1 /* 2 * Copyright (c) 1994, 2012, 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.reflect.Array; 29 import java.lang.reflect.GenericArrayType; 30 import java.lang.reflect.Member; 31 import java.lang.reflect.Field; 32 import java.lang.reflect.Method; 33 import java.lang.reflect.Constructor; 34 import java.lang.reflect.Modifier; 35 import java.lang.reflect.Type; 36 import java.lang.reflect.TypeVariable; 37 import java.lang.reflect.InvocationTargetException; 38 import java.lang.ref.SoftReference; 39 import java.io.InputStream; 40 import java.io.ObjectStreamField; 41 import java.security.AccessController; 42 import java.security.PrivilegedAction; 43 import java.util.ArrayList; 44 import java.util.Arrays; 45 import java.util.Collection; 46 import java.util.HashSet; 47 import java.util.List; 48 import java.util.Set; 49 import java.util.Map; 50 import java.util.HashMap; 51 import java.util.Objects; 52 import sun.misc.Unsafe; 53 import sun.reflect.ConstantPool; 54 import sun.reflect.Reflection; 55 import sun.reflect.ReflectionFactory; 56 import sun.reflect.generics.factory.CoreReflectionFactory; 57 import sun.reflect.generics.factory.GenericsFactory; 58 import sun.reflect.generics.repository.ClassRepository; 59 import sun.reflect.generics.repository.MethodRepository; 60 import sun.reflect.generics.repository.ConstructorRepository; 61 import sun.reflect.generics.scope.ClassScope; 62 import sun.security.util.SecurityConstants; 63 import java.lang.annotation.Annotation; 64 import sun.reflect.annotation.*; 65 66 /** 67 * Instances of the class {@code Class} represent classes and 68 * interfaces in a running Java application. An enum is a kind of 69 * class and an annotation is a kind of interface. Every array also 70 * belongs to a class that is reflected as a {@code Class} object 71 * that is shared by all arrays with the same element type and number 72 * of dimensions. The primitive Java types ({@code boolean}, 73 * {@code byte}, {@code char}, {@code short}, 74 * {@code int}, {@code long}, {@code float}, and 75 * {@code double}), and the keyword {@code void} are also 76 * represented as {@code Class} objects. 77 * 78 * <p> {@code Class} has no public constructor. Instead {@code Class} 79 * objects are constructed automatically by the Java Virtual Machine as classes 80 * are loaded and by calls to the {@code defineClass} method in the class 81 * loader. 82 * 83 * <p> The following example uses a {@code Class} object to print the 84 * class name of an object: 85 * 86 * <p> <blockquote><pre> 87 * void printClassName(Object obj) { 88 * System.out.println("The class of " + obj + 89 * " is " + obj.getClass().getName()); 90 * } 91 * </pre></blockquote> 92 * 93 * <p> It is also possible to get the {@code Class} object for a named 94 * type (or for void) using a class literal. See Section 15.8.2 of 95 * <cite>The Java™ Language Specification</cite>. 96 * For example: 97 * 98 * <p> <blockquote> 99 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} 100 * </blockquote> 101 * 102 * @param <T> the type of the class modeled by this {@code Class} 103 * object. For example, the type of {@code String.class} is {@code 104 * Class<String>}. Use {@code Class<?>} if the class being modeled is 105 * unknown. 106 * 107 * @author unascribed 108 * @see java.lang.ClassLoader#defineClass(byte[], int, int) 109 * @since JDK1.0 110 */ 111 public final 112 class Class<T> implements java.io.Serializable, 113 java.lang.reflect.GenericDeclaration, 114 java.lang.reflect.Type, 115 java.lang.reflect.AnnotatedElement { 116 private static final int ANNOTATION= 0x00002000; 117 private static final int ENUM = 0x00004000; 118 private static final int SYNTHETIC = 0x00001000; 119 120 private static native void registerNatives(); 121 static { 122 registerNatives(); 123 } 124 125 /* 126 * Constructor. Only the Java Virtual Machine creates Class 127 * objects. 128 */ 129 private Class() {} 130 131 132 /** 133 * Converts the object to a string. The string representation is the 134 * string "class" or "interface", followed by a space, and then by the 135 * fully qualified name of the class in the format returned by 136 * {@code getName}. If this {@code Class} object represents a 137 * primitive type, this method returns the name of the primitive type. If 138 * this {@code Class} object represents void this method returns 139 * "void". 140 * 141 * @return a string representation of this class object. 142 */ 143 public String toString() { 144 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) 145 + getName(); 146 } 147 148 149 /** 150 * Returns the {@code Class} object associated with the class or 151 * interface with the given string name. Invoking this method is 152 * equivalent to: 153 * 154 * <blockquote> 155 * {@code Class.forName(className, true, currentLoader)} 156 * </blockquote> 157 * 158 * where {@code currentLoader} denotes the defining class loader of 159 * the current class. 160 * 161 * <p> For example, the following code fragment returns the 162 * runtime {@code Class} descriptor for the class named 163 * {@code java.lang.Thread}: 164 * 165 * <blockquote> 166 * {@code Class t = Class.forName("java.lang.Thread")} 167 * </blockquote> 168 * <p> 169 * A call to {@code forName("X")} causes the class named 170 * {@code X} to be initialized. 171 * 172 * @param className the fully qualified name of the desired class. 173 * @return the {@code Class} object for the class with the 174 * specified name. 175 * @exception LinkageError if the linkage fails 176 * @exception ExceptionInInitializerError if the initialization provoked 177 * by this method fails 178 * @exception ClassNotFoundException if the class cannot be located 179 */ 180 public static Class<?> forName(String className) 181 throws ClassNotFoundException { 182 return forName0(className, true, ClassLoader.getCallerClassLoader()); 183 } 184 185 186 /** 187 * Returns the {@code Class} object associated with the class or 188 * interface with the given string name, using the given class loader. 189 * Given the fully qualified name for a class or interface (in the same 190 * format returned by {@code getName}) this method attempts to 191 * locate, load, and link the class or interface. The specified class 192 * loader is used to load the class or interface. If the parameter 193 * {@code loader} is null, the class is loaded through the bootstrap 194 * class loader. The class is initialized only if the 195 * {@code initialize} parameter is {@code true} and if it has 196 * not been initialized earlier. 197 * 198 * <p> If {@code name} denotes a primitive type or void, an attempt 199 * will be made to locate a user-defined class in the unnamed package whose 200 * name is {@code name}. Therefore, this method cannot be used to 201 * obtain any of the {@code Class} objects representing primitive 202 * types or void. 203 * 204 * <p> If {@code name} denotes an array class, the component type of 205 * the array class is loaded but not initialized. 206 * 207 * <p> For example, in an instance method the expression: 208 * 209 * <blockquote> 210 * {@code Class.forName("Foo")} 211 * </blockquote> 212 * 213 * is equivalent to: 214 * 215 * <blockquote> 216 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())} 217 * </blockquote> 218 * 219 * Note that this method throws errors related to loading, linking or 220 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The 221 * Java Language Specification</em>. 222 * Note that this method does not check whether the requested class 223 * is accessible to its caller. 224 * 225 * <p> If the {@code loader} is {@code null}, and a security 226 * manager is present, and the caller's class loader is not null, then this 227 * method calls the security manager's {@code checkPermission} method 228 * with a {@code RuntimePermission("getClassLoader")} permission to 229 * ensure it's ok to access the bootstrap class loader. 230 * 231 * @param name fully qualified name of the desired class 232 * @param initialize if {@code true} the class will be initialized. 233 * See Section 12.4 of <em>The Java Language Specification</em>. 234 * @param loader class loader from which the class must be loaded 235 * @return class object representing the desired class 236 * 237 * @exception LinkageError if the linkage fails 238 * @exception ExceptionInInitializerError if the initialization provoked 239 * by this method fails 240 * @exception ClassNotFoundException if the class cannot be located by 241 * the specified class loader 242 * 243 * @see java.lang.Class#forName(String) 244 * @see java.lang.ClassLoader 245 * @since 1.2 246 */ 247 public static Class<?> forName(String name, boolean initialize, 248 ClassLoader loader) 249 throws ClassNotFoundException 250 { 251 if (loader == null) { 252 SecurityManager sm = System.getSecurityManager(); 253 if (sm != null) { 254 ClassLoader ccl = ClassLoader.getCallerClassLoader(); 255 if (ccl != null) { 256 sm.checkPermission( 257 SecurityConstants.GET_CLASSLOADER_PERMISSION); 258 } 259 } 260 } 261 return forName0(name, initialize, loader); 262 } 263 264 /** Called after security checks have been made. */ 265 private static native Class<?> forName0(String name, boolean initialize, 266 ClassLoader loader) 267 throws ClassNotFoundException; 268 269 /** 270 * Creates a new instance of the class represented by this {@code Class} 271 * object. The class is instantiated as if by a {@code new} 272 * expression with an empty argument list. The class is initialized if it 273 * has not already been initialized. 274 * 275 * <p>Note that this method propagates any exception thrown by the 276 * nullary constructor, including a checked exception. Use of 277 * this method effectively bypasses the compile-time exception 278 * checking that would otherwise be performed by the compiler. 279 * The {@link 280 * java.lang.reflect.Constructor#newInstance(java.lang.Object...) 281 * Constructor.newInstance} method avoids this problem by wrapping 282 * any exception thrown by the constructor in a (checked) {@link 283 * java.lang.reflect.InvocationTargetException}. 284 * 285 * @return a newly allocated instance of the class represented by this 286 * object. 287 * @exception IllegalAccessException if the class or its nullary 288 * constructor is not accessible. 289 * @exception InstantiationException 290 * if this {@code Class} represents an abstract class, 291 * an interface, an array class, a primitive type, or void; 292 * or if the class has no nullary constructor; 293 * or if the instantiation fails for some other reason. 294 * @exception ExceptionInInitializerError if the initialization 295 * provoked by this method fails. 296 * @exception SecurityException 297 * If a security manager, <i>s</i>, is present and any of the 298 * following conditions is met: 299 * 300 * <ul> 301 * 302 * <li> invocation of 303 * {@link SecurityManager#checkMemberAccess 304 * s.checkMemberAccess(this, Member.PUBLIC)} denies 305 * creation of new instances of this class 306 * 307 * <li> the caller's class loader is not the same as or an 308 * ancestor of the class loader for the current class and 309 * invocation of {@link SecurityManager#checkPackageAccess 310 * s.checkPackageAccess()} denies access to the package 311 * of this class 312 * 313 * </ul> 314 * 315 */ 316 public T newInstance() 317 throws InstantiationException, IllegalAccessException 318 { 319 if (System.getSecurityManager() != null) { 320 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 321 } 322 return newInstance0(); 323 } 324 325 private T newInstance0() 326 throws InstantiationException, IllegalAccessException 327 { 328 // NOTE: the following code may not be strictly correct under 329 // the current Java memory model. 330 331 // Constructor lookup 332 if (cachedConstructor == null) { 333 if (this == Class.class) { 334 throw new IllegalAccessException( 335 "Can not call newInstance() on the Class for java.lang.Class" 336 ); 337 } 338 try { 339 Class<?>[] empty = {}; 340 final Constructor<T> c = getConstructor0(empty, Member.DECLARED); 341 // Disable accessibility checks on the constructor 342 // since we have to do the security check here anyway 343 // (the stack depth is wrong for the Constructor's 344 // security check to work) 345 java.security.AccessController.doPrivileged( 346 new java.security.PrivilegedAction<Void>() { 347 public Void run() { 348 c.setAccessible(true); 349 return null; 350 } 351 }); 352 cachedConstructor = c; 353 } catch (NoSuchMethodException e) { 354 throw (InstantiationException) 355 new InstantiationException(getName()).initCause(e); 356 } 357 } 358 Constructor<T> tmpConstructor = cachedConstructor; 359 // Security check (same as in java.lang.reflect.Constructor) 360 int modifiers = tmpConstructor.getModifiers(); 361 if (!Reflection.quickCheckMemberAccess(this, modifiers)) { 362 Class<?> caller = Reflection.getCallerClass(3); 363 if (newInstanceCallerCache != caller) { 364 Reflection.ensureMemberAccess(caller, this, null, modifiers); 365 newInstanceCallerCache = caller; 366 } 367 } 368 // Run constructor 369 try { 370 return tmpConstructor.newInstance((Object[])null); 371 } catch (InvocationTargetException e) { 372 Unsafe.getUnsafe().throwException(e.getTargetException()); 373 // Not reached 374 return null; 375 } 376 } 377 private volatile transient Constructor<T> cachedConstructor; 378 private volatile transient Class<?> newInstanceCallerCache; 379 380 381 /** 382 * Determines if the specified {@code Object} is assignment-compatible 383 * with the object represented by this {@code Class}. This method is 384 * the dynamic equivalent of the Java language {@code instanceof} 385 * operator. The method returns {@code true} if the specified 386 * {@code Object} argument is non-null and can be cast to the 387 * reference type represented by this {@code Class} object without 388 * raising a {@code ClassCastException.} It returns {@code false} 389 * otherwise. 390 * 391 * <p> Specifically, if this {@code Class} object represents a 392 * declared class, this method returns {@code true} if the specified 393 * {@code Object} argument is an instance of the represented class (or 394 * of any of its subclasses); it returns {@code false} otherwise. If 395 * this {@code Class} object represents an array class, this method 396 * returns {@code true} if the specified {@code Object} argument 397 * can be converted to an object of the array class by an identity 398 * conversion or by a widening reference conversion; it returns 399 * {@code false} otherwise. If this {@code Class} object 400 * represents an interface, this method returns {@code true} if the 401 * class or any superclass of the specified {@code Object} argument 402 * implements this interface; it returns {@code false} otherwise. If 403 * this {@code Class} object represents a primitive type, this method 404 * returns {@code false}. 405 * 406 * @param obj the object to check 407 * @return true if {@code obj} is an instance of this class 408 * 409 * @since JDK1.1 410 */ 411 public native boolean isInstance(Object obj); 412 413 414 /** 415 * Determines if the class or interface represented by this 416 * {@code Class} object is either the same as, or is a superclass or 417 * superinterface of, the class or interface represented by the specified 418 * {@code Class} parameter. It returns {@code true} if so; 419 * otherwise it returns {@code false}. If this {@code Class} 420 * object represents a primitive type, this method returns 421 * {@code true} if the specified {@code Class} parameter is 422 * exactly this {@code Class} object; otherwise it returns 423 * {@code false}. 424 * 425 * <p> Specifically, this method tests whether the type represented by the 426 * specified {@code Class} parameter can be converted to the type 427 * represented by this {@code Class} object via an identity conversion 428 * or via a widening reference conversion. See <em>The Java Language 429 * Specification</em>, sections 5.1.1 and 5.1.4 , for details. 430 * 431 * @param cls the {@code Class} object to be checked 432 * @return the {@code boolean} value indicating whether objects of the 433 * type {@code cls} can be assigned to objects of this class 434 * @exception NullPointerException if the specified Class parameter is 435 * null. 436 * @since JDK1.1 437 */ 438 public native boolean isAssignableFrom(Class<?> cls); 439 440 441 /** 442 * Determines if the specified {@code Class} object represents an 443 * interface type. 444 * 445 * @return {@code true} if this object represents an interface; 446 * {@code false} otherwise. 447 */ 448 public native boolean isInterface(); 449 450 451 /** 452 * Determines if this {@code Class} object represents an array class. 453 * 454 * @return {@code true} if this object represents an array class; 455 * {@code false} otherwise. 456 * @since JDK1.1 457 */ 458 public native boolean isArray(); 459 460 461 /** 462 * Determines if the specified {@code Class} object represents a 463 * primitive type. 464 * 465 * <p> There are nine predefined {@code Class} objects to represent 466 * the eight primitive types and void. These are created by the Java 467 * Virtual Machine, and have the same names as the primitive types that 468 * they represent, namely {@code boolean}, {@code byte}, 469 * {@code char}, {@code short}, {@code int}, 470 * {@code long}, {@code float}, and {@code double}. 471 * 472 * <p> These objects may only be accessed via the following public static 473 * final variables, and are the only {@code Class} objects for which 474 * this method returns {@code true}. 475 * 476 * @return true if and only if this class represents a primitive type 477 * 478 * @see java.lang.Boolean#TYPE 479 * @see java.lang.Character#TYPE 480 * @see java.lang.Byte#TYPE 481 * @see java.lang.Short#TYPE 482 * @see java.lang.Integer#TYPE 483 * @see java.lang.Long#TYPE 484 * @see java.lang.Float#TYPE 485 * @see java.lang.Double#TYPE 486 * @see java.lang.Void#TYPE 487 * @since JDK1.1 488 */ 489 public native boolean isPrimitive(); 490 491 /** 492 * Returns true if this {@code Class} object represents an annotation 493 * type. Note that if this method returns true, {@link #isInterface()} 494 * would also return true, as all annotation types are also interfaces. 495 * 496 * @return {@code true} if this class object represents an annotation 497 * type; {@code false} otherwise 498 * @since 1.5 499 */ 500 public boolean isAnnotation() { 501 return (getModifiers() & ANNOTATION) != 0; 502 } 503 504 /** 505 * Returns {@code true} if this class is a synthetic class; 506 * returns {@code false} otherwise. 507 * @return {@code true} if and only if this class is a synthetic class as 508 * defined by the Java Language Specification. 509 * @jls 13.1 The Form of a Binary 510 * @since 1.5 511 */ 512 public boolean isSynthetic() { 513 return (getModifiers() & SYNTHETIC) != 0; 514 } 515 516 /** 517 * Returns the name of the entity (class, interface, array class, 518 * primitive type, or void) represented by this {@code Class} object, 519 * as a {@code String}. 520 * 521 * <p> If this class object represents a reference type that is not an 522 * array type then the binary name of the class is returned, as specified 523 * by 524 * <cite>The Java™ Language Specification</cite>. 525 * 526 * <p> If this class object represents a primitive type or void, then the 527 * name returned is a {@code String} equal to the Java language 528 * keyword corresponding to the primitive type or void. 529 * 530 * <p> If this class object represents a class of arrays, then the internal 531 * form of the name consists of the name of the element type preceded by 532 * one or more '{@code [}' characters representing the depth of the array 533 * nesting. The encoding of element type names is as follows: 534 * 535 * <blockquote><table summary="Element types and encodings"> 536 * <tr><th> Element Type <th> <th> Encoding 537 * <tr><td> boolean <td> <td align=center> Z 538 * <tr><td> byte <td> <td align=center> B 539 * <tr><td> char <td> <td align=center> C 540 * <tr><td> class or interface 541 * <td> <td align=center> L<i>classname</i>; 542 * <tr><td> double <td> <td align=center> D 543 * <tr><td> float <td> <td align=center> F 544 * <tr><td> int <td> <td align=center> I 545 * <tr><td> long <td> <td align=center> J 546 * <tr><td> short <td> <td align=center> S 547 * </table></blockquote> 548 * 549 * <p> The class or interface name <i>classname</i> is the binary name of 550 * the class specified above. 551 * 552 * <p> Examples: 553 * <blockquote><pre> 554 * String.class.getName() 555 * returns "java.lang.String" 556 * byte.class.getName() 557 * returns "byte" 558 * (new Object[3]).getClass().getName() 559 * returns "[Ljava.lang.Object;" 560 * (new int[3][4][5][6][7][8][9]).getClass().getName() 561 * returns "[[[[[[[I" 562 * </pre></blockquote> 563 * 564 * @return the name of the class or interface 565 * represented by this object. 566 */ 567 public String getName() { 568 String name = this.name; 569 if (name == null) 570 this.name = name = getName0(); 571 return name; 572 } 573 574 // cache the name to reduce the number of calls into the VM 575 private transient String name; 576 private native String getName0(); 577 578 /** 579 * Returns the class loader for the class. Some implementations may use 580 * null to represent the bootstrap class loader. This method will return 581 * null in such implementations if this class was loaded by the bootstrap 582 * class loader. 583 * 584 * <p> If a security manager is present, and the caller's class loader is 585 * not null and the caller's class loader is not the same as or an ancestor of 586 * the class loader for the class whose class loader is requested, then 587 * this method calls the security manager's {@code checkPermission} 588 * method with a {@code RuntimePermission("getClassLoader")} 589 * permission to ensure it's ok to access the class loader for the class. 590 * 591 * <p>If this object 592 * represents a primitive type or void, null is returned. 593 * 594 * @return the class loader that loaded the class or interface 595 * represented by this object. 596 * @throws SecurityException 597 * if a security manager exists and its 598 * {@code checkPermission} method denies 599 * access to the class loader for the class. 600 * @see java.lang.ClassLoader 601 * @see SecurityManager#checkPermission 602 * @see java.lang.RuntimePermission 603 */ 604 public ClassLoader getClassLoader() { 605 ClassLoader cl = getClassLoader0(); 606 if (cl == null) 607 return null; 608 SecurityManager sm = System.getSecurityManager(); 609 if (sm != null) { 610 ClassLoader ccl = ClassLoader.getCallerClassLoader(); 611 if (ClassLoader.needsClassLoaderPermissionCheck(ccl, cl)) { 612 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); 613 } 614 } 615 return cl; 616 } 617 618 // Package-private to allow ClassLoader access 619 native ClassLoader getClassLoader0(); 620 621 622 /** 623 * Returns an array of {@code TypeVariable} objects that represent the 624 * type variables declared by the generic declaration represented by this 625 * {@code GenericDeclaration} object, in declaration order. Returns an 626 * array of length 0 if the underlying generic declaration declares no type 627 * variables. 628 * 629 * @return an array of {@code TypeVariable} objects that represent 630 * the type variables declared by this generic declaration 631 * @throws java.lang.reflect.GenericSignatureFormatError if the generic 632 * signature of this generic declaration does not conform to 633 * the format specified in 634 * <cite>The Java™ Virtual Machine Specification</cite> 635 * @since 1.5 636 */ 637 @SuppressWarnings("unchecked") 638 public TypeVariable<Class<T>>[] getTypeParameters() { 639 if (getGenericSignature() != null) 640 return (TypeVariable<Class<T>>[])getGenericInfo().getTypeParameters(); 641 else 642 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0]; 643 } 644 645 646 /** 647 * Returns the {@code Class} representing the superclass of the entity 648 * (class, interface, primitive type or void) represented by this 649 * {@code Class}. If this {@code Class} represents either the 650 * {@code Object} class, an interface, a primitive type, or void, then 651 * null is returned. If this object represents an array class then the 652 * {@code Class} object representing the {@code Object} class is 653 * returned. 654 * 655 * @return the superclass of the class represented by this object. 656 */ 657 public native Class<? super T> getSuperclass(); 658 659 660 /** 661 * Returns the {@code Type} representing the direct superclass of 662 * the entity (class, interface, primitive type or void) represented by 663 * this {@code Class}. 664 * 665 * <p>If the superclass is a parameterized type, the {@code Type} 666 * object returned must accurately reflect the actual type 667 * parameters used in the source code. The parameterized type 668 * representing the superclass is created if it had not been 669 * created before. See the declaration of {@link 670 * java.lang.reflect.ParameterizedType ParameterizedType} for the 671 * semantics of the creation process for parameterized types. If 672 * this {@code Class} represents either the {@code Object} 673 * class, an interface, a primitive type, or void, then null is 674 * returned. If this object represents an array class then the 675 * {@code Class} object representing the {@code Object} class is 676 * returned. 677 * 678 * @throws java.lang.reflect.GenericSignatureFormatError if the generic 679 * class signature does not conform to the format specified in 680 * <cite>The Java™ Virtual Machine Specification</cite> 681 * @throws TypeNotPresentException if the generic superclass 682 * refers to a non-existent type declaration 683 * @throws java.lang.reflect.MalformedParameterizedTypeException if the 684 * generic superclass refers to a parameterized type that cannot be 685 * instantiated for any reason 686 * @return the superclass of the class represented by this object 687 * @since 1.5 688 */ 689 public Type getGenericSuperclass() { 690 if (getGenericSignature() != null) { 691 // Historical irregularity: 692 // Generic signature marks interfaces with superclass = Object 693 // but this API returns null for interfaces 694 if (isInterface()) 695 return null; 696 return getGenericInfo().getSuperclass(); 697 } else 698 return getSuperclass(); 699 } 700 701 /** 702 * Gets the package for this class. The class loader of this class is used 703 * to find the package. If the class was loaded by the bootstrap class 704 * loader the set of packages loaded from CLASSPATH is searched to find the 705 * package of the class. Null is returned if no package object was created 706 * by the class loader of this class. 707 * 708 * <p> Packages have attributes for versions and specifications only if the 709 * information was defined in the manifests that accompany the classes, and 710 * if the class loader created the package instance with the attributes 711 * from the manifest. 712 * 713 * @return the package of the class, or null if no package 714 * information is available from the archive or codebase. 715 */ 716 public Package getPackage() { 717 return Package.getPackage(this); 718 } 719 720 721 /** 722 * Determines the interfaces implemented by the class or interface 723 * represented by this object. 724 * 725 * <p> If this object represents a class, the return value is an array 726 * containing objects representing all interfaces implemented by the 727 * class. The order of the interface objects in the array corresponds to 728 * the order of the interface names in the {@code implements} clause 729 * of the declaration of the class represented by this object. For 730 * example, given the declaration: 731 * <blockquote> 732 * {@code class Shimmer implements FloorWax, DessertTopping { ... }} 733 * </blockquote> 734 * suppose the value of {@code s} is an instance of 735 * {@code Shimmer}; the value of the expression: 736 * <blockquote> 737 * {@code s.getClass().getInterfaces()[0]} 738 * </blockquote> 739 * is the {@code Class} object that represents interface 740 * {@code FloorWax}; and the value of: 741 * <blockquote> 742 * {@code s.getClass().getInterfaces()[1]} 743 * </blockquote> 744 * is the {@code Class} object that represents interface 745 * {@code DessertTopping}. 746 * 747 * <p> If this object represents an interface, the array contains objects 748 * representing all interfaces extended by the interface. The order of the 749 * interface objects in the array corresponds to the order of the interface 750 * names in the {@code extends} clause of the declaration of the 751 * interface represented by this object. 752 * 753 * <p> If this object represents a class or interface that implements no 754 * interfaces, the method returns an array of length 0. 755 * 756 * <p> If this object represents a primitive type or void, the method 757 * returns an array of length 0. 758 * 759 * @return an array of interfaces implemented by this class. 760 */ 761 public native Class<?>[] getInterfaces(); 762 763 /** 764 * Returns the {@code Type}s representing the interfaces 765 * directly implemented by the class or interface represented by 766 * this object. 767 * 768 * <p>If a superinterface is a parameterized type, the 769 * {@code Type} object returned for it must accurately reflect 770 * the actual type parameters used in the source code. The 771 * parameterized type representing each superinterface is created 772 * if it had not been created before. See the declaration of 773 * {@link java.lang.reflect.ParameterizedType ParameterizedType} 774 * for the semantics of the creation process for parameterized 775 * types. 776 * 777 * <p> If this object represents a class, the return value is an 778 * array containing objects representing all interfaces 779 * implemented by the class. The order of the interface objects in 780 * the array corresponds to the order of the interface names in 781 * the {@code implements} clause of the declaration of the class 782 * represented by this object. In the case of an array class, the 783 * interfaces {@code Cloneable} and {@code Serializable} are 784 * returned in that order. 785 * 786 * <p>If this object represents an interface, the array contains 787 * objects representing all interfaces directly extended by the 788 * interface. The order of the interface objects in the array 789 * corresponds to the order of the interface names in the 790 * {@code extends} clause of the declaration of the interface 791 * represented by this object. 792 * 793 * <p>If this object represents a class or interface that 794 * implements no interfaces, the method returns an array of length 795 * 0. 796 * 797 * <p>If this object represents a primitive type or void, the 798 * method returns an array of length 0. 799 * 800 * @throws java.lang.reflect.GenericSignatureFormatError 801 * if the generic class signature does not conform to the format 802 * specified in 803 * <cite>The Java™ Virtual Machine Specification</cite> 804 * @throws TypeNotPresentException if any of the generic 805 * superinterfaces refers to a non-existent type declaration 806 * @throws java.lang.reflect.MalformedParameterizedTypeException 807 * if any of the generic superinterfaces refer to a parameterized 808 * type that cannot be instantiated for any reason 809 * @return an array of interfaces implemented by this class 810 * @since 1.5 811 */ 812 public Type[] getGenericInterfaces() { 813 if (getGenericSignature() != null) 814 return getGenericInfo().getSuperInterfaces(); 815 else 816 return getInterfaces(); 817 } 818 819 820 /** 821 * Returns the {@code Class} representing the component type of an 822 * array. If this class does not represent an array class this method 823 * returns null. 824 * 825 * @return the {@code Class} representing the component type of this 826 * class if this class is an array 827 * @see java.lang.reflect.Array 828 * @since JDK1.1 829 */ 830 public native Class<?> getComponentType(); 831 832 833 /** 834 * Returns the Java language modifiers for this class or interface, encoded 835 * in an integer. The modifiers consist of the Java Virtual Machine's 836 * constants for {@code public}, {@code protected}, 837 * {@code private}, {@code final}, {@code static}, 838 * {@code abstract} and {@code interface}; they should be decoded 839 * using the methods of class {@code Modifier}. 840 * 841 * <p> If the underlying class is an array class, then its 842 * {@code public}, {@code private} and {@code protected} 843 * modifiers are the same as those of its component type. If this 844 * {@code Class} represents a primitive type or void, its 845 * {@code public} modifier is always {@code true}, and its 846 * {@code protected} and {@code private} modifiers are always 847 * {@code false}. If this object represents an array class, a 848 * primitive type or void, then its {@code final} modifier is always 849 * {@code true} and its interface modifier is always 850 * {@code false}. The values of its other modifiers are not determined 851 * by this specification. 852 * 853 * <p> The modifier encodings are defined in <em>The Java Virtual Machine 854 * Specification</em>, table 4.1. 855 * 856 * @return the {@code int} representing the modifiers for this class 857 * @see java.lang.reflect.Modifier 858 * @since JDK1.1 859 */ 860 public native int getModifiers(); 861 862 863 /** 864 * Gets the signers of this class. 865 * 866 * @return the signers of this class, or null if there are no signers. In 867 * particular, this method returns null if this object represents 868 * a primitive type or void. 869 * @since JDK1.1 870 */ 871 public native Object[] getSigners(); 872 873 874 /** 875 * Set the signers of this class. 876 */ 877 native void setSigners(Object[] signers); 878 879 880 /** 881 * If this {@code Class} object represents a local or anonymous 882 * class within a method, returns a {@link 883 * java.lang.reflect.Method Method} object representing the 884 * immediately enclosing method of the underlying class. Returns 885 * {@code null} otherwise. 886 * 887 * In particular, this method returns {@code null} if the underlying 888 * class is a local or anonymous class immediately enclosed by a type 889 * declaration, instance initializer or static initializer. 890 * 891 * @return the immediately enclosing method of the underlying class, if 892 * that class is a local or anonymous class; otherwise {@code null}. 893 * @since 1.5 894 */ 895 public Method getEnclosingMethod() { 896 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 897 898 if (enclosingInfo == null) 899 return null; 900 else { 901 if (!enclosingInfo.isMethod()) 902 return null; 903 904 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(), 905 getFactory()); 906 Class<?> returnType = toClass(typeInfo.getReturnType()); 907 Type [] parameterTypes = typeInfo.getParameterTypes(); 908 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; 909 910 // Convert Types to Classes; returned types *should* 911 // be class objects since the methodDescriptor's used 912 // don't have generics information 913 for(int i = 0; i < parameterClasses.length; i++) 914 parameterClasses[i] = toClass(parameterTypes[i]); 915 916 /* 917 * Loop over all declared methods; match method name, 918 * number of and type of parameters, *and* return 919 * type. Matching return type is also necessary 920 * because of covariant returns, etc. 921 */ 922 for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) { 923 if (m.getName().equals(enclosingInfo.getName()) ) { 924 Class<?>[] candidateParamClasses = m.getParameterTypes(); 925 if (candidateParamClasses.length == parameterClasses.length) { 926 boolean matches = true; 927 for(int i = 0; i < candidateParamClasses.length; i++) { 928 if (!candidateParamClasses[i].equals(parameterClasses[i])) { 929 matches = false; 930 break; 931 } 932 } 933 934 if (matches) { // finally, check return type 935 if (m.getReturnType().equals(returnType) ) 936 return m; 937 } 938 } 939 } 940 } 941 942 throw new InternalError("Enclosing method not found"); 943 } 944 } 945 946 private native Object[] getEnclosingMethod0(); 947 948 private EnclosingMethodInfo getEnclosingMethodInfo() { 949 Object[] enclosingInfo = getEnclosingMethod0(); 950 if (enclosingInfo == null) 951 return null; 952 else { 953 return new EnclosingMethodInfo(enclosingInfo); 954 } 955 } 956 957 private final static class EnclosingMethodInfo { 958 private Class<?> enclosingClass; 959 private String name; 960 private String descriptor; 961 962 private EnclosingMethodInfo(Object[] enclosingInfo) { 963 if (enclosingInfo.length != 3) 964 throw new InternalError("Malformed enclosing method information"); 965 try { 966 // The array is expected to have three elements: 967 968 // the immediately enclosing class 969 enclosingClass = (Class<?>) enclosingInfo[0]; 970 assert(enclosingClass != null); 971 972 // the immediately enclosing method or constructor's 973 // name (can be null). 974 name = (String) enclosingInfo[1]; 975 976 // the immediately enclosing method or constructor's 977 // descriptor (null iff name is). 978 descriptor = (String) enclosingInfo[2]; 979 assert((name != null && descriptor != null) || name == descriptor); 980 } catch (ClassCastException cce) { 981 throw new InternalError("Invalid type in enclosing method information", cce); 982 } 983 } 984 985 boolean isPartial() { 986 return enclosingClass == null || name == null || descriptor == null; 987 } 988 989 boolean isConstructor() { return !isPartial() && "<init>".equals(name); } 990 991 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); } 992 993 Class<?> getEnclosingClass() { return enclosingClass; } 994 995 String getName() { return name; } 996 997 String getDescriptor() { return descriptor; } 998 999 } 1000 1001 private static Class<?> toClass(Type o) { 1002 if (o instanceof GenericArrayType) 1003 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()), 1004 0) 1005 .getClass(); 1006 return (Class<?>)o; 1007 } 1008 1009 /** 1010 * If this {@code Class} object represents a local or anonymous 1011 * class within a constructor, returns a {@link 1012 * java.lang.reflect.Constructor Constructor} object representing 1013 * the immediately enclosing constructor of the underlying 1014 * class. Returns {@code null} otherwise. In particular, this 1015 * method returns {@code null} if the underlying class is a local 1016 * or anonymous class immediately enclosed by a type declaration, 1017 * instance initializer or static initializer. 1018 * 1019 * @return the immediately enclosing constructor of the underlying class, if 1020 * that class is a local or anonymous class; otherwise {@code null}. 1021 * @since 1.5 1022 */ 1023 public Constructor<?> getEnclosingConstructor() { 1024 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1025 1026 if (enclosingInfo == null) 1027 return null; 1028 else { 1029 if (!enclosingInfo.isConstructor()) 1030 return null; 1031 1032 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(), 1033 getFactory()); 1034 Type [] parameterTypes = typeInfo.getParameterTypes(); 1035 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; 1036 1037 // Convert Types to Classes; returned types *should* 1038 // be class objects since the methodDescriptor's used 1039 // don't have generics information 1040 for(int i = 0; i < parameterClasses.length; i++) 1041 parameterClasses[i] = toClass(parameterTypes[i]); 1042 1043 /* 1044 * Loop over all declared constructors; match number 1045 * of and type of parameters. 1046 */ 1047 for(Constructor<?> c: enclosingInfo.getEnclosingClass().getDeclaredConstructors()) { 1048 Class<?>[] candidateParamClasses = c.getParameterTypes(); 1049 if (candidateParamClasses.length == parameterClasses.length) { 1050 boolean matches = true; 1051 for(int i = 0; i < candidateParamClasses.length; i++) { 1052 if (!candidateParamClasses[i].equals(parameterClasses[i])) { 1053 matches = false; 1054 break; 1055 } 1056 } 1057 1058 if (matches) 1059 return c; 1060 } 1061 } 1062 1063 throw new InternalError("Enclosing constructor not found"); 1064 } 1065 } 1066 1067 1068 /** 1069 * If the class or interface represented by this {@code Class} object 1070 * is a member of another class, returns the {@code Class} object 1071 * representing the class in which it was declared. This method returns 1072 * null if this class or interface is not a member of any other class. If 1073 * this {@code Class} object represents an array class, a primitive 1074 * type, or void,then this method returns null. 1075 * 1076 * @return the declaring class for this class 1077 * @since JDK1.1 1078 */ 1079 public native Class<?> getDeclaringClass(); 1080 1081 1082 /** 1083 * Returns the immediately enclosing class of the underlying 1084 * class. If the underlying class is a top level class this 1085 * method returns {@code null}. 1086 * @return the immediately enclosing class of the underlying class 1087 * @since 1.5 1088 */ 1089 public Class<?> getEnclosingClass() { 1090 // There are five kinds of classes (or interfaces): 1091 // a) Top level classes 1092 // b) Nested classes (static member classes) 1093 // c) Inner classes (non-static member classes) 1094 // d) Local classes (named classes declared within a method) 1095 // e) Anonymous classes 1096 1097 1098 // JVM Spec 4.8.6: A class must have an EnclosingMethod 1099 // attribute if and only if it is a local class or an 1100 // anonymous class. 1101 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1102 1103 if (enclosingInfo == null) { 1104 // This is a top level or a nested class or an inner class (a, b, or c) 1105 return getDeclaringClass(); 1106 } else { 1107 Class<?> enclosingClass = enclosingInfo.getEnclosingClass(); 1108 // This is a local class or an anonymous class (d or e) 1109 if (enclosingClass == this || enclosingClass == null) 1110 throw new InternalError("Malformed enclosing method information"); 1111 else 1112 return enclosingClass; 1113 } 1114 } 1115 1116 /** 1117 * Returns the simple name of the underlying class as given in the 1118 * source code. Returns an empty string if the underlying class is 1119 * anonymous. 1120 * 1121 * <p>The simple name of an array is the simple name of the 1122 * component type with "[]" appended. In particular the simple 1123 * name of an array whose component type is anonymous is "[]". 1124 * 1125 * @return the simple name of the underlying class 1126 * @since 1.5 1127 */ 1128 public String getSimpleName() { 1129 if (isArray()) 1130 return getComponentType().getSimpleName()+"[]"; 1131 1132 String simpleName = getSimpleBinaryName(); 1133 if (simpleName == null) { // top level class 1134 simpleName = getName(); 1135 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name 1136 } 1137 // According to JLS3 "Binary Compatibility" (13.1) the binary 1138 // name of non-package classes (not top level) is the binary 1139 // name of the immediately enclosing class followed by a '$' followed by: 1140 // (for nested and inner classes): the simple name. 1141 // (for local classes): 1 or more digits followed by the simple name. 1142 // (for anonymous classes): 1 or more digits. 1143 1144 // Since getSimpleBinaryName() will strip the binary name of 1145 // the immediatly enclosing class, we are now looking at a 1146 // string that matches the regular expression "\$[0-9]*" 1147 // followed by a simple name (considering the simple of an 1148 // anonymous class to be the empty string). 1149 1150 // Remove leading "\$[0-9]*" from the name 1151 int length = simpleName.length(); 1152 if (length < 1 || simpleName.charAt(0) != '$') 1153 throw new InternalError("Malformed class name"); 1154 int index = 1; 1155 while (index < length && isAsciiDigit(simpleName.charAt(index))) 1156 index++; 1157 // Eventually, this is the empty string iff this is an anonymous class 1158 return simpleName.substring(index); 1159 } 1160 1161 /** 1162 * Character.isDigit answers {@code true} to some non-ascii 1163 * digits. This one does not. 1164 */ 1165 private static boolean isAsciiDigit(char c) { 1166 return '0' <= c && c <= '9'; 1167 } 1168 1169 /** 1170 * Returns the canonical name of the underlying class as 1171 * defined by the Java Language Specification. Returns null if 1172 * the underlying class does not have a canonical name (i.e., if 1173 * it is a local or anonymous class or an array whose component 1174 * type does not have a canonical name). 1175 * @return the canonical name of the underlying class if it exists, and 1176 * {@code null} otherwise. 1177 * @since 1.5 1178 */ 1179 public String getCanonicalName() { 1180 if (isArray()) { 1181 String canonicalName = getComponentType().getCanonicalName(); 1182 if (canonicalName != null) 1183 return canonicalName + "[]"; 1184 else 1185 return null; 1186 } 1187 if (isLocalOrAnonymousClass()) 1188 return null; 1189 Class<?> enclosingClass = getEnclosingClass(); 1190 if (enclosingClass == null) { // top level class 1191 return getName(); 1192 } else { 1193 String enclosingName = enclosingClass.getCanonicalName(); 1194 if (enclosingName == null) 1195 return null; 1196 return enclosingName + "." + getSimpleName(); 1197 } 1198 } 1199 1200 /** 1201 * Returns {@code true} if and only if the underlying class 1202 * is an anonymous class. 1203 * 1204 * @return {@code true} if and only if this class is an anonymous class. 1205 * @since 1.5 1206 */ 1207 public boolean isAnonymousClass() { 1208 return "".equals(getSimpleName()); 1209 } 1210 1211 /** 1212 * Returns {@code true} if and only if the underlying class 1213 * is a local class. 1214 * 1215 * @return {@code true} if and only if this class is a local class. 1216 * @since 1.5 1217 */ 1218 public boolean isLocalClass() { 1219 return isLocalOrAnonymousClass() && !isAnonymousClass(); 1220 } 1221 1222 /** 1223 * Returns {@code true} if and only if the underlying class 1224 * is a member class. 1225 * 1226 * @return {@code true} if and only if this class is a member class. 1227 * @since 1.5 1228 */ 1229 public boolean isMemberClass() { 1230 return getSimpleBinaryName() != null && !isLocalOrAnonymousClass(); 1231 } 1232 1233 /** 1234 * Returns the "simple binary name" of the underlying class, i.e., 1235 * the binary name without the leading enclosing class name. 1236 * Returns {@code null} if the underlying class is a top level 1237 * class. 1238 */ 1239 private String getSimpleBinaryName() { 1240 Class<?> enclosingClass = getEnclosingClass(); 1241 if (enclosingClass == null) // top level class 1242 return null; 1243 // Otherwise, strip the enclosing class' name 1244 try { 1245 return getName().substring(enclosingClass.getName().length()); 1246 } catch (IndexOutOfBoundsException ex) { 1247 throw new InternalError("Malformed class name", ex); 1248 } 1249 } 1250 1251 /** 1252 * Returns {@code true} if this is a local class or an anonymous 1253 * class. Returns {@code false} otherwise. 1254 */ 1255 private boolean isLocalOrAnonymousClass() { 1256 // JVM Spec 4.8.6: A class must have an EnclosingMethod 1257 // attribute if and only if it is a local class or an 1258 // anonymous class. 1259 return getEnclosingMethodInfo() != null; 1260 } 1261 1262 /** 1263 * Returns an array containing {@code Class} objects representing all 1264 * the public classes and interfaces that are members of the class 1265 * represented by this {@code Class} object. This includes public 1266 * class and interface members inherited from superclasses and public class 1267 * and interface members declared by the class. This method returns an 1268 * array of length 0 if this {@code Class} object has no public member 1269 * classes or interfaces. This method also returns an array of length 0 if 1270 * this {@code Class} object represents a primitive type, an array 1271 * class, or void. 1272 * 1273 * @return the array of {@code Class} objects representing the public 1274 * members of this class 1275 * @exception SecurityException 1276 * If a security manager, <i>s</i>, is present and any of the 1277 * following conditions is met: 1278 * 1279 * <ul> 1280 * 1281 * <li> invocation of 1282 * {@link SecurityManager#checkMemberAccess 1283 * s.checkMemberAccess(this, Member.PUBLIC)} method 1284 * denies access to the classes within this class 1285 * 1286 * <li> the caller's class loader is not the same as or an 1287 * ancestor of the class loader for the current class and 1288 * invocation of {@link SecurityManager#checkPackageAccess 1289 * s.checkPackageAccess()} denies access to the package 1290 * of this class 1291 * 1292 * </ul> 1293 * 1294 * @since JDK1.1 1295 */ 1296 public Class<?>[] getClasses() { 1297 // be very careful not to change the stack depth of this 1298 // checkMemberAccess call for security reasons 1299 // see java.lang.SecurityManager.checkMemberAccess 1300 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 1301 1302 // Privileged so this implementation can look at DECLARED classes, 1303 // something the caller might not have privilege to do. The code here 1304 // is allowed to look at DECLARED classes because (1) it does not hand 1305 // out anything other than public members and (2) public member access 1306 // has already been ok'd by the SecurityManager. 1307 1308 return java.security.AccessController.doPrivileged( 1309 new java.security.PrivilegedAction<Class<?>[]>() { 1310 public Class<?>[] run() { 1311 List<Class<?>> list = new ArrayList<>(); 1312 Class<?> currentClass = Class.this; 1313 while (currentClass != null) { 1314 Class<?>[] members = currentClass.getDeclaredClasses(); 1315 for (int i = 0; i < members.length; i++) { 1316 if (Modifier.isPublic(members[i].getModifiers())) { 1317 list.add(members[i]); 1318 } 1319 } 1320 currentClass = currentClass.getSuperclass(); 1321 } 1322 return list.toArray(new Class<?>[0]); 1323 } 1324 }); 1325 } 1326 1327 1328 /** 1329 * Returns an array containing {@code Field} objects reflecting all 1330 * the accessible public fields of the class or interface represented by 1331 * this {@code Class} object. The elements in the array returned are 1332 * not sorted and are not in any particular order. This method returns an 1333 * array of length 0 if the class or interface has no accessible public 1334 * fields, or if it represents an array class, a primitive type, or void. 1335 * 1336 * <p> Specifically, if this {@code Class} object represents a class, 1337 * this method returns the public fields of this class and of all its 1338 * superclasses. If this {@code Class} object represents an 1339 * interface, this method returns the fields of this interface and of all 1340 * its superinterfaces. 1341 * 1342 * <p> The implicit length field for array class is not reflected by this 1343 * method. User code should use the methods of class {@code Array} to 1344 * manipulate arrays. 1345 * 1346 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. 1347 * 1348 * @return the array of {@code Field} objects representing the 1349 * public fields 1350 * @exception SecurityException 1351 * If a security manager, <i>s</i>, is present and any of the 1352 * following conditions is met: 1353 * 1354 * <ul> 1355 * 1356 * <li> invocation of 1357 * {@link SecurityManager#checkMemberAccess 1358 * s.checkMemberAccess(this, Member.PUBLIC)} denies 1359 * access to the fields within this class 1360 * 1361 * <li> the caller's class loader is not the same as or an 1362 * ancestor of the class loader for the current class and 1363 * invocation of {@link SecurityManager#checkPackageAccess 1364 * s.checkPackageAccess()} denies access to the package 1365 * of this class 1366 * 1367 * </ul> 1368 * 1369 * @since JDK1.1 1370 */ 1371 public Field[] getFields() throws SecurityException { 1372 // be very careful not to change the stack depth of this 1373 // checkMemberAccess call for security reasons 1374 // see java.lang.SecurityManager.checkMemberAccess 1375 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 1376 return copyFields(privateGetPublicFields(null)); 1377 } 1378 1379 1380 /** 1381 * Returns an array containing {@code Method} objects reflecting all 1382 * the public <em>member</em> methods of the class or interface represented 1383 * by this {@code Class} object, including those declared by the class 1384 * or interface and those inherited from superclasses and 1385 * superinterfaces. Array classes return all the (public) member methods 1386 * inherited from the {@code Object} class. The elements in the array 1387 * returned are not sorted and are not in any particular order. This 1388 * method returns an array of length 0 if this {@code Class} object 1389 * represents a class or interface that has no public member methods, or if 1390 * this {@code Class} object represents a primitive type or void. 1391 * 1392 * <p> The class initialization method {@code <clinit>} is not 1393 * included in the returned array. If the class declares multiple public 1394 * member methods with the same parameter types, they are all included in 1395 * the returned array. 1396 * 1397 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4. 1398 * 1399 * @return the array of {@code Method} objects representing the 1400 * public methods of this class 1401 * @exception SecurityException 1402 * If a security manager, <i>s</i>, is present and any of the 1403 * following conditions is met: 1404 * 1405 * <ul> 1406 * 1407 * <li> invocation of 1408 * {@link SecurityManager#checkMemberAccess 1409 * s.checkMemberAccess(this, Member.PUBLIC)} denies 1410 * access to the methods within this class 1411 * 1412 * <li> the caller's class loader is not the same as or an 1413 * ancestor of the class loader for the current class and 1414 * invocation of {@link SecurityManager#checkPackageAccess 1415 * s.checkPackageAccess()} denies access to the package 1416 * of this class 1417 * 1418 * </ul> 1419 * 1420 * @since JDK1.1 1421 */ 1422 public Method[] getMethods() throws SecurityException { 1423 // be very careful not to change the stack depth of this 1424 // checkMemberAccess call for security reasons 1425 // see java.lang.SecurityManager.checkMemberAccess 1426 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 1427 return copyMethods(privateGetPublicMethods()); 1428 } 1429 1430 1431 /** 1432 * Returns an array containing {@code Constructor} objects reflecting 1433 * all the public constructors of the class represented by this 1434 * {@code Class} object. An array of length 0 is returned if the 1435 * class has no public constructors, or if the class is an array class, or 1436 * if the class reflects a primitive type or void. 1437 * 1438 * Note that while this method returns an array of {@code 1439 * Constructor<T>} objects (that is an array of constructors from 1440 * this class), the return type of this method is {@code 1441 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as 1442 * might be expected. This less informative return type is 1443 * necessary since after being returned from this method, the 1444 * array could be modified to hold {@code Constructor} objects for 1445 * different classes, which would violate the type guarantees of 1446 * {@code Constructor<T>[]}. 1447 * 1448 * @return the array of {@code Constructor} objects representing the 1449 * public constructors of this class 1450 * @exception SecurityException 1451 * If a security manager, <i>s</i>, is present and any of the 1452 * following conditions is met: 1453 * 1454 * <ul> 1455 * 1456 * <li> invocation of 1457 * {@link SecurityManager#checkMemberAccess 1458 * s.checkMemberAccess(this, Member.PUBLIC)} denies 1459 * access to the constructors within this class 1460 * 1461 * <li> the caller's class loader is not the same as or an 1462 * ancestor of the class loader for the current class and 1463 * invocation of {@link SecurityManager#checkPackageAccess 1464 * s.checkPackageAccess()} denies access to the package 1465 * of this class 1466 * 1467 * </ul> 1468 * 1469 * @since JDK1.1 1470 */ 1471 public Constructor<?>[] getConstructors() throws SecurityException { 1472 // be very careful not to change the stack depth of this 1473 // checkMemberAccess call for security reasons 1474 // see java.lang.SecurityManager.checkMemberAccess 1475 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 1476 return copyConstructors(privateGetDeclaredConstructors(true)); 1477 } 1478 1479 1480 /** 1481 * Returns a {@code Field} object that reflects the specified public 1482 * member field of the class or interface represented by this 1483 * {@code Class} object. The {@code name} parameter is a 1484 * {@code String} specifying the simple name of the desired field. 1485 * 1486 * <p> The field to be reflected is determined by the algorithm that 1487 * follows. Let C be the class represented by this object: 1488 * <OL> 1489 * <LI> If C declares a public field with the name specified, that is the 1490 * field to be reflected.</LI> 1491 * <LI> If no field was found in step 1 above, this algorithm is applied 1492 * recursively to each direct superinterface of C. The direct 1493 * superinterfaces are searched in the order they were declared.</LI> 1494 * <LI> If no field was found in steps 1 and 2 above, and C has a 1495 * superclass S, then this algorithm is invoked recursively upon S. 1496 * If C has no superclass, then a {@code NoSuchFieldException} 1497 * is thrown.</LI> 1498 * </OL> 1499 * 1500 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. 1501 * 1502 * @param name the field name 1503 * @return the {@code Field} object of this class specified by 1504 * {@code name} 1505 * @exception NoSuchFieldException if a field with the specified name is 1506 * not found. 1507 * @exception NullPointerException if {@code name} is {@code null} 1508 * @exception SecurityException 1509 * If a security manager, <i>s</i>, is present and any of the 1510 * following conditions is met: 1511 * 1512 * <ul> 1513 * 1514 * <li> invocation of 1515 * {@link SecurityManager#checkMemberAccess 1516 * s.checkMemberAccess(this, Member.PUBLIC)} denies 1517 * access to the field 1518 * 1519 * <li> the caller's class loader is not the same as or an 1520 * ancestor of the class loader for the current class and 1521 * invocation of {@link SecurityManager#checkPackageAccess 1522 * s.checkPackageAccess()} denies access to the package 1523 * of this class 1524 * 1525 * </ul> 1526 * 1527 * @since JDK1.1 1528 */ 1529 public Field getField(String name) 1530 throws NoSuchFieldException, SecurityException { 1531 // be very careful not to change the stack depth of this 1532 // checkMemberAccess call for security reasons 1533 // see java.lang.SecurityManager.checkMemberAccess 1534 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 1535 Field field = getField0(name); 1536 if (field == null) { 1537 throw new NoSuchFieldException(name); 1538 } 1539 return field; 1540 } 1541 1542 1543 /** 1544 * Returns a {@code Method} object that reflects the specified public 1545 * member method of the class or interface represented by this 1546 * {@code Class} object. The {@code name} parameter is a 1547 * {@code String} specifying the simple name of the desired method. The 1548 * {@code parameterTypes} parameter is an array of {@code Class} 1549 * objects that identify the method's formal parameter types, in declared 1550 * order. If {@code parameterTypes} is {@code null}, it is 1551 * treated as if it were an empty array. 1552 * 1553 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a 1554 * {@code NoSuchMethodException} is raised. Otherwise, the method to 1555 * be reflected is determined by the algorithm that follows. Let C be the 1556 * class represented by this object: 1557 * <OL> 1558 * <LI> C is searched for any <I>matching methods</I>. If no matching 1559 * method is found, the algorithm of step 1 is invoked recursively on 1560 * the superclass of C.</LI> 1561 * <LI> If no method was found in step 1 above, the superinterfaces of C 1562 * are searched for a matching method. If any such method is found, it 1563 * is reflected.</LI> 1564 * </OL> 1565 * 1566 * To find a matching method in a class C: If C declares exactly one 1567 * public method with the specified name and exactly the same formal 1568 * parameter types, that is the method reflected. If more than one such 1569 * method is found in C, and one of these methods has a return type that is 1570 * more specific than any of the others, that method is reflected; 1571 * otherwise one of the methods is chosen arbitrarily. 1572 * 1573 * <p>Note that there may be more than one matching method in a 1574 * class because while the Java language forbids a class to 1575 * declare multiple methods with the same signature but different 1576 * return types, the Java virtual machine does not. This 1577 * increased flexibility in the virtual machine can be used to 1578 * implement various language features. For example, covariant 1579 * returns can be implemented with {@linkplain 1580 * java.lang.reflect.Method#isBridge bridge methods}; the bridge 1581 * method and the method being overridden would have the same 1582 * signature but different return types. 1583 * 1584 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4. 1585 * 1586 * @param name the name of the method 1587 * @param parameterTypes the list of parameters 1588 * @return the {@code Method} object that matches the specified 1589 * {@code name} and {@code parameterTypes} 1590 * @exception NoSuchMethodException if a matching method is not found 1591 * or if the name is "<init>"or "<clinit>". 1592 * @exception NullPointerException if {@code name} is {@code null} 1593 * @exception SecurityException 1594 * If a security manager, <i>s</i>, is present and any of the 1595 * following conditions is met: 1596 * 1597 * <ul> 1598 * 1599 * <li> invocation of 1600 * {@link SecurityManager#checkMemberAccess 1601 * s.checkMemberAccess(this, Member.PUBLIC)} denies 1602 * access to the method 1603 * 1604 * <li> the caller's class loader is not the same as or an 1605 * ancestor of the class loader for the current class and 1606 * invocation of {@link SecurityManager#checkPackageAccess 1607 * s.checkPackageAccess()} denies access to the package 1608 * of this class 1609 * 1610 * </ul> 1611 * 1612 * @since JDK1.1 1613 */ 1614 public Method getMethod(String name, Class<?>... parameterTypes) 1615 throws NoSuchMethodException, SecurityException { 1616 // be very careful not to change the stack depth of this 1617 // checkMemberAccess call for security reasons 1618 // see java.lang.SecurityManager.checkMemberAccess 1619 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 1620 Method method = getMethod0(name, parameterTypes); 1621 if (method == null) { 1622 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); 1623 } 1624 return method; 1625 } 1626 1627 1628 /** 1629 * Returns a {@code Constructor} object that reflects the specified 1630 * public constructor of the class represented by this {@code Class} 1631 * object. The {@code parameterTypes} parameter is an array of 1632 * {@code Class} objects that identify the constructor's formal 1633 * parameter types, in declared order. 1634 * 1635 * If this {@code Class} object represents an inner class 1636 * declared in a non-static context, the formal parameter types 1637 * include the explicit enclosing instance as the first parameter. 1638 * 1639 * <p> The constructor to reflect is the public constructor of the class 1640 * represented by this {@code Class} object whose formal parameter 1641 * types match those specified by {@code parameterTypes}. 1642 * 1643 * @param parameterTypes the parameter array 1644 * @return the {@code Constructor} object of the public constructor that 1645 * matches the specified {@code parameterTypes} 1646 * @exception NoSuchMethodException if a matching method is not found. 1647 * @exception SecurityException 1648 * If a security manager, <i>s</i>, is present and any of the 1649 * following conditions is met: 1650 * 1651 * <ul> 1652 * 1653 * <li> invocation of 1654 * {@link SecurityManager#checkMemberAccess 1655 * s.checkMemberAccess(this, Member.PUBLIC)} denies 1656 * access to the constructor 1657 * 1658 * <li> the caller's class loader is not the same as or an 1659 * ancestor of the class loader for the current class and 1660 * invocation of {@link SecurityManager#checkPackageAccess 1661 * s.checkPackageAccess()} denies access to the package 1662 * of this class 1663 * 1664 * </ul> 1665 * 1666 * @since JDK1.1 1667 */ 1668 public Constructor<T> getConstructor(Class<?>... parameterTypes) 1669 throws NoSuchMethodException, SecurityException { 1670 // be very careful not to change the stack depth of this 1671 // checkMemberAccess call for security reasons 1672 // see java.lang.SecurityManager.checkMemberAccess 1673 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); 1674 return getConstructor0(parameterTypes, Member.PUBLIC); 1675 } 1676 1677 1678 /** 1679 * Returns an array of {@code Class} objects reflecting all the 1680 * classes and interfaces declared as members of the class represented by 1681 * this {@code Class} object. This includes public, protected, default 1682 * (package) access, and private classes and interfaces declared by the 1683 * class, but excludes inherited classes and interfaces. This method 1684 * returns an array of length 0 if the class declares no classes or 1685 * interfaces as members, or if this {@code Class} object represents a 1686 * primitive type, an array class, or void. 1687 * 1688 * @return the array of {@code Class} objects representing all the 1689 * declared members of this class 1690 * @exception SecurityException 1691 * If a security manager, <i>s</i>, is present and any of the 1692 * following conditions is met: 1693 * 1694 * <ul> 1695 * 1696 * <li> invocation of 1697 * {@link SecurityManager#checkMemberAccess 1698 * s.checkMemberAccess(this, Member.DECLARED)} denies 1699 * access to the declared classes within this class 1700 * 1701 * <li> the caller's class loader is not the same as or an 1702 * ancestor of the class loader for the current class and 1703 * invocation of {@link SecurityManager#checkPackageAccess 1704 * s.checkPackageAccess()} denies access to the package 1705 * of this class 1706 * 1707 * </ul> 1708 * 1709 * @since JDK1.1 1710 */ 1711 public Class<?>[] getDeclaredClasses() throws SecurityException { 1712 // be very careful not to change the stack depth of this 1713 // checkMemberAccess call for security reasons 1714 // see java.lang.SecurityManager.checkMemberAccess 1715 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); 1716 return getDeclaredClasses0(); 1717 } 1718 1719 1720 /** 1721 * Returns an array of {@code Field} objects reflecting all the fields 1722 * declared by the class or interface represented by this 1723 * {@code Class} object. This includes public, protected, default 1724 * (package) access, and private fields, but excludes inherited fields. 1725 * The elements in the array returned are not sorted and are not in any 1726 * particular order. This method returns an array of length 0 if the class 1727 * or interface declares no fields, or if this {@code Class} object 1728 * represents a primitive type, an array class, or void. 1729 * 1730 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. 1731 * 1732 * @return the array of {@code Field} objects representing all the 1733 * declared fields of this class 1734 * @exception SecurityException 1735 * If a security manager, <i>s</i>, is present and any of the 1736 * following conditions is met: 1737 * 1738 * <ul> 1739 * 1740 * <li> invocation of 1741 * {@link SecurityManager#checkMemberAccess 1742 * s.checkMemberAccess(this, Member.DECLARED)} denies 1743 * access to the declared fields within this class 1744 * 1745 * <li> the caller's class loader is not the same as or an 1746 * ancestor of the class loader for the current class and 1747 * invocation of {@link SecurityManager#checkPackageAccess 1748 * s.checkPackageAccess()} denies access to the package 1749 * of this class 1750 * 1751 * </ul> 1752 * 1753 * @since JDK1.1 1754 */ 1755 public Field[] getDeclaredFields() throws SecurityException { 1756 // be very careful not to change the stack depth of this 1757 // checkMemberAccess call for security reasons 1758 // see java.lang.SecurityManager.checkMemberAccess 1759 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); 1760 return copyFields(privateGetDeclaredFields(false)); 1761 } 1762 1763 1764 /** 1765 * Returns an array of {@code Method} objects reflecting all the 1766 * methods declared by the class or interface represented by this 1767 * {@code Class} object. This includes public, protected, default 1768 * (package) access, and private methods, but excludes inherited methods. 1769 * The elements in the array returned are not sorted and are not in any 1770 * particular order. This method returns an array of length 0 if the class 1771 * or interface declares no methods, or if this {@code Class} object 1772 * represents a primitive type, an array class, or void. The class 1773 * initialization method {@code <clinit>} is not included in the 1774 * returned array. If the class declares multiple public member methods 1775 * with the same parameter types, they are all included in the returned 1776 * array. 1777 * 1778 * <p> See <em>The Java Language Specification</em>, section 8.2. 1779 * 1780 * @return the array of {@code Method} objects representing all the 1781 * declared methods of this class 1782 * @exception SecurityException 1783 * If a security manager, <i>s</i>, is present and any of the 1784 * following conditions is met: 1785 * 1786 * <ul> 1787 * 1788 * <li> invocation of 1789 * {@link SecurityManager#checkMemberAccess 1790 * s.checkMemberAccess(this, Member.DECLARED)} denies 1791 * access to the declared methods within this class 1792 * 1793 * <li> the caller's class loader is not the same as or an 1794 * ancestor of the class loader for the current class and 1795 * invocation of {@link SecurityManager#checkPackageAccess 1796 * s.checkPackageAccess()} denies access to the package 1797 * of this class 1798 * 1799 * </ul> 1800 * 1801 * @since JDK1.1 1802 */ 1803 public Method[] getDeclaredMethods() throws SecurityException { 1804 // be very careful not to change the stack depth of this 1805 // checkMemberAccess call for security reasons 1806 // see java.lang.SecurityManager.checkMemberAccess 1807 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); 1808 return copyMethods(privateGetDeclaredMethods(false)); 1809 } 1810 1811 1812 /** 1813 * Returns an array of {@code Constructor} objects reflecting all the 1814 * constructors declared by the class represented by this 1815 * {@code Class} object. These are public, protected, default 1816 * (package) access, and private constructors. The elements in the array 1817 * returned are not sorted and are not in any particular order. If the 1818 * class has a default constructor, it is included in the returned array. 1819 * This method returns an array of length 0 if this {@code Class} 1820 * object represents an interface, a primitive type, an array class, or 1821 * void. 1822 * 1823 * <p> See <em>The Java Language Specification</em>, section 8.2. 1824 * 1825 * @return the array of {@code Constructor} objects representing all the 1826 * declared constructors of this class 1827 * @exception SecurityException 1828 * If a security manager, <i>s</i>, is present and any of the 1829 * following conditions is met: 1830 * 1831 * <ul> 1832 * 1833 * <li> invocation of 1834 * {@link SecurityManager#checkMemberAccess 1835 * s.checkMemberAccess(this, Member.DECLARED)} denies 1836 * access to the declared constructors within this class 1837 * 1838 * <li> the caller's class loader is not the same as or an 1839 * ancestor of the class loader for the current class and 1840 * invocation of {@link SecurityManager#checkPackageAccess 1841 * s.checkPackageAccess()} denies access to the package 1842 * of this class 1843 * 1844 * </ul> 1845 * 1846 * @since JDK1.1 1847 */ 1848 public Constructor<?>[] getDeclaredConstructors() throws SecurityException { 1849 // be very careful not to change the stack depth of this 1850 // checkMemberAccess call for security reasons 1851 // see java.lang.SecurityManager.checkMemberAccess 1852 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); 1853 return copyConstructors(privateGetDeclaredConstructors(false)); 1854 } 1855 1856 1857 /** 1858 * Returns a {@code Field} object that reflects the specified declared 1859 * field of the class or interface represented by this {@code Class} 1860 * object. The {@code name} parameter is a {@code String} that 1861 * specifies the simple name of the desired field. Note that this method 1862 * will not reflect the {@code length} field of an array class. 1863 * 1864 * @param name the name of the field 1865 * @return the {@code Field} object for the specified field in this 1866 * class 1867 * @exception NoSuchFieldException if a field with the specified name is 1868 * not found. 1869 * @exception NullPointerException if {@code name} is {@code null} 1870 * @exception SecurityException 1871 * If a security manager, <i>s</i>, is present and any of the 1872 * following conditions is met: 1873 * 1874 * <ul> 1875 * 1876 * <li> invocation of 1877 * {@link SecurityManager#checkMemberAccess 1878 * s.checkMemberAccess(this, Member.DECLARED)} denies 1879 * access to the declared field 1880 * 1881 * <li> the caller's class loader is not the same as or an 1882 * ancestor of the class loader for the current class and 1883 * invocation of {@link SecurityManager#checkPackageAccess 1884 * s.checkPackageAccess()} denies access to the package 1885 * of this class 1886 * 1887 * </ul> 1888 * 1889 * @since JDK1.1 1890 */ 1891 public Field getDeclaredField(String name) 1892 throws NoSuchFieldException, SecurityException { 1893 // be very careful not to change the stack depth of this 1894 // checkMemberAccess call for security reasons 1895 // see java.lang.SecurityManager.checkMemberAccess 1896 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); 1897 Field field = searchFields(privateGetDeclaredFields(false), name); 1898 if (field == null) { 1899 throw new NoSuchFieldException(name); 1900 } 1901 return field; 1902 } 1903 1904 1905 /** 1906 * Returns a {@code Method} object that reflects the specified 1907 * declared method of the class or interface represented by this 1908 * {@code Class} object. The {@code name} parameter is a 1909 * {@code String} that specifies the simple name of the desired 1910 * method, and the {@code parameterTypes} parameter is an array of 1911 * {@code Class} objects that identify the method's formal parameter 1912 * types, in declared order. If more than one method with the same 1913 * parameter types is declared in a class, and one of these methods has a 1914 * return type that is more specific than any of the others, that method is 1915 * returned; otherwise one of the methods is chosen arbitrarily. If the 1916 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException} 1917 * is raised. 1918 * 1919 * @param name the name of the method 1920 * @param parameterTypes the parameter array 1921 * @return the {@code Method} object for the method of this class 1922 * matching the specified name and parameters 1923 * @exception NoSuchMethodException if a matching method is not found. 1924 * @exception NullPointerException if {@code name} is {@code null} 1925 * @exception SecurityException 1926 * If a security manager, <i>s</i>, is present and any of the 1927 * following conditions is met: 1928 * 1929 * <ul> 1930 * 1931 * <li> invocation of 1932 * {@link SecurityManager#checkMemberAccess 1933 * s.checkMemberAccess(this, Member.DECLARED)} denies 1934 * access to the declared method 1935 * 1936 * <li> the caller's class loader is not the same as or an 1937 * ancestor of the class loader for the current class and 1938 * invocation of {@link SecurityManager#checkPackageAccess 1939 * s.checkPackageAccess()} denies access to the package 1940 * of this class 1941 * 1942 * </ul> 1943 * 1944 * @since JDK1.1 1945 */ 1946 public Method getDeclaredMethod(String name, Class<?>... parameterTypes) 1947 throws NoSuchMethodException, SecurityException { 1948 // be very careful not to change the stack depth of this 1949 // checkMemberAccess call for security reasons 1950 // see java.lang.SecurityManager.checkMemberAccess 1951 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); 1952 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); 1953 if (method == null) { 1954 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); 1955 } 1956 return method; 1957 } 1958 1959 1960 /** 1961 * Returns a {@code Constructor} object that reflects the specified 1962 * constructor of the class or interface represented by this 1963 * {@code Class} object. The {@code parameterTypes} parameter is 1964 * an array of {@code Class} objects that identify the constructor's 1965 * formal parameter types, in declared order. 1966 * 1967 * If this {@code Class} object represents an inner class 1968 * declared in a non-static context, the formal parameter types 1969 * include the explicit enclosing instance as the first parameter. 1970 * 1971 * @param parameterTypes the parameter array 1972 * @return The {@code Constructor} object for the constructor with the 1973 * specified parameter list 1974 * @exception NoSuchMethodException if a matching method is not found. 1975 * @exception SecurityException 1976 * If a security manager, <i>s</i>, is present and any of the 1977 * following conditions is met: 1978 * 1979 * <ul> 1980 * 1981 * <li> invocation of 1982 * {@link SecurityManager#checkMemberAccess 1983 * s.checkMemberAccess(this, Member.DECLARED)} denies 1984 * access to the declared constructor 1985 * 1986 * <li> the caller's class loader is not the same as or an 1987 * ancestor of the class loader for the current class and 1988 * invocation of {@link SecurityManager#checkPackageAccess 1989 * s.checkPackageAccess()} denies access to the package 1990 * of this class 1991 * 1992 * </ul> 1993 * 1994 * @since JDK1.1 1995 */ 1996 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) 1997 throws NoSuchMethodException, SecurityException { 1998 // be very careful not to change the stack depth of this 1999 // checkMemberAccess call for security reasons 2000 // see java.lang.SecurityManager.checkMemberAccess 2001 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); 2002 return getConstructor0(parameterTypes, Member.DECLARED); 2003 } 2004 2005 /** 2006 * Finds a resource with a given name. The rules for searching resources 2007 * associated with a given class are implemented by the defining 2008 * {@linkplain ClassLoader class loader} of the class. This method 2009 * delegates to this object's class loader. If this object was loaded by 2010 * the bootstrap class loader, the method delegates to {@link 2011 * ClassLoader#getSystemResourceAsStream}. 2012 * 2013 * <p> Before delegation, an absolute resource name is constructed from the 2014 * given resource name using this algorithm: 2015 * 2016 * <ul> 2017 * 2018 * <li> If the {@code name} begins with a {@code '/'} 2019 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the 2020 * portion of the {@code name} following the {@code '/'}. 2021 * 2022 * <li> Otherwise, the absolute name is of the following form: 2023 * 2024 * <blockquote> 2025 * {@code modified_package_name/name} 2026 * </blockquote> 2027 * 2028 * <p> Where the {@code modified_package_name} is the package name of this 2029 * object with {@code '/'} substituted for {@code '.'} 2030 * (<tt>'\u002e'</tt>). 2031 * 2032 * </ul> 2033 * 2034 * @param name name of the desired resource 2035 * @return A {@link java.io.InputStream} object or {@code null} if 2036 * no resource with this name is found 2037 * @throws NullPointerException If {@code name} is {@code null} 2038 * @since JDK1.1 2039 */ 2040 public InputStream getResourceAsStream(String name) { 2041 name = resolveName(name); 2042 ClassLoader cl = getClassLoader0(); 2043 if (cl==null) { 2044 // A system class. 2045 return ClassLoader.getSystemResourceAsStream(name); 2046 } 2047 return cl.getResourceAsStream(name); 2048 } 2049 2050 /** 2051 * Finds a resource with a given name. The rules for searching resources 2052 * associated with a given class are implemented by the defining 2053 * {@linkplain ClassLoader class loader} of the class. This method 2054 * delegates to this object's class loader. If this object was loaded by 2055 * the bootstrap class loader, the method delegates to {@link 2056 * ClassLoader#getSystemResource}. 2057 * 2058 * <p> Before delegation, an absolute resource name is constructed from the 2059 * given resource name using this algorithm: 2060 * 2061 * <ul> 2062 * 2063 * <li> If the {@code name} begins with a {@code '/'} 2064 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the 2065 * portion of the {@code name} following the {@code '/'}. 2066 * 2067 * <li> Otherwise, the absolute name is of the following form: 2068 * 2069 * <blockquote> 2070 * {@code modified_package_name/name} 2071 * </blockquote> 2072 * 2073 * <p> Where the {@code modified_package_name} is the package name of this 2074 * object with {@code '/'} substituted for {@code '.'} 2075 * (<tt>'\u002e'</tt>). 2076 * 2077 * </ul> 2078 * 2079 * @param name name of the desired resource 2080 * @return A {@link java.net.URL} object or {@code null} if no 2081 * resource with this name is found 2082 * @since JDK1.1 2083 */ 2084 public java.net.URL getResource(String name) { 2085 name = resolveName(name); 2086 ClassLoader cl = getClassLoader0(); 2087 if (cl==null) { 2088 // A system class. 2089 return ClassLoader.getSystemResource(name); 2090 } 2091 return cl.getResource(name); 2092 } 2093 2094 2095 2096 /** protection domain returned when the internal domain is null */ 2097 private static java.security.ProtectionDomain allPermDomain; 2098 2099 2100 /** 2101 * Returns the {@code ProtectionDomain} of this class. If there is a 2102 * security manager installed, this method first calls the security 2103 * manager's {@code checkPermission} method with a 2104 * {@code RuntimePermission("getProtectionDomain")} permission to 2105 * ensure it's ok to get the 2106 * {@code ProtectionDomain}. 2107 * 2108 * @return the ProtectionDomain of this class 2109 * 2110 * @throws SecurityException 2111 * if a security manager exists and its 2112 * {@code checkPermission} method doesn't allow 2113 * getting the ProtectionDomain. 2114 * 2115 * @see java.security.ProtectionDomain 2116 * @see SecurityManager#checkPermission 2117 * @see java.lang.RuntimePermission 2118 * @since 1.2 2119 */ 2120 public java.security.ProtectionDomain getProtectionDomain() { 2121 SecurityManager sm = System.getSecurityManager(); 2122 if (sm != null) { 2123 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION); 2124 } 2125 java.security.ProtectionDomain pd = getProtectionDomain0(); 2126 if (pd == null) { 2127 if (allPermDomain == null) { 2128 java.security.Permissions perms = 2129 new java.security.Permissions(); 2130 perms.add(SecurityConstants.ALL_PERMISSION); 2131 allPermDomain = 2132 new java.security.ProtectionDomain(null, perms); 2133 } 2134 pd = allPermDomain; 2135 } 2136 return pd; 2137 } 2138 2139 2140 /** 2141 * Returns the ProtectionDomain of this class. 2142 */ 2143 private native java.security.ProtectionDomain getProtectionDomain0(); 2144 2145 2146 /** 2147 * Set the ProtectionDomain for this class. Called by 2148 * ClassLoader.defineClass. 2149 */ 2150 native void setProtectionDomain0(java.security.ProtectionDomain pd); 2151 2152 2153 /* 2154 * Return the Virtual Machine's Class object for the named 2155 * primitive type. 2156 */ 2157 static native Class<?> getPrimitiveClass(String name); 2158 2159 2160 /* 2161 * Check if client is allowed to access members. If access is denied, 2162 * throw a SecurityException. 2163 * 2164 * Be very careful not to change the stack depth of this checkMemberAccess 2165 * call for security reasons. 2166 * See java.lang.SecurityManager.checkMemberAccess. 2167 * 2168 * <p> Default policy: allow all clients access with normal Java access 2169 * control. 2170 */ 2171 private void checkMemberAccess(int which, ClassLoader ccl) { 2172 SecurityManager s = System.getSecurityManager(); 2173 if (s != null) { 2174 s.checkMemberAccess(this, which); 2175 ClassLoader cl = getClassLoader0(); 2176 if (sun.reflect.misc.ReflectUtil.needsPackageAccessCheck(ccl, cl)) { 2177 String name = this.getName(); 2178 int i = name.lastIndexOf('.'); 2179 if (i != -1) { 2180 s.checkPackageAccess(name.substring(0, i)); 2181 } 2182 } 2183 } 2184 } 2185 2186 /** 2187 * Add a package name prefix if the name is not absolute Remove leading "/" 2188 * if name is absolute 2189 */ 2190 private String resolveName(String name) { 2191 if (name == null) { 2192 return name; 2193 } 2194 if (!name.startsWith("/")) { 2195 Class<?> c = this; 2196 while (c.isArray()) { 2197 c = c.getComponentType(); 2198 } 2199 String baseName = c.getName(); 2200 int index = baseName.lastIndexOf('.'); 2201 if (index != -1) { 2202 name = baseName.substring(0, index).replace('.', '/') 2203 +"/"+name; 2204 } 2205 } else { 2206 name = name.substring(1); 2207 } 2208 return name; 2209 } 2210 2211 /** 2212 * Reflection support. 2213 */ 2214 2215 // Caches for certain reflective results 2216 private static boolean useCaches = true; 2217 private volatile transient SoftReference<Field[]> declaredFields; 2218 private volatile transient SoftReference<Field[]> publicFields; 2219 private volatile transient SoftReference<Method[]> declaredMethods; 2220 private volatile transient SoftReference<Method[]> publicMethods; 2221 private volatile transient SoftReference<Constructor<T>[]> declaredConstructors; 2222 private volatile transient SoftReference<Constructor<T>[]> publicConstructors; 2223 // Intermediate results for getFields and getMethods 2224 private volatile transient SoftReference<Field[]> declaredPublicFields; 2225 private volatile transient SoftReference<Method[]> declaredPublicMethods; 2226 2227 // Incremented by the VM on each call to JVM TI RedefineClasses() 2228 // that redefines this class or a superclass. 2229 private volatile transient int classRedefinedCount = 0; 2230 2231 // Value of classRedefinedCount when we last cleared the cached values 2232 // that are sensitive to class redefinition. 2233 private volatile transient int lastRedefinedCount = 0; 2234 2235 // Clears cached values that might possibly have been obsoleted by 2236 // a class redefinition. 2237 private void clearCachesOnClassRedefinition() { 2238 if (lastRedefinedCount != classRedefinedCount) { 2239 declaredFields = publicFields = declaredPublicFields = null; 2240 declaredMethods = publicMethods = declaredPublicMethods = null; 2241 declaredConstructors = publicConstructors = null; 2242 annotations = declaredAnnotations = null; 2243 2244 // Use of "volatile" (and synchronization by caller in the case 2245 // of annotations) ensures that no thread sees the update to 2246 // lastRedefinedCount before seeing the caches cleared. 2247 // We do not guard against brief windows during which multiple 2248 // threads might redundantly work to fill an empty cache. 2249 lastRedefinedCount = classRedefinedCount; 2250 } 2251 } 2252 2253 // Generic signature handling 2254 private native String getGenericSignature(); 2255 2256 // Generic info repository; lazily initialized 2257 private transient ClassRepository genericInfo; 2258 2259 // accessor for factory 2260 private GenericsFactory getFactory() { 2261 // create scope and factory 2262 return CoreReflectionFactory.make(this, ClassScope.make(this)); 2263 } 2264 2265 // accessor for generic info repository 2266 private ClassRepository getGenericInfo() { 2267 // lazily initialize repository if necessary 2268 if (genericInfo == null) { 2269 // create and cache generic info repository 2270 genericInfo = ClassRepository.make(getGenericSignature(), 2271 getFactory()); 2272 } 2273 return genericInfo; //return cached repository 2274 } 2275 2276 // Annotations handling 2277 private native byte[] getRawAnnotations(); 2278 2279 native ConstantPool getConstantPool(); 2280 2281 // 2282 // 2283 // java.lang.reflect.Field handling 2284 // 2285 // 2286 2287 // Returns an array of "root" fields. These Field objects must NOT 2288 // be propagated to the outside world, but must instead be copied 2289 // via ReflectionFactory.copyField. 2290 private Field[] privateGetDeclaredFields(boolean publicOnly) { 2291 checkInitted(); 2292 Field[] res = null; 2293 if (useCaches) { 2294 clearCachesOnClassRedefinition(); 2295 if (publicOnly) { 2296 if (declaredPublicFields != null) { 2297 res = declaredPublicFields.get(); 2298 } 2299 } else { 2300 if (declaredFields != null) { 2301 res = declaredFields.get(); 2302 } 2303 } 2304 if (res != null) return res; 2305 } 2306 // No cached value available; request value from VM 2307 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly)); 2308 if (useCaches) { 2309 if (publicOnly) { 2310 declaredPublicFields = new SoftReference<>(res); 2311 } else { 2312 declaredFields = new SoftReference<>(res); 2313 } 2314 } 2315 return res; 2316 } 2317 2318 // Returns an array of "root" fields. These Field objects must NOT 2319 // be propagated to the outside world, but must instead be copied 2320 // via ReflectionFactory.copyField. 2321 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) { 2322 checkInitted(); 2323 Field[] res = null; 2324 if (useCaches) { 2325 clearCachesOnClassRedefinition(); 2326 if (publicFields != null) { 2327 res = publicFields.get(); 2328 } 2329 if (res != null) return res; 2330 } 2331 2332 // No cached value available; compute value recursively. 2333 // Traverse in correct order for getField(). 2334 List<Field> fields = new ArrayList<>(); 2335 if (traversedInterfaces == null) { 2336 traversedInterfaces = new HashSet<>(); 2337 } 2338 2339 // Local fields 2340 Field[] tmp = privateGetDeclaredFields(true); 2341 addAll(fields, tmp); 2342 2343 // Direct superinterfaces, recursively 2344 for (Class<?> c : getInterfaces()) { 2345 if (!traversedInterfaces.contains(c)) { 2346 traversedInterfaces.add(c); 2347 addAll(fields, c.privateGetPublicFields(traversedInterfaces)); 2348 } 2349 } 2350 2351 // Direct superclass, recursively 2352 if (!isInterface()) { 2353 Class<?> c = getSuperclass(); 2354 if (c != null) { 2355 addAll(fields, c.privateGetPublicFields(traversedInterfaces)); 2356 } 2357 } 2358 2359 res = new Field[fields.size()]; 2360 fields.toArray(res); 2361 if (useCaches) { 2362 publicFields = new SoftReference<>(res); 2363 } 2364 return res; 2365 } 2366 2367 private static void addAll(Collection<Field> c, Field[] o) { 2368 for (int i = 0; i < o.length; i++) { 2369 c.add(o[i]); 2370 } 2371 } 2372 2373 2374 // 2375 // 2376 // java.lang.reflect.Constructor handling 2377 // 2378 // 2379 2380 // Returns an array of "root" constructors. These Constructor 2381 // objects must NOT be propagated to the outside world, but must 2382 // instead be copied via ReflectionFactory.copyConstructor. 2383 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) { 2384 checkInitted(); 2385 Constructor<T>[] res = null; 2386 if (useCaches) { 2387 clearCachesOnClassRedefinition(); 2388 if (publicOnly) { 2389 if (publicConstructors != null) { 2390 res = publicConstructors.get(); 2391 } 2392 } else { 2393 if (declaredConstructors != null) { 2394 res = declaredConstructors.get(); 2395 } 2396 } 2397 if (res != null) return res; 2398 } 2399 // No cached value available; request value from VM 2400 if (isInterface()) { 2401 @SuppressWarnings("unchecked") 2402 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0]; 2403 res = temporaryRes; 2404 } else { 2405 res = getDeclaredConstructors0(publicOnly); 2406 } 2407 if (useCaches) { 2408 if (publicOnly) { 2409 publicConstructors = new SoftReference<>(res); 2410 } else { 2411 declaredConstructors = new SoftReference<>(res); 2412 } 2413 } 2414 return res; 2415 } 2416 2417 // 2418 // 2419 // java.lang.reflect.Method handling 2420 // 2421 // 2422 2423 // Returns an array of "root" methods. These Method objects must NOT 2424 // be propagated to the outside world, but must instead be copied 2425 // via ReflectionFactory.copyMethod. 2426 private Method[] privateGetDeclaredMethods(boolean publicOnly) { 2427 checkInitted(); 2428 Method[] res = null; 2429 if (useCaches) { 2430 clearCachesOnClassRedefinition(); 2431 if (publicOnly) { 2432 if (declaredPublicMethods != null) { 2433 res = declaredPublicMethods.get(); 2434 } 2435 } else { 2436 if (declaredMethods != null) { 2437 res = declaredMethods.get(); 2438 } 2439 } 2440 if (res != null) return res; 2441 } 2442 // No cached value available; request value from VM 2443 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly)); 2444 if (useCaches) { 2445 if (publicOnly) { 2446 declaredPublicMethods = new SoftReference<>(res); 2447 } else { 2448 declaredMethods = new SoftReference<>(res); 2449 } 2450 } 2451 return res; 2452 } 2453 2454 static class MethodArray { 2455 private Method[] methods; 2456 private int length; 2457 2458 MethodArray() { 2459 methods = new Method[20]; 2460 length = 0; 2461 } 2462 2463 void add(Method m) { 2464 if (length == methods.length) { 2465 methods = Arrays.copyOf(methods, 2 * methods.length); 2466 } 2467 methods[length++] = m; 2468 } 2469 2470 void addAll(Method[] ma) { 2471 for (int i = 0; i < ma.length; i++) { 2472 add(ma[i]); 2473 } 2474 } 2475 2476 void addAll(MethodArray ma) { 2477 for (int i = 0; i < ma.length(); i++) { 2478 add(ma.get(i)); 2479 } 2480 } 2481 2482 void addIfNotPresent(Method newMethod) { 2483 for (int i = 0; i < length; i++) { 2484 Method m = methods[i]; 2485 if (m == newMethod || (m != null && m.equals(newMethod))) { 2486 return; 2487 } 2488 } 2489 add(newMethod); 2490 } 2491 2492 void addAllIfNotPresent(MethodArray newMethods) { 2493 for (int i = 0; i < newMethods.length(); i++) { 2494 Method m = newMethods.get(i); 2495 if (m != null) { 2496 addIfNotPresent(m); 2497 } 2498 } 2499 } 2500 2501 int length() { 2502 return length; 2503 } 2504 2505 Method get(int i) { 2506 return methods[i]; 2507 } 2508 2509 void removeByNameAndSignature(Method toRemove) { 2510 for (int i = 0; i < length; i++) { 2511 Method m = methods[i]; 2512 if (m != null && 2513 m.getReturnType() == toRemove.getReturnType() && 2514 m.getName() == toRemove.getName() && 2515 arrayContentsEq(m.getParameterTypes(), 2516 toRemove.getParameterTypes())) { 2517 methods[i] = null; 2518 } 2519 } 2520 } 2521 2522 void compactAndTrim() { 2523 int newPos = 0; 2524 // Get rid of null slots 2525 for (int pos = 0; pos < length; pos++) { 2526 Method m = methods[pos]; 2527 if (m != null) { 2528 if (pos != newPos) { 2529 methods[newPos] = m; 2530 } 2531 newPos++; 2532 } 2533 } 2534 if (newPos != methods.length) { 2535 methods = Arrays.copyOf(methods, newPos); 2536 } 2537 } 2538 2539 Method[] getArray() { 2540 return methods; 2541 } 2542 } 2543 2544 2545 // Returns an array of "root" methods. These Method objects must NOT 2546 // be propagated to the outside world, but must instead be copied 2547 // via ReflectionFactory.copyMethod. 2548 private Method[] privateGetPublicMethods() { 2549 checkInitted(); 2550 Method[] res = null; 2551 if (useCaches) { 2552 clearCachesOnClassRedefinition(); 2553 if (publicMethods != null) { 2554 res = publicMethods.get(); 2555 } 2556 if (res != null) return res; 2557 } 2558 2559 // No cached value available; compute value recursively. 2560 // Start by fetching public declared methods 2561 MethodArray methods = new MethodArray(); 2562 { 2563 Method[] tmp = privateGetDeclaredMethods(true); 2564 methods.addAll(tmp); 2565 } 2566 // Now recur over superclass and direct superinterfaces. 2567 // Go over superinterfaces first so we can more easily filter 2568 // out concrete implementations inherited from superclasses at 2569 // the end. 2570 MethodArray inheritedMethods = new MethodArray(); 2571 Class<?>[] interfaces = getInterfaces(); 2572 for (int i = 0; i < interfaces.length; i++) { 2573 inheritedMethods.addAll(interfaces[i].privateGetPublicMethods()); 2574 } 2575 if (!isInterface()) { 2576 Class<?> c = getSuperclass(); 2577 if (c != null) { 2578 MethodArray supers = new MethodArray(); 2579 supers.addAll(c.privateGetPublicMethods()); 2580 // Filter out concrete implementations of any 2581 // interface methods 2582 for (int i = 0; i < supers.length(); i++) { 2583 Method m = supers.get(i); 2584 if (m != null && !Modifier.isAbstract(m.getModifiers())) { 2585 inheritedMethods.removeByNameAndSignature(m); 2586 } 2587 } 2588 // Insert superclass's inherited methods before 2589 // superinterfaces' to satisfy getMethod's search 2590 // order 2591 supers.addAll(inheritedMethods); 2592 inheritedMethods = supers; 2593 } 2594 } 2595 // Filter out all local methods from inherited ones 2596 for (int i = 0; i < methods.length(); i++) { 2597 Method m = methods.get(i); 2598 inheritedMethods.removeByNameAndSignature(m); 2599 } 2600 methods.addAllIfNotPresent(inheritedMethods); 2601 methods.compactAndTrim(); 2602 res = methods.getArray(); 2603 if (useCaches) { 2604 publicMethods = new SoftReference<>(res); 2605 } 2606 return res; 2607 } 2608 2609 2610 // 2611 // Helpers for fetchers of one field, method, or constructor 2612 // 2613 2614 private Field searchFields(Field[] fields, String name) { 2615 String internedName = name.intern(); 2616 for (int i = 0; i < fields.length; i++) { 2617 if (fields[i].getName() == internedName) { 2618 return getReflectionFactory().copyField(fields[i]); 2619 } 2620 } 2621 return null; 2622 } 2623 2624 private Field getField0(String name) throws NoSuchFieldException { 2625 // Note: the intent is that the search algorithm this routine 2626 // uses be equivalent to the ordering imposed by 2627 // privateGetPublicFields(). It fetches only the declared 2628 // public fields for each class, however, to reduce the number 2629 // of Field objects which have to be created for the common 2630 // case where the field being requested is declared in the 2631 // class which is being queried. 2632 Field res = null; 2633 // Search declared public fields 2634 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) { 2635 return res; 2636 } 2637 // Direct superinterfaces, recursively 2638 Class<?>[] interfaces = getInterfaces(); 2639 for (int i = 0; i < interfaces.length; i++) { 2640 Class<?> c = interfaces[i]; 2641 if ((res = c.getField0(name)) != null) { 2642 return res; 2643 } 2644 } 2645 // Direct superclass, recursively 2646 if (!isInterface()) { 2647 Class<?> c = getSuperclass(); 2648 if (c != null) { 2649 if ((res = c.getField0(name)) != null) { 2650 return res; 2651 } 2652 } 2653 } 2654 return null; 2655 } 2656 2657 private static Method searchMethods(Method[] methods, 2658 String name, 2659 Class<?>[] parameterTypes) 2660 { 2661 Method res = null; 2662 String internedName = name.intern(); 2663 for (int i = 0; i < methods.length; i++) { 2664 Method m = methods[i]; 2665 if (m.getName() == internedName 2666 && arrayContentsEq(parameterTypes, m.getParameterTypes()) 2667 && (res == null 2668 || res.getReturnType().isAssignableFrom(m.getReturnType()))) 2669 res = m; 2670 } 2671 2672 return (res == null ? res : getReflectionFactory().copyMethod(res)); 2673 } 2674 2675 2676 private Method getMethod0(String name, Class<?>[] parameterTypes) { 2677 // Note: the intent is that the search algorithm this routine 2678 // uses be equivalent to the ordering imposed by 2679 // privateGetPublicMethods(). It fetches only the declared 2680 // public methods for each class, however, to reduce the 2681 // number of Method objects which have to be created for the 2682 // common case where the method being requested is declared in 2683 // the class which is being queried. 2684 Method res = null; 2685 // Search declared public methods 2686 if ((res = searchMethods(privateGetDeclaredMethods(true), 2687 name, 2688 parameterTypes)) != null) { 2689 return res; 2690 } 2691 // Search superclass's methods 2692 if (!isInterface()) { 2693 Class<? super T> c = getSuperclass(); 2694 if (c != null) { 2695 if ((res = c.getMethod0(name, parameterTypes)) != null) { 2696 return res; 2697 } 2698 } 2699 } 2700 // Search superinterfaces' methods 2701 Class<?>[] interfaces = getInterfaces(); 2702 for (int i = 0; i < interfaces.length; i++) { 2703 Class<?> c = interfaces[i]; 2704 if ((res = c.getMethod0(name, parameterTypes)) != null) { 2705 return res; 2706 } 2707 } 2708 // Not found 2709 return null; 2710 } 2711 2712 private Constructor<T> getConstructor0(Class<?>[] parameterTypes, 2713 int which) throws NoSuchMethodException 2714 { 2715 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC)); 2716 for (Constructor<T> constructor : constructors) { 2717 if (arrayContentsEq(parameterTypes, 2718 constructor.getParameterTypes())) { 2719 return getReflectionFactory().copyConstructor(constructor); 2720 } 2721 } 2722 throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes)); 2723 } 2724 2725 // 2726 // Other helpers and base implementation 2727 // 2728 2729 private static boolean arrayContentsEq(Object[] a1, Object[] a2) { 2730 if (a1 == null) { 2731 return a2 == null || a2.length == 0; 2732 } 2733 2734 if (a2 == null) { 2735 return a1.length == 0; 2736 } 2737 2738 if (a1.length != a2.length) { 2739 return false; 2740 } 2741 2742 for (int i = 0; i < a1.length; i++) { 2743 if (a1[i] != a2[i]) { 2744 return false; 2745 } 2746 } 2747 2748 return true; 2749 } 2750 2751 private static Field[] copyFields(Field[] arg) { 2752 Field[] out = new Field[arg.length]; 2753 ReflectionFactory fact = getReflectionFactory(); 2754 for (int i = 0; i < arg.length; i++) { 2755 out[i] = fact.copyField(arg[i]); 2756 } 2757 return out; 2758 } 2759 2760 private static Method[] copyMethods(Method[] arg) { 2761 Method[] out = new Method[arg.length]; 2762 ReflectionFactory fact = getReflectionFactory(); 2763 for (int i = 0; i < arg.length; i++) { 2764 out[i] = fact.copyMethod(arg[i]); 2765 } 2766 return out; 2767 } 2768 2769 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) { 2770 Constructor<U>[] out = arg.clone(); 2771 ReflectionFactory fact = getReflectionFactory(); 2772 for (int i = 0; i < out.length; i++) { 2773 out[i] = fact.copyConstructor(out[i]); 2774 } 2775 return out; 2776 } 2777 2778 private native Field[] getDeclaredFields0(boolean publicOnly); 2779 private native Method[] getDeclaredMethods0(boolean publicOnly); 2780 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly); 2781 private native Class<?>[] getDeclaredClasses0(); 2782 2783 private static String argumentTypesToString(Class<?>[] argTypes) { 2784 StringBuilder buf = new StringBuilder(); 2785 buf.append("("); 2786 if (argTypes != null) { 2787 for (int i = 0; i < argTypes.length; i++) { 2788 if (i > 0) { 2789 buf.append(", "); 2790 } 2791 Class<?> c = argTypes[i]; 2792 buf.append((c == null) ? "null" : c.getName()); 2793 } 2794 } 2795 buf.append(")"); 2796 return buf.toString(); 2797 } 2798 2799 /** use serialVersionUID from JDK 1.1 for interoperability */ 2800 private static final long serialVersionUID = 3206093459760846163L; 2801 2802 2803 /** 2804 * Class Class is special cased within the Serialization Stream Protocol. 2805 * 2806 * A Class instance is written initially into an ObjectOutputStream in the 2807 * following format: 2808 * <pre> 2809 * {@code TC_CLASS} ClassDescriptor 2810 * A ClassDescriptor is a special cased serialization of 2811 * a {@code java.io.ObjectStreamClass} instance. 2812 * </pre> 2813 * A new handle is generated for the initial time the class descriptor 2814 * is written into the stream. Future references to the class descriptor 2815 * are written as references to the initial class descriptor instance. 2816 * 2817 * @see java.io.ObjectStreamClass 2818 */ 2819 private static final ObjectStreamField[] serialPersistentFields = 2820 new ObjectStreamField[0]; 2821 2822 2823 /** 2824 * Returns the assertion status that would be assigned to this 2825 * class if it were to be initialized at the time this method is invoked. 2826 * If this class has had its assertion status set, the most recent 2827 * setting will be returned; otherwise, if any package default assertion 2828 * status pertains to this class, the most recent setting for the most 2829 * specific pertinent package default assertion status is returned; 2830 * otherwise, if this class is not a system class (i.e., it has a 2831 * class loader) its class loader's default assertion status is returned; 2832 * otherwise, the system class default assertion status is returned. 2833 * <p> 2834 * Few programmers will have any need for this method; it is provided 2835 * for the benefit of the JRE itself. (It allows a class to determine at 2836 * the time that it is initialized whether assertions should be enabled.) 2837 * Note that this method is not guaranteed to return the actual 2838 * assertion status that was (or will be) associated with the specified 2839 * class when it was (or will be) initialized. 2840 * 2841 * @return the desired assertion status of the specified class. 2842 * @see java.lang.ClassLoader#setClassAssertionStatus 2843 * @see java.lang.ClassLoader#setPackageAssertionStatus 2844 * @see java.lang.ClassLoader#setDefaultAssertionStatus 2845 * @since 1.4 2846 */ 2847 public boolean desiredAssertionStatus() { 2848 ClassLoader loader = getClassLoader(); 2849 // If the loader is null this is a system class, so ask the VM 2850 if (loader == null) 2851 return desiredAssertionStatus0(this); 2852 2853 // If the classloader has been initialized with the assertion 2854 // directives, ask it. Otherwise, ask the VM. 2855 synchronized(loader.assertionLock) { 2856 if (loader.classAssertionStatus != null) { 2857 return loader.desiredAssertionStatus(getName()); 2858 } 2859 } 2860 return desiredAssertionStatus0(this); 2861 } 2862 2863 // Retrieves the desired assertion status of this class from the VM 2864 private static native boolean desiredAssertionStatus0(Class<?> clazz); 2865 2866 /** 2867 * Returns true if and only if this class was declared as an enum in the 2868 * source code. 2869 * 2870 * @return true if and only if this class was declared as an enum in the 2871 * source code 2872 * @since 1.5 2873 */ 2874 public boolean isEnum() { 2875 // An enum must both directly extend java.lang.Enum and have 2876 // the ENUM bit set; classes for specialized enum constants 2877 // don't do the former. 2878 return (this.getModifiers() & ENUM) != 0 && 2879 this.getSuperclass() == java.lang.Enum.class; 2880 } 2881 2882 // Fetches the factory for reflective objects 2883 private static ReflectionFactory getReflectionFactory() { 2884 if (reflectionFactory == null) { 2885 reflectionFactory = 2886 java.security.AccessController.doPrivileged 2887 (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction()); 2888 } 2889 return reflectionFactory; 2890 } 2891 private static ReflectionFactory reflectionFactory; 2892 2893 // To be able to query system properties as soon as they're available 2894 private static boolean initted = false; 2895 private static void checkInitted() { 2896 if (initted) return; 2897 AccessController.doPrivileged(new PrivilegedAction<Void>() { 2898 public Void run() { 2899 // Tests to ensure the system properties table is fully 2900 // initialized. This is needed because reflection code is 2901 // called very early in the initialization process (before 2902 // command-line arguments have been parsed and therefore 2903 // these user-settable properties installed.) We assume that 2904 // if System.out is non-null then the System class has been 2905 // fully initialized and that the bulk of the startup code 2906 // has been run. 2907 2908 if (System.out == null) { 2909 // java.lang.System not yet fully initialized 2910 return null; 2911 } 2912 2913 // Doesn't use Boolean.getBoolean to avoid class init. 2914 String val = 2915 System.getProperty("sun.reflect.noCaches"); 2916 if (val != null && val.equals("true")) { 2917 useCaches = false; 2918 } 2919 2920 initted = true; 2921 return null; 2922 } 2923 }); 2924 } 2925 2926 /** 2927 * Returns the elements of this enum class or null if this 2928 * Class object does not represent an enum type. 2929 * 2930 * @return an array containing the values comprising the enum class 2931 * represented by this Class object in the order they're 2932 * declared, or null if this Class object does not 2933 * represent an enum type 2934 * @since 1.5 2935 */ 2936 public T[] getEnumConstants() { 2937 T[] values = getEnumConstantsShared(); 2938 return (values != null) ? values.clone() : null; 2939 } 2940 2941 /** 2942 * Returns the elements of this enum class or null if this 2943 * Class object does not represent an enum type; 2944 * identical to getEnumConstants except that the result is 2945 * uncloned, cached, and shared by all callers. 2946 */ 2947 T[] getEnumConstantsShared() { 2948 if (enumConstants == null) { 2949 if (!isEnum()) return null; 2950 try { 2951 final Method values = getMethod("values"); 2952 java.security.AccessController.doPrivileged( 2953 new java.security.PrivilegedAction<Void>() { 2954 public Void run() { 2955 values.setAccessible(true); 2956 return null; 2957 } 2958 }); 2959 @SuppressWarnings("unchecked") 2960 T[] temporaryConstants = (T[])values.invoke(null); 2961 enumConstants = temporaryConstants; 2962 } 2963 // These can happen when users concoct enum-like classes 2964 // that don't comply with the enum spec. 2965 catch (InvocationTargetException | NoSuchMethodException | 2966 IllegalAccessException ex) { return null; } 2967 } 2968 return enumConstants; 2969 } 2970 private volatile transient T[] enumConstants = null; 2971 2972 /** 2973 * Returns a map from simple name to enum constant. This package-private 2974 * method is used internally by Enum to implement 2975 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)} 2976 * efficiently. Note that the map is returned by this method is 2977 * created lazily on first use. Typically it won't ever get created. 2978 */ 2979 Map<String, T> enumConstantDirectory() { 2980 if (enumConstantDirectory == null) { 2981 T[] universe = getEnumConstantsShared(); 2982 if (universe == null) 2983 throw new IllegalArgumentException( 2984 getName() + " is not an enum type"); 2985 Map<String, T> m = new HashMap<>(2 * universe.length); 2986 for (T constant : universe) 2987 m.put(((Enum<?>)constant).name(), constant); 2988 enumConstantDirectory = m; 2989 } 2990 return enumConstantDirectory; 2991 } 2992 private volatile transient Map<String, T> enumConstantDirectory = null; 2993 2994 /** 2995 * Casts an object to the class or interface represented 2996 * by this {@code Class} object. 2997 * 2998 * @param obj the object to be cast 2999 * @return the object after casting, or null if obj is null 3000 * 3001 * @throws ClassCastException if the object is not 3002 * null and is not assignable to the type T. 3003 * 3004 * @since 1.5 3005 */ 3006 @SuppressWarnings("unchecked") 3007 public T cast(Object obj) { 3008 if (obj != null && !isInstance(obj)) 3009 throw new ClassCastException(cannotCastMsg(obj)); 3010 return (T) obj; 3011 } 3012 3013 private String cannotCastMsg(Object obj) { 3014 return "Cannot cast " + obj.getClass().getName() + " to " + getName(); 3015 } 3016 3017 /** 3018 * Casts this {@code Class} object to represent a subclass of the class 3019 * represented by the specified class object. Checks that the cast 3020 * is valid, and throws a {@code ClassCastException} if it is not. If 3021 * this method succeeds, it always returns a reference to this class object. 3022 * 3023 * <p>This method is useful when a client needs to "narrow" the type of 3024 * a {@code Class} object to pass it to an API that restricts the 3025 * {@code Class} objects that it is willing to accept. A cast would 3026 * generate a compile-time warning, as the correctness of the cast 3027 * could not be checked at runtime (because generic types are implemented 3028 * by erasure). 3029 * 3030 * @return this {@code Class} object, cast to represent a subclass of 3031 * the specified class object. 3032 * @throws ClassCastException if this {@code Class} object does not 3033 * represent a subclass of the specified class (here "subclass" includes 3034 * the class itself). 3035 * @since 1.5 3036 */ 3037 @SuppressWarnings("unchecked") 3038 public <U> Class<? extends U> asSubclass(Class<U> clazz) { 3039 if (clazz.isAssignableFrom(this)) 3040 return (Class<? extends U>) this; 3041 else 3042 throw new ClassCastException(this.toString()); 3043 } 3044 3045 /** 3046 * @throws NullPointerException {@inheritDoc} 3047 * @since 1.5 3048 */ 3049 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) { 3050 Objects.requireNonNull(annotationClass); 3051 3052 initAnnotationsIfNecessary(); 3053 return AnnotationSupport.getOneAnnotation(annotations, annotationClass); 3054 } 3055 3056 /** 3057 * @throws NullPointerException {@inheritDoc} 3058 * @since 1.5 3059 */ 3060 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) { 3061 Objects.requireNonNull(annotationClass); 3062 3063 return getAnnotation(annotationClass) != null; 3064 } 3065 3066 /** 3067 * @throws NullPointerException {@inheritDoc} 3068 * @since 1.8 3069 */ 3070 public <A extends Annotation> A[] getAnnotations(Class<A> annotationClass) { 3071 Objects.requireNonNull(annotationClass); 3072 3073 initAnnotationsIfNecessary(); 3074 return AnnotationSupport.getMultipleAnnotations(annotations, annotationClass); 3075 } 3076 3077 /** 3078 * @since 1.5 3079 */ 3080 public Annotation[] getAnnotations() { 3081 initAnnotationsIfNecessary(); 3082 return AnnotationSupport.unpackToArray(annotations); 3083 } 3084 3085 /** 3086 * @throws NullPointerException {@inheritDoc} 3087 * @since 1.8 3088 */ 3089 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) { 3090 Objects.requireNonNull(annotationClass); 3091 3092 initAnnotationsIfNecessary(); 3093 return AnnotationSupport.getOneAnnotation(declaredAnnotations, annotationClass); 3094 } 3095 3096 /** 3097 * @throws NullPointerException {@inheritDoc} 3098 * @since 1.8 3099 */ 3100 public <A extends Annotation> A[] getDeclaredAnnotations(Class<A> annotationClass) { 3101 Objects.requireNonNull(annotationClass); 3102 3103 initAnnotationsIfNecessary(); 3104 return AnnotationSupport.getMultipleAnnotations(declaredAnnotations, annotationClass); 3105 } 3106 3107 /** 3108 * @since 1.5 3109 */ 3110 public Annotation[] getDeclaredAnnotations() { 3111 initAnnotationsIfNecessary(); 3112 return AnnotationSupport.unpackToArray(declaredAnnotations); 3113 } 3114 3115 /** Returns one "directly" present annotation or null */ 3116 <A extends Annotation> A getDirectDeclaredAnnotation(Class<A> annotationClass) { 3117 Objects.requireNonNull(annotationClass); 3118 3119 initAnnotationsIfNecessary(); 3120 @SuppressWarnings("unchecked") // TODO check safe 3121 A ret = (A)declaredAnnotations.get(annotationClass); 3122 return ret; 3123 } 3124 3125 // Annotations cache 3126 private transient Map<Class<? extends Annotation>, Annotation> annotations; 3127 private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations; 3128 3129 private synchronized void initAnnotationsIfNecessary() { 3130 clearCachesOnClassRedefinition(); 3131 if (annotations != null) 3132 return; 3133 declaredAnnotations = AnnotationParser.parseAnnotations( 3134 getRawAnnotations(), getConstantPool(), this); 3135 Class<?> superClass = getSuperclass(); 3136 if (superClass == null) { 3137 annotations = declaredAnnotations; 3138 } else { 3139 annotations = new HashMap<>(); 3140 superClass.initAnnotationsIfNecessary(); 3141 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superClass.annotations.entrySet()) { 3142 Class<? extends Annotation> annotationClass = e.getKey(); 3143 if (AnnotationType.getInstance(annotationClass).isInherited()) 3144 annotations.put(annotationClass, e.getValue()); 3145 } 3146 annotations.putAll(declaredAnnotations); 3147 } 3148 } 3149 3150 // Annotation types cache their internal (AnnotationType) form 3151 3152 private AnnotationType annotationType; 3153 3154 void setAnnotationType(AnnotationType type) { 3155 annotationType = type; 3156 } 3157 3158 AnnotationType getAnnotationType() { 3159 return annotationType; 3160 } 3161 3162 /* Backing store of user-defined values pertaining to this class. 3163 * Maintained by the ClassValue class. 3164 */ 3165 transient ClassValue.ClassValueMap classValueMap; 3166 }