1 /*
2 * Copyright (c) 1994, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang;
27
28 import java.lang.reflect.Array;
29 import java.lang.reflect.GenericArrayType;
30 import java.lang.reflect.Member;
31 import java.lang.reflect.Field;
32 import java.lang.reflect.Method;
33 import java.lang.reflect.Constructor;
34 import java.lang.reflect.Modifier;
35 import java.lang.reflect.Type;
36 import java.lang.reflect.TypeVariable;
37 import java.lang.reflect.InvocationTargetException;
38 import java.lang.ref.SoftReference;
39 import java.io.InputStream;
40 import java.io.ObjectStreamField;
41 import java.security.AccessController;
42 import java.security.PrivilegedAction;
43 import java.util.ArrayList;
44 import java.util.Arrays;
45 import java.util.Collection;
46 import java.util.HashSet;
47 import java.util.List;
48 import java.util.Set;
49 import java.util.Map;
50 import java.util.HashMap;
51 import java.util.Objects;
52 import sun.misc.Unsafe;
53 import sun.reflect.ConstantPool;
54 import sun.reflect.Reflection;
55 import sun.reflect.ReflectionFactory;
56 import sun.reflect.generics.factory.CoreReflectionFactory;
57 import sun.reflect.generics.factory.GenericsFactory;
58 import sun.reflect.generics.repository.ClassRepository;
59 import sun.reflect.generics.repository.MethodRepository;
60 import sun.reflect.generics.repository.ConstructorRepository;
61 import sun.reflect.generics.scope.ClassScope;
62 import sun.security.util.SecurityConstants;
63 import java.lang.annotation.Annotation;
64 import sun.reflect.annotation.*;
65
66 /**
67 * Instances of the class {@code Class} represent classes and
68 * interfaces in a running Java application. An enum is a kind of
69 * class and an annotation is a kind of interface. Every array also
70 * belongs to a class that is reflected as a {@code Class} object
71 * that is shared by all arrays with the same element type and number
72 * of dimensions. The primitive Java types ({@code boolean},
73 * {@code byte}, {@code char}, {@code short},
74 * {@code int}, {@code long}, {@code float}, and
75 * {@code double}), and the keyword {@code void} are also
76 * represented as {@code Class} objects.
77 *
78 * <p> {@code Class} has no public constructor. Instead {@code Class}
79 * objects are constructed automatically by the Java Virtual Machine as classes
80 * are loaded and by calls to the {@code defineClass} method in the class
81 * loader.
82 *
83 * <p> The following example uses a {@code Class} object to print the
84 * class name of an object:
85 *
86 * <p> <blockquote><pre>
87 * void printClassName(Object obj) {
88 * System.out.println("The class of " + obj +
89 * " is " + obj.getClass().getName());
90 * }
91 * </pre></blockquote>
92 *
93 * <p> It is also possible to get the {@code Class} object for a named
94 * type (or for void) using a class literal. See Section 15.8.2 of
95 * <cite>The Java™ Language Specification</cite>.
96 * For example:
97 *
98 * <p> <blockquote>
99 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
100 * </blockquote>
101 *
102 * @param <T> the type of the class modeled by this {@code Class}
103 * object. For example, the type of {@code String.class} is {@code
104 * Class<String>}. Use {@code Class<?>} if the class being modeled is
105 * unknown.
106 *
107 * @author unascribed
108 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
109 * @since JDK1.0
110 */
111 public final
112 class Class<T> implements java.io.Serializable,
113 java.lang.reflect.GenericDeclaration,
114 java.lang.reflect.Type,
115 java.lang.reflect.AnnotatedElement {
116 private static final int ANNOTATION= 0x00002000;
117 private static final int ENUM = 0x00004000;
118 private static final int SYNTHETIC = 0x00001000;
119
120 private static native void registerNatives();
121 static {
122 registerNatives();
123 }
124
125 /*
126 * Constructor. Only the Java Virtual Machine creates Class
127 * objects.
128 */
129 private Class() {}
130
131
132 /**
133 * Converts the object to a string. The string representation is the
134 * string "class" or "interface", followed by a space, and then by the
135 * fully qualified name of the class in the format returned by
136 * {@code getName}. If this {@code Class} object represents a
137 * primitive type, this method returns the name of the primitive type. If
138 * this {@code Class} object represents void this method returns
139 * "void".
140 *
141 * @return a string representation of this class object.
142 */
143 public String toString() {
144 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
145 + getName();
146 }
147
148
149 /**
150 * Returns the {@code Class} object associated with the class or
151 * interface with the given string name. Invoking this method is
152 * equivalent to:
153 *
154 * <blockquote>
155 * {@code Class.forName(className, true, currentLoader)}
156 * </blockquote>
157 *
158 * where {@code currentLoader} denotes the defining class loader of
159 * the current class.
160 *
161 * <p> For example, the following code fragment returns the
162 * runtime {@code Class} descriptor for the class named
163 * {@code java.lang.Thread}:
164 *
165 * <blockquote>
166 * {@code Class t = Class.forName("java.lang.Thread")}
167 * </blockquote>
168 * <p>
169 * A call to {@code forName("X")} causes the class named
170 * {@code X} to be initialized.
171 *
172 * @param className the fully qualified name of the desired class.
173 * @return the {@code Class} object for the class with the
174 * specified name.
175 * @exception LinkageError if the linkage fails
176 * @exception ExceptionInInitializerError if the initialization provoked
177 * by this method fails
178 * @exception ClassNotFoundException if the class cannot be located
179 */
180 public static Class<?> forName(String className)
181 throws ClassNotFoundException {
182 return forName0(className, true, ClassLoader.getCallerClassLoader());
183 }
184
185
186 /**
187 * Returns the {@code Class} object associated with the class or
188 * interface with the given string name, using the given class loader.
189 * Given the fully qualified name for a class or interface (in the same
190 * format returned by {@code getName}) this method attempts to
191 * locate, load, and link the class or interface. The specified class
192 * loader is used to load the class or interface. If the parameter
193 * {@code loader} is null, the class is loaded through the bootstrap
194 * class loader. The class is initialized only if the
195 * {@code initialize} parameter is {@code true} and if it has
196 * not been initialized earlier.
197 *
198 * <p> If {@code name} denotes a primitive type or void, an attempt
199 * will be made to locate a user-defined class in the unnamed package whose
200 * name is {@code name}. Therefore, this method cannot be used to
201 * obtain any of the {@code Class} objects representing primitive
202 * types or void.
203 *
204 * <p> If {@code name} denotes an array class, the component type of
205 * the array class is loaded but not initialized.
206 *
207 * <p> For example, in an instance method the expression:
208 *
209 * <blockquote>
210 * {@code Class.forName("Foo")}
211 * </blockquote>
212 *
213 * is equivalent to:
214 *
215 * <blockquote>
216 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
217 * </blockquote>
218 *
219 * Note that this method throws errors related to loading, linking or
220 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
221 * Java Language Specification</em>.
222 * Note that this method does not check whether the requested class
223 * is accessible to its caller.
224 *
225 * <p> If the {@code loader} is {@code null}, and a security
226 * manager is present, and the caller's class loader is not null, then this
227 * method calls the security manager's {@code checkPermission} method
228 * with a {@code RuntimePermission("getClassLoader")} permission to
229 * ensure it's ok to access the bootstrap class loader.
230 *
231 * @param name fully qualified name of the desired class
232 * @param initialize if {@code true} the class will be initialized.
233 * See Section 12.4 of <em>The Java Language Specification</em>.
234 * @param loader class loader from which the class must be loaded
235 * @return class object representing the desired class
236 *
237 * @exception LinkageError if the linkage fails
238 * @exception ExceptionInInitializerError if the initialization provoked
239 * by this method fails
240 * @exception ClassNotFoundException if the class cannot be located by
241 * the specified class loader
242 *
243 * @see java.lang.Class#forName(String)
244 * @see java.lang.ClassLoader
245 * @since 1.2
246 */
247 public static Class<?> forName(String name, boolean initialize,
248 ClassLoader loader)
249 throws ClassNotFoundException
250 {
251 if (loader == null) {
252 SecurityManager sm = System.getSecurityManager();
253 if (sm != null) {
254 ClassLoader ccl = ClassLoader.getCallerClassLoader();
255 if (ccl != null) {
256 sm.checkPermission(
257 SecurityConstants.GET_CLASSLOADER_PERMISSION);
258 }
259 }
260 }
261 return forName0(name, initialize, loader);
262 }
263
264 /** Called after security checks have been made. */
265 private static native Class<?> forName0(String name, boolean initialize,
266 ClassLoader loader)
267 throws ClassNotFoundException;
268
269 /**
270 * Creates a new instance of the class represented by this {@code Class}
271 * object. The class is instantiated as if by a {@code new}
272 * expression with an empty argument list. The class is initialized if it
273 * has not already been initialized.
274 *
275 * <p>Note that this method propagates any exception thrown by the
276 * nullary constructor, including a checked exception. Use of
277 * this method effectively bypasses the compile-time exception
278 * checking that would otherwise be performed by the compiler.
279 * The {@link
280 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
281 * Constructor.newInstance} method avoids this problem by wrapping
282 * any exception thrown by the constructor in a (checked) {@link
283 * java.lang.reflect.InvocationTargetException}.
284 *
285 * @return a newly allocated instance of the class represented by this
286 * object.
287 * @exception IllegalAccessException if the class or its nullary
288 * constructor is not accessible.
289 * @exception InstantiationException
290 * if this {@code Class} represents an abstract class,
291 * an interface, an array class, a primitive type, or void;
292 * or if the class has no nullary constructor;
293 * or if the instantiation fails for some other reason.
294 * @exception ExceptionInInitializerError if the initialization
295 * provoked by this method fails.
296 * @exception SecurityException
297 * If a security manager, <i>s</i>, is present and any of the
298 * following conditions is met:
299 *
300 * <ul>
301 *
302 * <li> invocation of
303 * {@link SecurityManager#checkMemberAccess
304 * s.checkMemberAccess(this, Member.PUBLIC)} denies
305 * creation of new instances of this class
306 *
307 * <li> the caller's class loader is not the same as or an
308 * ancestor of the class loader for the current class and
309 * invocation of {@link SecurityManager#checkPackageAccess
310 * s.checkPackageAccess()} denies access to the package
311 * of this class
312 *
313 * </ul>
314 *
315 */
316 public T newInstance()
317 throws InstantiationException, IllegalAccessException
318 {
319 if (System.getSecurityManager() != null) {
320 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
321 }
322 return newInstance0();
323 }
324
325 private T newInstance0()
326 throws InstantiationException, IllegalAccessException
327 {
328 // NOTE: the following code may not be strictly correct under
329 // the current Java memory model.
330
331 // Constructor lookup
332 if (cachedConstructor == null) {
333 if (this == Class.class) {
334 throw new IllegalAccessException(
335 "Can not call newInstance() on the Class for java.lang.Class"
336 );
337 }
338 try {
339 Class<?>[] empty = {};
340 final Constructor<T> c = getConstructor0(empty, Member.DECLARED);
341 // Disable accessibility checks on the constructor
342 // since we have to do the security check here anyway
343 // (the stack depth is wrong for the Constructor's
344 // security check to work)
345 java.security.AccessController.doPrivileged(
346 new java.security.PrivilegedAction<Void>() {
347 public Void run() {
348 c.setAccessible(true);
349 return null;
350 }
351 });
352 cachedConstructor = c;
353 } catch (NoSuchMethodException e) {
354 throw (InstantiationException)
355 new InstantiationException(getName()).initCause(e);
356 }
357 }
358 Constructor<T> tmpConstructor = cachedConstructor;
359 // Security check (same as in java.lang.reflect.Constructor)
360 int modifiers = tmpConstructor.getModifiers();
361 if (!Reflection.quickCheckMemberAccess(this, modifiers)) {
362 Class<?> caller = Reflection.getCallerClass(3);
363 if (newInstanceCallerCache != caller) {
364 Reflection.ensureMemberAccess(caller, this, null, modifiers);
365 newInstanceCallerCache = caller;
366 }
367 }
368 // Run constructor
369 try {
370 return tmpConstructor.newInstance((Object[])null);
371 } catch (InvocationTargetException e) {
372 Unsafe.getUnsafe().throwException(e.getTargetException());
373 // Not reached
374 return null;
375 }
376 }
377 private volatile transient Constructor<T> cachedConstructor;
378 private volatile transient Class<?> newInstanceCallerCache;
379
380
381 /**
382 * Determines if the specified {@code Object} is assignment-compatible
383 * with the object represented by this {@code Class}. This method is
384 * the dynamic equivalent of the Java language {@code instanceof}
385 * operator. The method returns {@code true} if the specified
386 * {@code Object} argument is non-null and can be cast to the
387 * reference type represented by this {@code Class} object without
388 * raising a {@code ClassCastException.} It returns {@code false}
389 * otherwise.
390 *
391 * <p> Specifically, if this {@code Class} object represents a
392 * declared class, this method returns {@code true} if the specified
393 * {@code Object} argument is an instance of the represented class (or
394 * of any of its subclasses); it returns {@code false} otherwise. If
395 * this {@code Class} object represents an array class, this method
396 * returns {@code true} if the specified {@code Object} argument
397 * can be converted to an object of the array class by an identity
398 * conversion or by a widening reference conversion; it returns
399 * {@code false} otherwise. If this {@code Class} object
400 * represents an interface, this method returns {@code true} if the
401 * class or any superclass of the specified {@code Object} argument
402 * implements this interface; it returns {@code false} otherwise. If
403 * this {@code Class} object represents a primitive type, this method
404 * returns {@code false}.
405 *
406 * @param obj the object to check
407 * @return true if {@code obj} is an instance of this class
408 *
409 * @since JDK1.1
410 */
411 public native boolean isInstance(Object obj);
412
413
414 /**
415 * Determines if the class or interface represented by this
416 * {@code Class} object is either the same as, or is a superclass or
417 * superinterface of, the class or interface represented by the specified
418 * {@code Class} parameter. It returns {@code true} if so;
419 * otherwise it returns {@code false}. If this {@code Class}
420 * object represents a primitive type, this method returns
421 * {@code true} if the specified {@code Class} parameter is
422 * exactly this {@code Class} object; otherwise it returns
423 * {@code false}.
424 *
425 * <p> Specifically, this method tests whether the type represented by the
426 * specified {@code Class} parameter can be converted to the type
427 * represented by this {@code Class} object via an identity conversion
428 * or via a widening reference conversion. See <em>The Java Language
429 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
430 *
431 * @param cls the {@code Class} object to be checked
432 * @return the {@code boolean} value indicating whether objects of the
433 * type {@code cls} can be assigned to objects of this class
434 * @exception NullPointerException if the specified Class parameter is
435 * null.
436 * @since JDK1.1
437 */
438 public native boolean isAssignableFrom(Class<?> cls);
439
440
441 /**
442 * Determines if the specified {@code Class} object represents an
443 * interface type.
444 *
445 * @return {@code true} if this object represents an interface;
446 * {@code false} otherwise.
447 */
448 public native boolean isInterface();
449
450
451 /**
452 * Determines if this {@code Class} object represents an array class.
453 *
454 * @return {@code true} if this object represents an array class;
455 * {@code false} otherwise.
456 * @since JDK1.1
457 */
458 public native boolean isArray();
459
460
461 /**
462 * Determines if the specified {@code Class} object represents a
463 * primitive type.
464 *
465 * <p> There are nine predefined {@code Class} objects to represent
466 * the eight primitive types and void. These are created by the Java
467 * Virtual Machine, and have the same names as the primitive types that
468 * they represent, namely {@code boolean}, {@code byte},
469 * {@code char}, {@code short}, {@code int},
470 * {@code long}, {@code float}, and {@code double}.
471 *
472 * <p> These objects may only be accessed via the following public static
473 * final variables, and are the only {@code Class} objects for which
474 * this method returns {@code true}.
475 *
476 * @return true if and only if this class represents a primitive type
477 *
478 * @see java.lang.Boolean#TYPE
479 * @see java.lang.Character#TYPE
480 * @see java.lang.Byte#TYPE
481 * @see java.lang.Short#TYPE
482 * @see java.lang.Integer#TYPE
483 * @see java.lang.Long#TYPE
484 * @see java.lang.Float#TYPE
485 * @see java.lang.Double#TYPE
486 * @see java.lang.Void#TYPE
487 * @since JDK1.1
488 */
489 public native boolean isPrimitive();
490
491 /**
492 * Returns true if this {@code Class} object represents an annotation
493 * type. Note that if this method returns true, {@link #isInterface()}
494 * would also return true, as all annotation types are also interfaces.
495 *
496 * @return {@code true} if this class object represents an annotation
497 * type; {@code false} otherwise
498 * @since 1.5
499 */
500 public boolean isAnnotation() {
501 return (getModifiers() & ANNOTATION) != 0;
502 }
503
504 /**
505 * Returns {@code true} if this class is a synthetic class;
506 * returns {@code false} otherwise.
507 * @return {@code true} if and only if this class is a synthetic class as
508 * defined by the Java Language Specification.
509 * @since 1.5
510 */
511 public boolean isSynthetic() {
512 return (getModifiers() & SYNTHETIC) != 0;
513 }
514
515 /**
516 * Returns the name of the entity (class, interface, array class,
517 * primitive type, or void) represented by this {@code Class} object,
518 * as a {@code String}.
519 *
520 * <p> If this class object represents a reference type that is not an
521 * array type then the binary name of the class is returned, as specified
522 * by
523 * <cite>The Java™ Language Specification</cite>.
524 *
525 * <p> If this class object represents a primitive type or void, then the
526 * name returned is a {@code String} equal to the Java language
527 * keyword corresponding to the primitive type or void.
528 *
529 * <p> If this class object represents a class of arrays, then the internal
530 * form of the name consists of the name of the element type preceded by
531 * one or more '{@code [}' characters representing the depth of the array
532 * nesting. The encoding of element type names is as follows:
533 *
534 * <blockquote><table summary="Element types and encodings">
535 * <tr><th> Element Type <th> <th> Encoding
536 * <tr><td> boolean <td> <td align=center> Z
537 * <tr><td> byte <td> <td align=center> B
538 * <tr><td> char <td> <td align=center> C
539 * <tr><td> class or interface
540 * <td> <td align=center> L<i>classname</i>;
541 * <tr><td> double <td> <td align=center> D
542 * <tr><td> float <td> <td align=center> F
543 * <tr><td> int <td> <td align=center> I
544 * <tr><td> long <td> <td align=center> J
545 * <tr><td> short <td> <td align=center> S
546 * </table></blockquote>
547 *
548 * <p> The class or interface name <i>classname</i> is the binary name of
549 * the class specified above.
550 *
551 * <p> Examples:
552 * <blockquote><pre>
553 * String.class.getName()
554 * returns "java.lang.String"
555 * byte.class.getName()
556 * returns "byte"
557 * (new Object[3]).getClass().getName()
558 * returns "[Ljava.lang.Object;"
559 * (new int[3][4][5][6][7][8][9]).getClass().getName()
560 * returns "[[[[[[[I"
561 * </pre></blockquote>
562 *
563 * @return the name of the class or interface
564 * represented by this object.
565 */
566 public String getName() {
567 String name = this.name;
568 if (name == null)
569 this.name = name = getName0();
570 return name;
571 }
572
573 // cache the name to reduce the number of calls into the VM
574 private transient String name;
575 private native String getName0();
576
577 /**
578 * Returns the class loader for the class. Some implementations may use
579 * null to represent the bootstrap class loader. This method will return
580 * null in such implementations if this class was loaded by the bootstrap
581 * class loader.
582 *
583 * <p> If a security manager is present, and the caller's class loader is
584 * not null and the caller's class loader is not the same as or an ancestor of
585 * the class loader for the class whose class loader is requested, then
586 * this method calls the security manager's {@code checkPermission}
587 * method with a {@code RuntimePermission("getClassLoader")}
588 * permission to ensure it's ok to access the class loader for the class.
589 *
590 * <p>If this object
591 * represents a primitive type or void, null is returned.
592 *
593 * @return the class loader that loaded the class or interface
594 * represented by this object.
595 * @throws SecurityException
596 * if a security manager exists and its
597 * {@code checkPermission} method denies
598 * access to the class loader for the class.
599 * @see java.lang.ClassLoader
600 * @see SecurityManager#checkPermission
601 * @see java.lang.RuntimePermission
602 */
603 public ClassLoader getClassLoader() {
604 ClassLoader cl = getClassLoader0();
605 if (cl == null)
606 return null;
607 SecurityManager sm = System.getSecurityManager();
608 if (sm != null) {
609 ClassLoader ccl = ClassLoader.getCallerClassLoader();
610 if (ClassLoader.needsClassLoaderPermissionCheck(ccl, cl)) {
611 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
612 }
613 }
614 return cl;
615 }
616
617 // Package-private to allow ClassLoader access
618 native ClassLoader getClassLoader0();
619
620
621 /**
622 * Returns an array of {@code TypeVariable} objects that represent the
623 * type variables declared by the generic declaration represented by this
624 * {@code GenericDeclaration} object, in declaration order. Returns an
625 * array of length 0 if the underlying generic declaration declares no type
626 * variables.
627 *
628 * @return an array of {@code TypeVariable} objects that represent
629 * the type variables declared by this generic declaration
630 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
631 * signature of this generic declaration does not conform to
632 * the format specified in
633 * <cite>The Java™ Virtual Machine Specification</cite>
634 * @since 1.5
635 */
636 @SuppressWarnings("unchecked")
637 public TypeVariable<Class<T>>[] getTypeParameters() {
638 if (getGenericSignature() != null)
639 return (TypeVariable<Class<T>>[])getGenericInfo().getTypeParameters();
640 else
641 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
642 }
643
644
645 /**
646 * Returns the {@code Class} representing the superclass of the entity
647 * (class, interface, primitive type or void) represented by this
648 * {@code Class}. If this {@code Class} represents either the
649 * {@code Object} class, an interface, a primitive type, or void, then
650 * null is returned. If this object represents an array class then the
651 * {@code Class} object representing the {@code Object} class is
652 * returned.
653 *
654 * @return the superclass of the class represented by this object.
655 */
656 public native Class<? super T> getSuperclass();
657
658
659 /**
660 * Returns the {@code Type} representing the direct superclass of
661 * the entity (class, interface, primitive type or void) represented by
662 * this {@code Class}.
663 *
664 * <p>If the superclass is a parameterized type, the {@code Type}
665 * object returned must accurately reflect the actual type
666 * parameters used in the source code. The parameterized type
667 * representing the superclass is created if it had not been
668 * created before. See the declaration of {@link
669 * java.lang.reflect.ParameterizedType ParameterizedType} for the
670 * semantics of the creation process for parameterized types. If
671 * this {@code Class} represents either the {@code Object}
672 * class, an interface, a primitive type, or void, then null is
673 * returned. If this object represents an array class then the
674 * {@code Class} object representing the {@code Object} class is
675 * returned.
676 *
677 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
678 * class signature does not conform to the format specified in
679 * <cite>The Java™ Virtual Machine Specification</cite>
680 * @throws TypeNotPresentException if the generic superclass
681 * refers to a non-existent type declaration
682 * @throws java.lang.reflect.MalformedParameterizedTypeException if the
683 * generic superclass refers to a parameterized type that cannot be
684 * instantiated for any reason
685 * @return the superclass of the class represented by this object
686 * @since 1.5
687 */
688 public Type getGenericSuperclass() {
689 if (getGenericSignature() != null) {
690 // Historical irregularity:
691 // Generic signature marks interfaces with superclass = Object
692 // but this API returns null for interfaces
693 if (isInterface())
694 return null;
695 return getGenericInfo().getSuperclass();
696 } else
697 return getSuperclass();
698 }
699
700 /**
701 * Gets the package for this class. The class loader of this class is used
702 * to find the package. If the class was loaded by the bootstrap class
703 * loader the set of packages loaded from CLASSPATH is searched to find the
704 * package of the class. Null is returned if no package object was created
705 * by the class loader of this class.
706 *
707 * <p> Packages have attributes for versions and specifications only if the
708 * information was defined in the manifests that accompany the classes, and
709 * if the class loader created the package instance with the attributes
710 * from the manifest.
711 *
712 * @return the package of the class, or null if no package
713 * information is available from the archive or codebase.
714 */
715 public Package getPackage() {
716 return Package.getPackage(this);
717 }
718
719
720 /**
721 * Determines the interfaces implemented by the class or interface
722 * represented by this object.
723 *
724 * <p> If this object represents a class, the return value is an array
725 * containing objects representing all interfaces implemented by the
726 * class. The order of the interface objects in the array corresponds to
727 * the order of the interface names in the {@code implements} clause
728 * of the declaration of the class represented by this object. For
729 * example, given the declaration:
730 * <blockquote>
731 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
732 * </blockquote>
733 * suppose the value of {@code s} is an instance of
734 * {@code Shimmer}; the value of the expression:
735 * <blockquote>
736 * {@code s.getClass().getInterfaces()[0]}
737 * </blockquote>
738 * is the {@code Class} object that represents interface
739 * {@code FloorWax}; and the value of:
740 * <blockquote>
741 * {@code s.getClass().getInterfaces()[1]}
742 * </blockquote>
743 * is the {@code Class} object that represents interface
744 * {@code DessertTopping}.
745 *
746 * <p> If this object represents an interface, the array contains objects
747 * representing all interfaces extended by the interface. The order of the
748 * interface objects in the array corresponds to the order of the interface
749 * names in the {@code extends} clause of the declaration of the
750 * interface represented by this object.
751 *
752 * <p> If this object represents a class or interface that implements no
753 * interfaces, the method returns an array of length 0.
754 *
755 * <p> If this object represents a primitive type or void, the method
756 * returns an array of length 0.
757 *
758 * @return an array of interfaces implemented by this class.
759 */
760 public native Class<?>[] getInterfaces();
761
762 /**
763 * Returns the {@code Type}s representing the interfaces
764 * directly implemented by the class or interface represented by
765 * this object.
766 *
767 * <p>If a superinterface is a parameterized type, the
768 * {@code Type} object returned for it must accurately reflect
769 * the actual type parameters used in the source code. The
770 * parameterized type representing each superinterface is created
771 * if it had not been created before. See the declaration of
772 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
773 * for the semantics of the creation process for parameterized
774 * types.
775 *
776 * <p> If this object represents a class, the return value is an
777 * array containing objects representing all interfaces
778 * implemented by the class. The order of the interface objects in
779 * the array corresponds to the order of the interface names in
780 * the {@code implements} clause of the declaration of the class
781 * represented by this object. In the case of an array class, the
782 * interfaces {@code Cloneable} and {@code Serializable} are
783 * returned in that order.
784 *
785 * <p>If this object represents an interface, the array contains
786 * objects representing all interfaces directly extended by the
787 * interface. The order of the interface objects in the array
788 * corresponds to the order of the interface names in the
789 * {@code extends} clause of the declaration of the interface
790 * represented by this object.
791 *
792 * <p>If this object represents a class or interface that
793 * implements no interfaces, the method returns an array of length
794 * 0.
795 *
796 * <p>If this object represents a primitive type or void, the
797 * method returns an array of length 0.
798 *
799 * @throws java.lang.reflect.GenericSignatureFormatError
800 * if the generic class signature does not conform to the format
801 * specified in
802 * <cite>The Java™ Virtual Machine Specification</cite>
803 * @throws TypeNotPresentException if any of the generic
804 * superinterfaces refers to a non-existent type declaration
805 * @throws java.lang.reflect.MalformedParameterizedTypeException
806 * if any of the generic superinterfaces refer to a parameterized
807 * type that cannot be instantiated for any reason
808 * @return an array of interfaces implemented by this class
809 * @since 1.5
810 */
811 public Type[] getGenericInterfaces() {
812 if (getGenericSignature() != null)
813 return getGenericInfo().getSuperInterfaces();
814 else
815 return getInterfaces();
816 }
817
818
819 /**
820 * Returns the {@code Class} representing the component type of an
821 * array. If this class does not represent an array class this method
822 * returns null.
823 *
824 * @return the {@code Class} representing the component type of this
825 * class if this class is an array
826 * @see java.lang.reflect.Array
827 * @since JDK1.1
828 */
829 public native Class<?> getComponentType();
830
831
832 /**
833 * Returns the Java language modifiers for this class or interface, encoded
834 * in an integer. The modifiers consist of the Java Virtual Machine's
835 * constants for {@code public}, {@code protected},
836 * {@code private}, {@code final}, {@code static},
837 * {@code abstract} and {@code interface}; they should be decoded
838 * using the methods of class {@code Modifier}.
839 *
840 * <p> If the underlying class is an array class, then its
841 * {@code public}, {@code private} and {@code protected}
842 * modifiers are the same as those of its component type. If this
843 * {@code Class} represents a primitive type or void, its
844 * {@code public} modifier is always {@code true}, and its
845 * {@code protected} and {@code private} modifiers are always
846 * {@code false}. If this object represents an array class, a
847 * primitive type or void, then its {@code final} modifier is always
848 * {@code true} and its interface modifier is always
849 * {@code false}. The values of its other modifiers are not determined
850 * by this specification.
851 *
852 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
853 * Specification</em>, table 4.1.
854 *
855 * @return the {@code int} representing the modifiers for this class
856 * @see java.lang.reflect.Modifier
857 * @since JDK1.1
858 */
859 public native int getModifiers();
860
861
862 /**
863 * Gets the signers of this class.
864 *
865 * @return the signers of this class, or null if there are no signers. In
866 * particular, this method returns null if this object represents
867 * a primitive type or void.
868 * @since JDK1.1
869 */
870 public native Object[] getSigners();
871
872
873 /**
874 * Set the signers of this class.
875 */
876 native void setSigners(Object[] signers);
877
878
879 /**
880 * If this {@code Class} object represents a local or anonymous
881 * class within a method, returns a {@link
882 * java.lang.reflect.Method Method} object representing the
883 * immediately enclosing method of the underlying class. Returns
884 * {@code null} otherwise.
885 *
886 * In particular, this method returns {@code null} if the underlying
887 * class is a local or anonymous class immediately enclosed by a type
888 * declaration, instance initializer or static initializer.
889 *
890 * @return the immediately enclosing method of the underlying class, if
891 * that class is a local or anonymous class; otherwise {@code null}.
892 * @since 1.5
893 */
894 public Method getEnclosingMethod() {
895 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
896
897 if (enclosingInfo == null)
898 return null;
899 else {
900 if (!enclosingInfo.isMethod())
901 return null;
902
903 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
904 getFactory());
905 Class<?> returnType = toClass(typeInfo.getReturnType());
906 Type [] parameterTypes = typeInfo.getParameterTypes();
907 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
908
909 // Convert Types to Classes; returned types *should*
910 // be class objects since the methodDescriptor's used
911 // don't have generics information
912 for(int i = 0; i < parameterClasses.length; i++)
913 parameterClasses[i] = toClass(parameterTypes[i]);
914
915 /*
916 * Loop over all declared methods; match method name,
917 * number of and type of parameters, *and* return
918 * type. Matching return type is also necessary
919 * because of covariant returns, etc.
920 */
921 for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) {
922 if (m.getName().equals(enclosingInfo.getName()) ) {
923 Class<?>[] candidateParamClasses = m.getParameterTypes();
924 if (candidateParamClasses.length == parameterClasses.length) {
925 boolean matches = true;
926 for(int i = 0; i < candidateParamClasses.length; i++) {
927 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
928 matches = false;
929 break;
930 }
931 }
932
933 if (matches) { // finally, check return type
934 if (m.getReturnType().equals(returnType) )
935 return m;
936 }
937 }
938 }
939 }
940
941 throw new InternalError("Enclosing method not found");
942 }
943 }
944
945 private native Object[] getEnclosingMethod0();
946
947 private EnclosingMethodInfo getEnclosingMethodInfo() {
948 Object[] enclosingInfo = getEnclosingMethod0();
949 if (enclosingInfo == null)
950 return null;
951 else {
952 return new EnclosingMethodInfo(enclosingInfo);
953 }
954 }
955
956 private final static class EnclosingMethodInfo {
957 private Class<?> enclosingClass;
958 private String name;
959 private String descriptor;
960
961 private EnclosingMethodInfo(Object[] enclosingInfo) {
962 if (enclosingInfo.length != 3)
963 throw new InternalError("Malformed enclosing method information");
964 try {
965 // The array is expected to have three elements:
966
967 // the immediately enclosing class
968 enclosingClass = (Class<?>) enclosingInfo[0];
969 assert(enclosingClass != null);
970
971 // the immediately enclosing method or constructor's
972 // name (can be null).
973 name = (String) enclosingInfo[1];
974
975 // the immediately enclosing method or constructor's
976 // descriptor (null iff name is).
977 descriptor = (String) enclosingInfo[2];
978 assert((name != null && descriptor != null) || name == descriptor);
979 } catch (ClassCastException cce) {
980 throw new InternalError("Invalid type in enclosing method information", cce);
981 }
982 }
983
984 boolean isPartial() {
985 return enclosingClass == null || name == null || descriptor == null;
986 }
987
988 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
989
990 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
991
992 Class<?> getEnclosingClass() { return enclosingClass; }
993
994 String getName() { return name; }
995
996 String getDescriptor() { return descriptor; }
997
998 }
999
1000 private static Class<?> toClass(Type o) {
1001 if (o instanceof GenericArrayType)
1002 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1003 0)
1004 .getClass();
1005 return (Class<?>)o;
1006 }
1007
1008 /**
1009 * If this {@code Class} object represents a local or anonymous
1010 * class within a constructor, returns a {@link
1011 * java.lang.reflect.Constructor Constructor} object representing
1012 * the immediately enclosing constructor of the underlying
1013 * class. Returns {@code null} otherwise. In particular, this
1014 * method returns {@code null} if the underlying class is a local
1015 * or anonymous class immediately enclosed by a type declaration,
1016 * instance initializer or static initializer.
1017 *
1018 * @return the immediately enclosing constructor of the underlying class, if
1019 * that class is a local or anonymous class; otherwise {@code null}.
1020 * @since 1.5
1021 */
1022 public Constructor<?> getEnclosingConstructor() {
1023 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1024
1025 if (enclosingInfo == null)
1026 return null;
1027 else {
1028 if (!enclosingInfo.isConstructor())
1029 return null;
1030
1031 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1032 getFactory());
1033 Type [] parameterTypes = typeInfo.getParameterTypes();
1034 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1035
1036 // Convert Types to Classes; returned types *should*
1037 // be class objects since the methodDescriptor's used
1038 // don't have generics information
1039 for(int i = 0; i < parameterClasses.length; i++)
1040 parameterClasses[i] = toClass(parameterTypes[i]);
1041
1042 /*
1043 * Loop over all declared constructors; match number
1044 * of and type of parameters.
1045 */
1046 for(Constructor<?> c: enclosingInfo.getEnclosingClass().getDeclaredConstructors()) {
1047 Class<?>[] candidateParamClasses = c.getParameterTypes();
1048 if (candidateParamClasses.length == parameterClasses.length) {
1049 boolean matches = true;
1050 for(int i = 0; i < candidateParamClasses.length; i++) {
1051 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1052 matches = false;
1053 break;
1054 }
1055 }
1056
1057 if (matches)
1058 return c;
1059 }
1060 }
1061
1062 throw new InternalError("Enclosing constructor not found");
1063 }
1064 }
1065
1066
1067 /**
1068 * If the class or interface represented by this {@code Class} object
1069 * is a member of another class, returns the {@code Class} object
1070 * representing the class in which it was declared. This method returns
1071 * null if this class or interface is not a member of any other class. If
1072 * this {@code Class} object represents an array class, a primitive
1073 * type, or void,then this method returns null.
1074 *
1075 * @return the declaring class for this class
1076 * @since JDK1.1
1077 */
1078 public native Class<?> getDeclaringClass();
1079
1080
1081 /**
1082 * Returns the immediately enclosing class of the underlying
1083 * class. If the underlying class is a top level class this
1084 * method returns {@code null}.
1085 * @return the immediately enclosing class of the underlying class
1086 * @since 1.5
1087 */
1088 public Class<?> getEnclosingClass() {
1089 // There are five kinds of classes (or interfaces):
1090 // a) Top level classes
1091 // b) Nested classes (static member classes)
1092 // c) Inner classes (non-static member classes)
1093 // d) Local classes (named classes declared within a method)
1094 // e) Anonymous classes
1095
1096
1097 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1098 // attribute if and only if it is a local class or an
1099 // anonymous class.
1100 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1101
1102 if (enclosingInfo == null) {
1103 // This is a top level or a nested class or an inner class (a, b, or c)
1104 return getDeclaringClass();
1105 } else {
1106 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1107 // This is a local class or an anonymous class (d or e)
1108 if (enclosingClass == this || enclosingClass == null)
1109 throw new InternalError("Malformed enclosing method information");
1110 else
1111 return enclosingClass;
1112 }
1113 }
1114
1115 /**
1116 * Returns the simple name of the underlying class as given in the
1117 * source code. Returns an empty string if the underlying class is
1118 * anonymous.
1119 *
1120 * <p>The simple name of an array is the simple name of the
1121 * component type with "[]" appended. In particular the simple
1122 * name of an array whose component type is anonymous is "[]".
1123 *
1124 * @return the simple name of the underlying class
1125 * @since 1.5
1126 */
1127 public String getSimpleName() {
1128 if (isArray())
1129 return getComponentType().getSimpleName()+"[]";
1130
1131 String simpleName = getSimpleBinaryName();
1132 if (simpleName == null) { // top level class
1133 simpleName = getName();
1134 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
1135 }
1136 // According to JLS3 "Binary Compatibility" (13.1) the binary
1137 // name of non-package classes (not top level) is the binary
1138 // name of the immediately enclosing class followed by a '$' followed by:
1139 // (for nested and inner classes): the simple name.
1140 // (for local classes): 1 or more digits followed by the simple name.
1141 // (for anonymous classes): 1 or more digits.
1142
1143 // Since getSimpleBinaryName() will strip the binary name of
1144 // the immediatly enclosing class, we are now looking at a
1145 // string that matches the regular expression "\$[0-9]*"
1146 // followed by a simple name (considering the simple of an
1147 // anonymous class to be the empty string).
1148
1149 // Remove leading "\$[0-9]*" from the name
1150 int length = simpleName.length();
1151 if (length < 1 || simpleName.charAt(0) != '$')
1152 throw new InternalError("Malformed class name");
1153 int index = 1;
1154 while (index < length && isAsciiDigit(simpleName.charAt(index)))
1155 index++;
1156 // Eventually, this is the empty string iff this is an anonymous class
1157 return simpleName.substring(index);
1158 }
1159
1160 /**
1161 * Character.isDigit answers {@code true} to some non-ascii
1162 * digits. This one does not.
1163 */
1164 private static boolean isAsciiDigit(char c) {
1165 return '0' <= c && c <= '9';
1166 }
1167
1168 /**
1169 * Returns the canonical name of the underlying class as
1170 * defined by the Java Language Specification. Returns null if
1171 * the underlying class does not have a canonical name (i.e., if
1172 * it is a local or anonymous class or an array whose component
1173 * type does not have a canonical name).
1174 * @return the canonical name of the underlying class if it exists, and
1175 * {@code null} otherwise.
1176 * @since 1.5
1177 */
1178 public String getCanonicalName() {
1179 if (isArray()) {
1180 String canonicalName = getComponentType().getCanonicalName();
1181 if (canonicalName != null)
1182 return canonicalName + "[]";
1183 else
1184 return null;
1185 }
1186 if (isLocalOrAnonymousClass())
1187 return null;
1188 Class<?> enclosingClass = getEnclosingClass();
1189 if (enclosingClass == null) { // top level class
1190 return getName();
1191 } else {
1192 String enclosingName = enclosingClass.getCanonicalName();
1193 if (enclosingName == null)
1194 return null;
1195 return enclosingName + "." + getSimpleName();
1196 }
1197 }
1198
1199 /**
1200 * Returns {@code true} if and only if the underlying class
1201 * is an anonymous class.
1202 *
1203 * @return {@code true} if and only if this class is an anonymous class.
1204 * @since 1.5
1205 */
1206 public boolean isAnonymousClass() {
1207 return "".equals(getSimpleName());
1208 }
1209
1210 /**
1211 * Returns {@code true} if and only if the underlying class
1212 * is a local class.
1213 *
1214 * @return {@code true} if and only if this class is a local class.
1215 * @since 1.5
1216 */
1217 public boolean isLocalClass() {
1218 return isLocalOrAnonymousClass() && !isAnonymousClass();
1219 }
1220
1221 /**
1222 * Returns {@code true} if and only if the underlying class
1223 * is a member class.
1224 *
1225 * @return {@code true} if and only if this class is a member class.
1226 * @since 1.5
1227 */
1228 public boolean isMemberClass() {
1229 return getSimpleBinaryName() != null && !isLocalOrAnonymousClass();
1230 }
1231
1232 /**
1233 * Returns the "simple binary name" of the underlying class, i.e.,
1234 * the binary name without the leading enclosing class name.
1235 * Returns {@code null} if the underlying class is a top level
1236 * class.
1237 */
1238 private String getSimpleBinaryName() {
1239 Class<?> enclosingClass = getEnclosingClass();
1240 if (enclosingClass == null) // top level class
1241 return null;
1242 // Otherwise, strip the enclosing class' name
1243 try {
1244 return getName().substring(enclosingClass.getName().length());
1245 } catch (IndexOutOfBoundsException ex) {
1246 throw new InternalError("Malformed class name", ex);
1247 }
1248 }
1249
1250 /**
1251 * Returns {@code true} if this is a local class or an anonymous
1252 * class. Returns {@code false} otherwise.
1253 */
1254 private boolean isLocalOrAnonymousClass() {
1255 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1256 // attribute if and only if it is a local class or an
1257 // anonymous class.
1258 return getEnclosingMethodInfo() != null;
1259 }
1260
1261 /**
1262 * Returns an array containing {@code Class} objects representing all
1263 * the public classes and interfaces that are members of the class
1264 * represented by this {@code Class} object. This includes public
1265 * class and interface members inherited from superclasses and public class
1266 * and interface members declared by the class. This method returns an
1267 * array of length 0 if this {@code Class} object has no public member
1268 * classes or interfaces. This method also returns an array of length 0 if
1269 * this {@code Class} object represents a primitive type, an array
1270 * class, or void.
1271 *
1272 * @return the array of {@code Class} objects representing the public
1273 * members of this class
1274 * @exception SecurityException
1275 * If a security manager, <i>s</i>, is present and any of the
1276 * following conditions is met:
1277 *
1278 * <ul>
1279 *
1280 * <li> invocation of
1281 * {@link SecurityManager#checkMemberAccess
1282 * s.checkMemberAccess(this, Member.PUBLIC)} method
1283 * denies access to the classes within this class
1284 *
1285 * <li> the caller's class loader is not the same as or an
1286 * ancestor of the class loader for the current class and
1287 * invocation of {@link SecurityManager#checkPackageAccess
1288 * s.checkPackageAccess()} denies access to the package
1289 * of this class
1290 *
1291 * </ul>
1292 *
1293 * @since JDK1.1
1294 */
1295 public Class<?>[] getClasses() {
1296 // be very careful not to change the stack depth of this
1297 // checkMemberAccess call for security reasons
1298 // see java.lang.SecurityManager.checkMemberAccess
1299 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1300
1301 // Privileged so this implementation can look at DECLARED classes,
1302 // something the caller might not have privilege to do. The code here
1303 // is allowed to look at DECLARED classes because (1) it does not hand
1304 // out anything other than public members and (2) public member access
1305 // has already been ok'd by the SecurityManager.
1306
1307 return java.security.AccessController.doPrivileged(
1308 new java.security.PrivilegedAction<Class<?>[]>() {
1309 public Class<?>[] run() {
1310 List<Class<?>> list = new ArrayList<>();
1311 Class<?> currentClass = Class.this;
1312 while (currentClass != null) {
1313 Class<?>[] members = currentClass.getDeclaredClasses();
1314 for (int i = 0; i < members.length; i++) {
1315 if (Modifier.isPublic(members[i].getModifiers())) {
1316 list.add(members[i]);
1317 }
1318 }
1319 currentClass = currentClass.getSuperclass();
1320 }
1321 return list.toArray(new Class<?>[0]);
1322 }
1323 });
1324 }
1325
1326
1327 /**
1328 * Returns an array containing {@code Field} objects reflecting all
1329 * the accessible public fields of the class or interface represented by
1330 * this {@code Class} object. The elements in the array returned are
1331 * not sorted and are not in any particular order. This method returns an
1332 * array of length 0 if the class or interface has no accessible public
1333 * fields, or if it represents an array class, a primitive type, or void.
1334 *
1335 * <p> Specifically, if this {@code Class} object represents a class,
1336 * this method returns the public fields of this class and of all its
1337 * superclasses. If this {@code Class} object represents an
1338 * interface, this method returns the fields of this interface and of all
1339 * its superinterfaces.
1340 *
1341 * <p> The implicit length field for array class is not reflected by this
1342 * method. User code should use the methods of class {@code Array} to
1343 * manipulate arrays.
1344 *
1345 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
1346 *
1347 * @return the array of {@code Field} objects representing the
1348 * public fields
1349 * @exception SecurityException
1350 * If a security manager, <i>s</i>, is present and any of the
1351 * following conditions is met:
1352 *
1353 * <ul>
1354 *
1355 * <li> invocation of
1356 * {@link SecurityManager#checkMemberAccess
1357 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1358 * access to the fields within this class
1359 *
1360 * <li> the caller's class loader is not the same as or an
1361 * ancestor of the class loader for the current class and
1362 * invocation of {@link SecurityManager#checkPackageAccess
1363 * s.checkPackageAccess()} denies access to the package
1364 * of this class
1365 *
1366 * </ul>
1367 *
1368 * @since JDK1.1
1369 */
1370 public Field[] getFields() throws SecurityException {
1371 // be very careful not to change the stack depth of this
1372 // checkMemberAccess call for security reasons
1373 // see java.lang.SecurityManager.checkMemberAccess
1374 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1375 return copyFields(privateGetPublicFields(null));
1376 }
1377
1378
1379 /**
1380 * Returns an array containing {@code Method} objects reflecting all
1381 * the public <em>member</em> methods of the class or interface represented
1382 * by this {@code Class} object, including those declared by the class
1383 * or interface and those inherited from superclasses and
1384 * superinterfaces. Array classes return all the (public) member methods
1385 * inherited from the {@code Object} class. The elements in the array
1386 * returned are not sorted and are not in any particular order. This
1387 * method returns an array of length 0 if this {@code Class} object
1388 * represents a class or interface that has no public member methods, or if
1389 * this {@code Class} object represents a primitive type or void.
1390 *
1391 * <p> The class initialization method {@code <clinit>} is not
1392 * included in the returned array. If the class declares multiple public
1393 * member methods with the same parameter types, they are all included in
1394 * the returned array.
1395 *
1396 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
1397 *
1398 * @return the array of {@code Method} objects representing the
1399 * public methods of this class
1400 * @exception SecurityException
1401 * If a security manager, <i>s</i>, is present and any of the
1402 * following conditions is met:
1403 *
1404 * <ul>
1405 *
1406 * <li> invocation of
1407 * {@link SecurityManager#checkMemberAccess
1408 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1409 * access to the methods within this class
1410 *
1411 * <li> the caller's class loader is not the same as or an
1412 * ancestor of the class loader for the current class and
1413 * invocation of {@link SecurityManager#checkPackageAccess
1414 * s.checkPackageAccess()} denies access to the package
1415 * of this class
1416 *
1417 * </ul>
1418 *
1419 * @since JDK1.1
1420 */
1421 public Method[] getMethods() throws SecurityException {
1422 // be very careful not to change the stack depth of this
1423 // checkMemberAccess call for security reasons
1424 // see java.lang.SecurityManager.checkMemberAccess
1425 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1426 return copyMethods(privateGetPublicMethods());
1427 }
1428
1429
1430 /**
1431 * Returns an array containing {@code Constructor} objects reflecting
1432 * all the public constructors of the class represented by this
1433 * {@code Class} object. An array of length 0 is returned if the
1434 * class has no public constructors, or if the class is an array class, or
1435 * if the class reflects a primitive type or void.
1436 *
1437 * Note that while this method returns an array of {@code
1438 * Constructor<T>} objects (that is an array of constructors from
1439 * this class), the return type of this method is {@code
1440 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1441 * might be expected. This less informative return type is
1442 * necessary since after being returned from this method, the
1443 * array could be modified to hold {@code Constructor} objects for
1444 * different classes, which would violate the type guarantees of
1445 * {@code Constructor<T>[]}.
1446 *
1447 * @return the array of {@code Constructor} objects representing the
1448 * public constructors of this class
1449 * @exception SecurityException
1450 * If a security manager, <i>s</i>, is present and any of the
1451 * following conditions is met:
1452 *
1453 * <ul>
1454 *
1455 * <li> invocation of
1456 * {@link SecurityManager#checkMemberAccess
1457 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1458 * access to the constructors within this class
1459 *
1460 * <li> the caller's class loader is not the same as or an
1461 * ancestor of the class loader for the current class and
1462 * invocation of {@link SecurityManager#checkPackageAccess
1463 * s.checkPackageAccess()} denies access to the package
1464 * of this class
1465 *
1466 * </ul>
1467 *
1468 * @since JDK1.1
1469 */
1470 public Constructor<?>[] getConstructors() throws SecurityException {
1471 // be very careful not to change the stack depth of this
1472 // checkMemberAccess call for security reasons
1473 // see java.lang.SecurityManager.checkMemberAccess
1474 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1475 return copyConstructors(privateGetDeclaredConstructors(true));
1476 }
1477
1478
1479 /**
1480 * Returns a {@code Field} object that reflects the specified public
1481 * member field of the class or interface represented by this
1482 * {@code Class} object. The {@code name} parameter is a
1483 * {@code String} specifying the simple name of the desired field.
1484 *
1485 * <p> The field to be reflected is determined by the algorithm that
1486 * follows. Let C be the class represented by this object:
1487 * <OL>
1488 * <LI> If C declares a public field with the name specified, that is the
1489 * field to be reflected.</LI>
1490 * <LI> If no field was found in step 1 above, this algorithm is applied
1491 * recursively to each direct superinterface of C. The direct
1492 * superinterfaces are searched in the order they were declared.</LI>
1493 * <LI> If no field was found in steps 1 and 2 above, and C has a
1494 * superclass S, then this algorithm is invoked recursively upon S.
1495 * If C has no superclass, then a {@code NoSuchFieldException}
1496 * is thrown.</LI>
1497 * </OL>
1498 *
1499 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
1500 *
1501 * @param name the field name
1502 * @return the {@code Field} object of this class specified by
1503 * {@code name}
1504 * @exception NoSuchFieldException if a field with the specified name is
1505 * not found.
1506 * @exception NullPointerException if {@code name} is {@code null}
1507 * @exception SecurityException
1508 * If a security manager, <i>s</i>, is present and any of the
1509 * following conditions is met:
1510 *
1511 * <ul>
1512 *
1513 * <li> invocation of
1514 * {@link SecurityManager#checkMemberAccess
1515 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1516 * access to the field
1517 *
1518 * <li> the caller's class loader is not the same as or an
1519 * ancestor of the class loader for the current class and
1520 * invocation of {@link SecurityManager#checkPackageAccess
1521 * s.checkPackageAccess()} denies access to the package
1522 * of this class
1523 *
1524 * </ul>
1525 *
1526 * @since JDK1.1
1527 */
1528 public Field getField(String name)
1529 throws NoSuchFieldException, SecurityException {
1530 // be very careful not to change the stack depth of this
1531 // checkMemberAccess call for security reasons
1532 // see java.lang.SecurityManager.checkMemberAccess
1533 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1534 Field field = getField0(name);
1535 if (field == null) {
1536 throw new NoSuchFieldException(name);
1537 }
1538 return field;
1539 }
1540
1541
1542 /**
1543 * Returns a {@code Method} object that reflects the specified public
1544 * member method of the class or interface represented by this
1545 * {@code Class} object. The {@code name} parameter is a
1546 * {@code String} specifying the simple name of the desired method. The
1547 * {@code parameterTypes} parameter is an array of {@code Class}
1548 * objects that identify the method's formal parameter types, in declared
1549 * order. If {@code parameterTypes} is {@code null}, it is
1550 * treated as if it were an empty array.
1551 *
1552 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
1553 * {@code NoSuchMethodException} is raised. Otherwise, the method to
1554 * be reflected is determined by the algorithm that follows. Let C be the
1555 * class represented by this object:
1556 * <OL>
1557 * <LI> C is searched for any <I>matching methods</I>. If no matching
1558 * method is found, the algorithm of step 1 is invoked recursively on
1559 * the superclass of C.</LI>
1560 * <LI> If no method was found in step 1 above, the superinterfaces of C
1561 * are searched for a matching method. If any such method is found, it
1562 * is reflected.</LI>
1563 * </OL>
1564 *
1565 * To find a matching method in a class C: If C declares exactly one
1566 * public method with the specified name and exactly the same formal
1567 * parameter types, that is the method reflected. If more than one such
1568 * method is found in C, and one of these methods has a return type that is
1569 * more specific than any of the others, that method is reflected;
1570 * otherwise one of the methods is chosen arbitrarily.
1571 *
1572 * <p>Note that there may be more than one matching method in a
1573 * class because while the Java language forbids a class to
1574 * declare multiple methods with the same signature but different
1575 * return types, the Java virtual machine does not. This
1576 * increased flexibility in the virtual machine can be used to
1577 * implement various language features. For example, covariant
1578 * returns can be implemented with {@linkplain
1579 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1580 * method and the method being overridden would have the same
1581 * signature but different return types.
1582 *
1583 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
1584 *
1585 * @param name the name of the method
1586 * @param parameterTypes the list of parameters
1587 * @return the {@code Method} object that matches the specified
1588 * {@code name} and {@code parameterTypes}
1589 * @exception NoSuchMethodException if a matching method is not found
1590 * or if the name is "<init>"or "<clinit>".
1591 * @exception NullPointerException if {@code name} is {@code null}
1592 * @exception SecurityException
1593 * If a security manager, <i>s</i>, is present and any of the
1594 * following conditions is met:
1595 *
1596 * <ul>
1597 *
1598 * <li> invocation of
1599 * {@link SecurityManager#checkMemberAccess
1600 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1601 * access to the method
1602 *
1603 * <li> the caller's class loader is not the same as or an
1604 * ancestor of the class loader for the current class and
1605 * invocation of {@link SecurityManager#checkPackageAccess
1606 * s.checkPackageAccess()} denies access to the package
1607 * of this class
1608 *
1609 * </ul>
1610 *
1611 * @since JDK1.1
1612 */
1613 public Method getMethod(String name, Class<?>... parameterTypes)
1614 throws NoSuchMethodException, SecurityException {
1615 // be very careful not to change the stack depth of this
1616 // checkMemberAccess call for security reasons
1617 // see java.lang.SecurityManager.checkMemberAccess
1618 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1619 Method method = getMethod0(name, parameterTypes);
1620 if (method == null) {
1621 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1622 }
1623 return method;
1624 }
1625
1626
1627 /**
1628 * Returns a {@code Constructor} object that reflects the specified
1629 * public constructor of the class represented by this {@code Class}
1630 * object. The {@code parameterTypes} parameter is an array of
1631 * {@code Class} objects that identify the constructor's formal
1632 * parameter types, in declared order.
1633 *
1634 * If this {@code Class} object represents an inner class
1635 * declared in a non-static context, the formal parameter types
1636 * include the explicit enclosing instance as the first parameter.
1637 *
1638 * <p> The constructor to reflect is the public constructor of the class
1639 * represented by this {@code Class} object whose formal parameter
1640 * types match those specified by {@code parameterTypes}.
1641 *
1642 * @param parameterTypes the parameter array
1643 * @return the {@code Constructor} object of the public constructor that
1644 * matches the specified {@code parameterTypes}
1645 * @exception NoSuchMethodException if a matching method is not found.
1646 * @exception SecurityException
1647 * If a security manager, <i>s</i>, is present and any of the
1648 * following conditions is met:
1649 *
1650 * <ul>
1651 *
1652 * <li> invocation of
1653 * {@link SecurityManager#checkMemberAccess
1654 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1655 * access to the constructor
1656 *
1657 * <li> the caller's class loader is not the same as or an
1658 * ancestor of the class loader for the current class and
1659 * invocation of {@link SecurityManager#checkPackageAccess
1660 * s.checkPackageAccess()} denies access to the package
1661 * of this class
1662 *
1663 * </ul>
1664 *
1665 * @since JDK1.1
1666 */
1667 public Constructor<T> getConstructor(Class<?>... parameterTypes)
1668 throws NoSuchMethodException, SecurityException {
1669 // be very careful not to change the stack depth of this
1670 // checkMemberAccess call for security reasons
1671 // see java.lang.SecurityManager.checkMemberAccess
1672 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1673 return getConstructor0(parameterTypes, Member.PUBLIC);
1674 }
1675
1676
1677 /**
1678 * Returns an array of {@code Class} objects reflecting all the
1679 * classes and interfaces declared as members of the class represented by
1680 * this {@code Class} object. This includes public, protected, default
1681 * (package) access, and private classes and interfaces declared by the
1682 * class, but excludes inherited classes and interfaces. This method
1683 * returns an array of length 0 if the class declares no classes or
1684 * interfaces as members, or if this {@code Class} object represents a
1685 * primitive type, an array class, or void.
1686 *
1687 * @return the array of {@code Class} objects representing all the
1688 * declared members of this class
1689 * @exception SecurityException
1690 * If a security manager, <i>s</i>, is present and any of the
1691 * following conditions is met:
1692 *
1693 * <ul>
1694 *
1695 * <li> invocation of
1696 * {@link SecurityManager#checkMemberAccess
1697 * s.checkMemberAccess(this, Member.DECLARED)} denies
1698 * access to the declared classes within this class
1699 *
1700 * <li> the caller's class loader is not the same as or an
1701 * ancestor of the class loader for the current class and
1702 * invocation of {@link SecurityManager#checkPackageAccess
1703 * s.checkPackageAccess()} denies access to the package
1704 * of this class
1705 *
1706 * </ul>
1707 *
1708 * @since JDK1.1
1709 */
1710 public Class<?>[] getDeclaredClasses() throws SecurityException {
1711 // be very careful not to change the stack depth of this
1712 // checkMemberAccess call for security reasons
1713 // see java.lang.SecurityManager.checkMemberAccess
1714 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1715 return getDeclaredClasses0();
1716 }
1717
1718
1719 /**
1720 * Returns an array of {@code Field} objects reflecting all the fields
1721 * declared by the class or interface represented by this
1722 * {@code Class} object. This includes public, protected, default
1723 * (package) access, and private fields, but excludes inherited fields.
1724 * The elements in the array returned are not sorted and are not in any
1725 * particular order. This method returns an array of length 0 if the class
1726 * or interface declares no fields, or if this {@code Class} object
1727 * represents a primitive type, an array class, or void.
1728 *
1729 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
1730 *
1731 * @return the array of {@code Field} objects representing all the
1732 * declared fields of this class
1733 * @exception SecurityException
1734 * If a security manager, <i>s</i>, is present and any of the
1735 * following conditions is met:
1736 *
1737 * <ul>
1738 *
1739 * <li> invocation of
1740 * {@link SecurityManager#checkMemberAccess
1741 * s.checkMemberAccess(this, Member.DECLARED)} denies
1742 * access to the declared fields within this class
1743 *
1744 * <li> the caller's class loader is not the same as or an
1745 * ancestor of the class loader for the current class and
1746 * invocation of {@link SecurityManager#checkPackageAccess
1747 * s.checkPackageAccess()} denies access to the package
1748 * of this class
1749 *
1750 * </ul>
1751 *
1752 * @since JDK1.1
1753 */
1754 public Field[] getDeclaredFields() throws SecurityException {
1755 // be very careful not to change the stack depth of this
1756 // checkMemberAccess call for security reasons
1757 // see java.lang.SecurityManager.checkMemberAccess
1758 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1759 return copyFields(privateGetDeclaredFields(false));
1760 }
1761
1762
1763 /**
1764 * Returns an array of {@code Method} objects reflecting all the
1765 * methods declared by the class or interface represented by this
1766 * {@code Class} object. This includes public, protected, default
1767 * (package) access, and private methods, but excludes inherited methods.
1768 * The elements in the array returned are not sorted and are not in any
1769 * particular order. This method returns an array of length 0 if the class
1770 * or interface declares no methods, or if this {@code Class} object
1771 * represents a primitive type, an array class, or void. The class
1772 * initialization method {@code <clinit>} is not included in the
1773 * returned array. If the class declares multiple public member methods
1774 * with the same parameter types, they are all included in the returned
1775 * array.
1776 *
1777 * <p> See <em>The Java Language Specification</em>, section 8.2.
1778 *
1779 * @return the array of {@code Method} objects representing all the
1780 * declared methods of this class
1781 * @exception SecurityException
1782 * If a security manager, <i>s</i>, is present and any of the
1783 * following conditions is met:
1784 *
1785 * <ul>
1786 *
1787 * <li> invocation of
1788 * {@link SecurityManager#checkMemberAccess
1789 * s.checkMemberAccess(this, Member.DECLARED)} denies
1790 * access to the declared methods within this class
1791 *
1792 * <li> the caller's class loader is not the same as or an
1793 * ancestor of the class loader for the current class and
1794 * invocation of {@link SecurityManager#checkPackageAccess
1795 * s.checkPackageAccess()} denies access to the package
1796 * of this class
1797 *
1798 * </ul>
1799 *
1800 * @since JDK1.1
1801 */
1802 public Method[] getDeclaredMethods() throws SecurityException {
1803 // be very careful not to change the stack depth of this
1804 // checkMemberAccess call for security reasons
1805 // see java.lang.SecurityManager.checkMemberAccess
1806 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1807 return copyMethods(privateGetDeclaredMethods(false));
1808 }
1809
1810
1811 /**
1812 * Returns an array of {@code Constructor} objects reflecting all the
1813 * constructors declared by the class represented by this
1814 * {@code Class} object. These are public, protected, default
1815 * (package) access, and private constructors. The elements in the array
1816 * returned are not sorted and are not in any particular order. If the
1817 * class has a default constructor, it is included in the returned array.
1818 * This method returns an array of length 0 if this {@code Class}
1819 * object represents an interface, a primitive type, an array class, or
1820 * void.
1821 *
1822 * <p> See <em>The Java Language Specification</em>, section 8.2.
1823 *
1824 * @return the array of {@code Constructor} objects representing all the
1825 * declared constructors of this class
1826 * @exception SecurityException
1827 * If a security manager, <i>s</i>, is present and any of the
1828 * following conditions is met:
1829 *
1830 * <ul>
1831 *
1832 * <li> invocation of
1833 * {@link SecurityManager#checkMemberAccess
1834 * s.checkMemberAccess(this, Member.DECLARED)} denies
1835 * access to the declared constructors within this class
1836 *
1837 * <li> the caller's class loader is not the same as or an
1838 * ancestor of the class loader for the current class and
1839 * invocation of {@link SecurityManager#checkPackageAccess
1840 * s.checkPackageAccess()} denies access to the package
1841 * of this class
1842 *
1843 * </ul>
1844 *
1845 * @since JDK1.1
1846 */
1847 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
1848 // be very careful not to change the stack depth of this
1849 // checkMemberAccess call for security reasons
1850 // see java.lang.SecurityManager.checkMemberAccess
1851 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1852 return copyConstructors(privateGetDeclaredConstructors(false));
1853 }
1854
1855
1856 /**
1857 * Returns a {@code Field} object that reflects the specified declared
1858 * field of the class or interface represented by this {@code Class}
1859 * object. The {@code name} parameter is a {@code String} that
1860 * specifies the simple name of the desired field. Note that this method
1861 * will not reflect the {@code length} field of an array class.
1862 *
1863 * @param name the name of the field
1864 * @return the {@code Field} object for the specified field in this
1865 * class
1866 * @exception NoSuchFieldException if a field with the specified name is
1867 * not found.
1868 * @exception NullPointerException if {@code name} is {@code null}
1869 * @exception SecurityException
1870 * If a security manager, <i>s</i>, is present and any of the
1871 * following conditions is met:
1872 *
1873 * <ul>
1874 *
1875 * <li> invocation of
1876 * {@link SecurityManager#checkMemberAccess
1877 * s.checkMemberAccess(this, Member.DECLARED)} denies
1878 * access to the declared field
1879 *
1880 * <li> the caller's class loader is not the same as or an
1881 * ancestor of the class loader for the current class and
1882 * invocation of {@link SecurityManager#checkPackageAccess
1883 * s.checkPackageAccess()} denies access to the package
1884 * of this class
1885 *
1886 * </ul>
1887 *
1888 * @since JDK1.1
1889 */
1890 public Field getDeclaredField(String name)
1891 throws NoSuchFieldException, SecurityException {
1892 // be very careful not to change the stack depth of this
1893 // checkMemberAccess call for security reasons
1894 // see java.lang.SecurityManager.checkMemberAccess
1895 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1896 Field field = searchFields(privateGetDeclaredFields(false), name);
1897 if (field == null) {
1898 throw new NoSuchFieldException(name);
1899 }
1900 return field;
1901 }
1902
1903
1904 /**
1905 * Returns a {@code Method} object that reflects the specified
1906 * declared method of the class or interface represented by this
1907 * {@code Class} object. The {@code name} parameter is a
1908 * {@code String} that specifies the simple name of the desired
1909 * method, and the {@code parameterTypes} parameter is an array of
1910 * {@code Class} objects that identify the method's formal parameter
1911 * types, in declared order. If more than one method with the same
1912 * parameter types is declared in a class, and one of these methods has a
1913 * return type that is more specific than any of the others, that method is
1914 * returned; otherwise one of the methods is chosen arbitrarily. If the
1915 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
1916 * is raised.
1917 *
1918 * @param name the name of the method
1919 * @param parameterTypes the parameter array
1920 * @return the {@code Method} object for the method of this class
1921 * matching the specified name and parameters
1922 * @exception NoSuchMethodException if a matching method is not found.
1923 * @exception NullPointerException if {@code name} is {@code null}
1924 * @exception SecurityException
1925 * If a security manager, <i>s</i>, is present and any of the
1926 * following conditions is met:
1927 *
1928 * <ul>
1929 *
1930 * <li> invocation of
1931 * {@link SecurityManager#checkMemberAccess
1932 * s.checkMemberAccess(this, Member.DECLARED)} denies
1933 * access to the declared method
1934 *
1935 * <li> the caller's class loader is not the same as or an
1936 * ancestor of the class loader for the current class and
1937 * invocation of {@link SecurityManager#checkPackageAccess
1938 * s.checkPackageAccess()} denies access to the package
1939 * of this class
1940 *
1941 * </ul>
1942 *
1943 * @since JDK1.1
1944 */
1945 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
1946 throws NoSuchMethodException, SecurityException {
1947 // be very careful not to change the stack depth of this
1948 // checkMemberAccess call for security reasons
1949 // see java.lang.SecurityManager.checkMemberAccess
1950 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1951 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
1952 if (method == null) {
1953 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1954 }
1955 return method;
1956 }
1957
1958
1959 /**
1960 * Returns a {@code Constructor} object that reflects the specified
1961 * constructor of the class or interface represented by this
1962 * {@code Class} object. The {@code parameterTypes} parameter is
1963 * an array of {@code Class} objects that identify the constructor's
1964 * formal parameter types, in declared order.
1965 *
1966 * If this {@code Class} object represents an inner class
1967 * declared in a non-static context, the formal parameter types
1968 * include the explicit enclosing instance as the first parameter.
1969 *
1970 * @param parameterTypes the parameter array
1971 * @return The {@code Constructor} object for the constructor with the
1972 * specified parameter list
1973 * @exception NoSuchMethodException if a matching method is not found.
1974 * @exception SecurityException
1975 * If a security manager, <i>s</i>, is present and any of the
1976 * following conditions is met:
1977 *
1978 * <ul>
1979 *
1980 * <li> invocation of
1981 * {@link SecurityManager#checkMemberAccess
1982 * s.checkMemberAccess(this, Member.DECLARED)} denies
1983 * access to the declared constructor
1984 *
1985 * <li> the caller's class loader is not the same as or an
1986 * ancestor of the class loader for the current class and
1987 * invocation of {@link SecurityManager#checkPackageAccess
1988 * s.checkPackageAccess()} denies access to the package
1989 * of this class
1990 *
1991 * </ul>
1992 *
1993 * @since JDK1.1
1994 */
1995 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
1996 throws NoSuchMethodException, SecurityException {
1997 // be very careful not to change the stack depth of this
1998 // checkMemberAccess call for security reasons
1999 // see java.lang.SecurityManager.checkMemberAccess
2000 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
2001 return getConstructor0(parameterTypes, Member.DECLARED);
2002 }
2003
2004 /**
2005 * Finds a resource with a given name. The rules for searching resources
2006 * associated with a given class are implemented by the defining
2007 * {@linkplain ClassLoader class loader} of the class. This method
2008 * delegates to this object's class loader. If this object was loaded by
2009 * the bootstrap class loader, the method delegates to {@link
2010 * ClassLoader#getSystemResourceAsStream}.
2011 *
2012 * <p> Before delegation, an absolute resource name is constructed from the
2013 * given resource name using this algorithm:
2014 *
2015 * <ul>
2016 *
2017 * <li> If the {@code name} begins with a {@code '/'}
2018 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2019 * portion of the {@code name} following the {@code '/'}.
2020 *
2021 * <li> Otherwise, the absolute name is of the following form:
2022 *
2023 * <blockquote>
2024 * {@code modified_package_name/name}
2025 * </blockquote>
2026 *
2027 * <p> Where the {@code modified_package_name} is the package name of this
2028 * object with {@code '/'} substituted for {@code '.'}
2029 * (<tt>'\u002e'</tt>).
2030 *
2031 * </ul>
2032 *
2033 * @param name name of the desired resource
2034 * @return A {@link java.io.InputStream} object or {@code null} if
2035 * no resource with this name is found
2036 * @throws NullPointerException If {@code name} is {@code null}
2037 * @since JDK1.1
2038 */
2039 public InputStream getResourceAsStream(String name) {
2040 name = resolveName(name);
2041 ClassLoader cl = getClassLoader0();
2042 if (cl==null) {
2043 // A system class.
2044 return ClassLoader.getSystemResourceAsStream(name);
2045 }
2046 return cl.getResourceAsStream(name);
2047 }
2048
2049 /**
2050 * Finds a resource with a given name. The rules for searching resources
2051 * associated with a given class are implemented by the defining
2052 * {@linkplain ClassLoader class loader} of the class. This method
2053 * delegates to this object's class loader. If this object was loaded by
2054 * the bootstrap class loader, the method delegates to {@link
2055 * ClassLoader#getSystemResource}.
2056 *
2057 * <p> Before delegation, an absolute resource name is constructed from the
2058 * given resource name using this algorithm:
2059 *
2060 * <ul>
2061 *
2062 * <li> If the {@code name} begins with a {@code '/'}
2063 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2064 * portion of the {@code name} following the {@code '/'}.
2065 *
2066 * <li> Otherwise, the absolute name is of the following form:
2067 *
2068 * <blockquote>
2069 * {@code modified_package_name/name}
2070 * </blockquote>
2071 *
2072 * <p> Where the {@code modified_package_name} is the package name of this
2073 * object with {@code '/'} substituted for {@code '.'}
2074 * (<tt>'\u002e'</tt>).
2075 *
2076 * </ul>
2077 *
2078 * @param name name of the desired resource
2079 * @return A {@link java.net.URL} object or {@code null} if no
2080 * resource with this name is found
2081 * @since JDK1.1
2082 */
2083 public java.net.URL getResource(String name) {
2084 name = resolveName(name);
2085 ClassLoader cl = getClassLoader0();
2086 if (cl==null) {
2087 // A system class.
2088 return ClassLoader.getSystemResource(name);
2089 }
2090 return cl.getResource(name);
2091 }
2092
2093
2094
2095 /** protection domain returned when the internal domain is null */
2096 private static java.security.ProtectionDomain allPermDomain;
2097
2098
2099 /**
2100 * Returns the {@code ProtectionDomain} of this class. If there is a
2101 * security manager installed, this method first calls the security
2102 * manager's {@code checkPermission} method with a
2103 * {@code RuntimePermission("getProtectionDomain")} permission to
2104 * ensure it's ok to get the
2105 * {@code ProtectionDomain}.
2106 *
2107 * @return the ProtectionDomain of this class
2108 *
2109 * @throws SecurityException
2110 * if a security manager exists and its
2111 * {@code checkPermission} method doesn't allow
2112 * getting the ProtectionDomain.
2113 *
2114 * @see java.security.ProtectionDomain
2115 * @see SecurityManager#checkPermission
2116 * @see java.lang.RuntimePermission
2117 * @since 1.2
2118 */
2119 public java.security.ProtectionDomain getProtectionDomain() {
2120 SecurityManager sm = System.getSecurityManager();
2121 if (sm != null) {
2122 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2123 }
2124 java.security.ProtectionDomain pd = getProtectionDomain0();
2125 if (pd == null) {
2126 if (allPermDomain == null) {
2127 java.security.Permissions perms =
2128 new java.security.Permissions();
2129 perms.add(SecurityConstants.ALL_PERMISSION);
2130 allPermDomain =
2131 new java.security.ProtectionDomain(null, perms);
2132 }
2133 pd = allPermDomain;
2134 }
2135 return pd;
2136 }
2137
2138
2139 /**
2140 * Returns the ProtectionDomain of this class.
2141 */
2142 private native java.security.ProtectionDomain getProtectionDomain0();
2143
2144
2145 /**
2146 * Set the ProtectionDomain for this class. Called by
2147 * ClassLoader.defineClass.
2148 */
2149 native void setProtectionDomain0(java.security.ProtectionDomain pd);
2150
2151
2152 /*
2153 * Return the Virtual Machine's Class object for the named
2154 * primitive type.
2155 */
2156 static native Class<?> getPrimitiveClass(String name);
2157
2158
2159 /*
2160 * Check if client is allowed to access members. If access is denied,
2161 * throw a SecurityException.
2162 *
2163 * Be very careful not to change the stack depth of this checkMemberAccess
2164 * call for security reasons.
2165 * See java.lang.SecurityManager.checkMemberAccess.
2166 *
2167 * <p> Default policy: allow all clients access with normal Java access
2168 * control.
2169 */
2170 private void checkMemberAccess(int which, ClassLoader ccl) {
2171 SecurityManager s = System.getSecurityManager();
2172 if (s != null) {
2173 s.checkMemberAccess(this, which);
2174 ClassLoader cl = getClassLoader0();
2175 if (sun.reflect.misc.ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2176 String name = this.getName();
2177 int i = name.lastIndexOf('.');
2178 if (i != -1) {
2179 s.checkPackageAccess(name.substring(0, i));
2180 }
2181 }
2182 }
2183 }
2184
2185 /**
2186 * Add a package name prefix if the name is not absolute Remove leading "/"
2187 * if name is absolute
2188 */
2189 private String resolveName(String name) {
2190 if (name == null) {
2191 return name;
2192 }
2193 if (!name.startsWith("/")) {
2194 Class<?> c = this;
2195 while (c.isArray()) {
2196 c = c.getComponentType();
2197 }
2198 String baseName = c.getName();
2199 int index = baseName.lastIndexOf('.');
2200 if (index != -1) {
2201 name = baseName.substring(0, index).replace('.', '/')
2202 +"/"+name;
2203 }
2204 } else {
2205 name = name.substring(1);
2206 }
2207 return name;
2208 }
2209
2210 /**
2211 * Reflection support.
2212 */
2213
2214 // Caches for certain reflective results
2215 private static boolean useCaches = true;
2216 private volatile transient SoftReference<Field[]> declaredFields;
2217 private volatile transient SoftReference<Field[]> publicFields;
2218 private volatile transient SoftReference<Method[]> declaredMethods;
2219 private volatile transient SoftReference<Method[]> publicMethods;
2220 private volatile transient SoftReference<Constructor<T>[]> declaredConstructors;
2221 private volatile transient SoftReference<Constructor<T>[]> publicConstructors;
2222 // Intermediate results for getFields and getMethods
2223 private volatile transient SoftReference<Field[]> declaredPublicFields;
2224 private volatile transient SoftReference<Method[]> declaredPublicMethods;
2225
2226 // Incremented by the VM on each call to JVM TI RedefineClasses()
2227 // that redefines this class or a superclass.
2228 private volatile transient int classRedefinedCount = 0;
2229
2230 // Value of classRedefinedCount when we last cleared the cached values
2231 // that are sensitive to class redefinition.
2232 private volatile transient int lastRedefinedCount = 0;
2233
2234 // Clears cached values that might possibly have been obsoleted by
2235 // a class redefinition.
2236 private void clearCachesOnClassRedefinition() {
2237 if (lastRedefinedCount != classRedefinedCount) {
2238 declaredFields = publicFields = declaredPublicFields = null;
2239 declaredMethods = publicMethods = declaredPublicMethods = null;
2240 declaredConstructors = publicConstructors = null;
2241 annotations = declaredAnnotations = null;
2242
2243 // Use of "volatile" (and synchronization by caller in the case
2244 // of annotations) ensures that no thread sees the update to
2245 // lastRedefinedCount before seeing the caches cleared.
2246 // We do not guard against brief windows during which multiple
2247 // threads might redundantly work to fill an empty cache.
2248 lastRedefinedCount = classRedefinedCount;
2249 }
2250 }
2251
2252 // Generic signature handling
2253 private native String getGenericSignature();
2254
2255 // Generic info repository; lazily initialized
2256 private transient ClassRepository genericInfo;
2257
2258 // accessor for factory
2259 private GenericsFactory getFactory() {
2260 // create scope and factory
2261 return CoreReflectionFactory.make(this, ClassScope.make(this));
2262 }
2263
2264 // accessor for generic info repository
2265 private ClassRepository getGenericInfo() {
2266 // lazily initialize repository if necessary
2267 if (genericInfo == null) {
2268 // create and cache generic info repository
2269 genericInfo = ClassRepository.make(getGenericSignature(),
2270 getFactory());
2271 }
2272 return genericInfo; //return cached repository
2273 }
2274
2275 // Annotations handling
2276 private native byte[] getRawAnnotations();
2277
2278 native ConstantPool getConstantPool();
2279
2280 //
2281 //
2282 // java.lang.reflect.Field handling
2283 //
2284 //
2285
2286 // Returns an array of "root" fields. These Field objects must NOT
2287 // be propagated to the outside world, but must instead be copied
2288 // via ReflectionFactory.copyField.
2289 private Field[] privateGetDeclaredFields(boolean publicOnly) {
2290 checkInitted();
2291 Field[] res = null;
2292 if (useCaches) {
2293 clearCachesOnClassRedefinition();
2294 if (publicOnly) {
2295 if (declaredPublicFields != null) {
2296 res = declaredPublicFields.get();
2297 }
2298 } else {
2299 if (declaredFields != null) {
2300 res = declaredFields.get();
2301 }
2302 }
2303 if (res != null) return res;
2304 }
2305 // No cached value available; request value from VM
2306 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
2307 if (useCaches) {
2308 if (publicOnly) {
2309 declaredPublicFields = new SoftReference<>(res);
2310 } else {
2311 declaredFields = new SoftReference<>(res);
2312 }
2313 }
2314 return res;
2315 }
2316
2317 // Returns an array of "root" fields. These Field objects must NOT
2318 // be propagated to the outside world, but must instead be copied
2319 // via ReflectionFactory.copyField.
2320 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) {
2321 checkInitted();
2322 Field[] res = null;
2323 if (useCaches) {
2324 clearCachesOnClassRedefinition();
2325 if (publicFields != null) {
2326 res = publicFields.get();
2327 }
2328 if (res != null) return res;
2329 }
2330
2331 // No cached value available; compute value recursively.
2332 // Traverse in correct order for getField().
2333 List<Field> fields = new ArrayList<>();
2334 if (traversedInterfaces == null) {
2335 traversedInterfaces = new HashSet<>();
2336 }
2337
2338 // Local fields
2339 Field[] tmp = privateGetDeclaredFields(true);
2340 addAll(fields, tmp);
2341
2342 // Direct superinterfaces, recursively
2343 for (Class<?> c : getInterfaces()) {
2344 if (!traversedInterfaces.contains(c)) {
2345 traversedInterfaces.add(c);
2346 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2347 }
2348 }
2349
2350 // Direct superclass, recursively
2351 if (!isInterface()) {
2352 Class<?> c = getSuperclass();
2353 if (c != null) {
2354 addAll(fields, c.privateGetPublicFields(traversedInterfaces));
2355 }
2356 }
2357
2358 res = new Field[fields.size()];
2359 fields.toArray(res);
2360 if (useCaches) {
2361 publicFields = new SoftReference<>(res);
2362 }
2363 return res;
2364 }
2365
2366 private static void addAll(Collection<Field> c, Field[] o) {
2367 for (int i = 0; i < o.length; i++) {
2368 c.add(o[i]);
2369 }
2370 }
2371
2372
2373 //
2374 //
2375 // java.lang.reflect.Constructor handling
2376 //
2377 //
2378
2379 // Returns an array of "root" constructors. These Constructor
2380 // objects must NOT be propagated to the outside world, but must
2381 // instead be copied via ReflectionFactory.copyConstructor.
2382 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
2383 checkInitted();
2384 Constructor<T>[] res = null;
2385 if (useCaches) {
2386 clearCachesOnClassRedefinition();
2387 if (publicOnly) {
2388 if (publicConstructors != null) {
2389 res = publicConstructors.get();
2390 }
2391 } else {
2392 if (declaredConstructors != null) {
2393 res = declaredConstructors.get();
2394 }
2395 }
2396 if (res != null) return res;
2397 }
2398 // No cached value available; request value from VM
2399 if (isInterface()) {
2400 @SuppressWarnings("unchecked")
2401 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
2402 res = temporaryRes;
2403 } else {
2404 res = getDeclaredConstructors0(publicOnly);
2405 }
2406 if (useCaches) {
2407 if (publicOnly) {
2408 publicConstructors = new SoftReference<>(res);
2409 } else {
2410 declaredConstructors = new SoftReference<>(res);
2411 }
2412 }
2413 return res;
2414 }
2415
2416 //
2417 //
2418 // java.lang.reflect.Method handling
2419 //
2420 //
2421
2422 // Returns an array of "root" methods. These Method objects must NOT
2423 // be propagated to the outside world, but must instead be copied
2424 // via ReflectionFactory.copyMethod.
2425 private Method[] privateGetDeclaredMethods(boolean publicOnly) {
2426 checkInitted();
2427 Method[] res = null;
2428 if (useCaches) {
2429 clearCachesOnClassRedefinition();
2430 if (publicOnly) {
2431 if (declaredPublicMethods != null) {
2432 res = declaredPublicMethods.get();
2433 }
2434 } else {
2435 if (declaredMethods != null) {
2436 res = declaredMethods.get();
2437 }
2438 }
2439 if (res != null) return res;
2440 }
2441 // No cached value available; request value from VM
2442 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
2443 if (useCaches) {
2444 if (publicOnly) {
2445 declaredPublicMethods = new SoftReference<>(res);
2446 } else {
2447 declaredMethods = new SoftReference<>(res);
2448 }
2449 }
2450 return res;
2451 }
2452
2453 static class MethodArray {
2454 private Method[] methods;
2455 private int length;
2456
2457 MethodArray() {
2458 methods = new Method[20];
2459 length = 0;
2460 }
2461
2462 void add(Method m) {
2463 if (length == methods.length) {
2464 methods = Arrays.copyOf(methods, 2 * methods.length);
2465 }
2466 methods[length++] = m;
2467 }
2468
2469 void addAll(Method[] ma) {
2470 for (int i = 0; i < ma.length; i++) {
2471 add(ma[i]);
2472 }
2473 }
2474
2475 void addAll(MethodArray ma) {
2476 for (int i = 0; i < ma.length(); i++) {
2477 add(ma.get(i));
2478 }
2479 }
2480
2481 void addIfNotPresent(Method newMethod) {
2482 for (int i = 0; i < length; i++) {
2483 Method m = methods[i];
2484 if (m == newMethod || (m != null && m.equals(newMethod))) {
2485 return;
2486 }
2487 }
2488 add(newMethod);
2489 }
2490
2491 void addAllIfNotPresent(MethodArray newMethods) {
2492 for (int i = 0; i < newMethods.length(); i++) {
2493 Method m = newMethods.get(i);
2494 if (m != null) {
2495 addIfNotPresent(m);
2496 }
2497 }
2498 }
2499
2500 int length() {
2501 return length;
2502 }
2503
2504 Method get(int i) {
2505 return methods[i];
2506 }
2507
2508 void removeByNameAndSignature(Method toRemove) {
2509 for (int i = 0; i < length; i++) {
2510 Method m = methods[i];
2511 if (m != null &&
2512 m.getReturnType() == toRemove.getReturnType() &&
2513 m.getName() == toRemove.getName() &&
2514 arrayContentsEq(m.getParameterTypes(),
2515 toRemove.getParameterTypes())) {
2516 methods[i] = null;
2517 }
2518 }
2519 }
2520
2521 void compactAndTrim() {
2522 int newPos = 0;
2523 // Get rid of null slots
2524 for (int pos = 0; pos < length; pos++) {
2525 Method m = methods[pos];
2526 if (m != null) {
2527 if (pos != newPos) {
2528 methods[newPos] = m;
2529 }
2530 newPos++;
2531 }
2532 }
2533 if (newPos != methods.length) {
2534 methods = Arrays.copyOf(methods, newPos);
2535 }
2536 }
2537
2538 Method[] getArray() {
2539 return methods;
2540 }
2541 }
2542
2543
2544 // Returns an array of "root" methods. These Method objects must NOT
2545 // be propagated to the outside world, but must instead be copied
2546 // via ReflectionFactory.copyMethod.
2547 private Method[] privateGetPublicMethods() {
2548 checkInitted();
2549 Method[] res = null;
2550 if (useCaches) {
2551 clearCachesOnClassRedefinition();
2552 if (publicMethods != null) {
2553 res = publicMethods.get();
2554 }
2555 if (res != null) return res;
2556 }
2557
2558 // No cached value available; compute value recursively.
2559 // Start by fetching public declared methods
2560 MethodArray methods = new MethodArray();
2561 {
2562 Method[] tmp = privateGetDeclaredMethods(true);
2563 methods.addAll(tmp);
2564 }
2565 // Now recur over superclass and direct superinterfaces.
2566 // Go over superinterfaces first so we can more easily filter
2567 // out concrete implementations inherited from superclasses at
2568 // the end.
2569 MethodArray inheritedMethods = new MethodArray();
2570 Class<?>[] interfaces = getInterfaces();
2571 for (int i = 0; i < interfaces.length; i++) {
2572 inheritedMethods.addAll(interfaces[i].privateGetPublicMethods());
2573 }
2574 if (!isInterface()) {
2575 Class<?> c = getSuperclass();
2576 if (c != null) {
2577 MethodArray supers = new MethodArray();
2578 supers.addAll(c.privateGetPublicMethods());
2579 // Filter out concrete implementations of any
2580 // interface methods
2581 for (int i = 0; i < supers.length(); i++) {
2582 Method m = supers.get(i);
2583 if (m != null && !Modifier.isAbstract(m.getModifiers())) {
2584 inheritedMethods.removeByNameAndSignature(m);
2585 }
2586 }
2587 // Insert superclass's inherited methods before
2588 // superinterfaces' to satisfy getMethod's search
2589 // order
2590 supers.addAll(inheritedMethods);
2591 inheritedMethods = supers;
2592 }
2593 }
2594 // Filter out all local methods from inherited ones
2595 for (int i = 0; i < methods.length(); i++) {
2596 Method m = methods.get(i);
2597 inheritedMethods.removeByNameAndSignature(m);
2598 }
2599 methods.addAllIfNotPresent(inheritedMethods);
2600 methods.compactAndTrim();
2601 res = methods.getArray();
2602 if (useCaches) {
2603 publicMethods = new SoftReference<>(res);
2604 }
2605 return res;
2606 }
2607
2608
2609 //
2610 // Helpers for fetchers of one field, method, or constructor
2611 //
2612
2613 private Field searchFields(Field[] fields, String name) {
2614 String internedName = name.intern();
2615 for (int i = 0; i < fields.length; i++) {
2616 if (fields[i].getName() == internedName) {
2617 return getReflectionFactory().copyField(fields[i]);
2618 }
2619 }
2620 return null;
2621 }
2622
2623 private Field getField0(String name) throws NoSuchFieldException {
2624 // Note: the intent is that the search algorithm this routine
2625 // uses be equivalent to the ordering imposed by
2626 // privateGetPublicFields(). It fetches only the declared
2627 // public fields for each class, however, to reduce the number
2628 // of Field objects which have to be created for the common
2629 // case where the field being requested is declared in the
2630 // class which is being queried.
2631 Field res = null;
2632 // Search declared public fields
2633 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
2634 return res;
2635 }
2636 // Direct superinterfaces, recursively
2637 Class<?>[] interfaces = getInterfaces();
2638 for (int i = 0; i < interfaces.length; i++) {
2639 Class<?> c = interfaces[i];
2640 if ((res = c.getField0(name)) != null) {
2641 return res;
2642 }
2643 }
2644 // Direct superclass, recursively
2645 if (!isInterface()) {
2646 Class<?> c = getSuperclass();
2647 if (c != null) {
2648 if ((res = c.getField0(name)) != null) {
2649 return res;
2650 }
2651 }
2652 }
2653 return null;
2654 }
2655
2656 private static Method searchMethods(Method[] methods,
2657 String name,
2658 Class<?>[] parameterTypes)
2659 {
2660 Method res = null;
2661 String internedName = name.intern();
2662 for (int i = 0; i < methods.length; i++) {
2663 Method m = methods[i];
2664 if (m.getName() == internedName
2665 && arrayContentsEq(parameterTypes, m.getParameterTypes())
2666 && (res == null
2667 || res.getReturnType().isAssignableFrom(m.getReturnType())))
2668 res = m;
2669 }
2670
2671 return (res == null ? res : getReflectionFactory().copyMethod(res));
2672 }
2673
2674
2675 private Method getMethod0(String name, Class<?>[] parameterTypes) {
2676 // Note: the intent is that the search algorithm this routine
2677 // uses be equivalent to the ordering imposed by
2678 // privateGetPublicMethods(). It fetches only the declared
2679 // public methods for each class, however, to reduce the
2680 // number of Method objects which have to be created for the
2681 // common case where the method being requested is declared in
2682 // the class which is being queried.
2683 Method res = null;
2684 // Search declared public methods
2685 if ((res = searchMethods(privateGetDeclaredMethods(true),
2686 name,
2687 parameterTypes)) != null) {
2688 return res;
2689 }
2690 // Search superclass's methods
2691 if (!isInterface()) {
2692 Class<? super T> c = getSuperclass();
2693 if (c != null) {
2694 if ((res = c.getMethod0(name, parameterTypes)) != null) {
2695 return res;
2696 }
2697 }
2698 }
2699 // Search superinterfaces' methods
2700 Class<?>[] interfaces = getInterfaces();
2701 for (int i = 0; i < interfaces.length; i++) {
2702 Class<?> c = interfaces[i];
2703 if ((res = c.getMethod0(name, parameterTypes)) != null) {
2704 return res;
2705 }
2706 }
2707 // Not found
2708 return null;
2709 }
2710
2711 private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
2712 int which) throws NoSuchMethodException
2713 {
2714 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
2715 for (Constructor<T> constructor : constructors) {
2716 if (arrayContentsEq(parameterTypes,
2717 constructor.getParameterTypes())) {
2718 return getReflectionFactory().copyConstructor(constructor);
2719 }
2720 }
2721 throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes));
2722 }
2723
2724 //
2725 // Other helpers and base implementation
2726 //
2727
2728 private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
2729 if (a1 == null) {
2730 return a2 == null || a2.length == 0;
2731 }
2732
2733 if (a2 == null) {
2734 return a1.length == 0;
2735 }
2736
2737 if (a1.length != a2.length) {
2738 return false;
2739 }
2740
2741 for (int i = 0; i < a1.length; i++) {
2742 if (a1[i] != a2[i]) {
2743 return false;
2744 }
2745 }
2746
2747 return true;
2748 }
2749
2750 private static Field[] copyFields(Field[] arg) {
2751 Field[] out = new Field[arg.length];
2752 ReflectionFactory fact = getReflectionFactory();
2753 for (int i = 0; i < arg.length; i++) {
2754 out[i] = fact.copyField(arg[i]);
2755 }
2756 return out;
2757 }
2758
2759 private static Method[] copyMethods(Method[] arg) {
2760 Method[] out = new Method[arg.length];
2761 ReflectionFactory fact = getReflectionFactory();
2762 for (int i = 0; i < arg.length; i++) {
2763 out[i] = fact.copyMethod(arg[i]);
2764 }
2765 return out;
2766 }
2767
2768 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
2769 Constructor<U>[] out = arg.clone();
2770 ReflectionFactory fact = getReflectionFactory();
2771 for (int i = 0; i < out.length; i++) {
2772 out[i] = fact.copyConstructor(out[i]);
2773 }
2774 return out;
2775 }
2776
2777 private native Field[] getDeclaredFields0(boolean publicOnly);
2778 private native Method[] getDeclaredMethods0(boolean publicOnly);
2779 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
2780 private native Class<?>[] getDeclaredClasses0();
2781
2782 private static String argumentTypesToString(Class<?>[] argTypes) {
2783 StringBuilder buf = new StringBuilder();
2784 buf.append("(");
2785 if (argTypes != null) {
2786 for (int i = 0; i < argTypes.length; i++) {
2787 if (i > 0) {
2788 buf.append(", ");
2789 }
2790 Class<?> c = argTypes[i];
2791 buf.append((c == null) ? "null" : c.getName());
2792 }
2793 }
2794 buf.append(")");
2795 return buf.toString();
2796 }
2797
2798 /** use serialVersionUID from JDK 1.1 for interoperability */
2799 private static final long serialVersionUID = 3206093459760846163L;
2800
2801
2802 /**
2803 * Class Class is special cased within the Serialization Stream Protocol.
2804 *
2805 * A Class instance is written initially into an ObjectOutputStream in the
2806 * following format:
2807 * <pre>
2808 * {@code TC_CLASS} ClassDescriptor
2809 * A ClassDescriptor is a special cased serialization of
2810 * a {@code java.io.ObjectStreamClass} instance.
2811 * </pre>
2812 * A new handle is generated for the initial time the class descriptor
2813 * is written into the stream. Future references to the class descriptor
2814 * are written as references to the initial class descriptor instance.
2815 *
2816 * @see java.io.ObjectStreamClass
2817 */
2818 private static final ObjectStreamField[] serialPersistentFields =
2819 new ObjectStreamField[0];
2820
2821
2822 /**
2823 * Returns the assertion status that would be assigned to this
2824 * class if it were to be initialized at the time this method is invoked.
2825 * If this class has had its assertion status set, the most recent
2826 * setting will be returned; otherwise, if any package default assertion
2827 * status pertains to this class, the most recent setting for the most
2828 * specific pertinent package default assertion status is returned;
2829 * otherwise, if this class is not a system class (i.e., it has a
2830 * class loader) its class loader's default assertion status is returned;
2831 * otherwise, the system class default assertion status is returned.
2832 * <p>
2833 * Few programmers will have any need for this method; it is provided
2834 * for the benefit of the JRE itself. (It allows a class to determine at
2835 * the time that it is initialized whether assertions should be enabled.)
2836 * Note that this method is not guaranteed to return the actual
2837 * assertion status that was (or will be) associated with the specified
2838 * class when it was (or will be) initialized.
2839 *
2840 * @return the desired assertion status of the specified class.
2841 * @see java.lang.ClassLoader#setClassAssertionStatus
2842 * @see java.lang.ClassLoader#setPackageAssertionStatus
2843 * @see java.lang.ClassLoader#setDefaultAssertionStatus
2844 * @since 1.4
2845 */
2846 public boolean desiredAssertionStatus() {
2847 ClassLoader loader = getClassLoader();
2848 // If the loader is null this is a system class, so ask the VM
2849 if (loader == null)
2850 return desiredAssertionStatus0(this);
2851
2852 // If the classloader has been initialized with the assertion
2853 // directives, ask it. Otherwise, ask the VM.
2854 synchronized(loader.assertionLock) {
2855 if (loader.classAssertionStatus != null) {
2856 return loader.desiredAssertionStatus(getName());
2857 }
2858 }
2859 return desiredAssertionStatus0(this);
2860 }
2861
2862 // Retrieves the desired assertion status of this class from the VM
2863 private static native boolean desiredAssertionStatus0(Class<?> clazz);
2864
2865 /**
2866 * Returns true if and only if this class was declared as an enum in the
2867 * source code.
2868 *
2869 * @return true if and only if this class was declared as an enum in the
2870 * source code
2871 * @since 1.5
2872 */
2873 public boolean isEnum() {
2874 // An enum must both directly extend java.lang.Enum and have
2875 // the ENUM bit set; classes for specialized enum constants
2876 // don't do the former.
2877 return (this.getModifiers() & ENUM) != 0 &&
2878 this.getSuperclass() == java.lang.Enum.class;
2879 }
2880
2881 // Fetches the factory for reflective objects
2882 private static ReflectionFactory getReflectionFactory() {
2883 if (reflectionFactory == null) {
2884 reflectionFactory =
2885 java.security.AccessController.doPrivileged
2886 (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction());
2887 }
2888 return reflectionFactory;
2889 }
2890 private static ReflectionFactory reflectionFactory;
2891
2892 // To be able to query system properties as soon as they're available
2893 private static boolean initted = false;
2894 private static void checkInitted() {
2895 if (initted) return;
2896 AccessController.doPrivileged(new PrivilegedAction<Void>() {
2897 public Void run() {
2898 // Tests to ensure the system properties table is fully
2899 // initialized. This is needed because reflection code is
2900 // called very early in the initialization process (before
2901 // command-line arguments have been parsed and therefore
2902 // these user-settable properties installed.) We assume that
2903 // if System.out is non-null then the System class has been
2904 // fully initialized and that the bulk of the startup code
2905 // has been run.
2906
2907 if (System.out == null) {
2908 // java.lang.System not yet fully initialized
2909 return null;
2910 }
2911
2912 // Doesn't use Boolean.getBoolean to avoid class init.
2913 String val =
2914 System.getProperty("sun.reflect.noCaches");
2915 if (val != null && val.equals("true")) {
2916 useCaches = false;
2917 }
2918
2919 initted = true;
2920 return null;
2921 }
2922 });
2923 }
2924
2925 /**
2926 * Returns the elements of this enum class or null if this
2927 * Class object does not represent an enum type.
2928 *
2929 * @return an array containing the values comprising the enum class
2930 * represented by this Class object in the order they're
2931 * declared, or null if this Class object does not
2932 * represent an enum type
2933 * @since 1.5
2934 */
2935 public T[] getEnumConstants() {
2936 T[] values = getEnumConstantsShared();
2937 return (values != null) ? values.clone() : null;
2938 }
2939
2940 /**
2941 * Returns the elements of this enum class or null if this
2942 * Class object does not represent an enum type;
2943 * identical to getEnumConstants except that the result is
2944 * uncloned, cached, and shared by all callers.
2945 */
2946 T[] getEnumConstantsShared() {
2947 if (enumConstants == null) {
2948 if (!isEnum()) return null;
2949 try {
2950 final Method values = getMethod("values");
2951 java.security.AccessController.doPrivileged(
2952 new java.security.PrivilegedAction<Void>() {
2953 public Void run() {
2954 values.setAccessible(true);
2955 return null;
2956 }
2957 });
2958 @SuppressWarnings("unchecked")
2959 T[] temporaryConstants = (T[])values.invoke(null);
2960 enumConstants = temporaryConstants;
2961 }
2962 // These can happen when users concoct enum-like classes
2963 // that don't comply with the enum spec.
2964 catch (InvocationTargetException | NoSuchMethodException |
2965 IllegalAccessException ex) { return null; }
2966 }
2967 return enumConstants;
2968 }
2969 private volatile transient T[] enumConstants = null;
2970
2971 /**
2972 * Returns a map from simple name to enum constant. This package-private
2973 * method is used internally by Enum to implement
2974 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
2975 * efficiently. Note that the map is returned by this method is
2976 * created lazily on first use. Typically it won't ever get created.
2977 */
2978 Map<String, T> enumConstantDirectory() {
2979 if (enumConstantDirectory == null) {
2980 T[] universe = getEnumConstantsShared();
2981 if (universe == null)
2982 throw new IllegalArgumentException(
2983 getName() + " is not an enum type");
2984 Map<String, T> m = new HashMap<>(2 * universe.length);
2985 for (T constant : universe)
2986 m.put(((Enum<?>)constant).name(), constant);
2987 enumConstantDirectory = m;
2988 }
2989 return enumConstantDirectory;
2990 }
2991 private volatile transient Map<String, T> enumConstantDirectory = null;
2992
2993 /**
2994 * Casts an object to the class or interface represented
2995 * by this {@code Class} object.
2996 *
2997 * @param obj the object to be cast
2998 * @return the object after casting, or null if obj is null
2999 *
3000 * @throws ClassCastException if the object is not
3001 * null and is not assignable to the type T.
3002 *
3003 * @since 1.5
3004 */
3005 @SuppressWarnings("unchecked")
3006 public T cast(Object obj) {
3007 if (obj != null && !isInstance(obj))
3008 throw new ClassCastException(cannotCastMsg(obj));
3009 return (T) obj;
3010 }
3011
3012 private String cannotCastMsg(Object obj) {
3013 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3014 }
3015
3016 /**
3017 * Casts this {@code Class} object to represent a subclass of the class
3018 * represented by the specified class object. Checks that the cast
3019 * is valid, and throws a {@code ClassCastException} if it is not. If
3020 * this method succeeds, it always returns a reference to this class object.
3021 *
3022 * <p>This method is useful when a client needs to "narrow" the type of
3023 * a {@code Class} object to pass it to an API that restricts the
3024 * {@code Class} objects that it is willing to accept. A cast would
3025 * generate a compile-time warning, as the correctness of the cast
3026 * could not be checked at runtime (because generic types are implemented
3027 * by erasure).
3028 *
3029 * @return this {@code Class} object, cast to represent a subclass of
3030 * the specified class object.
3031 * @throws ClassCastException if this {@code Class} object does not
3032 * represent a subclass of the specified class (here "subclass" includes
3033 * the class itself).
3034 * @since 1.5
3035 */
3036 @SuppressWarnings("unchecked")
3037 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3038 if (clazz.isAssignableFrom(this))
3039 return (Class<? extends U>) this;
3040 else
3041 throw new ClassCastException(this.toString());
3042 }
3043
3044 /**
3045 * @throws NullPointerException {@inheritDoc}
3046 * @since 1.5
3047 */
3048 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3049 Objects.requireNonNull(annotationClass);
3050
3051 initAnnotationsIfNecessary();
3052 return AnnotationSupport.getOneAnnotation(annotations, annotationClass);
3053 }
3054
3055 /**
3056 * @throws NullPointerException {@inheritDoc}
3057 * @since 1.5
3058 */
3059 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3060 Objects.requireNonNull(annotationClass);
3061
3062 return getAnnotation(annotationClass) != null;
3063 }
3064
3065 /**
3066 * @throws NullPointerException {@inheritDoc}
3067 * @since 1.8
3068 */
3069 public <A extends Annotation> A[] getAnnotations(Class<A> annotationClass) {
3070 Objects.requireNonNull(annotationClass);
3071
3072 initAnnotationsIfNecessary();
3073 return AnnotationSupport.getMultipleAnnotations(annotations, annotationClass);
3074 }
3075
3076 /**
3077 * @since 1.5
3078 */
3079 public Annotation[] getAnnotations() {
3080 initAnnotationsIfNecessary();
3081 return AnnotationSupport.unpackToArray(annotations);
3082 }
3083
3084 /**
3085 * @throws NullPointerException {@inheritDoc}
3086 * @since 1.8
3087 */
3088 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3089 Objects.requireNonNull(annotationClass);
3090
3091 initAnnotationsIfNecessary();
3092 return AnnotationSupport.getOneAnnotation(declaredAnnotations, annotationClass);
3093 }
3094
3095 /**
3096 * @throws NullPointerException {@inheritDoc}
3097 * @since 1.8
3098 */
3099 public <A extends Annotation> A[] getDeclaredAnnotations(Class<A> annotationClass) {
3100 Objects.requireNonNull(annotationClass);
3101
3102 initAnnotationsIfNecessary();
3103 return AnnotationSupport.getMultipleAnnotations(declaredAnnotations, annotationClass);
3104 }
3105
3106 /**
3107 * @since 1.5
3108 */
3109 public Annotation[] getDeclaredAnnotations() {
3110 initAnnotationsIfNecessary();
3111 return AnnotationSupport.unpackToArray(declaredAnnotations);
3112 }
3113
3114 /** Returns one "directly" present annotation or null */
3115 <A extends Annotation> A getDirectDeclaredAnnotation(Class<A> annotationClass) {
3116 Objects.requireNonNull(annotationClass);
3117
3118 initAnnotationsIfNecessary();
3119 @SuppressWarnings("unchecked") // TODO check safe
3120 A ret = (A)declaredAnnotations.get(annotationClass);
3121 return ret;
3122 }
3123
3124 // Annotations cache
3125 private transient Map<Class<? extends Annotation>, Annotation> annotations;
3126 private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3127
3128 private synchronized void initAnnotationsIfNecessary() {
3129 clearCachesOnClassRedefinition();
3130 if (annotations != null)
3131 return;
3132 declaredAnnotations = AnnotationParser.parseAnnotations(
3133 getRawAnnotations(), getConstantPool(), this);
3134 Class<?> superClass = getSuperclass();
3135 if (superClass == null) {
3136 annotations = declaredAnnotations;
3137 } else {
3138 annotations = new HashMap<>();
3139 superClass.initAnnotationsIfNecessary();
3140 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superClass.annotations.entrySet()) {
3141 Class<? extends Annotation> annotationClass = e.getKey();
3142 if (AnnotationType.getInstance(annotationClass).isInherited())
3143 annotations.put(annotationClass, e.getValue());
3144 }
3145 annotations.putAll(declaredAnnotations);
3146 }
3147 }
3148
3149 // Annotation types cache their internal (AnnotationType) form
3150
3151 private AnnotationType annotationType;
3152
3153 void setAnnotationType(AnnotationType type) {
3154 annotationType = type;
3155 }
3156
3157 AnnotationType getAnnotationType() {
3158 return annotationType;
3159 }
3160
3161 /* Backing store of user-defined values pertaining to this class.
3162 * Maintained by the ClassValue class.
3163 */
3164 transient ClassValue.ClassValueMap classValueMap;
3165 }