isConstructor() { return !isPartial() && "<init>".equals(name); } 1312 1313 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); } 1314 1315 Class<?> getEnclosingClass() { return enclosingClass; } 1316 1317 String getName() { return name; } 1318 1319 String getDescriptor() { return descriptor; } 1320 1321 } 1322 1323 private static Class<?> toClass(Type o) { 1324 if (o instanceof GenericArrayType) 1325 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()), 1326 0) 1327 .getClass(); 1328 return (Class<?>)o; 1329 } 1330 1331 /** 1332 * If this {@code Class} object represents a local or anonymous 1333 * class within a constructor, returns a {@link 1334 * java.lang.reflect.Constructor Constructor} object representing 1335 * the immediately enclosing constructor of the underlying 1336 * class. Returns {@code null} otherwise. In particular, this 1337 * method returns {@code null} if the underlying class is a local 1338 * or anonymous class immediately enclosed by a type declaration, 1339 * instance initializer or static initializer. 1340 * 1341 * @return the immediately enclosing constructor of the underlying class, if 1342 * that class is a local or anonymous class; otherwise {@code null}. 1343 * @throws SecurityException 1344 * If a security manager, <i>s</i>, is present and any of the 1345 * following conditions is met: 1346 * 1347 * <ul> 1348 * 1349 * <li> the caller's class loader is not the same as the 1350 * class loader of the enclosing class and invocation of 1351 * {@link SecurityManager#checkPermission 1352 * s.checkPermission} method with 1353 * {@code RuntimePermission("accessDeclaredMembers")} 1354 * denies access to the constructors within the enclosing class 1355 * 1356 * <li> the caller's class loader is not the same as or an 1357 * ancestor of the class loader for the enclosing class and 1358 * invocation of {@link SecurityManager#checkPackageAccess 1359 * s.checkPackageAccess()} denies access to the package 1360 * of the enclosing class 1361 * 1362 * </ul> 1363 * @since 1.5 1364 */ 1365 @CallerSensitive 1366 public Constructor<?> getEnclosingConstructor() throws SecurityException { 1367 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1368 1369 if (enclosingInfo == null) 1370 return null; 1371 else { 1372 if (!enclosingInfo.isConstructor()) 1373 return null; 1374 1375 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(), 1376 getFactory()); 1377 Type [] parameterTypes = typeInfo.getParameterTypes(); 1378 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; 1379 1380 // Convert Types to Classes; returned types *should* 1381 // be class objects since the methodDescriptor's used 1382 // don't have generics information 1383 for(int i = 0; i < parameterClasses.length; i++) 1384 parameterClasses[i] = toClass(parameterTypes[i]); 1385 1386 // Perform access check 1387 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass(); 1388 enclosingCandidate.checkMemberAccess(Member.DECLARED, 1389 Reflection.getCallerClass(), true); 1390 // Client is ok to access declared methods but j.l.Class might not be. 1391 Constructor<?>[] candidates = AccessController.doPrivileged( 1392 new PrivilegedAction<>() { 1393 @Override 1394 public Constructor<?>[] run() { 1395 return enclosingCandidate.getDeclaredConstructors(); 1396 } 1397 }); 1398 /* 1399 * Loop over all declared constructors; match number 1400 * of and type of parameters. 1401 */ 1402 for(Constructor<?> c: candidates) { 1403 Class<?>[] candidateParamClasses = c.getParameterTypes(); 1404 if (candidateParamClasses.length == parameterClasses.length) { 1405 boolean matches = true; 1406 for(int i = 0; i < candidateParamClasses.length; i++) { 1407 if (!candidateParamClasses[i].equals(parameterClasses[i])) { 1408 matches = false; 1409 break; 1410 } 1411 } 1412 1413 if (matches) 1414 return c; 1415 } 1416 } 1417 1418 throw new InternalError("Enclosing constructor not found"); 1419 } 1420 } 1421 1422 1423 /** 1424 * If the class or interface represented by this {@code Class} object 1425 * is a member of another class, returns the {@code Class} object 1426 * representing the class in which it was declared. This method returns 1427 * null if this class or interface is not a member of any other class. If 1428 * this {@code Class} object represents an array class, a primitive 1429 * type, or void,then this method returns null. 1430 * 1431 * @return the declaring class for this class 1432 * @throws SecurityException 1433 * If a security manager, <i>s</i>, is present and the caller's 1434 * class loader is not the same as or an ancestor of the class 1435 * loader for the declaring class and invocation of {@link 1436 * SecurityManager#checkPackageAccess s.checkPackageAccess()} 1437 * denies access to the package of the declaring class 1438 * @since 1.1 1439 */ 1440 @CallerSensitive 1441 public Class<?> getDeclaringClass() throws SecurityException { 1442 final Class<?> candidate = getDeclaringClass0(); 1443 1444 if (candidate != null) 1445 candidate.checkPackageAccess( 1446 ClassLoader.getClassLoader(Reflection.getCallerClass()), true); 1447 return candidate; 1448 } 1449 1450 private native Class<?> getDeclaringClass0(); 1451 1452 1453 /** 1454 * Returns the immediately enclosing class of the underlying 1455 * class. If the underlying class is a top level class this 1456 * method returns {@code null}. 1457 * @return the immediately enclosing class of the underlying class 1458 * @exception SecurityException 1459 * If a security manager, <i>s</i>, is present and the caller's 1460 * class loader is not the same as or an ancestor of the class 1461 * loader for the enclosing class and invocation of {@link 1462 * SecurityManager#checkPackageAccess s.checkPackageAccess()} 1463 * denies access to the package of the enclosing class 1464 * @since 1.5 1465 */ 1466 @CallerSensitive 1467 public Class<?> getEnclosingClass() throws SecurityException { 1468 // There are five kinds of classes (or interfaces): 1469 // a) Top level classes 1470 // b) Nested classes (static member classes) 1471 // c) Inner classes (non-static member classes) 1472 // d) Local classes (named classes declared within a method) 1473 // e) Anonymous classes 1474 1475 1476 // JVM Spec 4.7.7: A class must have an EnclosingMethod 1477 // attribute if and only if it is a local class or an 1478 // anonymous class. 1479 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1480 Class<?> enclosingCandidate; 1481 1482 if (enclosingInfo == null) { 1483 // This is a top level or a nested class or an inner class (a, b, or c) 1484 enclosingCandidate = getDeclaringClass(); 1485 } else { 1486 Class<?> enclosingClass = enclosingInfo.getEnclosingClass(); 1487 // This is a local class or an anonymous class (d or e) 1488 if (enclosingClass == this || enclosingClass == null) 1489 throw new InternalError("Malformed enclosing method information"); 1490 else 1491 enclosingCandidate = enclosingClass; 1492 } 1493 1494 if (enclosingCandidate != null) 1495 enclosingCandidate.checkPackageAccess( 1496 ClassLoader.getClassLoader(Reflection.getCallerClass()), true); 1497 return enclosingCandidate; 1498 } 1499 1500 /** 1501 * Returns the simple name of the underlying class as given in the 1502 * source code. Returns an empty string if the underlying class is 1503 * anonymous. 1504 * 1505 * <p>The simple name of an array is the simple name of the 1506 * component type with "[]" appended. In particular the simple 1507 * name of an array whose component type is anonymous is "[]". 1508 * 1509 * @return the simple name of the underlying class 1510 * @since 1.5 1511 */ 1512 public String getSimpleName() { 1513 if (isArray()) 1514 return getComponentType().getSimpleName()+"[]"; 1515 1516 String simpleName = getSimpleBinaryName(); 1517 if (simpleName == null) { // top level class 1518 simpleName = getName(); 1519 return simpleName.substring(simpleName.lastIndexOf('.')+1); // strip the package name 1520 } 1521 return simpleName; 1522 } 1523 1524 /** 1525 * Return an informative string for the name of this type. 1526 * 1527 * @return an informative string for the name of this type 1528 * @since 1.8 1529 */ 1530 public String getTypeName() { 1531 if (isArray()) { 1532 try { 1533 Class<?> cl = this; 1534 int dimensions = 0; 1535 while (cl.isArray()) { 1536 dimensions++; 1537 cl = cl.getComponentType(); 1538 } 1539 StringBuilder sb = new StringBuilder(); 1540 sb.append(cl.getName()); 1541 for (int i = 0; i < dimensions; i++) { 1542 sb.append("[]"); 1543 } 1544 return sb.toString(); 1545 } catch (Throwable e) { /*FALLTHRU*/ } 1546 } 1547 return getName(); 1548 } 1549 1550 /** 1551 * Character.isDigit answers {@code true} to some non-ascii 1552 * digits. This one does not. 1553 */ 1554 private static boolean isAsciiDigit(char c) { 1555 return '0' <= c && c <= '9'; 1556 } 1557 1558 /** 1559 * Returns the canonical name of the underlying class as 1560 * defined by the Java Language Specification. Returns null if 1561 * the underlying class does not have a canonical name (i.e., if 1562 * it is a local or anonymous class or an array whose component 1563 * type does not have a canonical name). 1564 * @return the canonical name of the underlying class if it exists, and 1565 * {@code null} otherwise. 1566 * @since 1.5 1567 */ 1568 public String getCanonicalName() { 1569 if (isArray()) { 1570 String canonicalName = getComponentType().getCanonicalName(); 1571 if (canonicalName != null) 1572 return canonicalName + "[]"; 1573 else 1574 return null; 1575 } 1576 if (isLocalOrAnonymousClass()) 1577 return null; 1578 Class<?> enclosingClass = getEnclosingClass(); 1579 if (enclosingClass == null) { // top level class 1580 return getName(); 1581 } else { 1582 String enclosingName = enclosingClass.getCanonicalName(); 1583 if (enclosingName == null) 1584 return null; 1585 return enclosingName + "." + getSimpleName(); 1586 } 1587 } 1588 1589 /** 1590 * Returns {@code true} if and only if the underlying class 1591 * is an anonymous class. 1592 * 1593 * @return {@code true} if and only if this class is an anonymous class. 1594 * @since 1.5 1595 */ 1596 public boolean isAnonymousClass() { 1597 return "".equals(getSimpleName()); 1598 } 1599 1600 /** 1601 * Returns {@code true} if and only if the underlying class 1602 * is a local class. 1603 * 1604 * @return {@code true} if and only if this class is a local class. 1605 * @since 1.5 1606 */ 1607 public boolean isLocalClass() { 1608 return isLocalOrAnonymousClass() && !isAnonymousClass(); 1609 } 1610 1611 /** 1612 * Returns {@code true} if and only if the underlying class 1613 * is a member class. 1614 * 1615 * @return {@code true} if and only if this class is a member class. 1616 * @since 1.5 1617 */ 1618 public boolean isMemberClass() { 1619 return getSimpleBinaryName() != null && !isLocalOrAnonymousClass(); 1620 } 1621 1622 /** 1623 * Returns the "simple binary name" of the underlying class, i.e., 1624 * the binary name without the leading enclosing class name. 1625 * Returns {@code null} if the underlying class is a top level 1626 * class. 1627 */ 1628 private String getSimpleBinaryName() { 1629 Class<?> enclosingClass = getEnclosingClass(); 1630 if (enclosingClass == null) // top level class 1631 return null; 1632 String name = getSimpleBinaryName0(); 1633 if (name == null) // anonymous class 1634 return ""; 1635 return name; 1636 } 1637 1638 private native String getSimpleBinaryName0(); 1639 1640 /** 1641 * Returns {@code true} if this is a local class or an anonymous 1642 * class. Returns {@code false} otherwise. 1643 */ 1644 private boolean isLocalOrAnonymousClass() { 1645 // JVM Spec 4.7.7: A class must have an EnclosingMethod 1646 // attribute if and only if it is a local class or an 1647 // anonymous class. 1648 return getEnclosingMethodInfo() != null; 1649 } 1650 1651 /** 1652 * Returns an array containing {@code Class} objects representing all 1653 * the public classes and interfaces that are members of the class 1654 * represented by this {@code Class} object. This includes public 1655 * class and interface members inherited from superclasses and public class 1656 * and interface members declared by the class. This method returns an 1657 * array of length 0 if this {@code Class} object has no public member 1658 * classes or interfaces. This method also returns an array of length 0 if 1659 * this {@code Class} object represents a primitive type, an array 1660 * class, or void. 1661 * 1662 * @return the array of {@code Class} objects representing the public 1663 * members of this class 1664 * @throws SecurityException 1665 * If a security manager, <i>s</i>, is present and 1666 * the caller's class loader is not the same as or an 1667 * ancestor of the class loader for the current class and 1668 * invocation of {@link SecurityManager#checkPackageAccess 1669 * s.checkPackageAccess()} denies access to the package 1670 * of this class. 1671 * 1672 * @since 1.1 1673 */ 1674 @CallerSensitive 1675 public Class<?>[] getClasses() { 1676 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false); 1677 1678 // Privileged so this implementation can look at DECLARED classes, 1679 // something the caller might not have privilege to do. The code here 1680 // is allowed to look at DECLARED classes because (1) it does not hand 1681 // out anything other than public members and (2) public member access 1682 // has already been ok'd by the SecurityManager. 1683 1684 return java.security.AccessController.doPrivileged( 1685 new java.security.PrivilegedAction<>() { 1686 public Class<?>[] run() { 1687 List<Class<?>> list = new ArrayList<>(); 1688 Class<?> currentClass = Class.this; 1689 while (currentClass != null) { 1690 for (Class<?> m : currentClass.getDeclaredClasses()) { 1691 if (Modifier.isPublic(m.getModifiers())) { 1692 list.add(m); 1693 } 1694 } 1695 currentClass = currentClass.getSuperclass(); 1696 } 1697 return list.toArray(new Class<?>[0]); 1698 } 1699 }); 1700 } 1701 1702 1703 /** 1704 * Returns an array containing {@code Field} objects reflecting all 1705 * the accessible public fields of the class or interface represented by 1706 * this {@code Class} object. 1707 * 1708 * <p> If this {@code Class} object represents a class or interface with 1709 * no accessible public fields, then this method returns an array of length 1710 * 0. 1711 * 1712 * <p> If this {@code Class} object represents a class, then this method 1713 * returns the public fields of the class and of all its superclasses and 1714 * superinterfaces. 1715 * 1716 * <p> If this {@code Class} object represents an interface, then this 1717 * method returns the fields of the interface and of all its 1718 * superinterfaces. 1719 * 1720 * <p> If this {@code Class} object represents an array type, a primitive 1721 * type, or void, then this method returns an array of length 0. 1722 * 1723 * <p> The elements in the returned array are not sorted and are not in any 1724 * particular order. 1725 * 1726 * @return the array of {@code Field} objects representing the 1727 * public fields 1728 * @throws SecurityException 1729 * If a security manager, <i>s</i>, is present and 1730 * the caller's class loader is not the same as or an 1731 * ancestor of the class loader for the current class and 1732 * invocation of {@link SecurityManager#checkPackageAccess 1733 * s.checkPackageAccess()} denies access to the package 1734 * of this class. 1735 * 1736 * @since 1.1 1737 * @jls 8.2 Class Members 1738 * @jls 8.3 Field Declarations 1739 */ 1740 @CallerSensitive 1741 public Field[] getFields() throws SecurityException { 1742 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); 1743 return copyFields(privateGetPublicFields(null)); 1744 } 1745 1746 1747 /** 1748 * Returns an array containing {@code Method} objects reflecting all the 1749 * public methods of the class or interface represented by this {@code 1750 * Class} object, including those declared by the class or interface and 1751 * those inherited from superclasses and superinterfaces. 1752 * 1753 * <p> If this {@code Class} object represents a type that has multiple 1754 * public methods with the same name and parameter types, but different 1755 * return types, then the returned array has a {@code Method} object for 1756 * each such method. 1757 * 1758 * <p> If this {@code Class} object represents a type with a class 1759 * initialization method {@code <clinit>}, then the returned array does 1760 * <em>not</em> have a corresponding {@code Method} object. 1761 * 1762 * <p> If this {@code Class} object represents an array type, then the 1763 * returned array has a {@code Method} object for each of the public 1764 * methods inherited by the array type from {@code Object}. It does not 1765 * contain a {@code Method} object for {@code clone()}. 1766 * 1767 * <p> If this {@code Class} object represents an interface then the 1768 * returned array does not contain any implicitly declared methods from 1769 * {@code Object}. Therefore, if no methods are explicitly declared in 1770 * this interface or any of its superinterfaces then the returned array 1771 * has length 0. (Note that a {@code Class} object which represents a class 1772 * always has public methods, inherited from {@code Object}.) 1773 * 1774 * <p> If this {@code Class} object represents a primitive type or void, 1775 * then the returned array has length 0. 1776 * 1777 * <p> Static methods declared in superinterfaces of the class or interface 1778 * represented by this {@code Class} object are not considered members of 1779 * the class or interface. 1780 * 1781 * <p> The elements in the returned array are not sorted and are not in any 1782 * particular order. 1783 * 1784 * @return the array of {@code Method} objects representing the 1785 * public methods of this class 1786 * @throws SecurityException 1787 * If a security manager, <i>s</i>, is present and 1788 * the caller's class loader is not the same as or an 1789 * ancestor of the class loader for the current class and 1790 * invocation of {@link SecurityManager#checkPackageAccess 1791 * s.checkPackageAccess()} denies access to the package 1792 * of this class. 1793 * 1794 * @jls 8.2 Class Members 1795 * @jls 8.4 Method Declarations 1796 * @since 1.1 1797 */ 1798 @CallerSensitive 1799 public Method[] getMethods() throws SecurityException { 1800 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); 1801 return copyMethods(privateGetPublicMethods()); 1802 } 1803 1804 1805 /** 1806 * Returns an array containing {@code Constructor} objects reflecting 1807 * all the public constructors of the class represented by this 1808 * {@code Class} object. An array of length 0 is returned if the 1809 * class has no public constructors, or if the class is an array class, or 1810 * if the class reflects a primitive type or void. 1811 * 1812 * Note that while this method returns an array of {@code 1813 * Constructor<T>} objects (that is an array of constructors from 1814 * this class), the return type of this method is {@code 1815 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as 1816 * might be expected. This less informative return type is 1817 * necessary since after being returned from this method, the 1818 * array could be modified to hold {@code Constructor} objects for 1819 * different classes, which would violate the type guarantees of 1820 * {@code Constructor<T>[]}. 1821 * 1822 * @return the array of {@code Constructor} objects representing the 1823 * public constructors of this class 1824 * @throws SecurityException 1825 * If a security manager, <i>s</i>, is present and 1826 * the caller's class loader is not the same as or an 1827 * ancestor of the class loader for the current class and 1828 * invocation of {@link SecurityManager#checkPackageAccess 1829 * s.checkPackageAccess()} denies access to the package 1830 * of this class. 1831 * 1832 * @since 1.1 1833 */ 1834 @CallerSensitive 1835 public Constructor<?>[] getConstructors() throws SecurityException { 1836 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); 1837 return copyConstructors(privateGetDeclaredConstructors(true)); 1838 } 1839 1840 1841 /** 1842 * Returns a {@code Field} object that reflects the specified public member 1843 * field of the class or interface represented by this {@code Class} 1844 * object. The {@code name} parameter is a {@code String} specifying the 1845 * simple name of the desired field. 1846 * 1847 * <p> The field to be reflected is determined by the algorithm that 1848 * follows. Let C be the class or interface represented by this object: 1849 * 1850 * <OL> 1851 * <LI> If C declares a public field with the name specified, that is the 1852 * field to be reflected.</LI> 1853 * <LI> If no field was found in step 1 above, this algorithm is applied 1854 * recursively to each direct superinterface of C. The direct 1855 * superinterfaces are searched in the order they were declared.</LI> 1856 * <LI> If no field was found in steps 1 and 2 above, and C has a 1857 * superclass S, then this algorithm is invoked recursively upon S. 1858 * If C has no superclass, then a {@code NoSuchFieldException} 1859 * is thrown.</LI> 1860 * </OL> 1861 * 1862 * <p> If this {@code Class} object represents an array type, then this 1863 * method does not find the {@code length} field of the array type. 1864 * 1865 * @param name the field name 1866 * @return the {@code Field} object of this class specified by 1867 * {@code name} 1868 * @throws NoSuchFieldException if a field with the specified name is 1869 * not found. 1870 * @throws NullPointerException if {@code name} is {@code null} 1871 * @throws SecurityException 1872 * If a security manager, <i>s</i>, is present and 1873 * the caller's class loader is not the same as or an 1874 * ancestor of the class loader for the current class and 1875 * invocation of {@link SecurityManager#checkPackageAccess 1876 * s.checkPackageAccess()} denies access to the package 1877 * of this class. 1878 * 1879 * @since 1.1 1880 * @jls 8.2 Class Members 1881 * @jls 8.3 Field Declarations 1882 */ 1883 @CallerSensitive 1884 public Field getField(String name) 1885 throws NoSuchFieldException, SecurityException { 1886 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); 1887 Field field = getField0(name); 1888 if (field == null) { 1889 throw new NoSuchFieldException(name); 1890 } 1891 return field; 1892 } 1893 1894 1895 /** 1896 * Returns a {@code Method} object that reflects the specified public 1897 * member method of the class or interface represented by this 1898 * {@code Class} object. The {@code name} parameter is a 1899 * {@code String} specifying the simple name of the desired method. The 1900 * {@code parameterTypes} parameter is an array of {@code Class} 1901 * objects that identify the method's formal parameter types, in declared 1902 * order. If {@code parameterTypes} is {@code null}, it is 1903 * treated as if it were an empty array. 1904 * 1905 * <p> If the {@code name} is "{@code <init>}" or "{@code <clinit>}" a 1906 * {@code NoSuchMethodException} is raised. Otherwise, the method to 1907 * be reflected is determined by the algorithm that follows. Let C be the 1908 * class or interface represented by this object: 1909 * <OL> 1910 * <LI> C is searched for a <I>matching method</I>, as defined below. If a 1911 * matching method is found, it is reflected.</LI> 1912 * <LI> If no matching method is found by step 1 then: 1913 * <OL TYPE="a"> 1914 * <LI> If C is a class other than {@code Object}, then this algorithm is 1915 * invoked recursively on the superclass of C.</LI> 1916 * <LI> If C is the class {@code Object}, or if C is an interface, then 1917 * the superinterfaces of C (if any) are searched for a matching 1918 * method. If any such method is found, it is reflected.</LI> 1919 * </OL></LI> 1920 * </OL> 1921 * 1922 * <p> To find a matching method in a class or interface C: If C 1923 * declares exactly one public method with the specified name and exactly 1924 * the same formal parameter types, that is the method reflected. If more 1925 * than one such method is found in C, and one of these methods has a 1926 * return type that is more specific than any of the others, that method is 1927 * reflected; otherwise one of the methods is chosen arbitrarily. 1928 * 1929 * <p>Note that there may be more than one matching method in a 1930 * class because while the Java language forbids a class to 1931 * declare multiple methods with the same signature but different 1932 * return types, the Java virtual machine does not. This 1933 * increased flexibility in the virtual machine can be used to 1934 * implement various language features. For example, covariant 1935 * returns can be implemented with {@linkplain 1936 * java.lang.reflect.Method#isBridge bridge methods}; the bridge 1937 * method and the method being overridden would have the same 1938 * signature but different return types. 1939 * 1940 * <p> If this {@code Class} object represents an array type, then this 1941 * method does not find the {@code clone()} method. 1942 * 1943 * <p> Static methods declared in superinterfaces of the class or interface 1944 * represented by this {@code Class} object are not considered members of 1945 * the class or interface. 1946 * 1947 * @param name the name of the method 1948 * @param parameterTypes the list of parameters 1949 * @return the {@code Method} object that matches the specified 1950 * {@code name} and {@code parameterTypes} 1951 * @throws NoSuchMethodException if a matching method is not found 1952 * or if the name is "<init>"or "<clinit>". 1953 * @throws NullPointerException if {@code name} is {@code null} 1954 * @throws SecurityException 1955 * If a security manager, <i>s</i>, is present and 1956 * the caller's class loader is not the same as or an 1957 * ancestor of the class loader for the current class and 1958 * invocation of {@link SecurityManager#checkPackageAccess 1959 * s.checkPackageAccess()} denies access to the package 1960 * of this class. 1961 * 1962 * @jls 8.2 Class Members 1963 * @jls 8.4 Method Declarations 1964 * @since 1.1 1965 */ 1966 @CallerSensitive 1967 public Method getMethod(String name, Class<?>... parameterTypes) 1968 throws NoSuchMethodException, SecurityException { 1969 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); 1970 Method method = getMethod0(name, parameterTypes, true); 1971 if (method == null) { 1972 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); 1973 } 1974 return method; 1975 } 1976 1977 /** 1978 * Returns a {@code Method} object that reflects the specified public 1979 * member method of the class or interface represented by this 1980 * {@code Class} object. 1981 * 1982 * @param name the name of the method 1983 * @param parameterTypes the list of parameters 1984 * @return the {@code Method} object that matches the specified 1985 * {@code name} and {@code parameterTypes}; {@code null} 1986 * if the method is not found or the name is 1987 * "<init>"or "<clinit>". 1988 */ 1989 Method getMethodOrNull(String name, Class<?>... parameterTypes) { 1990 return getMethod0(name, parameterTypes, true); 1991 } 1992 1993 1994 /** 1995 * Returns a {@code Constructor} object that reflects the specified 1996 * public constructor of the class represented by this {@code Class} 1997 * object. The {@code parameterTypes} parameter is an array of 1998 * {@code Class} objects that identify the constructor's formal 1999 * parameter types, in declared order. 2000 * 2001 * If this {@code Class} object represents an inner class 2002 * declared in a non-static context, the formal parameter types 2003 * include the explicit enclosing instance as the first parameter. 2004 * 2005 * <p> The constructor to reflect is the public constructor of the class 2006 * represented by this {@code Class} object whose formal parameter 2007 * types match those specified by {@code parameterTypes}. 2008 * 2009 * @param parameterTypes the parameter array 2010 * @return the {@code Constructor} object of the public constructor that 2011 * matches the specified {@code parameterTypes} 2012 * @throws NoSuchMethodException if a matching method is not found. 2013 * @throws SecurityException 2014 * If a security manager, <i>s</i>, is present and 2015 * the caller's class loader is not the same as or an 2016 * ancestor of the class loader for the current class and 2017 * invocation of {@link SecurityManager#checkPackageAccess 2018 * s.checkPackageAccess()} denies access to the package 2019 * of this class. 2020 * 2021 * @since 1.1 2022 */ 2023 @CallerSensitive 2024 public Constructor<T> getConstructor(Class<?>... parameterTypes) 2025 throws NoSuchMethodException, SecurityException { 2026 checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); 2027 return getConstructor0(parameterTypes, Member.PUBLIC); 2028 } 2029 2030 2031 /** 2032 * Returns an array of {@code Class} objects reflecting all the 2033 * classes and interfaces declared as members of the class represented by 2034 * this {@code Class} object. This includes public, protected, default 2035 * (package) access, and private classes and interfaces declared by the 2036 * class, but excludes inherited classes and interfaces. This method 2037 * returns an array of length 0 if the class declares no classes or 2038 * interfaces as members, or if this {@code Class} object represents a 2039 * primitive type, an array class, or void. 2040 * 2041 * @return the array of {@code Class} objects representing all the 2042 * declared members of this class 2043 * @throws SecurityException 2044 * If a security manager, <i>s</i>, is present and any of the 2045 * following conditions is met: 2046 * 2047 * <ul> 2048 * 2049 * <li> the caller's class loader is not the same as the 2050 * class loader of this class and invocation of 2051 * {@link SecurityManager#checkPermission 2052 * s.checkPermission} method with 2053 * {@code RuntimePermission("accessDeclaredMembers")} 2054 * denies access to the declared classes within this class 2055 * 2056 * <li> the caller's class loader is not the same as or an 2057 * ancestor of the class loader for the current class and 2058 * invocation of {@link SecurityManager#checkPackageAccess 2059 * s.checkPackageAccess()} denies access to the package 2060 * of this class 2061 * 2062 * </ul> 2063 * 2064 * @since 1.1 2065 */ 2066 @CallerSensitive 2067 public Class<?>[] getDeclaredClasses() throws SecurityException { 2068 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), false); 2069 return getDeclaredClasses0(); 2070 } 2071 2072 2073 /** 2074 * Returns an array of {@code Field} objects reflecting all the fields 2075 * declared by the class or interface represented by this 2076 * {@code Class} object. This includes public, protected, default 2077 * (package) access, and private fields, but excludes inherited fields. 2078 * 2079 * <p> If this {@code Class} object represents a class or interface with no 2080 * declared fields, then this method returns an array of length 0. 2081 * 2082 * <p> If this {@code Class} object represents an array type, a primitive 2083 * type, or void, then this method returns an array of length 0. 2084 * 2085 * <p> The elements in the returned array are not sorted and are not in any 2086 * particular order. 2087 * 2088 * @return the array of {@code Field} objects representing all the 2089 * declared fields of this class 2090 * @throws SecurityException 2091 * If a security manager, <i>s</i>, is present and any of the 2092 * following conditions is met: 2093 * 2094 * <ul> 2095 * 2096 * <li> the caller's class loader is not the same as the 2097 * class loader of this class and invocation of 2098 * {@link SecurityManager#checkPermission 2099 * s.checkPermission} method with 2100 * {@code RuntimePermission("accessDeclaredMembers")} 2101 * denies access to the declared fields within this class 2102 * 2103 * <li> the caller's class loader is not the same as or an 2104 * ancestor of the class loader for the current class and 2105 * invocation of {@link SecurityManager#checkPackageAccess 2106 * s.checkPackageAccess()} denies access to the package 2107 * of this class 2108 * 2109 * </ul> 2110 * 2111 * @since 1.1 2112 * @jls 8.2 Class Members 2113 * @jls 8.3 Field Declarations 2114 */ 2115 @CallerSensitive 2116 public Field[] getDeclaredFields() throws SecurityException { 2117 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); 2118 return copyFields(privateGetDeclaredFields(false)); 2119 } 2120 2121 2122 /** 2123 * 2124 * Returns an array containing {@code Method} objects reflecting all the 2125 * declared methods of the class or interface represented by this {@code 2126 * Class} object, including public, protected, default (package) 2127 * access, and private methods, but excluding inherited methods. 2128 * 2129 * <p> If this {@code Class} object represents a type that has multiple 2130 * declared methods with the same name and parameter types, but different 2131 * return types, then the returned array has a {@code Method} object for 2132 * each such method. 2133 * 2134 * <p> If this {@code Class} object represents a type that has a class 2135 * initialization method {@code <clinit>}, then the returned array does 2136 * <em>not</em> have a corresponding {@code Method} object. 2137 * 2138 * <p> If this {@code Class} object represents a class or interface with no 2139 * declared methods, then the returned array has length 0. 2140 * 2141 * <p> If this {@code Class} object represents an array type, a primitive 2142 * type, or void, then the returned array has length 0. 2143 * 2144 * <p> The elements in the returned array are not sorted and are not in any 2145 * particular order. 2146 * 2147 * @return the array of {@code Method} objects representing all the 2148 * declared methods of this class 2149 * @throws SecurityException 2150 * If a security manager, <i>s</i>, is present and any of the 2151 * following conditions is met: 2152 * 2153 * <ul> 2154 * 2155 * <li> the caller's class loader is not the same as the 2156 * class loader of this class and invocation of 2157 * {@link SecurityManager#checkPermission 2158 * s.checkPermission} method with 2159 * {@code RuntimePermission("accessDeclaredMembers")} 2160 * denies access to the declared methods within this class 2161 * 2162 * <li> the caller's class loader is not the same as or an 2163 * ancestor of the class loader for the current class and 2164 * invocation of {@link SecurityManager#checkPackageAccess 2165 * s.checkPackageAccess()} denies access to the package 2166 * of this class 2167 * 2168 * </ul> 2169 * 2170 * @jls 8.2 Class Members 2171 * @jls 8.4 Method Declarations 2172 * @since 1.1 2173 */ 2174 @CallerSensitive 2175 public Method[] getDeclaredMethods() throws SecurityException { 2176 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); 2177 return copyMethods(privateGetDeclaredMethods(false)); 2178 } 2179 2180 2181 /** 2182 * Returns an array of {@code Constructor} objects reflecting all the 2183 * constructors declared by the class represented by this 2184 * {@code Class} object. These are public, protected, default 2185 * (package) access, and private constructors. The elements in the array 2186 * returned are not sorted and are not in any particular order. If the 2187 * class has a default constructor, it is included in the returned array. 2188 * This method returns an array of length 0 if this {@code Class} 2189 * object represents an interface, a primitive type, an array class, or 2190 * void. 2191 * 2192 * <p> See <em>The Java Language Specification</em>, section 8.2. 2193 * 2194 * @return the array of {@code Constructor} objects representing all the 2195 * declared constructors of this class 2196 * @throws SecurityException 2197 * If a security manager, <i>s</i>, is present and any of the 2198 * following conditions is met: 2199 * 2200 * <ul> 2201 * 2202 * <li> the caller's class loader is not the same as the 2203 * class loader of this class and invocation of 2204 * {@link SecurityManager#checkPermission 2205 * s.checkPermission} method with 2206 * {@code RuntimePermission("accessDeclaredMembers")} 2207 * denies access to the declared constructors within this class 2208 * 2209 * <li> the caller's class loader is not the same as or an 2210 * ancestor of the class loader for the current class and 2211 * invocation of {@link SecurityManager#checkPackageAccess 2212 * s.checkPackageAccess()} denies access to the package 2213 * of this class 2214 * 2215 * </ul> 2216 * 2217 * @since 1.1 2218 */ 2219 @CallerSensitive 2220 public Constructor<?>[] getDeclaredConstructors() throws SecurityException { 2221 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); 2222 return copyConstructors(privateGetDeclaredConstructors(false)); 2223 } 2224 2225 2226 /** 2227 * Returns a {@code Field} object that reflects the specified declared 2228 * field of the class or interface represented by this {@code Class} 2229 * object. The {@code name} parameter is a {@code String} that specifies 2230 * the simple name of the desired field. 2231 * 2232 * <p> If this {@code Class} object represents an array type, then this 2233 * method does not find the {@code length} field of the array type. 2234 * 2235 * @param name the name of the field 2236 * @return the {@code Field} object for the specified field in this 2237 * class 2238 * @throws NoSuchFieldException if a field with the specified name is 2239 * not found. 2240 * @throws NullPointerException if {@code name} is {@code null} 2241 * @throws SecurityException 2242 * If a security manager, <i>s</i>, is present and any of the 2243 * following conditions is met: 2244 * 2245 * <ul> 2246 * 2247 * <li> the caller's class loader is not the same as the 2248 * class loader of this class and invocation of 2249 * {@link SecurityManager#checkPermission 2250 * s.checkPermission} method with 2251 * {@code RuntimePermission("accessDeclaredMembers")} 2252 * denies access to the declared field 2253 * 2254 * <li> the caller's class loader is not the same as or an 2255 * ancestor of the class loader for the current class and 2256 * invocation of {@link SecurityManager#checkPackageAccess 2257 * s.checkPackageAccess()} denies access to the package 2258 * of this class 2259 * 2260 * </ul> 2261 * 2262 * @since 1.1 2263 * @jls 8.2 Class Members 2264 * @jls 8.3 Field Declarations 2265 */ 2266 @CallerSensitive 2267 public Field getDeclaredField(String name) 2268 throws NoSuchFieldException, SecurityException { 2269 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); 2270 Field field = searchFields(privateGetDeclaredFields(false), name); 2271 if (field == null) { 2272 throw new NoSuchFieldException(name); 2273 } 2274 return field; 2275 } 2276 2277 2278 /** 2279 * Returns a {@code Method} object that reflects the specified 2280 * declared method of the class or interface represented by this 2281 * {@code Class} object. The {@code name} parameter is a 2282 * {@code String} that specifies the simple name of the desired 2283 * method, and the {@code parameterTypes} parameter is an array of 2284 * {@code Class} objects that identify the method's formal parameter 2285 * types, in declared order. If more than one method with the same 2286 * parameter types is declared in a class, and one of these methods has a 2287 * return type that is more specific than any of the others, that method is 2288 * returned; otherwise one of the methods is chosen arbitrarily. If the 2289 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException} 2290 * is raised. 2291 * 2292 * <p> If this {@code Class} object represents an array type, then this 2293 * method does not find the {@code clone()} method. 2294 * 2295 * @param name the name of the method 2296 * @param parameterTypes the parameter array 2297 * @return the {@code Method} object for the method of this class 2298 * matching the specified name and parameters 2299 * @throws NoSuchMethodException if a matching method is not found. 2300 * @throws NullPointerException if {@code name} is {@code null} 2301 * @throws SecurityException 2302 * If a security manager, <i>s</i>, is present and any of the 2303 * following conditions is met: 2304 * 2305 * <ul> 2306 * 2307 * <li> the caller's class loader is not the same as the 2308 * class loader of this class and invocation of 2309 * {@link SecurityManager#checkPermission 2310 * s.checkPermission} method with 2311 * {@code RuntimePermission("accessDeclaredMembers")} 2312 * denies access to the declared method 2313 * 2314 * <li> the caller's class loader is not the same as or an 2315 * ancestor of the class loader for the current class and 2316 * invocation of {@link SecurityManager#checkPackageAccess 2317 * s.checkPackageAccess()} denies access to the package 2318 * of this class 2319 * 2320 * </ul> 2321 * 2322 * @jls 8.2 Class Members 2323 * @jls 8.4 Method Declarations 2324 * @since 1.1 2325 */ 2326 @CallerSensitive 2327 public Method getDeclaredMethod(String name, Class<?>... parameterTypes) 2328 throws NoSuchMethodException, SecurityException { 2329 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); 2330 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); 2331 if (method == null) { 2332 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); 2333 } 2334 return method; 2335 } 2336 2337 2338 /** 2339 * Returns a {@code Constructor} object that reflects the specified 2340 * constructor of the class or interface represented by this 2341 * {@code Class} object. The {@code parameterTypes} parameter is 2342 * an array of {@code Class} objects that identify the constructor's 2343 * formal parameter types, in declared order. 2344 * 2345 * If this {@code Class} object represents an inner class 2346 * declared in a non-static context, the formal parameter types 2347 * include the explicit enclosing instance as the first parameter. 2348 * 2349 * @param parameterTypes the parameter array 2350 * @return The {@code Constructor} object for the constructor with the 2351 * specified parameter list 2352 * @throws NoSuchMethodException if a matching method is not found. 2353 * @throws SecurityException 2354 * If a security manager, <i>s</i>, is present and any of the 2355 * following conditions is met: 2356 * 2357 * <ul> 2358 * 2359 * <li> the caller's class loader is not the same as the 2360 * class loader of this class and invocation of 2361 * {@link SecurityManager#checkPermission 2362 * s.checkPermission} method with 2363 * {@code RuntimePermission("accessDeclaredMembers")} 2364 * denies access to the declared constructor 2365 * 2366 * <li> the caller's class loader is not the same as or an 2367 * ancestor of the class loader for the current class and 2368 * invocation of {@link SecurityManager#checkPackageAccess 2369 * s.checkPackageAccess()} denies access to the package 2370 * of this class 2371 * 2372 * </ul> 2373 * 2374 * @since 1.1 2375 */ 2376 @CallerSensitive 2377 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) 2378 throws NoSuchMethodException, SecurityException { 2379 checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true); 2380 return getConstructor0(parameterTypes, Member.DECLARED); 2381 } 2382 2383 /** 2384 * Finds a resource with a given name. 2385 * 2386 * <p> If this class is in a named {@link Module Module} then this method 2387 * will attempt to find the resource in the module by means of the absolute 2388 * resource name, subject to the rules for encapsulation specified in the 2389 * {@code Module} {@link Module#getResourceAsStream getResourceAsStream} 2390 * method. 2391 * 2392 * <p> Otherwise, if this class is not in a named module then the rules for 2393 * searching resources associated with a given class are implemented by the 2394 * defining {@linkplain ClassLoader class loader} of the class. This method 2395 * delegates to this object's class loader. If this object was loaded by 2396 * the bootstrap class loader, the method delegates to {@link 2397 * ClassLoader#getSystemResourceAsStream}. 2398 * 2399 * <p> Before finding a resource in the caller's module or delegation to a 2400 * class loader, an absolute resource name is constructed from the given 2401 * resource name using this algorithm: 2402 * 2403 * <ul> 2404 * 2405 * <li> If the {@code name} begins with a {@code '/'} 2406 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the 2407 * portion of the {@code name} following the {@code '/'}. 2408 * 2409 * <li> Otherwise, the absolute name is of the following form: 2410 * 2411 * <blockquote> 2412 * {@code modified_package_name/name} 2413 * </blockquote> 2414 * 2415 * <p> Where the {@code modified_package_name} is the package name of this 2416 * object with {@code '/'} substituted for {@code '.'} 2417 * (<tt>'\u002e'</tt>). 2418 * 2419 * </ul> 2420 * 2421 * @param name name of the desired resource 2422 * @return A {@link java.io.InputStream} object; {@code null} if no 2423 * resource with this name is found, the resource is in a package 2424 * that is not {@link Module#isOpen(String, Module) open} to at 2425 * least the caller module, or access to the resource is denied 2426 * by the security manager. 2427 * @throws NullPointerException If {@code name} is {@code null} 2428 * @since 1.1 2429 */ 2430 @CallerSensitive 2431 public InputStream getResourceAsStream(String name) { 2432 name = resolveName(name); 2433 2434 Module module = getModule(); 2435 if (module.isNamed()) { 2436 if (!ResourceHelper.isSimpleResource(name)) { 2437 Module caller = Reflection.getCallerClass().getModule(); 2438 if (caller != module) { 2439 Set<String> packages = module.getDescriptor().packages(); 2440 String pn = ResourceHelper.getPackageName(name); 2441 if (packages.contains(pn) && !module.isOpen(pn, caller)) { 2442 // resource is in package not open to caller 2443 return null; 2444 } 2445 } 2446 } 2447 2448 String mn = module.getName(); 2449 ClassLoader cl = getClassLoader0(); 2450 try { 2451 2452 // special-case built-in class loaders to avoid the 2453 // need for a URL connection 2454 if (cl == null) { 2455 return BootLoader.findResourceAsStream(mn, name); 2456 } else if (cl instanceof BuiltinClassLoader) { 2457 return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name); 2458 } else { 2459 URL url = cl.findResource(mn, name); 2460 return (url != null) ? url.openStream() : null; 2461 } 2462 2463 } catch (IOException | SecurityException e) { 2464 return null; 2465 } 2466 } 2467 2468 // unnamed module 2469 ClassLoader cl = getClassLoader0(); 2470 if (cl == null) { 2471 return ClassLoader.getSystemResourceAsStream(name); 2472 } else { 2473 return cl.getResourceAsStream(name); 2474 } 2475 } 2476 2477 /** 2478 * Finds a resource with a given name. 2479 * 2480 * <p> If this class is in a named {@link Module Module} then this method 2481 * will attempt to find the resource in the module by means of the absolute 2482 * resource name, subject to the rules for encapsulation specified in the 2483 * {@code Module} {@link Module#getResourceAsStream getResourceAsStream} 2484 * method. 2485 * 2486 * <p> Otherwise, if this class is not in a named module then the rules for 2487 * searching resources associated with a given class are implemented by the 2488 * defining {@linkplain ClassLoader class loader} of the class. This method 2489 * delegates to this object's class loader. If this object was loaded by 2490 * the bootstrap class loader, the method delegates to {@link 2491 * ClassLoader#getSystemResource}. 2492 * 2493 * <p> Before delegation, an absolute resource name is constructed from the 2494 * given resource name using this algorithm: 2495 * 2496 * <ul> 2497 * 2498 * <li> If the {@code name} begins with a {@code '/'} 2499 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the 2500 * portion of the {@code name} following the {@code '/'}. 2501 * 2502 * <li> Otherwise, the absolute name is of the following form: 2503 * 2504 * <blockquote> 2505 * {@code modified_package_name/name} 2506 * </blockquote> 2507 * 2508 * <p> Where the {@code modified_package_name} is the package name of this 2509 * object with {@code '/'} substituted for {@code '.'} 2510 * (<tt>'\u002e'</tt>). 2511 * 2512 * </ul> 2513 * 2514 * @param name name of the desired resource 2515 * @return A {@link java.net.URL} object; {@code null} if no resource with 2516 * this name is found, the resource cannot be located by a URL, the 2517 * resource is in a package that is not 2518 * {@link Module#isOpen(String, Module) open} to at least the caller 2519 * module, or access to the resource is denied by the security 2520 * manager. 2521 * @throws NullPointerException If {@code name} is {@code null} 2522 * @since 1.1 2523 */ 2524 @CallerSensitive 2525 public URL getResource(String name) { 2526 name = resolveName(name); 2527 2528 Module module = getModule(); 2529 if (module.isNamed()) { 2530 if (!ResourceHelper.isSimpleResource(name)) { 2531 Module caller = Reflection.getCallerClass().getModule(); 2532 if (caller != module) { 2533 Set<String> packages = module.getDescriptor().packages(); 2534 String pn = ResourceHelper.getPackageName(name); 2535 if (packages.contains(pn) && !module.isOpen(pn, caller)) { 2536 // resource is in package not open to caller 2537 return null; 2538 } 2539 } 2540 } 2541 String mn = getModule().getName(); 2542 ClassLoader cl = getClassLoader0(); 2543 try { 2544 if (cl == null) { 2545 return BootLoader.findResource(mn, name); 2546 } else { 2547 return cl.findResource(mn, name); 2548 } 2549 } catch (IOException ioe) { 2550 return null; 2551 } 2552 } 2553 2554 // unnamed module 2555 ClassLoader cl = getClassLoader0(); 2556 if (cl == null) { 2557 return ClassLoader.getSystemResource(name); 2558 } else { 2559 return cl.getResource(name); 2560 } 2561 } 2562 2563 /** protection domain returned when the internal domain is null */ 2564 private static java.security.ProtectionDomain allPermDomain; 2565 2566 2567 /** 2568 * Returns the {@code ProtectionDomain} of this class. If there is a 2569 * security manager installed, this method first calls the security 2570 * manager's {@code checkPermission} method with a 2571 * {@code RuntimePermission("getProtectionDomain")} permission to 2572 * ensure it's ok to get the 2573 * {@code ProtectionDomain}. 2574 * 2575 * @return the ProtectionDomain of this class 2576 * 2577 * @throws SecurityException 2578 * if a security manager exists and its 2579 * {@code checkPermission} method doesn't allow 2580 * getting the ProtectionDomain. 2581 * 2582 * @see java.security.ProtectionDomain 2583 * @see SecurityManager#checkPermission 2584 * @see java.lang.RuntimePermission 2585 * @since 1.2 2586 */ 2587 public java.security.ProtectionDomain getProtectionDomain() { 2588 SecurityManager sm = System.getSecurityManager(); 2589 if (sm != null) { 2590 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION); 2591 } 2592 java.security.ProtectionDomain pd = getProtectionDomain0(); 2593 if (pd == null) { 2594 if (allPermDomain == null) { 2595 java.security.Permissions perms = 2596 new java.security.Permissions(); 2597 perms.add(SecurityConstants.ALL_PERMISSION); 2598 allPermDomain = 2599 new java.security.ProtectionDomain(null, perms); 2600 } 2601 pd = allPermDomain; 2602 } 2603 return pd; 2604 } 2605 2606 2607 /** 2608 * Returns the ProtectionDomain of this class. 2609 */ 2610 private native java.security.ProtectionDomain getProtectionDomain0(); 2611 2612 /* 2613 * Return the Virtual Machine's Class object for the named 2614 * primitive type. 2615 */ 2616 static native Class<?> getPrimitiveClass(String name); 2617 2618 /* 2619 * Check if client is allowed to access members. If access is denied, 2620 * throw a SecurityException. 2621 * 2622 * This method also enforces package access. 2623 * 2624 * <p> Default policy: allow all clients access with normal Java access 2625 * control. 2626 */ 2627 private void checkMemberAccess(int which, Class<?> caller, boolean checkProxyInterfaces) { 2628 final SecurityManager s = System.getSecurityManager(); 2629 if (s != null) { 2630 /* Default policy allows access to all {@link Member#PUBLIC} members, 2631 * as well as access to classes that have the same class loader as the caller. 2632 * In all other cases, it requires RuntimePermission("accessDeclaredMembers") 2633 * permission. 2634 */ 2635 final ClassLoader ccl = ClassLoader.getClassLoader(caller); 2636 final ClassLoader cl = getClassLoader0(); 2637 if (which != Member.PUBLIC) { 2638 if (ccl != cl) { 2639 s.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION); 2640 } 2641 } 2642 this.checkPackageAccess(ccl, checkProxyInterfaces); 2643 } 2644 } 2645 2646 /* 2647 * Checks if a client loaded in ClassLoader ccl is allowed to access this 2648 * class under the current package access policy. If access is denied, 2649 * throw a SecurityException. 2650 */ 2651 private void checkPackageAccess(final ClassLoader ccl, boolean checkProxyInterfaces) { 2652 final SecurityManager s = System.getSecurityManager(); 2653 if (s != null) { 2654 final ClassLoader cl = getClassLoader0(); 2655 2656 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) { 2657 String name = this.getName(); 2658 int i = name.lastIndexOf('.'); 2659 if (i != -1) { 2660 // skip the package access check on a proxy class in default proxy package 2661 String pkg = name.substring(0, i); 2662 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) { 2663 s.checkPackageAccess(pkg); 2664 } 2665 } 2666 } 2667 // check package access on the proxy interfaces 2668 if (checkProxyInterfaces && Proxy.isProxyClass(this)) { 2669 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces()); 2670 } 2671 } 2672 } 2673 2674 /** 2675 * Add a package name prefix if the name is not absolute Remove leading "/" 2676 * if name is absolute 2677 */ 2678 private String resolveName(String name) { 2679 if (!name.startsWith("/")) { 2680 Class<?> c = this; 2681 while (c.isArray()) { 2682 c = c.getComponentType(); 2683 } 2684 String baseName = c.getName(); 2685 int index = baseName.lastIndexOf('.'); 2686 if (index != -1) { 2687 name = baseName.substring(0, index).replace('.', '/') 2688 +"/"+name; 2689 } 2690 } else { 2691 name = name.substring(1); 2692 } 2693 return name; 2694 } 2695 2696 /** 2697 * Atomic operations support. 2698 */ 2699 private static class Atomic { 2700 // initialize Unsafe machinery here, since we need to call Class.class instance method 2701 // and have to avoid calling it in the static initializer of the Class class... 2702 private static final Unsafe unsafe = Unsafe.getUnsafe(); 2703 // offset of Class.reflectionData instance field 2704 private static final long reflectionDataOffset; 2705 // offset of Class.annotationType instance field 2706 private static final long annotationTypeOffset; 2707 // offset of Class.annotationData instance field 2708 private static final long annotationDataOffset; 2709 2710 static { 2711 Field[] fields = Class.class.getDeclaredFields0(false); // bypass caches 2712 reflectionDataOffset = objectFieldOffset(fields, "reflectionData"); 2713 annotationTypeOffset = objectFieldOffset(fields, "annotationType"); 2714 annotationDataOffset = objectFieldOffset(fields, "annotationData"); 2715 } 2716 2717 private static long objectFieldOffset(Field[] fields, String fieldName) { 2718 Field field = searchFields(fields, fieldName); 2719 if (field == null) { 2720 throw new Error("No " + fieldName + " field found in java.lang.Class"); 2721 } 2722 return unsafe.objectFieldOffset(field); 2723 } 2724 2725 static <T> boolean casReflectionData(Class<?> clazz, 2726 SoftReference<ReflectionData<T>> oldData, 2727 SoftReference<ReflectionData<T>> newData) { 2728 return unsafe.compareAndSwapObject(clazz, reflectionDataOffset, oldData, newData); 2729 } 2730 2731 static <T> boolean casAnnotationType(Class<?> clazz, 2732 AnnotationType oldType, 2733 AnnotationType newType) { 2734 return unsafe.compareAndSwapObject(clazz, annotationTypeOffset, oldType, newType); 2735 } 2736 2737 static <T> boolean casAnnotationData(Class<?> clazz, 2738 AnnotationData oldData, 2739 AnnotationData newData) { 2740 return unsafe.compareAndSwapObject(clazz, annotationDataOffset, oldData, newData); 2741 } 2742 } 2743 2744 /** 2745 * Reflection support. 2746 */ 2747 2748 // reflection data that might get invalidated when JVM TI RedefineClasses() is called 2749 private static class ReflectionData<T> { 2750 volatile Field[] declaredFields; 2751 volatile Field[] publicFields; 2752 volatile Method[] declaredMethods; 2753 volatile Method[] publicMethods; 2754 volatile Constructor<T>[] declaredConstructors; 2755 volatile Constructor<T>[] publicConstructors; 2756 // Intermediate results for getFields and getMethods 2757 volatile Field[] declaredPublicFields; 2758 volatile Method[] declaredPublicMethods; 2759 volatile Class<?>[] interfaces; 2760 2761 // Value of classRedefinedCount when we created this ReflectionData instance 2762 final int redefinedCount; 2763 2764 ReflectionData(int redefinedCount) { 2765 this.redefinedCount = redefinedCount; 2766 } 2767 } 2768 2769 private transient volatile SoftReference<ReflectionData<T>> reflectionData; 2770 2771 // Incremented by the VM on each call to JVM TI RedefineClasses() 2772 // that redefines this class or a superclass. 2773 private transient volatile int classRedefinedCount; 2774 2775 // Lazily create and cache ReflectionData 2776 private ReflectionData<T> reflectionData() { 2777 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData; 2778 int classRedefinedCount = this.classRedefinedCount; 2779 ReflectionData<T> rd; 2780 if (reflectionData != null && 2781 (rd = reflectionData.get()) != null && 2782 rd.redefinedCount == classRedefinedCount) { 2783 return rd; 2784 } 2785 // else no SoftReference or cleared SoftReference or stale ReflectionData 2786 // -> create and replace new instance 2787 return newReflectionData(reflectionData, classRedefinedCount); 2788 } 2789 2790 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData, 2791 int classRedefinedCount) { 2792 while (true) { 2793 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount); 2794 // try to CAS it... 2795 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) { 2796 return rd; 2797 } 2798 // else retry 2799 oldReflectionData = this.reflectionData; 2800 classRedefinedCount = this.classRedefinedCount; 2801 if (oldReflectionData != null && 2802 (rd = oldReflectionData.get()) != null && 2803 rd.redefinedCount == classRedefinedCount) { 2804 return rd; 2805 } 2806 } 2807 } 2808 2809 // Generic signature handling 2810 private native String getGenericSignature0(); 2811 2812 // Generic info repository; lazily initialized 2813 private transient volatile ClassRepository genericInfo; 2814 2815 // accessor for factory 2816 private GenericsFactory getFactory() { 2817 // create scope and factory 2818 return CoreReflectionFactory.make(this, ClassScope.make(this)); 2819 } 2820 2821 // accessor for generic info repository; 2822 // generic info is lazily initialized 2823 private ClassRepository getGenericInfo() { 2824 ClassRepository genericInfo = this.genericInfo; 2825 if (genericInfo == null) { 2826 String signature = getGenericSignature0(); 2827 if (signature == null) { 2828 genericInfo = ClassRepository.NONE; 2829 } else { 2830 genericInfo = ClassRepository.make(signature, getFactory()); 2831 } 2832 this.genericInfo = genericInfo; 2833 } 2834 return (genericInfo != ClassRepository.NONE) ? genericInfo : null; 2835 } 2836 2837 // Annotations handling 2838 native byte[] getRawAnnotations(); 2839 // Since 1.8 2840 native byte[] getRawTypeAnnotations(); 2841 static byte[] getExecutableTypeAnnotationBytes(Executable ex) { 2842 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex); 2843 } 2844 2845 native ConstantPool getConstantPool(); 2846 2847 // 2848 // 2849 // java.lang.reflect.Field handling 2850 // 2851 // 2852 2853 // Returns an array of "root" fields. These Field objects must NOT 2854 // be propagated to the outside world, but must instead be copied 2855 // via ReflectionFactory.copyField. 2856 private Field[] privateGetDeclaredFields(boolean publicOnly) { 2857 Field[] res; 2858 ReflectionData<T> rd = reflectionData(); 2859 if (rd != null) { 2860 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields; 2861 if (res != null) return res; 2862 } 2863 // No cached value available; request value from VM 2864 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly)); 2865 if (rd != null) { 2866 if (publicOnly) { 2867 rd.declaredPublicFields = res; 2868 } else { 2869 rd.declaredFields = res; 2870 } 2871 } 2872 return res; 2873 } 2874 2875 // Returns an array of "root" fields. These Field objects must NOT 2876 // be propagated to the outside world, but must instead be copied 2877 // via ReflectionFactory.copyField. 2878 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) { 2879 Field[] res; 2880 ReflectionData<T> rd = reflectionData(); 2881 if (rd != null) { 2882 res = rd.publicFields; 2883 if (res != null) return res; 2884 } 2885 2886 // No cached value available; compute value recursively. 2887 // Traverse in correct order for getField(). 2888 List<Field> fields = new ArrayList<>(); 2889 if (traversedInterfaces == null) { 2890 traversedInterfaces = new HashSet<>(); 2891 } 2892 2893 // Local fields 2894 Field[] tmp = privateGetDeclaredFields(true); 2895 addAll(fields, tmp); 2896 2897 // Direct superinterfaces, recursively 2898 for (Class<?> c : getInterfaces()) { 2899 if (!traversedInterfaces.contains(c)) { 2900 traversedInterfaces.add(c); 2901 addAll(fields, c.privateGetPublicFields(traversedInterfaces)); 2902 } 2903 } 2904 2905 // Direct superclass, recursively 2906 if (!isInterface()) { 2907 Class<?> c = getSuperclass(); 2908 if (c != null) { 2909 addAll(fields, c.privateGetPublicFields(traversedInterfaces)); 2910 } 2911 } 2912 2913 res = new Field[fields.size()]; 2914 fields.toArray(res); 2915 if (rd != null) { 2916 rd.publicFields = res; 2917 } 2918 return res; 2919 } 2920 2921 private static void addAll(Collection<Field> c, Field[] o) { 2922 for (Field f : o) { 2923 c.add(f); 2924 } 2925 } 2926 2927 2928 // 2929 // 2930 // java.lang.reflect.Constructor handling 2931 // 2932 // 2933 2934 // Returns an array of "root" constructors. These Constructor 2935 // objects must NOT be propagated to the outside world, but must 2936 // instead be copied via ReflectionFactory.copyConstructor. 2937 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) { 2938 Constructor<T>[] res; 2939 ReflectionData<T> rd = reflectionData(); 2940 if (rd != null) { 2941 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors; 2942 if (res != null) return res; 2943 } 2944 // No cached value available; request value from VM 2945 if (isInterface()) { 2946 @SuppressWarnings("unchecked") 2947 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0]; 2948 res = temporaryRes; 2949 } else { 2950 res = getDeclaredConstructors0(publicOnly); 2951 } 2952 if (rd != null) { 2953 if (publicOnly) { 2954 rd.publicConstructors = res; 2955 } else { 2956 rd.declaredConstructors = res; 2957 } 2958 } 2959 return res; 2960 } 2961 2962 // 2963 // 2964 // java.lang.reflect.Method handling 2965 // 2966 // 2967 2968 // Returns an array of "root" methods. These Method objects must NOT 2969 // be propagated to the outside world, but must instead be copied 2970 // via ReflectionFactory.copyMethod. 2971 private Method[] privateGetDeclaredMethods(boolean publicOnly) { 2972 Method[] res; 2973 ReflectionData<T> rd = reflectionData(); 2974 if (rd != null) { 2975 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods; 2976 if (res != null) return res; 2977 } 2978 // No cached value available; request value from VM 2979 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly)); 2980 if (rd != null) { 2981 if (publicOnly) { 2982 rd.declaredPublicMethods = res; 2983 } else { 2984 rd.declaredMethods = res; 2985 } 2986 } 2987 return res; 2988 } 2989 2990 static class MethodArray { 2991 // Don't add or remove methods except by add() or remove() calls. 2992 private Method[] methods; 2993 private int length; 2994 private int defaults; 2995 2996 MethodArray() { 2997 this(20); 2998 } 2999 3000 MethodArray(int initialSize) { 3001 if (initialSize < 2) 3002 throw new IllegalArgumentException("Size should be 2 or more"); 3003 3004 methods = new Method[initialSize]; 3005 length = 0; 3006 defaults = 0; 3007 } 3008 3009 boolean hasDefaults() { 3010 return defaults != 0; 3011 } 3012 3013 void add(Method m) { 3014 if (length == methods.length) { 3015 methods = Arrays.copyOf(methods, 2 * methods.length); 3016 } 3017 methods[length++] = m; 3018 3019 if (m != null && m.isDefault()) 3020 defaults++; 3021 } 3022 3023 void addAll(Method[] ma) { 3024 for (Method m : ma) { 3025 add(m); 3026 } 3027 } 3028 3029 void addAll(MethodArray ma) { 3030 for (int i = 0; i < ma.length(); i++) { 3031 add(ma.get(i)); 3032 } 3033 } 3034 3035 void addIfNotPresent(Method newMethod) { 3036 for (int i = 0; i < length; i++) { 3037 Method m = methods[i]; 3038 if (m == newMethod || (m != null && m.equals(newMethod))) { 3039 return; 3040 } 3041 } 3042 add(newMethod); 3043 } 3044 3045 void addAllIfNotPresent(MethodArray newMethods) { 3046 for (int i = 0; i < newMethods.length(); i++) { 3047 Method m = newMethods.get(i); 3048 if (m != null) { 3049 addIfNotPresent(m); 3050 } 3051 } 3052 } 3053 3054 /* Add Methods declared in an interface to this MethodArray. 3055 * Static methods declared in interfaces are not inherited. 3056 */ 3057 void addInterfaceMethods(Method[] methods) { 3058 for (Method candidate : methods) { 3059 if (!Modifier.isStatic(candidate.getModifiers())) { 3060 add(candidate); 3061 } 3062 } 3063 } 3064 3065 int length() { 3066 return length; 3067 } 3068 3069 Method get(int i) { 3070 return methods[i]; 3071 } 3072 3073 Method getFirst() { 3074 for (Method m : methods) 3075 if (m != null) 3076 return m; 3077 return null; 3078 } 3079 3080 void removeByNameAndDescriptor(Method toRemove) { 3081 for (int i = 0; i < length; i++) { 3082 Method m = methods[i]; 3083 if (m != null && matchesNameAndDescriptor(m, toRemove)) { 3084 remove(i); 3085 } 3086 } 3087 } 3088 3089 private void remove(int i) { 3090 if (methods[i] != null && methods[i].isDefault()) 3091 defaults--; 3092 methods[i] = null; 3093 } 3094 3095 private boolean matchesNameAndDescriptor(Method m1, Method m2) { 3096 return m1.getReturnType() == m2.getReturnType() && 3097 m1.getName() == m2.getName() && // name is guaranteed to be interned 3098 arrayContentsEq(m1.getParameterTypes(), 3099 m2.getParameterTypes()); 3100 } 3101 3102 void compactAndTrim() { 3103 int newPos = 0; 3104 // Get rid of null slots 3105 for (int pos = 0; pos < length; pos++) { 3106 Method m = methods[pos]; 3107 if (m != null) { 3108 if (pos != newPos) { 3109 methods[newPos] = m; 3110 } 3111 newPos++; 3112 } 3113 } 3114 if (newPos != methods.length) { 3115 methods = Arrays.copyOf(methods, newPos); 3116 } 3117 } 3118 3119 /* Removes all Methods from this MethodArray that have a more specific 3120 * default Method in this MethodArray. 3121 * 3122 * Users of MethodArray are responsible for pruning Methods that have 3123 * a more specific <em>concrete</em> Method. 3124 */ 3125 void removeLessSpecifics() { 3126 if (!hasDefaults()) 3127 return; 3128 3129 for (int i = 0; i < length; i++) { 3130 Method m = get(i); 3131 if (m == null || !m.isDefault()) 3132 continue; 3133 3134 for (int j = 0; j < length; j++) { 3135 if (i == j) 3136 continue; 3137 3138 Method candidate = get(j); 3139 if (candidate == null) 3140 continue; 3141 3142 if (!matchesNameAndDescriptor(m, candidate)) 3143 continue; 3144 3145 if (hasMoreSpecificClass(m, candidate)) 3146 remove(j); 3147 } 3148 } 3149 } 3150 3151 Method[] getArray() { 3152 return methods; 3153 } 3154 3155 // Returns true if m1 is more specific than m2 3156 static boolean hasMoreSpecificClass(Method m1, Method m2) { 3157 Class<?> m1Class = m1.getDeclaringClass(); 3158 Class<?> m2Class = m2.getDeclaringClass(); 3159 return m1Class != m2Class && m2Class.isAssignableFrom(m1Class); 3160 } 3161 } 3162 3163 3164 // Returns an array of "root" methods. These Method objects must NOT 3165 // be propagated to the outside world, but must instead be copied 3166 // via ReflectionFactory.copyMethod. 3167 private Method[] privateGetPublicMethods() { 3168 Method[] res; 3169 ReflectionData<T> rd = reflectionData(); 3170 if (rd != null) { 3171 res = rd.publicMethods; 3172 if (res != null) return res; 3173 } 3174 3175 // No cached value available; compute value recursively. 3176 // Start by fetching public declared methods 3177 MethodArray methods = new MethodArray(); 3178 { 3179 Method[] tmp = privateGetDeclaredMethods(true); 3180 methods.addAll(tmp); 3181 } 3182 // Now recur over superclass and direct superinterfaces. 3183 // Go over superinterfaces first so we can more easily filter 3184 // out concrete implementations inherited from superclasses at 3185 // the end. 3186 MethodArray inheritedMethods = new MethodArray(); 3187 for (Class<?> i : getInterfaces()) { 3188 inheritedMethods.addInterfaceMethods(i.privateGetPublicMethods()); 3189 } 3190 if (!isInterface()) { 3191 Class<?> c = getSuperclass(); 3192 if (c != null) { 3193 MethodArray supers = new MethodArray(); 3194 supers.addAll(c.privateGetPublicMethods()); 3195 // Filter out concrete implementations of any 3196 // interface methods 3197 for (int i = 0; i < supers.length(); i++) { 3198 Method m = supers.get(i); 3199 if (m != null && 3200 !Modifier.isAbstract(m.getModifiers()) && 3201 !m.isDefault()) { 3202 inheritedMethods.removeByNameAndDescriptor(m); 3203 } 3204 } 3205 // Insert superclass's inherited methods before 3206 // superinterfaces' to satisfy getMethod's search 3207 // order 3208 supers.addAll(inheritedMethods); 3209 inheritedMethods = supers; 3210 } 3211 } 3212 // Filter out all local methods from inherited ones 3213 for (int i = 0; i < methods.length(); i++) { 3214 Method m = methods.get(i); 3215 inheritedMethods.removeByNameAndDescriptor(m); 3216 } 3217 methods.addAllIfNotPresent(inheritedMethods); 3218 methods.removeLessSpecifics(); 3219 methods.compactAndTrim(); 3220 res = methods.getArray(); 3221 if (rd != null) { 3222 rd.publicMethods = res; 3223 } 3224 return res; 3225 } 3226 3227 3228 // 3229 // Helpers for fetchers of one field, method, or constructor 3230 // 3231 3232 private static Field searchFields(Field[] fields, String name) { 3233 String internedName = name.intern(); 3234 for (Field field : fields) { 3235 if (field.getName() == internedName) { 3236 return getReflectionFactory().copyField(field); 3237 } 3238 } 3239 return null; 3240 } 3241 3242 private Field getField0(String name) throws NoSuchFieldException { 3243 // Note: the intent is that the search algorithm this routine 3244 // uses be equivalent to the ordering imposed by 3245 // privateGetPublicFields(). It fetches only the declared 3246 // public fields for each class, however, to reduce the number 3247 // of Field objects which have to be created for the common 3248 // case where the field being requested is declared in the 3249 // class which is being queried. 3250 Field res; 3251 // Search declared public fields 3252 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) { 3253 return res; 3254 } 3255 // Direct superinterfaces, recursively 3256 Class<?>[] interfaces = getInterfaces(); 3257 for (Class<?> c : interfaces) { 3258 if ((res = c.getField0(name)) != null) { 3259 return res; 3260 } 3261 } 3262 // Direct superclass, recursively 3263 if (!isInterface()) { 3264 Class<?> c = getSuperclass(); 3265 if (c != null) { 3266 if ((res = c.getField0(name)) != null) { 3267 return res; 3268 } 3269 } 3270 } 3271 return null; 3272 } 3273 3274 private static Method searchMethods(Method[] methods, 3275 String name, 3276 Class<?>[] parameterTypes) 3277 { 3278 Method res = null; 3279 String internedName = name.intern(); 3280 for (Method m : methods) { 3281 if (m.getName() == internedName 3282 && arrayContentsEq(parameterTypes, m.getParameterTypes()) 3283 && (res == null 3284 || res.getReturnType().isAssignableFrom(m.getReturnType()))) 3285 res = m; 3286 } 3287 3288 return (res == null ? res : getReflectionFactory().copyMethod(res)); 3289 } 3290 3291 private Method getMethod0(String name, Class<?>[] parameterTypes, boolean includeStaticMethods) { 3292 MethodArray interfaceCandidates = new MethodArray(2); 3293 Method res = privateGetMethodRecursive(name, parameterTypes, includeStaticMethods, interfaceCandidates); 3294 if (res != null) 3295 return res; 3296 3297 // Not found on class or superclass directly 3298 interfaceCandidates.removeLessSpecifics(); 3299 return interfaceCandidates.getFirst(); // may be null 3300 } 3301 3302 private Method privateGetMethodRecursive(String name, 3303 Class<?>[] parameterTypes, 3304 boolean includeStaticMethods, 3305 MethodArray allInterfaceCandidates) { 3306 // Note: the intent is that the search algorithm this routine 3307 // uses be equivalent to the ordering imposed by 3308 // privateGetPublicMethods(). It fetches only the declared 3309 // public methods for each class, however, to reduce the 3310 // number of Method objects which have to be created for the 3311 // common case where the method being requested is declared in 3312 // the class which is being queried. 3313 // 3314 // Due to default methods, unless a method is found on a superclass, 3315 // methods declared in any superinterface needs to be considered. 3316 // Collect all candidates declared in superinterfaces in {@code 3317 // allInterfaceCandidates} and select the most specific if no match on 3318 // a superclass is found. 3319 3320 // Must _not_ return root methods 3321 Method res; 3322 // Search declared public methods 3323 if ((res = searchMethods(privateGetDeclaredMethods(true), 3324 name, 3325 parameterTypes)) != null) { 3326 if (includeStaticMethods || !Modifier.isStatic(res.getModifiers())) 3327 return res; 3328 } 3329 // Search superclass's methods 3330 if (!isInterface()) { 3331 Class<? super T> c = getSuperclass(); 3332 if (c != null) { 3333 if ((res = c.getMethod0(name, parameterTypes, true)) != null) { 3334 return res; 3335 } 3336 } 3337 } 3338 // Search superinterfaces' methods 3339 Class<?>[] interfaces = getInterfaces(); 3340 for (Class<?> c : interfaces) 3341 if ((res = c.getMethod0(name, parameterTypes, false)) != null) 3342 allInterfaceCandidates.add(res); 3343 // Not found 3344 return null; 3345 } 3346 3347 private Constructor<T> getConstructor0(Class<?>[] parameterTypes, 3348 int which) throws NoSuchMethodException 3349 { 3350 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC)); 3351 for (Constructor<T> constructor : constructors) { 3352 if (arrayContentsEq(parameterTypes, 3353 constructor.getParameterTypes())) { 3354 return getReflectionFactory().copyConstructor(constructor); 3355 } 3356 } 3357 throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes)); 3358 } 3359 3360 // 3361 // Other helpers and base implementation 3362 // 3363 3364 private static boolean arrayContentsEq(Object[] a1, Object[] a2) { 3365 if (a1 == null) { 3366 return a2 == null || a2.length == 0; 3367 } 3368 3369 if (a2 == null) { 3370 return a1.length == 0; 3371 } 3372 3373 if (a1.length != a2.length) { 3374 return false; 3375 } 3376 3377 for (int i = 0; i < a1.length; i++) { 3378 if (a1[i] != a2[i]) { 3379 return false; 3380 } 3381 } 3382 3383 return true; 3384 } 3385 3386 private static Field[] copyFields(Field[] arg) { 3387 Field[] out = new Field[arg.length]; 3388 ReflectionFactory fact = getReflectionFactory(); 3389 for (int i = 0; i < arg.length; i++) { 3390 out[i] = fact.copyField(arg[i]); 3391 } 3392 return out; 3393 } 3394 3395 private static Method[] copyMethods(Method[] arg) { 3396 Method[] out = new Method[arg.length]; 3397 ReflectionFactory fact = getReflectionFactory(); 3398 for (int i = 0; i < arg.length; i++) { 3399 out[i] = fact.copyMethod(arg[i]); 3400 } 3401 return out; 3402 } 3403 3404 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) { 3405 Constructor<U>[] out = arg.clone(); 3406 ReflectionFactory fact = getReflectionFactory(); 3407 for (int i = 0; i < out.length; i++) { 3408 out[i] = fact.copyConstructor(out[i]); 3409 } 3410 return out; 3411 } 3412 3413 private native Field[] getDeclaredFields0(boolean publicOnly); 3414 private native Method[] getDeclaredMethods0(boolean publicOnly); 3415 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly); 3416 private native Class<?>[] getDeclaredClasses0(); 3417 3418 private static String argumentTypesToString(Class<?>[] argTypes) { 3419 StringJoiner sj = new StringJoiner(", ", "(", ")"); 3420 if (argTypes != null) { 3421 for (int i = 0; i < argTypes.length; i++) { 3422 Class<?> c = argTypes[i]; 3423 sj.add((c == null) ? "null" : c.getName()); 3424 } 3425 } 3426 return sj.toString(); 3427 } 3428 3429 /** use serialVersionUID from JDK 1.1 for interoperability */ 3430 private static final long serialVersionUID = 3206093459760846163L; 3431 3432 3433 /** 3434 * Class Class is special cased within the Serialization Stream Protocol. 3435 * 3436 * A Class instance is written initially into an ObjectOutputStream in the 3437 * following format: 3438 * <pre> 3439 * {@code TC_CLASS} ClassDescriptor 3440 * A ClassDescriptor is a special cased serialization of 3441 * a {@code java.io.ObjectStreamClass} instance. 3442 * </pre> 3443 * A new handle is generated for the initial time the class descriptor 3444 * is written into the stream. Future references to the class descriptor 3445 * are written as references to the initial class descriptor instance. 3446 * 3447 * @see java.io.ObjectStreamClass 3448 */ 3449 private static final ObjectStreamField[] serialPersistentFields = 3450 new ObjectStreamField[0]; 3451 3452 3453 /** 3454 * Returns the assertion status that would be assigned to this 3455 * class if it were to be initialized at the time this method is invoked. 3456 * If this class has had its assertion status set, the most recent 3457 * setting will be returned; otherwise, if any package default assertion 3458 * status pertains to this class, the most recent setting for the most 3459 * specific pertinent package default assertion status is returned; 3460 * otherwise, if this class is not a system class (i.e., it has a 3461 * class loader) its class loader's default assertion status is returned; 3462 * otherwise, the system class default assertion status is returned. 3463 * <p> 3464 * Few programmers will have any need for this method; it is provided 3465 * for the benefit of the JRE itself. (It allows a class to determine at 3466 * the time that it is initialized whether assertions should be enabled.) 3467 * Note that this method is not guaranteed to return the actual 3468 * assertion status that was (or will be) associated with the specified 3469 * class when it was (or will be) initialized. 3470 * 3471 * @return the desired assertion status of the specified class. 3472 * @see java.lang.ClassLoader#setClassAssertionStatus 3473 * @see java.lang.ClassLoader#setPackageAssertionStatus 3474 * @see java.lang.ClassLoader#setDefaultAssertionStatus 3475 * @since 1.4 3476 */ 3477 public boolean desiredAssertionStatus() { 3478 ClassLoader loader = getClassLoader0(); 3479 // If the loader is null this is a system class, so ask the VM 3480 if (loader == null) 3481 return desiredAssertionStatus0(this); 3482 3483 // If the classloader has been initialized with the assertion 3484 // directives, ask it. Otherwise, ask the VM. 3485 synchronized(loader.assertionLock) { 3486 if (loader.classAssertionStatus != null) { 3487 return loader.desiredAssertionStatus(getName()); 3488 } 3489 } 3490 return desiredAssertionStatus0(this); 3491 } 3492 3493 // Retrieves the desired assertion status of this class from the VM 3494 private static native boolean desiredAssertionStatus0(Class<?> clazz); 3495 3496 /** 3497 * Returns true if and only if this class was declared as an enum in the 3498 * source code. 3499 * 3500 * @return true if and only if this class was declared as an enum in the 3501 * source code 3502 * @since 1.5 3503 */ 3504 public boolean isEnum() { 3505 // An enum must both directly extend java.lang.Enum and have 3506 // the ENUM bit set; classes for specialized enum constants 3507 // don't do the former. 3508 return (this.getModifiers() & ENUM) != 0 && 3509 this.getSuperclass() == java.lang.Enum.class; 3510 } 3511 3512 // Fetches the factory for reflective objects 3513 private static ReflectionFactory getReflectionFactory() { 3514 if (reflectionFactory == null) { 3515 reflectionFactory = 3516 java.security.AccessController.doPrivileged 3517 (new ReflectionFactory.GetReflectionFactoryAction()); 3518 } 3519 return reflectionFactory; 3520 } 3521 private static ReflectionFactory reflectionFactory; 3522 3523 /** 3524 * Returns the elements of this enum class or null if this 3525 * Class object does not represent an enum type. 3526 * 3527 * @return an array containing the values comprising the enum class 3528 * represented by this Class object in the order they're 3529 * declared, or null if this Class object does not 3530 * represent an enum type 3531 * @since 1.5 3532 */ 3533 public T[] getEnumConstants() { 3534 T[] values = getEnumConstantsShared(); 3535 return (values != null) ? values.clone() : null; 3536 } 3537 3538 /** 3539 * Returns the elements of this enum class or null if this 3540 * Class object does not represent an enum type; 3541 * identical to getEnumConstants except that the result is 3542 * uncloned, cached, and shared by all callers. 3543 */ 3544 T[] getEnumConstantsShared() { 3545 T[] constants = enumConstants; 3546 if (constants == null) { 3547 if (!isEnum()) return null; 3548 try { 3549 final Method values = getMethod("values"); 3550 java.security.AccessController.doPrivileged( 3551 new java.security.PrivilegedAction<>() { 3552 public Void run() { 3553 values.setAccessible(true); 3554 return null; 3555 } 3556 }); 3557 @SuppressWarnings("unchecked") 3558 T[] temporaryConstants = (T[])values.invoke(null); 3559 enumConstants = constants = temporaryConstants; 3560 } 3561 // These can happen when users concoct enum-like classes 3562 // that don't comply with the enum spec. 3563 catch (InvocationTargetException | NoSuchMethodException | 3564 IllegalAccessException ex) { return null; } 3565 } 3566 return constants; 3567 } 3568 private transient volatile T[] enumConstants; 3569 3570 /** 3571 * Returns a map from simple name to enum constant. This package-private 3572 * method is used internally by Enum to implement 3573 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)} 3574 * efficiently. Note that the map is returned by this method is 3575 * created lazily on first use. Typically it won't ever get created. 3576 */ 3577 Map<String, T> enumConstantDirectory() { 3578 Map<String, T> directory = enumConstantDirectory; 3579 if (directory == null) { 3580 T[] universe = getEnumConstantsShared(); 3581 if (universe == null) 3582 throw new IllegalArgumentException( 3583 getName() + " is not an enum type"); 3584 directory = new HashMap<>(2 * universe.length); 3585 for (T constant : universe) { 3586 directory.put(((Enum<?>)constant).name(), constant); 3587 } 3588 enumConstantDirectory = directory; 3589 } 3590 return directory; 3591 } 3592 private transient volatile Map<String, T> enumConstantDirectory; 3593 3594 /** 3595 * Casts an object to the class or interface represented 3596 * by this {@code Class} object. 3597 * 3598 * @param obj the object to be cast 3599 * @return the object after casting, or null if obj is null 3600 * 3601 * @throws ClassCastException if the object is not 3602 * null and is not assignable to the type T. 3603 * 3604 * @since 1.5 3605 */ 3606 @SuppressWarnings("unchecked") 3607 @HotSpotIntrinsicCandidate 3608 public T cast(Object obj) { 3609 if (obj != null && !isInstance(obj)) 3610 throw new ClassCastException(cannotCastMsg(obj)); 3611 return (T) obj; 3612 } 3613 3614 private String cannotCastMsg(Object obj) { 3615 return "Cannot cast " + obj.getClass().getName() + " to " + getName(); 3616 } 3617 3618 /** 3619 * Casts this {@code Class} object to represent a subclass of the class 3620 * represented by the specified class object. Checks that the cast 3621 * is valid, and throws a {@code ClassCastException} if it is not. If 3622 * this method succeeds, it always returns a reference to this class object. 3623 * 3624 * <p>This method is useful when a client needs to "narrow" the type of 3625 * a {@code Class} object to pass it to an API that restricts the 3626 * {@code Class} objects that it is willing to accept. A cast would 3627 * generate a compile-time warning, as the correctness of the cast 3628 * could not be checked at runtime (because generic types are implemented 3629 * by erasure). 3630 * 3631 * @param <U> the type to cast this class object to 3632 * @param clazz the class of the type to cast this class object to 3633 * @return this {@code Class} object, cast to represent a subclass of 3634 * the specified class object. 3635 * @throws ClassCastException if this {@code Class} object does not 3636 * represent a subclass of the specified class (here "subclass" includes 3637 * the class itself). 3638 * @since 1.5 3639 */ 3640 @SuppressWarnings("unchecked") 3641 public <U> Class<? extends U> asSubclass(Class<U> clazz) { 3642 if (clazz.isAssignableFrom(this)) 3643 return (Class<? extends U>) this; 3644 else 3645 throw new ClassCastException(this.toString()); 3646 } 3647 3648 /** 3649 * @throws NullPointerException {@inheritDoc} 3650 * @since 1.5 3651 */ 3652 @SuppressWarnings("unchecked") 3653 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) { 3654 Objects.requireNonNull(annotationClass); 3655 3656 return (A) annotationData().annotations.get(annotationClass); 3657 } 3658 3659 /** 3660 * {@inheritDoc} 3661 * @throws NullPointerException {@inheritDoc} 3662 * @since 1.5 3663 */ 3664 @Override 3665 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) { 3666 return GenericDeclaration.super.isAnnotationPresent(annotationClass); 3667 } 3668 3669 /** 3670 * @throws NullPointerException {@inheritDoc} 3671 * @since 1.8 3672 */ 3673 @Override 3674 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) { 3675 Objects.requireNonNull(annotationClass); 3676 3677 AnnotationData annotationData = annotationData(); 3678 return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations, 3679 this, 3680 annotationClass); 3681 } 3682 3683 /** 3684 * @since 1.5 3685 */ 3686 public Annotation[] getAnnotations() { 3687 return AnnotationParser.toArray(annotationData().annotations); 3688 } 3689 3690 /** 3691 * @throws NullPointerException {@inheritDoc} 3692 * @since 1.8 3693 */ 3694 @Override 3695 @SuppressWarnings("unchecked") 3696 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) { 3697 Objects.requireNonNull(annotationClass); 3698 3699 return (A) annotationData().declaredAnnotations.get(annotationClass); 3700 } 3701 3702 /** 3703 * @throws NullPointerException {@inheritDoc} 3704 * @since 1.8 3705 */ 3706 @Override 3707 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) { 3708 Objects.requireNonNull(annotationClass); 3709 3710 return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations, 3711 annotationClass); 3712 } 3713 3714 /** 3715 * @since 1.5 3716 */ 3717 public Annotation[] getDeclaredAnnotations() { 3718 return AnnotationParser.toArray(annotationData().declaredAnnotations); 3719 } 3720 3721 // annotation data that might get invalidated when JVM TI RedefineClasses() is called 3722 private static class AnnotationData { 3723 final Map<Class<? extends Annotation>, Annotation> annotations; 3724 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations; 3725 3726 // Value of classRedefinedCount when we created this AnnotationData instance 3727 final int redefinedCount; 3728 3729 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations, 3730 Map<Class<? extends Annotation>, Annotation> declaredAnnotations, 3731 int redefinedCount) { 3732 this.annotations = annotations; 3733 this.declaredAnnotations = declaredAnnotations; 3734 this.redefinedCount = redefinedCount; 3735 } 3736 } 3737 3738 // Annotations cache 3739 @SuppressWarnings("UnusedDeclaration") 3740 private transient volatile AnnotationData annotationData; 3741 3742 private AnnotationData annotationData() { 3743 while (true) { // retry loop 3744 AnnotationData annotationData = this.annotationData; 3745 int classRedefinedCount = this.classRedefinedCount; 3746 if (annotationData != null && 3747 annotationData.redefinedCount == classRedefinedCount) { 3748 return annotationData; 3749 } 3750 // null or stale annotationData -> optimistically create new instance 3751 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount); 3752 // try to install it 3753 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) { 3754 // successfully installed new AnnotationData 3755 return newAnnotationData; 3756 } 3757 } 3758 } 3759 3760 private AnnotationData createAnnotationData(int classRedefinedCount) { 3761 Map<Class<? extends Annotation>, Annotation> declaredAnnotations = 3762 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this); 3763 Class<?> superClass = getSuperclass(); 3764 Map<Class<? extends Annotation>, Annotation> annotations = null; 3765 if (superClass != null) { 3766 Map<Class<? extends Annotation>, Annotation> superAnnotations = 3767 superClass.annotationData().annotations; 3768 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) { 3769 Class<? extends Annotation> annotationClass = e.getKey(); 3770 if (AnnotationType.getInstance(annotationClass).isInherited()) { 3771 if (annotations == null) { // lazy construction 3772 annotations = new LinkedHashMap<>((Math.max( 3773 declaredAnnotations.size(), 3774 Math.min(12, declaredAnnotations.size() + superAnnotations.size()) 3775 ) * 4 + 2) / 3 3776 ); 3777 } 3778 annotations.put(annotationClass, e.getValue()); 3779 } 3780 } 3781 } 3782 if (annotations == null) { 3783 // no inherited annotations -> share the Map with declaredAnnotations 3784 annotations = declaredAnnotations; 3785 } else { 3786 // at least one inherited annotation -> declared may override inherited 3787 annotations.putAll(declaredAnnotations); 3788 } 3789 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount); 3790 } 3791 3792 // Annotation types cache their internal (AnnotationType) form 3793 3794 @SuppressWarnings("UnusedDeclaration") 3795 private transient volatile AnnotationType annotationType; 3796 3797 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) { 3798 return Atomic.casAnnotationType(this, oldType, newType); 3799 } 3800 3801 AnnotationType getAnnotationType() { 3802 return annotationType; 3803 } 3804 3805 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() { 3806 return annotationData().declaredAnnotations; 3807 } 3808 3809 /* Backing store of user-defined values pertaining to this class. 3810 * Maintained by the ClassValue class. 3811 */ 3812 transient ClassValue.ClassValueMap classValueMap; 3813 3814 /** 3815 * Returns an {@code AnnotatedType} object that represents the use of a 3816 * type to specify the superclass of the entity represented by this {@code 3817 * Class} object. (The <em>use</em> of type Foo to specify the superclass 3818 * in '... extends Foo' is distinct from the <em>declaration</em> of type 3819 * Foo.) 3820 * 3821 * <p> If this {@code Class} object represents a type whose declaration 3822 * does not explicitly indicate an annotated superclass, then the return 3823 * value is an {@code AnnotatedType} object representing an element with no 3824 * annotations. 3825 * 3826 * <p> If this {@code Class} represents either the {@code Object} class, an 3827 * interface type, an array type, a primitive type, or void, the return 3828 * value is {@code null}. 3829 * 3830 * @return an object representing the superclass 3831 * @since 1.8 3832 */ 3833 public AnnotatedType getAnnotatedSuperclass() { 3834 if (this == Object.class || 3835 isInterface() || 3836 isArray() || 3837 isPrimitive() || 3838 this == Void.TYPE) { 3839 return null; 3840 } 3841 3842 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this); 3843 } 3844 3845 /** 3846 * Returns an array of {@code AnnotatedType} objects that represent the use 3847 * of types to specify superinterfaces of the entity represented by this 3848 * {@code Class} object. (The <em>use</em> of type Foo to specify a 3849 * superinterface in '... implements Foo' is distinct from the 3850 * <em>declaration</em> of type Foo.) 3851 * 3852 * <p> If this {@code Class} object represents a class, the return value is 3853 * an array containing objects representing the uses of interface types to 3854 * specify interfaces implemented by the class. The order of the objects in 3855 * the array corresponds to the order of the interface types used in the 3856 * 'implements' clause of the declaration of this {@code Class} object. 3857 * 3858 * <p> If this {@code Class} object represents an interface, the return 3859 * value is an array containing objects representing the uses of interface 3860 * types to specify interfaces directly extended by the interface. The 3861 * order of the objects in the array corresponds to the order of the 3862 * interface types used in the 'extends' clause of the declaration of this 3863 * {@code Class} object. 3864 * 3865 * <p> If this {@code Class} object represents a class or interface whose 3866 * declaration does not explicitly indicate any annotated superinterfaces, 3867 * the return value is an array of length 0. 3868 * 3869 * <p> If this {@code Class} object represents either the {@code Object} 3870 * class, an array type, a primitive type, or void, the return value is an 3871 * array of length 0. 3872 * 3873 * @return an array representing the superinterfaces 3874 * @since 1.8 3875 */ 3876 public AnnotatedType[] getAnnotatedInterfaces() { 3877 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this); 3878 } 3879 }