1 /*
2 * Copyright 1994-2006 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any 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.GenericDeclaration;
35 import java.lang.reflect.Modifier;
36 import java.lang.reflect.Type;
37 import java.lang.reflect.TypeVariable;
38 import java.lang.reflect.InvocationTargetException;
39 import java.lang.ref.SoftReference;
40 import java.io.InputStream;
41 import java.io.ObjectStreamField;
42 import java.security.AccessController;
43 import java.security.PrivilegedAction;
44 import java.util.ArrayList;
45 import java.util.Arrays;
46 import java.util.Collection;
47 import java.util.HashSet;
48 import java.util.Iterator;
49 import java.util.List;
50 import java.util.LinkedList;
51 import java.util.LinkedHashSet;
52 import java.util.Set;
53 import java.util.Map;
54 import java.util.HashMap;
55 import sun.misc.Unsafe;
56 import sun.reflect.ConstantPool;
57 import sun.reflect.Reflection;
58 import sun.reflect.ReflectionFactory;
59 import sun.reflect.SignatureIterator;
60 import sun.reflect.generics.factory.CoreReflectionFactory;
61 import sun.reflect.generics.factory.GenericsFactory;
62 import sun.reflect.generics.repository.ClassRepository;
63 import sun.reflect.generics.repository.MethodRepository;
64 import sun.reflect.generics.repository.ConstructorRepository;
65 import sun.reflect.generics.scope.ClassScope;
66 import sun.security.util.SecurityConstants;
67 import java.lang.annotation.Annotation;
68 import sun.reflect.annotation;
69
70 /**
71 * Instances of the class {@code Class} represent classes and
72 * interfaces in a running Java application. An enum is a kind of
73 * class and an annotation is a kind of interface. Every array also
74 * belongs to a class that is reflected as a {@code Class} object
75 * that is shared by all arrays with the same element type and number
76 * of dimensions. The primitive Java types ({@code boolean},
77 * {@code byte}, {@code char}, {@code short},
78 * {@code int}, {@code long}, {@code float}, and
79 * {@code double}), and the keyword {@code void} are also
80 * represented as {@code Class} objects.
81 *
82 * <p> {@code Class} has no public constructor. Instead {@code Class}
83 * objects are constructed automatically by the Java Virtual Machine as classes
84 * are loaded and by calls to the {@code defineClass} method in the class
85 * loader.
86 *
87 * <p> The following example uses a {@code Class} object to print the
88 * class name of an object:
89 *
90 * <p> <blockquote><pre>
91 * void printClassName(Object obj) {
92 * System.out.println("The class of " + obj +
93 * " is " + obj.getClass().getName());
94 * }
95 * </pre></blockquote>
96 *
97 * <p> It is also possible to get the {@code Class} object for a named
98 * type (or for void) using a class literal
99 * (JLS Section <A HREF="http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#251530">15.8.2</A>).
100 * For example:
101 *
102 * <p> <blockquote>
103 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
104 * </blockquote>
105 *
106 * @param <T> the type of the class modeled by this {@code Class}
107 * object. For example, the type of {@code String.class} is {@code
108 * Class<String>}. Use {@code Class<?>} if the class being modeled is
109 * unknown.
110 *
111 * @author unascribed
112 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
113 * @since JDK1.0
114 */
115 public final
116 class Class<T> implements java.io.Serializable,
117 java.lang.reflect.GenericDeclaration,
118 java.lang.reflect.Type,
119 java.lang.reflect.AnnotatedElement {
120 private static final int ANNOTATION= 0x00002000;
121 private static final int ENUM = 0x00004000;
122 private static final int SYNTHETIC = 0x00001000;
123
124 private static native void registerNatives();
125 static {
126 registerNatives();
127 }
128
129 /*
130 * Constructor. Only the Java Virtual Machine creates Class
131 * objects.
132 */
133 private Class() {}
134
135
136 /**
137 * Converts the object to a string. The string representation is the
138 * string "class" or "interface", followed by a space, and then by the
139 * fully qualified name of the class in the format returned by
140 * {@code getName}. If this {@code Class} object represents a
141 * primitive type, this method returns the name of the primitive type. If
142 * this {@code Class} object represents void this method returns
143 * "void".
144 *
145 * @return a string representation of this class object.
146 */
147 public String toString() {
148 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
149 + getName();
150 }
151
152
153 /**
154 * Returns the {@code Class} object associated with the class or
155 * interface with the given string name. Invoking this method is
156 * equivalent to:
157 *
158 * <blockquote>
159 * {@code Class.forName(className, true, currentLoader)}
160 * </blockquote>
161 *
162 * where {@code currentLoader} denotes the defining class loader of
163 * the current class.
164 *
165 * <p> For example, the following code fragment returns the
166 * runtime {@code Class} descriptor for the class named
167 * {@code java.lang.Thread}:
168 *
169 * <blockquote>
170 * {@code Class t = Class.forName("java.lang.Thread")}
171 * </blockquote>
172 * <p>
173 * A call to {@code forName("X")} causes the class named
174 * {@code X} to be initialized.
175 *
176 * @param className the fully qualified name of the desired class.
177 * @return the {@code Class} object for the class with the
178 * specified name.
179 * @exception LinkageError if the linkage fails
180 * @exception ExceptionInInitializerError if the initialization provoked
181 * by this method fails
182 * @exception ClassNotFoundException if the class cannot be located
183 */
184 public static Class<?> forName(String className)
185 throws ClassNotFoundException {
186 return forName0(className, true, ClassLoader.getCallerClassLoader());
187 }
188
189
190 /**
191 * Returns the {@code Class} object associated with the class or
192 * interface with the given string name, using the given class loader.
193 * Given the fully qualified name for a class or interface (in the same
194 * format returned by {@code getName}) this method attempts to
195 * locate, load, and link the class or interface. The specified class
196 * loader is used to load the class or interface. If the parameter
197 * {@code loader} is null, the class is loaded through the bootstrap
198 * class loader. The class is initialized only if the
199 * {@code initialize} parameter is {@code true} and if it has
200 * not been initialized earlier.
201 *
202 * <p> If {@code name} denotes a primitive type or void, an attempt
203 * will be made to locate a user-defined class in the unnamed package whose
204 * name is {@code name}. Therefore, this method cannot be used to
205 * obtain any of the {@code Class} objects representing primitive
206 * types or void.
207 *
208 * <p> If {@code name} denotes an array class, the component type of
209 * the array class is loaded but not initialized.
210 *
211 * <p> For example, in an instance method the expression:
212 *
213 * <blockquote>
214 * {@code Class.forName("Foo")}
215 * </blockquote>
216 *
217 * is equivalent to:
218 *
219 * <blockquote>
220 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
221 * </blockquote>
222 *
223 * Note that this method throws errors related to loading, linking or
224 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
225 * Java Language Specification</em>.
226 * Note that this method does not check whether the requested class
227 * is accessible to its caller.
228 *
229 * <p> If the {@code loader} is {@code null}, and a security
230 * manager is present, and the caller's class loader is not null, then this
231 * method calls the security manager's {@code checkPermission} method
232 * with a {@code RuntimePermission("getClassLoader")} permission to
233 * ensure it's ok to access the bootstrap class loader.
234 *
235 * @param name fully qualified name of the desired class
236 * @param initialize whether the class must be initialized
237 * @param loader class loader from which the class must be loaded
238 * @return class object representing the desired class
239 *
240 * @exception LinkageError if the linkage fails
241 * @exception ExceptionInInitializerError if the initialization provoked
242 * by this method fails
243 * @exception ClassNotFoundException if the class cannot be located by
244 * the specified class loader
245 *
246 * @see java.lang.Class#forName(String)
247 * @see java.lang.ClassLoader
248 * @since 1.2
249 */
250 public static Class<?> forName(String name, boolean initialize,
251 ClassLoader loader)
252 throws ClassNotFoundException
253 {
254 if (loader == null) {
255 SecurityManager sm = System.getSecurityManager();
256 if (sm != null) {
257 ClassLoader ccl = ClassLoader.getCallerClassLoader();
258 if (ccl != null) {
259 sm.checkPermission(
260 SecurityConstants.GET_CLASSLOADER_PERMISSION);
261 }
262 }
263 }
264 return forName0(name, initialize, loader);
265 }
266
267 /** Called after security checks have been made. */
268 private static native Class forName0(String name, boolean initialize,
269 ClassLoader loader)
270 throws ClassNotFoundException;
271
272 /**
273 * Creates a new instance of the class represented by this {@code Class}
274 * object. The class is instantiated as if by a {@code new}
275 * expression with an empty argument list. The class is initialized if it
276 * has not already been initialized.
277 *
278 * <p>Note that this method propagates any exception thrown by the
279 * nullary constructor, including a checked exception. Use of
280 * this method effectively bypasses the compile-time exception
281 * checking that would otherwise be performed by the compiler.
282 * The {@link
283 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
284 * Constructor.newInstance} method avoids this problem by wrapping
285 * any exception thrown by the constructor in a (checked) {@link
286 * java.lang.reflect.InvocationTargetException}.
287 *
288 * @return a newly allocated instance of the class represented by this
289 * object.
290 * @exception IllegalAccessException if the class or its nullary
291 * constructor is not accessible.
292 * @exception InstantiationException
293 * if this {@code Class} represents an abstract class,
294 * an interface, an array class, a primitive type, or void;
295 * or if the class has no nullary constructor;
296 * or if the instantiation fails for some other reason.
297 * @exception ExceptionInInitializerError if the initialization
298 * provoked by this method fails.
299 * @exception SecurityException
300 * If a security manager, <i>s</i>, is present and any of the
301 * following conditions is met:
302 *
303 * <ul>
304 *
305 * <li> invocation of
306 * {@link SecurityManager#checkMemberAccess
307 * s.checkMemberAccess(this, Member.PUBLIC)} denies
308 * creation of new instances of this class
309 *
310 * <li> the caller's class loader is not the same as or an
311 * ancestor of the class loader for the current class and
312 * invocation of {@link SecurityManager#checkPackageAccess
313 * s.checkPackageAccess()} denies access to the package
314 * of this class
315 *
316 * </ul>
317 *
318 */
319 public T newInstance()
320 throws InstantiationException, IllegalAccessException
321 {
322 if (System.getSecurityManager() != null) {
323 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
324 }
325 return newInstance0();
326 }
327
328 private T newInstance0()
329 throws InstantiationException, IllegalAccessException
330 {
331 // NOTE: the following code may not be strictly correct under
332 // the current Java memory model.
333
334 // Constructor lookup
335 if (cachedConstructor == null) {
336 if (this == Class.class) {
337 throw new IllegalAccessException(
338 "Can not call newInstance() on the Class for java.lang.Class"
339 );
340 }
341 try {
342 Class[] empty = {};
343 final Constructor<T> c = getConstructor0(empty, Member.DECLARED);
344 // Disable accessibility checks on the constructor
345 // since we have to do the security check here anyway
346 // (the stack depth is wrong for the Constructor's
347 // security check to work)
348 java.security.AccessController.doPrivileged(
349 new java.security.PrivilegedAction<Void>() {
350 public Void run() {
351 c.setAccessible(true);
352 return null;
353 }
354 });
355 cachedConstructor = c;
356 } catch (NoSuchMethodException e) {
357 throw new InstantiationException(getName());
358 }
359 }
360 Constructor<T> tmpConstructor = cachedConstructor;
361 // Security check (same as in java.lang.reflect.Constructor)
362 int modifiers = tmpConstructor.getModifiers();
363 if (!Reflection.quickCheckMemberAccess(this, modifiers)) {
364 Class caller = Reflection.getCallerClass(3);
365 if (newInstanceCallerCache != caller) {
366 Reflection.ensureMemberAccess(caller, this, null, modifiers);
367 newInstanceCallerCache = caller;
368 }
369 }
370 // Run constructor
371 try {
372 return tmpConstructor.newInstance((Object[])null);
373 } catch (InvocationTargetException e) {
374 Unsafe.getUnsafe().throwException(e.getTargetException());
375 // Not reached
376 return null;
377 }
378 }
379 private volatile transient Constructor<T> cachedConstructor;
380 private volatile transient Class newInstanceCallerCache;
381
382
383 /**
384 * Determines if the specified {@code Object} is assignment-compatible
385 * with the object represented by this {@code Class}. This method is
386 * the dynamic equivalent of the Java language {@code instanceof}
387 * operator. The method returns {@code true} if the specified
388 * {@code Object} argument is non-null and can be cast to the
389 * reference type represented by this {@code Class} object without
390 * raising a {@code ClassCastException.} It returns {@code false}
391 * otherwise.
392 *
393 * <p> Specifically, if this {@code Class} object represents a
394 * declared class, this method returns {@code true} if the specified
395 * {@code Object} argument is an instance of the represented class (or
396 * of any of its subclasses); it returns {@code false} otherwise. If
397 * this {@code Class} object represents an array class, this method
398 * returns {@code true} if the specified {@code Object} argument
399 * can be converted to an object of the array class by an identity
400 * conversion or by a widening reference conversion; it returns
401 * {@code false} otherwise. If this {@code Class} object
402 * represents an interface, this method returns {@code true} if the
403 * class or any superclass of the specified {@code Object} argument
404 * implements this interface; it returns {@code false} otherwise. If
405 * this {@code Class} object represents a primitive type, this method
406 * returns {@code false}.
407 *
408 * @param obj the object to check
409 * @return true if {@code obj} is an instance of this class
410 *
411 * @since JDK1.1
412 */
413 public native boolean isInstance(Object obj);
414
415
416 /**
417 * Determines if the class or interface represented by this
418 * {@code Class} object is either the same as, or is a superclass or
419 * superinterface of, the class or interface represented by the specified
420 * {@code Class} parameter. It returns {@code true} if so;
421 * otherwise it returns {@code false}. If this {@code Class}
422 * object represents a primitive type, this method returns
423 * {@code true} if the specified {@code Class} parameter is
424 * exactly this {@code Class} object; otherwise it returns
425 * {@code false}.
426 *
427 * <p> Specifically, this method tests whether the type represented by the
428 * specified {@code Class} parameter can be converted to the type
429 * represented by this {@code Class} object via an identity conversion
430 * or via a widening reference conversion. See <em>The Java Language
431 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
432 *
433 * @param cls the {@code Class} object to be checked
434 * @return the {@code boolean} value indicating whether objects of the
435 * type {@code cls} can be assigned to objects of this class
436 * @exception NullPointerException if the specified Class parameter is
437 * null.
438 * @since JDK1.1
439 */
440 public native boolean isAssignableFrom(Class<?> cls);
441
442
443 /**
444 * Determines if the specified {@code Class} object represents an
445 * interface type.
446 *
447 * @return {@code true} if this object represents an interface;
448 * {@code false} otherwise.
449 */
450 public native boolean isInterface();
451
452
453 /**
454 * Determines if this {@code Class} object represents an array class.
455 *
456 * @return {@code true} if this object represents an array class;
457 * {@code false} otherwise.
458 * @since JDK1.1
459 */
460 public native boolean isArray();
461
462
463 /**
464 * Determines if the specified {@code Class} object represents a
465 * primitive type.
466 *
467 * <p> There are nine predefined {@code Class} objects to represent
468 * the eight primitive types and void. These are created by the Java
469 * Virtual Machine, and have the same names as the primitive types that
470 * they represent, namely {@code boolean}, {@code byte},
471 * {@code char}, {@code short}, {@code int},
472 * {@code long}, {@code float}, and {@code double}.
473 *
474 * <p> These objects may only be accessed via the following public static
475 * final variables, and are the only {@code Class} objects for which
476 * this method returns {@code true}.
477 *
478 * @return true if and only if this class represents a primitive type
479 *
480 * @see java.lang.Boolean#TYPE
481 * @see java.lang.Character#TYPE
482 * @see java.lang.Byte#TYPE
483 * @see java.lang.Short#TYPE
484 * @see java.lang.Integer#TYPE
485 * @see java.lang.Long#TYPE
486 * @see java.lang.Float#TYPE
487 * @see java.lang.Double#TYPE
488 * @see java.lang.Void#TYPE
489 * @since JDK1.1
490 */
491 public native boolean isPrimitive();
492
493 /**
494 * Returns true if this {@code Class} object represents an annotation
495 * type. Note that if this method returns true, {@link #isInterface()}
496 * would also return true, as all annotation types are also interfaces.
497 *
498 * @return {@code true} if this class object represents an annotation
499 * type; {@code false} otherwise
500 * @since 1.5
501 */
502 public boolean isAnnotation() {
503 return (getModifiers() & ANNOTATION) != 0;
504 }
505
506 /**
507 * Returns {@code true} if this class is a synthetic class;
508 * returns {@code false} otherwise.
509 * @return {@code true} if and only if this class is a synthetic class as
510 * defined by the Java Language Specification.
511 * @since 1.5
512 */
513 public boolean isSynthetic() {
514 return (getModifiers() & SYNTHETIC) != 0;
515 }
516
517 /**
518 * Returns the name of the entity (class, interface, array class,
519 * primitive type, or void) represented by this {@code Class} object,
520 * as a {@code String}.
521 *
522 * <p> If this class object represents a reference type that is not an
523 * array type then the binary name of the class is returned, as specified
524 * by the Java Language Specification, Second Edition.
525 *
526 * <p> If this class object represents a primitive type or void, then the
527 * name returned is a {@code String} equal to the Java language
528 * keyword corresponding to the primitive type or void.
529 *
530 * <p> If this class object represents a class of arrays, then the internal
531 * form of the name consists of the name of the element type preceded by
532 * one or more '{@code [}' characters representing the depth of the array
533 * nesting. The encoding of element type names is as follows:
534 *
535 * <blockquote><table summary="Element types and encodings">
536 * <tr><th> Element Type <th> <th> Encoding
537 * <tr><td> boolean <td> <td align=center> Z
538 * <tr><td> byte <td> <td align=center> B
539 * <tr><td> char <td> <td align=center> C
540 * <tr><td> class or interface
541 * <td> <td align=center> L<i>classname</i>;
542 * <tr><td> double <td> <td align=center> D
543 * <tr><td> float <td> <td align=center> F
544 * <tr><td> int <td> <td align=center> I
545 * <tr><td> long <td> <td align=center> J
546 * <tr><td> short <td> <td align=center> S
547 * </table></blockquote>
548 *
549 * <p> The class or interface name <i>classname</i> is the binary name of
550 * the class specified above.
551 *
552 * <p> Examples:
553 * <blockquote><pre>
554 * String.class.getName()
555 * returns "java.lang.String"
556 * byte.class.getName()
557 * returns "byte"
558 * (new Object[3]).getClass().getName()
559 * returns "[Ljava.lang.Object;"
560 * (new int[3][4][5][6][7][8][9]).getClass().getName()
561 * returns "[[[[[[[I"
562 * </pre></blockquote>
563 *
564 * @return the name of the class or interface
565 * represented by this object.
566 */
567 public String getName() {
568 if (name == null)
569 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 (ccl != null && ccl != cl && !cl.isAncestor(ccl)) {
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 GenericSignatureFormatError if the generic
631 * signature of this generic declaration does not conform to
632 * the format specified in the Java Virtual Machine Specification,
633 * 3rd edition
634 * @since 1.5
635 */
636 public TypeVariable<Class<T>>[] getTypeParameters() {
637 if (getGenericSignature() != null)
638 return (TypeVariable<Class<T>>[])getGenericInfo().getTypeParameters();
639 else
640 return (TypeVariable<Class<T>>[])new TypeVariable[0];
641 }
642
643
644 /**
645 * Returns the {@code Class} representing the superclass of the entity
646 * (class, interface, primitive type or void) represented by this
647 * {@code Class}. If this {@code Class} represents either the
648 * {@code Object} class, an interface, a primitive type, or void, then
649 * null is returned. If this object represents an array class then the
650 * {@code Class} object representing the {@code Object} class is
651 * returned.
652 *
653 * @return the superclass of the class represented by this object.
654 */
655 public native Class<? super T> getSuperclass();
656
657
658 /**
659 * Returns the {@code Type} representing the direct superclass of
660 * the entity (class, interface, primitive type or void) represented by
661 * this {@code Class}.
662 *
663 * <p>If the superclass is a parameterized type, the {@code Type}
664 * object returned must accurately reflect the actual type
665 * parameters used in the source code. The parameterized type
666 * representing the superclass is created if it had not been
667 * created before. See the declaration of {@link
668 * java.lang.reflect.ParameterizedType ParameterizedType} for the
669 * semantics of the creation process for parameterized types. If
670 * this {@code Class} represents either the {@code Object}
671 * class, an interface, a primitive type, or void, then null is
672 * returned. If this object represents an array class then the
673 * {@code Class} object representing the {@code Object} class is
674 * returned.
675 *
676 * @throws GenericSignatureFormatError if the generic
677 * class signature does not conform to the format specified in the
678 * Java Virtual Machine Specification, 3rd edition
679 * @throws TypeNotPresentException if the generic superclass
680 * refers to a non-existent type declaration
681 * @throws MalformedParameterizedTypeException if the
682 * generic superclass refers to a parameterized type that cannot be
683 * instantiated for any reason
684 * @return the superclass of the class represented by this object
685 * @since 1.5
686 */
687 public Type getGenericSuperclass() {
688 if (getGenericSignature() != null) {
689 // Historical irregularity:
690 // Generic signature marks interfaces with superclass = Object
691 // but this API returns null for interfaces
692 if (isInterface())
693 return null;
694 return getGenericInfo().getSuperclass();
695 } else
696 return getSuperclass();
697 }
698
699 /**
700 * Gets the package for this class. The class loader of this class is used
701 * to find the package. If the class was loaded by the bootstrap class
702 * loader the set of packages loaded from CLASSPATH is searched to find the
703 * package of the class. Null is returned if no package object was created
704 * by the class loader of this class.
705 *
706 * <p> Packages have attributes for versions and specifications only if the
707 * information was defined in the manifests that accompany the classes, and
708 * if the class loader created the package instance with the attributes
709 * from the manifest.
710 *
711 * @return the package of the class, or null if no package
712 * information is available from the archive or codebase.
713 */
714 public Package getPackage() {
715 return Package.getPackage(this);
716 }
717
718
719 /**
720 * Determines the interfaces implemented by the class or interface
721 * represented by this object.
722 *
723 * <p> If this object represents a class, the return value is an array
724 * containing objects representing all interfaces implemented by the
725 * class. The order of the interface objects in the array corresponds to
726 * the order of the interface names in the {@code implements} clause
727 * of the declaration of the class represented by this object. For
728 * example, given the declaration:
729 * <blockquote>
730 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
731 * </blockquote>
732 * suppose the value of {@code s} is an instance of
733 * {@code Shimmer}; the value of the expression:
734 * <blockquote>
735 * {@code s.getClass().getInterfaces()[0]}
736 * </blockquote>
737 * is the {@code Class} object that represents interface
738 * {@code FloorWax}; and the value of:
739 * <blockquote>
740 * {@code s.getClass().getInterfaces()[1]}
741 * </blockquote>
742 * is the {@code Class} object that represents interface
743 * {@code DessertTopping}.
744 *
745 * <p> If this object represents an interface, the array contains objects
746 * representing all interfaces extended by the interface. The order of the
747 * interface objects in the array corresponds to the order of the interface
748 * names in the {@code extends} clause of the declaration of the
749 * interface represented by this object.
750 *
751 * <p> If this object represents a class or interface that implements no
752 * interfaces, the method returns an array of length 0.
753 *
754 * <p> If this object represents a primitive type or void, the method
755 * returns an array of length 0.
756 *
757 * @return an array of interfaces implemented by this class.
758 */
759 public native Class<?>[] getInterfaces();
760
761 /**
762 * Returns the {@code Type}s representing the interfaces
763 * directly implemented by the class or interface represented by
764 * this object.
765 *
766 * <p>If a superinterface is a parameterized type, the
767 * {@code Type} object returned for it must accurately reflect
768 * the actual type parameters used in the source code. The
769 * parameterized type representing each superinterface is created
770 * if it had not been created before. See the declaration of
771 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
772 * for the semantics of the creation process for parameterized
773 * types.
774 *
775 * <p> If this object represents a class, the return value is an
776 * array containing objects representing all interfaces
777 * implemented by the class. The order of the interface objects in
778 * the array corresponds to the order of the interface names in
779 * the {@code implements} clause of the declaration of the class
780 * represented by this object. In the case of an array class, the
781 * interfaces {@code Cloneable} and {@code Serializable} are
782 * returned in that order.
783 *
784 * <p>If this object represents an interface, the array contains
785 * objects representing all interfaces directly extended by the
786 * interface. The order of the interface objects in the array
787 * corresponds to the order of the interface names in the
788 * {@code extends} clause of the declaration of the interface
789 * represented by this object.
790 *
791 * <p>If this object represents a class or interface that
792 * implements no interfaces, the method returns an array of length
793 * 0.
794 *
795 * <p>If this object represents a primitive type or void, the
796 * method returns an array of length 0.
797 *
798 * @throws GenericSignatureFormatError
799 * if the generic class signature does not conform to the format
800 * specified in the Java Virtual Machine Specification, 3rd edition
801 * @throws TypeNotPresentException if any of the generic
802 * superinterfaces refers to a non-existent type declaration
803 * @throws MalformedParameterizedTypeException if any of the
804 * generic superinterfaces refer to a parameterized type that cannot
805 * be instantiated for any reason
806 * @return an array of interfaces implemented by this class
807 * @since 1.5
808 */
809 public Type[] getGenericInterfaces() {
810 if (getGenericSignature() != null)
811 return getGenericInfo().getSuperInterfaces();
812 else
813 return getInterfaces();
814 }
815
816
817 /**
818 * Returns the {@code Class} representing the component type of an
819 * array. If this class does not represent an array class this method
820 * returns null.
821 *
822 * @return the {@code Class} representing the component type of this
823 * class if this class is an array
824 * @see java.lang.reflect.Array
825 * @since JDK1.1
826 */
827 public native Class<?> getComponentType();
828
829
830 /**
831 * Returns the Java language modifiers for this class or interface, encoded
832 * in an integer. The modifiers consist of the Java Virtual Machine's
833 * constants for {@code public}, {@code protected},
834 * {@code private}, {@code final}, {@code static},
835 * {@code abstract} and {@code interface}; they should be decoded
836 * using the methods of class {@code Modifier}.
837 *
838 * <p> If the underlying class is an array class, then its
839 * {@code public}, {@code private} and {@code protected}
840 * modifiers are the same as those of its component type. If this
841 * {@code Class} represents a primitive type or void, its
842 * {@code public} modifier is always {@code true}, and its
843 * {@code protected} and {@code private} modifiers are always
844 * {@code false}. If this object represents an array class, a
845 * primitive type or void, then its {@code final} modifier is always
846 * {@code true} and its interface modifier is always
847 * {@code false}. The values of its other modifiers are not determined
848 * by this specification.
849 *
850 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
851 * Specification</em>, table 4.1.
852 *
853 * @return the {@code int} representing the modifiers for this class
854 * @see java.lang.reflect.Modifier
855 * @since JDK1.1
856 */
857 public native int getModifiers();
858
859
860 /**
861 * Gets the signers of this class.
862 *
863 * @return the signers of this class, or null if there are no signers. In
864 * particular, this method returns null if this object represents
865 * a primitive type or void.
866 * @since JDK1.1
867 */
868 public native Object[] getSigners();
869
870
871 /**
872 * Set the signers of this class.
873 */
874 native void setSigners(Object[] signers);
875
876
877 /**
878 * If this {@code Class} object represents a local or anonymous
879 * class within a method, returns a {@link
880 * java.lang.reflect.Method Method} object representing the
881 * immediately enclosing method of the underlying class. Returns
882 * {@code null} otherwise.
883 *
884 * In particular, this method returns {@code null} if the underlying
885 * class is a local or anonymous class immediately enclosed by a type
886 * declaration, instance initializer or static initializer.
887 *
888 * @return the immediately enclosing method of the underlying class, if
889 * that class is a local or anonymous class; otherwise {@code null}.
890 * @since 1.5
891 */
892 public Method getEnclosingMethod() {
893 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
894
895 if (enclosingInfo == null)
896 return null;
897 else {
898 if (!enclosingInfo.isMethod())
899 return null;
900
901 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
902 getFactory());
903 Class returnType = toClass(typeInfo.getReturnType());
904 Type [] parameterTypes = typeInfo.getParameterTypes();
905 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
906
907 // Convert Types to Classes; returned types *should*
908 // be class objects since the methodDescriptor's used
909 // don't have generics information
910 for(int i = 0; i < parameterClasses.length; i++)
911 parameterClasses[i] = toClass(parameterTypes[i]);
912
913 /*
914 * Loop over all declared methods; match method name,
915 * number of and type of parameters, *and* return
916 * type. Matching return type is also necessary
917 * because of covariant returns, etc.
918 */
919 for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) {
920 if (m.getName().equals(enclosingInfo.getName()) ) {
921 Class<?>[] candidateParamClasses = m.getParameterTypes();
922 if (candidateParamClasses.length == parameterClasses.length) {
923 boolean matches = true;
924 for(int i = 0; i < candidateParamClasses.length; i++) {
925 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
926 matches = false;
927 break;
928 }
929 }
930
931 if (matches) { // finally, check return type
932 if (m.getReturnType().equals(returnType) )
933 return m;
934 }
935 }
936 }
937 }
938
939 throw new InternalError("Enclosing method not found");
940 }
941 }
942
943 private native Object[] getEnclosingMethod0();
944
945 private EnclosingMethodInfo getEnclosingMethodInfo() {
946 Object[] enclosingInfo = getEnclosingMethod0();
947 if (enclosingInfo == null)
948 return null;
949 else {
950 return new EnclosingMethodInfo(enclosingInfo);
951 }
952 }
953
954 private final static class EnclosingMethodInfo {
955 private Class<?> enclosingClass;
956 private String name;
957 private String descriptor;
958
959 private EnclosingMethodInfo(Object[] enclosingInfo) {
960 if (enclosingInfo.length != 3)
961 throw new InternalError("Malformed enclosing method information");
962 try {
963 // The array is expected to have three elements:
964
965 // the immediately enclosing class
966 enclosingClass = (Class<?>) enclosingInfo[0];
967 assert(enclosingClass != null);
968
969 // the immediately enclosing method or constructor's
970 // name (can be null).
971 name = (String) enclosingInfo[1];
972
973 // the immediately enclosing method or constructor's
974 // descriptor (null iff name is).
975 descriptor = (String) enclosingInfo[2];
976 assert((name != null && descriptor != null) || name == descriptor);
977 } catch (ClassCastException cce) {
978 throw new InternalError("Invalid type in enclosing method information");
979 }
980 }
981
982 boolean isPartial() {
983 return enclosingClass == null || name == null || descriptor == null;
984 }
985
986 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
987
988 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
989
990 Class<?> getEnclosingClass() { return enclosingClass; }
991
992 String getName() { return name; }
993
994 String getDescriptor() { return descriptor; }
995
996 }
997
998 private static Class toClass(Type o) {
999 if (o instanceof GenericArrayType)
1000 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1001 0)
1002 .getClass();
1003 return (Class)o;
1004 }
1005
1006 /**
1007 * If this {@code Class} object represents a local or anonymous
1008 * class within a constructor, returns a {@link
1009 * java.lang.reflect.Constructor Constructor} object representing
1010 * the immediately enclosing constructor of the underlying
1011 * class. Returns {@code null} otherwise. In particular, this
1012 * method returns {@code null} if the underlying class is a local
1013 * or anonymous class immediately enclosed by a type declaration,
1014 * instance initializer or static initializer.
1015 *
1016 * @return the immediately enclosing constructor of the underlying class, if
1017 * that class is a local or anonymous class; otherwise {@code null}.
1018 * @since 1.5
1019 */
1020 public Constructor<?> getEnclosingConstructor() {
1021 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1022
1023 if (enclosingInfo == null)
1024 return null;
1025 else {
1026 if (!enclosingInfo.isConstructor())
1027 return null;
1028
1029 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1030 getFactory());
1031 Type [] parameterTypes = typeInfo.getParameterTypes();
1032 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1033
1034 // Convert Types to Classes; returned types *should*
1035 // be class objects since the methodDescriptor's used
1036 // don't have generics information
1037 for(int i = 0; i < parameterClasses.length; i++)
1038 parameterClasses[i] = toClass(parameterTypes[i]);
1039
1040 /*
1041 * Loop over all declared constructors; match number
1042 * of and type of parameters.
1043 */
1044 for(Constructor c: enclosingInfo.getEnclosingClass().getDeclaredConstructors()) {
1045 Class<?>[] candidateParamClasses = c.getParameterTypes();
1046 if (candidateParamClasses.length == parameterClasses.length) {
1047 boolean matches = true;
1048 for(int i = 0; i < candidateParamClasses.length; i++) {
1049 if (!candidateParamClasses[i].equals(parameterClasses[i])) {
1050 matches = false;
1051 break;
1052 }
1053 }
1054
1055 if (matches)
1056 return c;
1057 }
1058 }
1059
1060 throw new InternalError("Enclosing constructor not found");
1061 }
1062 }
1063
1064
1065 /**
1066 * If the class or interface represented by this {@code Class} object
1067 * is a member of another class, returns the {@code Class} object
1068 * representing the class in which it was declared. This method returns
1069 * null if this class or interface is not a member of any other class. If
1070 * this {@code Class} object represents an array class, a primitive
1071 * type, or void,then this method returns null.
1072 *
1073 * @return the declaring class for this class
1074 * @since JDK1.1
1075 */
1076 public native Class<?> getDeclaringClass();
1077
1078
1079 /**
1080 * Returns the immediately enclosing class of the underlying
1081 * class. If the underlying class is a top level class this
1082 * method returns {@code null}.
1083 * @return the immediately enclosing class of the underlying class
1084 * @since 1.5
1085 */
1086 public Class<?> getEnclosingClass() {
1087 // There are five kinds of classes (or interfaces):
1088 // a) Top level classes
1089 // b) Nested classes (static member classes)
1090 // c) Inner classes (non-static member classes)
1091 // d) Local classes (named classes declared within a method)
1092 // e) Anonymous classes
1093
1094
1095 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1096 // attribute if and only if it is a local class or an
1097 // anonymous class.
1098 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1099
1100 if (enclosingInfo == null) {
1101 // This is a top level or a nested class or an inner class (a, b, or c)
1102 return getDeclaringClass();
1103 } else {
1104 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1105 // This is a local class or an anonymous class (d or e)
1106 if (enclosingClass == this || enclosingClass == null)
1107 throw new InternalError("Malformed enclosing method information");
1108 else
1109 return enclosingClass;
1110 }
1111 }
1112
1113 /**
1114 * Returns the simple name of the underlying class as given in the
1115 * source code. Returns an empty string if the underlying class is
1116 * anonymous.
1117 *
1118 * <p>The simple name of an array is the simple name of the
1119 * component type with "[]" appended. In particular the simple
1120 * name of an array whose component type is anonymous is "[]".
1121 *
1122 * @return the simple name of the underlying class
1123 * @since 1.5
1124 */
1125 public String getSimpleName() {
1126 if (isArray())
1127 return getComponentType().getSimpleName()+"[]";
1128
1129 String simpleName = getSimpleBinaryName();
1130 if (simpleName == null) { // top level class
1131 simpleName = getName();
1132 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
1133 }
1134 // According to JLS3 "Binary Compatibility" (13.1) the binary
1135 // name of non-package classes (not top level) is the binary
1136 // name of the immediately enclosing class followed by a '$' followed by:
1137 // (for nested and inner classes): the simple name.
1138 // (for local classes): 1 or more digits followed by the simple name.
1139 // (for anonymous classes): 1 or more digits.
1140
1141 // Since getSimpleBinaryName() will strip the binary name of
1142 // the immediatly enclosing class, we are now looking at a
1143 // string that matches the regular expression "\$[0-9]*"
1144 // followed by a simple name (considering the simple of an
1145 // anonymous class to be the empty string).
1146
1147 // Remove leading "\$[0-9]*" from the name
1148 int length = simpleName.length();
1149 if (length < 1 || simpleName.charAt(0) != '$')
1150 throw new InternalError("Malformed class name");
1151 int index = 1;
1152 while (index < length && isAsciiDigit(simpleName.charAt(index)))
1153 index++;
1154 // Eventually, this is the empty string iff this is an anonymous class
1155 return simpleName.substring(index);
1156 }
1157
1158 /**
1159 * Character.isDigit answers {@code true} to some non-ascii
1160 * digits. This one does not.
1161 */
1162 private static boolean isAsciiDigit(char c) {
1163 return '0' <= c && c <= '9';
1164 }
1165
1166 /**
1167 * Returns the canonical name of the underlying class as
1168 * defined by the Java Language Specification. Returns null if
1169 * the underlying class does not have a canonical name (i.e., if
1170 * it is a local or anonymous class or an array whose component
1171 * type does not have a canonical name).
1172 * @return the canonical name of the underlying class if it exists, and
1173 * {@code null} otherwise.
1174 * @since 1.5
1175 */
1176 public String getCanonicalName() {
1177 if (isArray()) {
1178 String canonicalName = getComponentType().getCanonicalName();
1179 if (canonicalName != null)
1180 return canonicalName + "[]";
1181 else
1182 return null;
1183 }
1184 if (isLocalOrAnonymousClass())
1185 return null;
1186 Class<?> enclosingClass = getEnclosingClass();
1187 if (enclosingClass == null) { // top level class
1188 return getName();
1189 } else {
1190 String enclosingName = enclosingClass.getCanonicalName();
1191 if (enclosingName == null)
1192 return null;
1193 return enclosingName + "." + getSimpleName();
1194 }
1195 }
1196
1197 /**
1198 * Returns {@code true} if and only if the underlying class
1199 * is an anonymous class.
1200 *
1201 * @return {@code true} if and only if this class is an anonymous class.
1202 * @since 1.5
1203 */
1204 public boolean isAnonymousClass() {
1205 return "".equals(getSimpleName());
1206 }
1207
1208 /**
1209 * Returns {@code true} if and only if the underlying class
1210 * is a local class.
1211 *
1212 * @return {@code true} if and only if this class is a local class.
1213 * @since 1.5
1214 */
1215 public boolean isLocalClass() {
1216 return isLocalOrAnonymousClass() && !isAnonymousClass();
1217 }
1218
1219 /**
1220 * Returns {@code true} if and only if the underlying class
1221 * is a member class.
1222 *
1223 * @return {@code true} if and only if this class is a member class.
1224 * @since 1.5
1225 */
1226 public boolean isMemberClass() {
1227 return getSimpleBinaryName() != null && !isLocalOrAnonymousClass();
1228 }
1229
1230 /**
1231 * Returns the "simple binary name" of the underlying class, i.e.,
1232 * the binary name without the leading enclosing class name.
1233 * Returns {@code null} if the underlying class is a top level
1234 * class.
1235 */
1236 private String getSimpleBinaryName() {
1237 Class<?> enclosingClass = getEnclosingClass();
1238 if (enclosingClass == null) // top level class
1239 return null;
1240 // Otherwise, strip the enclosing class' name
1241 try {
1242 return getName().substring(enclosingClass.getName().length());
1243 } catch (IndexOutOfBoundsException ex) {
1244 throw new InternalError("Malformed class name");
1245 }
1246 }
1247
1248 /**
1249 * Returns {@code true} if this is a local class or an anonymous
1250 * class. Returns {@code false} otherwise.
1251 */
1252 private boolean isLocalOrAnonymousClass() {
1253 // JVM Spec 4.8.6: A class must have an EnclosingMethod
1254 // attribute if and only if it is a local class or an
1255 // anonymous class.
1256 return getEnclosingMethodInfo() != null;
1257 }
1258
1259 /**
1260 * Returns an array containing {@code Class} objects representing all
1261 * the public classes and interfaces that are members of the class
1262 * represented by this {@code Class} object. This includes public
1263 * class and interface members inherited from superclasses and public class
1264 * and interface members declared by the class. This method returns an
1265 * array of length 0 if this {@code Class} object has no public member
1266 * classes or interfaces. This method also returns an array of length 0 if
1267 * this {@code Class} object represents a primitive type, an array
1268 * class, or void.
1269 *
1270 * @return the array of {@code Class} objects representing the public
1271 * members of this class
1272 * @exception SecurityException
1273 * If a security manager, <i>s</i>, is present and any of the
1274 * following conditions is met:
1275 *
1276 * <ul>
1277 *
1278 * <li> invocation of
1279 * {@link SecurityManager#checkMemberAccess
1280 * s.checkMemberAccess(this, Member.PUBLIC)} method
1281 * denies access to the classes within this class
1282 *
1283 * <li> the caller's class loader is not the same as or an
1284 * ancestor of the class loader for the current class and
1285 * invocation of {@link SecurityManager#checkPackageAccess
1286 * s.checkPackageAccess()} denies access to the package
1287 * of this class
1288 *
1289 * </ul>
1290 *
1291 * @since JDK1.1
1292 */
1293 public Class<?>[] getClasses() {
1294 // be very careful not to change the stack depth of this
1295 // checkMemberAccess call for security reasons
1296 // see java.lang.SecurityManager.checkMemberAccess
1297 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1298
1299 // Privileged so this implementation can look at DECLARED classes,
1300 // something the caller might not have privilege to do. The code here
1301 // is allowed to look at DECLARED classes because (1) it does not hand
1302 // out anything other than public members and (2) public member access
1303 // has already been ok'd by the SecurityManager.
1304
1305 return java.security.AccessController.doPrivileged(
1306 new java.security.PrivilegedAction<Class[]>() {
1307 public Class[] run() {
1308 List<Class> list = new ArrayList<Class>();
1309 Class currentClass = Class.this;
1310 while (currentClass != null) {
1311 Class[] members = currentClass.getDeclaredClasses();
1312 for (int i = 0; i < members.length; i++) {
1313 if (Modifier.isPublic(members[i].getModifiers())) {
1314 list.add(members[i]);
1315 }
1316 }
1317 currentClass = currentClass.getSuperclass();
1318 }
1319 return list.toArray(new Class[0]);
1320 }
1321 });
1322 }
1323
1324
1325 /**
1326 * Returns an array containing {@code Field} objects reflecting all
1327 * the accessible public fields of the class or interface represented by
1328 * this {@code Class} object. The elements in the array returned are
1329 * not sorted and are not in any particular order. This method returns an
1330 * array of length 0 if the class or interface has no accessible public
1331 * fields, or if it represents an array class, a primitive type, or void.
1332 *
1333 * <p> Specifically, if this {@code Class} object represents a class,
1334 * this method returns the public fields of this class and of all its
1335 * superclasses. If this {@code Class} object represents an
1336 * interface, this method returns the fields of this interface and of all
1337 * its superinterfaces.
1338 *
1339 * <p> The implicit length field for array class is not reflected by this
1340 * method. User code should use the methods of class {@code Array} to
1341 * manipulate arrays.
1342 *
1343 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
1344 *
1345 * @return the array of {@code Field} objects representing the
1346 * public fields
1347 * @exception SecurityException
1348 * If a security manager, <i>s</i>, is present and any of the
1349 * following conditions is met:
1350 *
1351 * <ul>
1352 *
1353 * <li> invocation of
1354 * {@link SecurityManager#checkMemberAccess
1355 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1356 * access to the fields within this class
1357 *
1358 * <li> the caller's class loader is not the same as or an
1359 * ancestor of the class loader for the current class and
1360 * invocation of {@link SecurityManager#checkPackageAccess
1361 * s.checkPackageAccess()} denies access to the package
1362 * of this class
1363 *
1364 * </ul>
1365 *
1366 * @since JDK1.1
1367 */
1368 public Field[] getFields() throws SecurityException {
1369 // be very careful not to change the stack depth of this
1370 // checkMemberAccess call for security reasons
1371 // see java.lang.SecurityManager.checkMemberAccess
1372 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1373 return copyFields(privateGetPublicFields(null));
1374 }
1375
1376
1377 /**
1378 * Returns an array containing {@code Method} objects reflecting all
1379 * the public <em>member</em> methods of the class or interface represented
1380 * by this {@code Class} object, including those declared by the class
1381 * or interface and those inherited from superclasses and
1382 * superinterfaces. Array classes return all the (public) member methods
1383 * inherited from the {@code Object} class. The elements in the array
1384 * returned are not sorted and are not in any particular order. This
1385 * method returns an array of length 0 if this {@code Class} object
1386 * represents a class or interface that has no public member methods, or if
1387 * this {@code Class} object represents a primitive type or void.
1388 *
1389 * <p> The class initialization method {@code <clinit>} is not
1390 * included in the returned array. If the class declares multiple public
1391 * member methods with the same parameter types, they are all included in
1392 * the returned array.
1393 *
1394 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
1395 *
1396 * @return the array of {@code Method} objects representing the
1397 * public methods of this class
1398 * @exception SecurityException
1399 * If a security manager, <i>s</i>, is present and any of the
1400 * following conditions is met:
1401 *
1402 * <ul>
1403 *
1404 * <li> invocation of
1405 * {@link SecurityManager#checkMemberAccess
1406 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1407 * access to the methods within this class
1408 *
1409 * <li> the caller's class loader is not the same as or an
1410 * ancestor of the class loader for the current class and
1411 * invocation of {@link SecurityManager#checkPackageAccess
1412 * s.checkPackageAccess()} denies access to the package
1413 * of this class
1414 *
1415 * </ul>
1416 *
1417 * @since JDK1.1
1418 */
1419 public Method[] getMethods() throws SecurityException {
1420 // be very careful not to change the stack depth of this
1421 // checkMemberAccess call for security reasons
1422 // see java.lang.SecurityManager.checkMemberAccess
1423 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1424 return copyMethods(privateGetPublicMethods());
1425 }
1426
1427
1428 /**
1429 * Returns an array containing {@code Constructor} objects reflecting
1430 * all the public constructors of the class represented by this
1431 * {@code Class} object. An array of length 0 is returned if the
1432 * class has no public constructors, or if the class is an array class, or
1433 * if the class reflects a primitive type or void.
1434 *
1435 * Note that while this method returns an array of {@code
1436 * Constructor<T>} objects (that is an array of constructors from
1437 * this class), the return type of this method is {@code
1438 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1439 * might be expected. This less informative return type is
1440 * necessary since after being returned from this method, the
1441 * array could be modified to hold {@code Constructor} objects for
1442 * different classes, which would violate the type guarantees of
1443 * {@code Constructor<T>[]}.
1444 *
1445 * @return the array of {@code Constructor} objects representing the
1446 * public constructors of this class
1447 * @exception SecurityException
1448 * If a security manager, <i>s</i>, is present and any of the
1449 * following conditions is met:
1450 *
1451 * <ul>
1452 *
1453 * <li> invocation of
1454 * {@link SecurityManager#checkMemberAccess
1455 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1456 * access to the constructors within this class
1457 *
1458 * <li> the caller's class loader is not the same as or an
1459 * ancestor of the class loader for the current class and
1460 * invocation of {@link SecurityManager#checkPackageAccess
1461 * s.checkPackageAccess()} denies access to the package
1462 * of this class
1463 *
1464 * </ul>
1465 *
1466 * @since JDK1.1
1467 */
1468 public Constructor<?>[] getConstructors() throws SecurityException {
1469 // be very careful not to change the stack depth of this
1470 // checkMemberAccess call for security reasons
1471 // see java.lang.SecurityManager.checkMemberAccess
1472 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1473 return copyConstructors(privateGetDeclaredConstructors(true));
1474 }
1475
1476
1477 /**
1478 * Returns a {@code Field} object that reflects the specified public
1479 * member field of the class or interface represented by this
1480 * {@code Class} object. The {@code name} parameter is a
1481 * {@code String} specifying the simple name of the desired field.
1482 *
1483 * <p> The field to be reflected is determined by the algorithm that
1484 * follows. Let C be the class represented by this object:
1485 * <OL>
1486 * <LI> If C declares a public field with the name specified, that is the
1487 * field to be reflected.</LI>
1488 * <LI> If no field was found in step 1 above, this algorithm is applied
1489 * recursively to each direct superinterface of C. The direct
1490 * superinterfaces are searched in the order they were declared.</LI>
1491 * <LI> If no field was found in steps 1 and 2 above, and C has a
1492 * superclass S, then this algorithm is invoked recursively upon S.
1493 * If C has no superclass, then a {@code NoSuchFieldException}
1494 * is thrown.</LI>
1495 * </OL>
1496 *
1497 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
1498 *
1499 * @param name the field name
1500 * @return the {@code Field} object of this class specified by
1501 * {@code name}
1502 * @exception NoSuchFieldException if a field with the specified name is
1503 * not found.
1504 * @exception NullPointerException if {@code name} is {@code null}
1505 * @exception SecurityException
1506 * If a security manager, <i>s</i>, is present and any of the
1507 * following conditions is met:
1508 *
1509 * <ul>
1510 *
1511 * <li> invocation of
1512 * {@link SecurityManager#checkMemberAccess
1513 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1514 * access to the field
1515 *
1516 * <li> the caller's class loader is not the same as or an
1517 * ancestor of the class loader for the current class and
1518 * invocation of {@link SecurityManager#checkPackageAccess
1519 * s.checkPackageAccess()} denies access to the package
1520 * of this class
1521 *
1522 * </ul>
1523 *
1524 * @since JDK1.1
1525 */
1526 public Field getField(String name)
1527 throws NoSuchFieldException, SecurityException {
1528 // be very careful not to change the stack depth of this
1529 // checkMemberAccess call for security reasons
1530 // see java.lang.SecurityManager.checkMemberAccess
1531 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1532 Field field = getField0(name);
1533 if (field == null) {
1534 throw new NoSuchFieldException(name);
1535 }
1536 return field;
1537 }
1538
1539
1540 /**
1541 * Returns a {@code Method} object that reflects the specified public
1542 * member method of the class or interface represented by this
1543 * {@code Class} object. The {@code name} parameter is a
1544 * {@code String} specifying the simple name of the desired method. The
1545 * {@code parameterTypes} parameter is an array of {@code Class}
1546 * objects that identify the method's formal parameter types, in declared
1547 * order. If {@code parameterTypes} is {@code null}, it is
1548 * treated as if it were an empty array.
1549 *
1550 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
1551 * {@code NoSuchMethodException} is raised. Otherwise, the method to
1552 * be reflected is determined by the algorithm that follows. Let C be the
1553 * class represented by this object:
1554 * <OL>
1555 * <LI> C is searched for any <I>matching methods</I>. If no matching
1556 * method is found, the algorithm of step 1 is invoked recursively on
1557 * the superclass of C.</LI>
1558 * <LI> If no method was found in step 1 above, the superinterfaces of C
1559 * are searched for a matching method. If any such method is found, it
1560 * is reflected.</LI>
1561 * </OL>
1562 *
1563 * To find a matching method in a class C: If C declares exactly one
1564 * public method with the specified name and exactly the same formal
1565 * parameter types, that is the method reflected. If more than one such
1566 * method is found in C, and one of these methods has a return type that is
1567 * more specific than any of the others, that method is reflected;
1568 * otherwise one of the methods is chosen arbitrarily.
1569 *
1570 * <p>Note that there may be more than one matching method in a
1571 * class because while the Java language forbids a class to
1572 * declare multiple methods with the same signature but different
1573 * return types, the Java virtual machine does not. This
1574 * increased flexibility in the virtual machine can be used to
1575 * implement various language features. For example, covariant
1576 * returns can be implemented with {@linkplain
1577 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1578 * method and the method being overridden would have the same
1579 * signature but different return types.
1580 *
1581 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
1582 *
1583 * @param name the name of the method
1584 * @param parameterTypes the list of parameters
1585 * @return the {@code Method} object that matches the specified
1586 * {@code name} and {@code parameterTypes}
1587 * @exception NoSuchMethodException if a matching method is not found
1588 * or if the name is "<init>"or "<clinit>".
1589 * @exception NullPointerException if {@code name} is {@code null}
1590 * @exception SecurityException
1591 * If a security manager, <i>s</i>, is present and any of the
1592 * following conditions is met:
1593 *
1594 * <ul>
1595 *
1596 * <li> invocation of
1597 * {@link SecurityManager#checkMemberAccess
1598 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1599 * access to the method
1600 *
1601 * <li> the caller's class loader is not the same as or an
1602 * ancestor of the class loader for the current class and
1603 * invocation of {@link SecurityManager#checkPackageAccess
1604 * s.checkPackageAccess()} denies access to the package
1605 * of this class
1606 *
1607 * </ul>
1608 *
1609 * @since JDK1.1
1610 */
1611 public Method getMethod(String name, Class<?>... parameterTypes)
1612 throws NoSuchMethodException, SecurityException {
1613 // be very careful not to change the stack depth of this
1614 // checkMemberAccess call for security reasons
1615 // see java.lang.SecurityManager.checkMemberAccess
1616 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1617 Method method = getMethod0(name, parameterTypes);
1618 if (method == null) {
1619 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1620 }
1621 return method;
1622 }
1623
1624
1625 /**
1626 * Returns a {@code Constructor} object that reflects the specified
1627 * public constructor of the class represented by this {@code Class}
1628 * object. The {@code parameterTypes} parameter is an array of
1629 * {@code Class} objects that identify the constructor's formal
1630 * parameter types, in declared order.
1631 *
1632 * If this {@code Class} object represents an inner class
1633 * declared in a non-static context, the formal parameter types
1634 * include the explicit enclosing instance as the first parameter.
1635 *
1636 * <p> The constructor to reflect is the public constructor of the class
1637 * represented by this {@code Class} object whose formal parameter
1638 * types match those specified by {@code parameterTypes}.
1639 *
1640 * @param parameterTypes the parameter array
1641 * @return the {@code Constructor} object of the public constructor that
1642 * matches the specified {@code parameterTypes}
1643 * @exception NoSuchMethodException if a matching method is not found.
1644 * @exception SecurityException
1645 * If a security manager, <i>s</i>, is present and any of the
1646 * following conditions is met:
1647 *
1648 * <ul>
1649 *
1650 * <li> invocation of
1651 * {@link SecurityManager#checkMemberAccess
1652 * s.checkMemberAccess(this, Member.PUBLIC)} denies
1653 * access to the constructor
1654 *
1655 * <li> the caller's class loader is not the same as or an
1656 * ancestor of the class loader for the current class and
1657 * invocation of {@link SecurityManager#checkPackageAccess
1658 * s.checkPackageAccess()} denies access to the package
1659 * of this class
1660 *
1661 * </ul>
1662 *
1663 * @since JDK1.1
1664 */
1665 public Constructor<T> getConstructor(Class<?>... parameterTypes)
1666 throws NoSuchMethodException, SecurityException {
1667 // be very careful not to change the stack depth of this
1668 // checkMemberAccess call for security reasons
1669 // see java.lang.SecurityManager.checkMemberAccess
1670 checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
1671 return getConstructor0(parameterTypes, Member.PUBLIC);
1672 }
1673
1674
1675 /**
1676 * Returns an array of {@code Class} objects reflecting all the
1677 * classes and interfaces declared as members of the class represented by
1678 * this {@code Class} object. This includes public, protected, default
1679 * (package) access, and private classes and interfaces declared by the
1680 * class, but excludes inherited classes and interfaces. This method
1681 * returns an array of length 0 if the class declares no classes or
1682 * interfaces as members, or if this {@code Class} object represents a
1683 * primitive type, an array class, or void.
1684 *
1685 * @return the array of {@code Class} objects representing all the
1686 * declared members of this class
1687 * @exception SecurityException
1688 * If a security manager, <i>s</i>, is present and any of the
1689 * following conditions is met:
1690 *
1691 * <ul>
1692 *
1693 * <li> invocation of
1694 * {@link SecurityManager#checkMemberAccess
1695 * s.checkMemberAccess(this, Member.DECLARED)} denies
1696 * access to the declared classes within this class
1697 *
1698 * <li> the caller's class loader is not the same as or an
1699 * ancestor of the class loader for the current class and
1700 * invocation of {@link SecurityManager#checkPackageAccess
1701 * s.checkPackageAccess()} denies access to the package
1702 * of this class
1703 *
1704 * </ul>
1705 *
1706 * @since JDK1.1
1707 */
1708 public Class<?>[] getDeclaredClasses() throws SecurityException {
1709 // be very careful not to change the stack depth of this
1710 // checkMemberAccess call for security reasons
1711 // see java.lang.SecurityManager.checkMemberAccess
1712 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1713 return getDeclaredClasses0();
1714 }
1715
1716
1717 /**
1718 * Returns an array of {@code Field} objects reflecting all the fields
1719 * declared by the class or interface represented by this
1720 * {@code Class} object. This includes public, protected, default
1721 * (package) access, and private fields, but excludes inherited fields.
1722 * The elements in the array returned are not sorted and are not in any
1723 * particular order. This method returns an array of length 0 if the class
1724 * or interface declares no fields, or if this {@code Class} object
1725 * represents a primitive type, an array class, or void.
1726 *
1727 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
1728 *
1729 * @return the array of {@code Field} objects representing all the
1730 * declared fields of this class
1731 * @exception SecurityException
1732 * If a security manager, <i>s</i>, is present and any of the
1733 * following conditions is met:
1734 *
1735 * <ul>
1736 *
1737 * <li> invocation of
1738 * {@link SecurityManager#checkMemberAccess
1739 * s.checkMemberAccess(this, Member.DECLARED)} denies
1740 * access to the declared fields within this class
1741 *
1742 * <li> the caller's class loader is not the same as or an
1743 * ancestor of the class loader for the current class and
1744 * invocation of {@link SecurityManager#checkPackageAccess
1745 * s.checkPackageAccess()} denies access to the package
1746 * of this class
1747 *
1748 * </ul>
1749 *
1750 * @since JDK1.1
1751 */
1752 public Field[] getDeclaredFields() throws SecurityException {
1753 // be very careful not to change the stack depth of this
1754 // checkMemberAccess call for security reasons
1755 // see java.lang.SecurityManager.checkMemberAccess
1756 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1757 return copyFields(privateGetDeclaredFields(false));
1758 }
1759
1760
1761 /**
1762 * Returns an array of {@code Method} objects reflecting all the
1763 * methods declared by the class or interface represented by this
1764 * {@code Class} object. This includes public, protected, default
1765 * (package) access, and private methods, but excludes inherited methods.
1766 * The elements in the array returned are not sorted and are not in any
1767 * particular order. This method returns an array of length 0 if the class
1768 * or interface declares no methods, or if this {@code Class} object
1769 * represents a primitive type, an array class, or void. The class
1770 * initialization method {@code <clinit>} is not included in the
1771 * returned array. If the class declares multiple public member methods
1772 * with the same parameter types, they are all included in the returned
1773 * array.
1774 *
1775 * <p> See <em>The Java Language Specification</em>, section 8.2.
1776 *
1777 * @return the array of {@code Method} objects representing all the
1778 * declared methods of this class
1779 * @exception SecurityException
1780 * If a security manager, <i>s</i>, is present and any of the
1781 * following conditions is met:
1782 *
1783 * <ul>
1784 *
1785 * <li> invocation of
1786 * {@link SecurityManager#checkMemberAccess
1787 * s.checkMemberAccess(this, Member.DECLARED)} denies
1788 * access to the declared methods within this class
1789 *
1790 * <li> the caller's class loader is not the same as or an
1791 * ancestor of the class loader for the current class and
1792 * invocation of {@link SecurityManager#checkPackageAccess
1793 * s.checkPackageAccess()} denies access to the package
1794 * of this class
1795 *
1796 * </ul>
1797 *
1798 * @since JDK1.1
1799 */
1800 public Method[] getDeclaredMethods() throws SecurityException {
1801 // be very careful not to change the stack depth of this
1802 // checkMemberAccess call for security reasons
1803 // see java.lang.SecurityManager.checkMemberAccess
1804 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1805 return copyMethods(privateGetDeclaredMethods(false));
1806 }
1807
1808
1809 /**
1810 * Returns an array of {@code Constructor} objects reflecting all the
1811 * constructors declared by the class represented by this
1812 * {@code Class} object. These are public, protected, default
1813 * (package) access, and private constructors. The elements in the array
1814 * returned are not sorted and are not in any particular order. If the
1815 * class has a default constructor, it is included in the returned array.
1816 * This method returns an array of length 0 if this {@code Class}
1817 * object represents an interface, a primitive type, an array class, or
1818 * void.
1819 *
1820 * <p> See <em>The Java Language Specification</em>, section 8.2.
1821 *
1822 * @return the array of {@code Constructor} objects representing all the
1823 * declared constructors of this class
1824 * @exception SecurityException
1825 * If a security manager, <i>s</i>, is present and any of the
1826 * following conditions is met:
1827 *
1828 * <ul>
1829 *
1830 * <li> invocation of
1831 * {@link SecurityManager#checkMemberAccess
1832 * s.checkMemberAccess(this, Member.DECLARED)} denies
1833 * access to the declared constructors within this class
1834 *
1835 * <li> the caller's class loader is not the same as or an
1836 * ancestor of the class loader for the current class and
1837 * invocation of {@link SecurityManager#checkPackageAccess
1838 * s.checkPackageAccess()} denies access to the package
1839 * of this class
1840 *
1841 * </ul>
1842 *
1843 * @since JDK1.1
1844 */
1845 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
1846 // be very careful not to change the stack depth of this
1847 // checkMemberAccess call for security reasons
1848 // see java.lang.SecurityManager.checkMemberAccess
1849 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1850 return copyConstructors(privateGetDeclaredConstructors(false));
1851 }
1852
1853
1854 /**
1855 * Returns a {@code Field} object that reflects the specified declared
1856 * field of the class or interface represented by this {@code Class}
1857 * object. The {@code name} parameter is a {@code String} that
1858 * specifies the simple name of the desired field. Note that this method
1859 * will not reflect the {@code length} field of an array class.
1860 *
1861 * @param name the name of the field
1862 * @return the {@code Field} object for the specified field in this
1863 * class
1864 * @exception NoSuchFieldException if a field with the specified name is
1865 * not found.
1866 * @exception NullPointerException if {@code name} is {@code null}
1867 * @exception SecurityException
1868 * If a security manager, <i>s</i>, is present and any of the
1869 * following conditions is met:
1870 *
1871 * <ul>
1872 *
1873 * <li> invocation of
1874 * {@link SecurityManager#checkMemberAccess
1875 * s.checkMemberAccess(this, Member.DECLARED)} denies
1876 * access to the declared field
1877 *
1878 * <li> the caller's class loader is not the same as or an
1879 * ancestor of the class loader for the current class and
1880 * invocation of {@link SecurityManager#checkPackageAccess
1881 * s.checkPackageAccess()} denies access to the package
1882 * of this class
1883 *
1884 * </ul>
1885 *
1886 * @since JDK1.1
1887 */
1888 public Field getDeclaredField(String name)
1889 throws NoSuchFieldException, SecurityException {
1890 // be very careful not to change the stack depth of this
1891 // checkMemberAccess call for security reasons
1892 // see java.lang.SecurityManager.checkMemberAccess
1893 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1894 Field field = searchFields(privateGetDeclaredFields(false), name);
1895 if (field == null) {
1896 throw new NoSuchFieldException(name);
1897 }
1898 return field;
1899 }
1900
1901
1902 /**
1903 * Returns a {@code Method} object that reflects the specified
1904 * declared method of the class or interface represented by this
1905 * {@code Class} object. The {@code name} parameter is a
1906 * {@code String} that specifies the simple name of the desired
1907 * method, and the {@code parameterTypes} parameter is an array of
1908 * {@code Class} objects that identify the method's formal parameter
1909 * types, in declared order. If more than one method with the same
1910 * parameter types is declared in a class, and one of these methods has a
1911 * return type that is more specific than any of the others, that method is
1912 * returned; otherwise one of the methods is chosen arbitrarily. If the
1913 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
1914 * is raised.
1915 *
1916 * @param name the name of the method
1917 * @param parameterTypes the parameter array
1918 * @return the {@code Method} object for the method of this class
1919 * matching the specified name and parameters
1920 * @exception NoSuchMethodException if a matching method is not found.
1921 * @exception NullPointerException if {@code name} is {@code null}
1922 * @exception SecurityException
1923 * If a security manager, <i>s</i>, is present and any of the
1924 * following conditions is met:
1925 *
1926 * <ul>
1927 *
1928 * <li> invocation of
1929 * {@link SecurityManager#checkMemberAccess
1930 * s.checkMemberAccess(this, Member.DECLARED)} denies
1931 * access to the declared method
1932 *
1933 * <li> the caller's class loader is not the same as or an
1934 * ancestor of the class loader for the current class and
1935 * invocation of {@link SecurityManager#checkPackageAccess
1936 * s.checkPackageAccess()} denies access to the package
1937 * of this class
1938 *
1939 * </ul>
1940 *
1941 * @since JDK1.1
1942 */
1943 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
1944 throws NoSuchMethodException, SecurityException {
1945 // be very careful not to change the stack depth of this
1946 // checkMemberAccess call for security reasons
1947 // see java.lang.SecurityManager.checkMemberAccess
1948 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1949 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
1950 if (method == null) {
1951 throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
1952 }
1953 return method;
1954 }
1955
1956
1957 /**
1958 * Returns a {@code Constructor} object that reflects the specified
1959 * constructor of the class or interface represented by this
1960 * {@code Class} object. The {@code parameterTypes} parameter is
1961 * an array of {@code Class} objects that identify the constructor's
1962 * formal parameter types, in declared order.
1963 *
1964 * If this {@code Class} object represents an inner class
1965 * declared in a non-static context, the formal parameter types
1966 * include the explicit enclosing instance as the first parameter.
1967 *
1968 * @param parameterTypes the parameter array
1969 * @return The {@code Constructor} object for the constructor with the
1970 * specified parameter list
1971 * @exception NoSuchMethodException if a matching method is not found.
1972 * @exception SecurityException
1973 * If a security manager, <i>s</i>, is present and any of the
1974 * following conditions is met:
1975 *
1976 * <ul>
1977 *
1978 * <li> invocation of
1979 * {@link SecurityManager#checkMemberAccess
1980 * s.checkMemberAccess(this, Member.DECLARED)} denies
1981 * access to the declared constructor
1982 *
1983 * <li> the caller's class loader is not the same as or an
1984 * ancestor of the class loader for the current class and
1985 * invocation of {@link SecurityManager#checkPackageAccess
1986 * s.checkPackageAccess()} denies access to the package
1987 * of this class
1988 *
1989 * </ul>
1990 *
1991 * @since JDK1.1
1992 */
1993 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
1994 throws NoSuchMethodException, SecurityException {
1995 // be very careful not to change the stack depth of this
1996 // checkMemberAccess call for security reasons
1997 // see java.lang.SecurityManager.checkMemberAccess
1998 checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
1999 return getConstructor0(parameterTypes, Member.DECLARED);
2000 }
2001
2002 /**
2003 * Finds a resource with a given name. The rules for searching resources
2004 * associated with a given class are implemented by the defining
2005 * {@linkplain ClassLoader class loader} of the class. This method
2006 * delegates to this object's class loader. If this object was loaded by
2007 * the bootstrap class loader, the method delegates to {@link
2008 * ClassLoader#getSystemResourceAsStream}.
2009 *
2010 * <p> Before delegation, an absolute resource name is constructed from the
2011 * given resource name using this algorithm:
2012 *
2013 * <ul>
2014 *
2015 * <li> If the {@code name} begins with a {@code '/'}
2016 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2017 * portion of the {@code name} following the {@code '/'}.
2018 *
2019 * <li> Otherwise, the absolute name is of the following form:
2020 *
2021 * <blockquote>
2022 * {@code modified_package_name/name}
2023 * </blockquote>
2024 *
2025 * <p> Where the {@code modified_package_name} is the package name of this
2026 * object with {@code '/'} substituted for {@code '.'}
2027 * (<tt>'\u002e'</tt>).
2028 *
2029 * </ul>
2030 *
2031 * @param name name of the desired resource
2032 * @return A {@link java.io.InputStream} object or {@code null} if
2033 * no resource with this name is found
2034 * @throws NullPointerException If {@code name} is {@code null}
2035 * @since JDK1.1
2036 */
2037 public InputStream getResourceAsStream(String name) {
2038 name = resolveName(name);
2039 ClassLoader cl = getClassLoader0();
2040 if (cl==null) {
2041 // A system class.
2042 return ClassLoader.getSystemResourceAsStream(name);
2043 }
2044 return cl.getResourceAsStream(name);
2045 }
2046
2047 /**
2048 * Finds a resource with a given name. The rules for searching resources
2049 * associated with a given class are implemented by the defining
2050 * {@linkplain ClassLoader class loader} of the class. This method
2051 * delegates to this object's class loader. If this object was loaded by
2052 * the bootstrap class loader, the method delegates to {@link
2053 * ClassLoader#getSystemResource}.
2054 *
2055 * <p> Before delegation, an absolute resource name is constructed from the
2056 * given resource name using this algorithm:
2057 *
2058 * <ul>
2059 *
2060 * <li> If the {@code name} begins with a {@code '/'}
2061 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
2062 * portion of the {@code name} following the {@code '/'}.
2063 *
2064 * <li> Otherwise, the absolute name is of the following form:
2065 *
2066 * <blockquote>
2067 * {@code modified_package_name/name}
2068 * </blockquote>
2069 *
2070 * <p> Where the {@code modified_package_name} is the package name of this
2071 * object with {@code '/'} substituted for {@code '.'}
2072 * (<tt>'\u002e'</tt>).
2073 *
2074 * </ul>
2075 *
2076 * @param name name of the desired resource
2077 * @return A {@link java.net.URL} object or {@code null} if no
2078 * resource with this name is found
2079 * @since JDK1.1
2080 */
2081 public java.net.URL getResource(String name) {
2082 name = resolveName(name);
2083 ClassLoader cl = getClassLoader0();
2084 if (cl==null) {
2085 // A system class.
2086 return ClassLoader.getSystemResource(name);
2087 }
2088 return cl.getResource(name);
2089 }
2090
2091
2092
2093 /** protection domain returned when the internal domain is null */
2094 private static java.security.ProtectionDomain allPermDomain;
2095
2096
2097 /**
2098 * Returns the {@code ProtectionDomain} of this class. If there is a
2099 * security manager installed, this method first calls the security
2100 * manager's {@code checkPermission} method with a
2101 * {@code RuntimePermission("getProtectionDomain")} permission to
2102 * ensure it's ok to get the
2103 * {@code ProtectionDomain}.
2104 *
2105 * @return the ProtectionDomain of this class
2106 *
2107 * @throws SecurityException
2108 * if a security manager exists and its
2109 * {@code checkPermission} method doesn't allow
2110 * getting the ProtectionDomain.
2111 *
2112 * @see java.security.ProtectionDomain
2113 * @see SecurityManager#checkPermission
2114 * @see java.lang.RuntimePermission
2115 * @since 1.2
2116 */
2117 public java.security.ProtectionDomain getProtectionDomain() {
2118 SecurityManager sm = System.getSecurityManager();
2119 if (sm != null) {
2120 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2121 }
2122 java.security.ProtectionDomain pd = getProtectionDomain0();
2123 if (pd == null) {
2124 if (
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