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