1 /*
2 * Copyright (c) 1994, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang;
27
28 import java.lang.annotation.Annotation;
29 import java.lang.module.ModuleReader;
30 import java.lang.ref.SoftReference;
31 import java.io.IOException;
32 import java.io.InputStream;
33 import java.io.ObjectStreamField;
34 import java.lang.reflect.AnnotatedElement;
35 import java.lang.reflect.AnnotatedType;
36 import java.lang.reflect.Array;
37 import java.lang.reflect.Constructor;
38 import java.lang.reflect.Executable;
39 import java.lang.reflect.Field;
40 import java.lang.reflect.GenericArrayType;
41 import java.lang.reflect.GenericDeclaration;
42 import java.lang.reflect.InvocationTargetException;
43 import java.lang.reflect.Member;
44 import java.lang.reflect.Method;
45 import java.lang.reflect.Modifier;
46 import java.lang.reflect.Proxy;
47 import java.lang.reflect.Type;
48 import java.lang.reflect.TypeVariable;
49 import java.net.URL;
50 import java.security.AccessController;
51 import java.security.PrivilegedAction;
52 import java.util.ArrayList;
53 import java.util.Arrays;
54 import java.util.Collection;
55 import java.util.HashMap;
56 import java.util.LinkedHashMap;
57 import java.util.LinkedHashSet;
58 import java.util.List;
59 import java.util.Map;
60 import java.util.Objects;
61 import java.util.StringJoiner;
62 import java.util.stream.Stream;
63 import java.util.stream.Collectors;
64
65 import jdk.internal.HotSpotIntrinsicCandidate;
66 import jdk.internal.loader.BootLoader;
67 import jdk.internal.loader.BuiltinClassLoader;
68 import jdk.internal.misc.Unsafe;
69 import jdk.internal.module.Resources;
70 import jdk.internal.reflect.CallerSensitive;
71 import jdk.internal.reflect.ConstantPool;
72 import jdk.internal.reflect.Reflection;
73 import jdk.internal.reflect.ReflectionFactory;
74 import jdk.internal.vm.annotation.ForceInline;
75 import sun.reflect.generics.factory.CoreReflectionFactory;
76 import sun.reflect.generics.factory.GenericsFactory;
77 import sun.reflect.generics.repository.ClassRepository;
78 import sun.reflect.generics.repository.MethodRepository;
79 import sun.reflect.generics.repository.ConstructorRepository;
80 import sun.reflect.generics.scope.ClassScope;
81 import sun.security.util.SecurityConstants;
82 import sun.reflect.annotation.*;
83 import sun.reflect.misc.ReflectUtil;
84
85 /**
86 * Instances of the class {@code Class} represent classes and interfaces
87 * in a running Java application. An enum type is a kind of class and an
88 * annotation type is a kind of interface. Every array also
89 * belongs to a class that is reflected as a {@code Class} object
90 * that is shared by all arrays with the same element type and number
91 * of dimensions. The primitive Java types ({@code boolean},
92 * {@code byte}, {@code char}, {@code short},
93 * {@code int}, {@code long}, {@code float}, and
94 * {@code double}), and the keyword {@code void} are also
95 * represented as {@code Class} objects.
96 *
97 * <p> {@code Class} has no public constructor. Instead a {@code Class}
98 * object is constructed automatically by the Java Virtual Machine
99 * when a class loader invokes one of the
100 * {@link ClassLoader#defineClass(String,byte[], int,int) defineClass} methods
101 * and passes the bytes of a {@code class} file.
102 *
103 * <p> The methods of class {@code Class} expose many characteristics of a
104 * class or interface. Most characteristics are derived from the {@code class}
105 * file that the class loader passed to the Java Virtual Machine. A few
106 * characteristics are determined by the class loading environment at run time,
107 * such as the module returned by {@link #getModule() getModule()}.
108 *
109 * <p> Some methods of class {@code Class} expose whether the declaration of
110 * a class or interface in Java source code was <em>enclosed</em> within
111 * another declaration. Other methods describe how a class or interface
112 * is situated in a <em>nest</em>. A <a id="nest">nest</a> is a set of
113 * classes and interfaces, in the same run-time package, that
114 * allow mutual access to their {@code private} members.
115 * The classes and interfaces are known as <em>nestmates</em>.
116 * One nestmate acts as the
117 * <em>nest host</em>, and enumerates the other nestmates which
118 * belong to the nest; each of them in turn records it as the nest host.
119 * The classes and interfaces which belong to a nest, including its host, are
120 * determined when
121 * {@code class} files are generated, for example, a Java compiler
122 * will typically record a top-level class as the host of a nest where the
123 * other members are the classes and interfaces whose declarations are
124 * enclosed within the top-level class declaration.
125 *
126 * <p> The following example uses a {@code Class} object to print the
127 * class name of an object:
128 *
129 * <blockquote><pre>
130 * void printClassName(Object obj) {
131 * System.out.println("The class of " + obj +
132 * " is " + obj.getClass().getName());
133 * }
134 * </pre></blockquote>
135 *
136 * <p> It is also possible to get the {@code Class} object for a named
137 * type (or for void) using a class literal. See Section 15.8.2 of
138 * <cite>The Java™ Language Specification</cite>.
139 * For example:
140 *
141 * <blockquote>
142 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
143 * </blockquote>
144 *
145 * @param <T> the type of the class modeled by this {@code Class}
146 * object. For example, the type of {@code String.class} is {@code
147 * Class<String>}. Use {@code Class<?>} if the class being modeled is
148 * unknown.
149 *
150 * @author unascribed
151 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
152 * @since 1.0
153 */
154 public final class Class<T> implements java.io.Serializable,
155 GenericDeclaration,
156 Type,
157 AnnotatedElement {
158 private static final int ANNOTATION= 0x00002000;
159 private static final int ENUM = 0x00004000;
160 private static final int SYNTHETIC = 0x00001000;
161
162 private static native void registerNatives();
163 static {
164 registerNatives();
165 }
166
167 /*
168 * Private constructor. Only the Java Virtual Machine creates Class objects.
169 * This constructor is not used and prevents the default constructor being
170 * generated.
171 */
172 private Class(ClassLoader loader, Class<?> arrayComponentType) {
173 // Initialize final field for classLoader. The initialization value of non-null
174 // prevents future JIT optimizations from assuming this final field is null.
175 classLoader = loader;
176 componentType = arrayComponentType;
177 }
178
179 /**
180 * Converts the object to a string. The string representation is the
181 * string "class" or "interface", followed by a space, and then by the
182 * fully qualified name of the class in the format returned by
183 * {@code getName}. If this {@code Class} object represents a
184 * primitive type, this method returns the name of the primitive type. If
185 * this {@code Class} object represents void this method returns
186 * "void". If this {@code Class} object represents an array type,
187 * this method returns "class " followed by {@code getName}.
188 *
189 * @return a string representation of this class object.
190 */
191 public String toString() {
192 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
193 + getName();
194 }
195
196 /**
197 * Returns a string describing this {@code Class}, including
198 * information about modifiers and type parameters.
199 *
200 * The string is formatted as a list of type modifiers, if any,
201 * followed by the kind of type (empty string for primitive types
202 * and {@code class}, {@code enum}, {@code interface}, or
203 * <code>@</code>{@code interface}, as appropriate), followed
204 * by the type's name, followed by an angle-bracketed
205 * comma-separated list of the type's type parameters, if any,
206 * including informative bounds on the type parameters, if any.
207 *
208 * A space is used to separate modifiers from one another and to
209 * separate any modifiers from the kind of type. The modifiers
210 * occur in canonical order. If there are no type parameters, the
211 * type parameter list is elided.
212 *
213 * For an array type, the string starts with the type name,
214 * followed by an angle-bracketed comma-separated list of the
215 * type's type parameters, if any, followed by a sequence of
216 * {@code []} characters, one set of brackets per dimension of
217 * the array.
218 *
219 * <p>Note that since information about the runtime representation
220 * of a type is being generated, modifiers not present on the
221 * originating source code or illegal on the originating source
222 * code may be present.
223 *
224 * @return a string describing this {@code Class}, including
225 * information about modifiers and type parameters
226 *
227 * @since 1.8
228 */
229 public String toGenericString() {
230 if (isPrimitive()) {
231 return toString();
232 } else {
233 StringBuilder sb = new StringBuilder();
234 Class<?> component = this;
235 int arrayDepth = 0;
236
237 if (isArray()) {
238 do {
239 arrayDepth++;
240 component = component.getComponentType();
241 } while (component.isArray());
242 sb.append(component.getName());
243 } else {
244 // Class modifiers are a superset of interface modifiers
245 int modifiers = getModifiers() & Modifier.classModifiers();
246 if (modifiers != 0) {
247 sb.append(Modifier.toString(modifiers));
248 sb.append(' ');
249 }
250
251 if (isAnnotation()) {
252 sb.append('@');
253 }
254 if (isInterface()) { // Note: all annotation types are interfaces
255 sb.append("interface");
256 } else {
257 if (isEnum())
258 sb.append("enum");
259 else
260 sb.append("class");
261 }
262 sb.append(' ');
263 sb.append(getName());
264 }
265
266 TypeVariable<?>[] typeparms = component.getTypeParameters();
267 if (typeparms.length > 0) {
268 sb.append(Stream.of(typeparms).map(t -> typeVarBounds(t)).
269 collect(Collectors.joining(",", "<", ">")));
270 }
271
272 for (int i = 0; i < arrayDepth; i++)
273 sb.append("[]");
274
275 return sb.toString();
276 }
277 }
278
279 String typeVarBounds(TypeVariable<?> typeVar) {
280 Type[] bounds = typeVar.getBounds();
281 if (bounds.length == 1 && bounds[0].equals(Object.class)) {
282 return typeVar.getName();
283 } else {
284 return typeVar.getName() + " extends " +
285 Stream.of(bounds).map(e -> e.getTypeName()).
286 collect(Collectors.joining(" & "));
287 }
288 }
289
290 /**
291 * Returns the {@code Class} object associated with the class or
292 * interface with the given string name. Invoking this method is
293 * equivalent to:
294 *
295 * <blockquote>
296 * {@code Class.forName(className, true, currentLoader)}
297 * </blockquote>
298 *
299 * where {@code currentLoader} denotes the defining class loader of
300 * the current class.
301 *
302 * <p> For example, the following code fragment returns the
303 * runtime {@code Class} descriptor for the class named
304 * {@code java.lang.Thread}:
305 *
306 * <blockquote>
307 * {@code Class t = Class.forName("java.lang.Thread")}
308 * </blockquote>
309 * <p>
310 * A call to {@code forName("X")} causes the class named
311 * {@code X} to be initialized.
312 *
313 * @param className the fully qualified name of the desired class.
314 * @return the {@code Class} object for the class with the
315 * specified name.
316 * @exception LinkageError if the linkage fails
317 * @exception ExceptionInInitializerError if the initialization provoked
318 * by this method fails
319 * @exception ClassNotFoundException if the class cannot be located
320 */
321 @CallerSensitive
322 public static Class<?> forName(String className)
323 throws ClassNotFoundException {
324 Class<?> caller = Reflection.getCallerClass();
325 return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
326 }
327
328
329 /**
330 * Returns the {@code Class} object associated with the class or
331 * interface with the given string name, using the given class loader.
332 * Given the fully qualified name for a class or interface (in the same
333 * format returned by {@code getName}) this method attempts to
334 * locate, load, and link the class or interface. The specified class
335 * loader is used to load the class or interface. If the parameter
336 * {@code loader} is null, the class is loaded through the bootstrap
337 * class loader. The class is initialized only if the
338 * {@code initialize} parameter is {@code true} and if it has
339 * not been initialized earlier.
340 *
341 * <p> If {@code name} denotes a primitive type or void, an attempt
342 * will be made to locate a user-defined class in the unnamed package whose
343 * name is {@code name}. Therefore, this method cannot be used to
344 * obtain any of the {@code Class} objects representing primitive
345 * types or void.
346 *
347 * <p> If {@code name} denotes an array class, the component type of
348 * the array class is loaded but not initialized.
349 *
350 * <p> For example, in an instance method the expression:
351 *
352 * <blockquote>
353 * {@code Class.forName("Foo")}
354 * </blockquote>
355 *
356 * is equivalent to:
357 *
358 * <blockquote>
359 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
360 * </blockquote>
361 *
362 * Note that this method throws errors related to loading, linking or
363 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
364 * Java Language Specification</em>.
365 * Note that this method does not check whether the requested class
366 * is accessible to its caller.
367 *
368 * @param name fully qualified name of the desired class
369 * @param initialize if {@code true} the class will be initialized.
370 * See Section 12.4 of <em>The Java Language Specification</em>.
371 * @param loader class loader from which the class must be loaded
372 * @return class object representing the desired class
373 *
374 * @exception LinkageError if the linkage fails
375 * @exception ExceptionInInitializerError if the initialization provoked
376 * by this method fails
377 * @exception ClassNotFoundException if the class cannot be located by
378 * the specified class loader
379 * @exception SecurityException
380 * if a security manager is present, and the {@code loader} is
381 * {@code null}, and the caller's class loader is not
382 * {@code null}, and the caller does not have the
383 * {@link RuntimePermission}{@code ("getClassLoader")}
384 *
385 * @see java.lang.Class#forName(String)
386 * @see java.lang.ClassLoader
387 * @since 1.2
388 */
389 @CallerSensitive
390 public static Class<?> forName(String name, boolean initialize,
391 ClassLoader loader)
392 throws ClassNotFoundException
393 {
394 Class<?> caller = null;
395 SecurityManager sm = System.getSecurityManager();
396 if (sm != null) {
397 // Reflective call to get caller class is only needed if a security manager
398 // is present. Avoid the overhead of making this call otherwise.
399 caller = Reflection.getCallerClass();
400 if (loader == null) {
401 ClassLoader ccl = ClassLoader.getClassLoader(caller);
402 if (ccl != null) {
403 sm.checkPermission(
404 SecurityConstants.GET_CLASSLOADER_PERMISSION);
405 }
406 }
407 }
408 return forName0(name, initialize, loader, caller);
409 }
410
411 /** Called after security check for system loader access checks have been made. */
412 private static native Class<?> forName0(String name, boolean initialize,
413 ClassLoader loader,
414 Class<?> caller)
415 throws ClassNotFoundException;
416
417
418 /**
419 * Returns the {@code Class} with the given <a href="ClassLoader.html#name">
420 * binary name</a> in the given module.
421 *
422 * <p> This method attempts to locate, load, and link the class or interface.
423 * It does not run the class initializer. If the class is not found, this
424 * method returns {@code null}. </p>
425 *
426 * <p> If the class loader of the given module defines other modules and
427 * the given name is a class defined in a different module, this method
428 * returns {@code null} after the class is loaded. </p>
429 *
430 * <p> This method does not check whether the requested class is
431 * accessible to its caller. </p>
432 *
433 * @apiNote
434 * This method returns {@code null} on failure rather than
435 * throwing a {@link ClassNotFoundException}, as is done by
436 * the {@link #forName(String, boolean, ClassLoader)} method.
437 * The security check is a stack-based permission check if the caller
438 * loads a class in another module.
439 *
440 * @param module A module
441 * @param name The <a href="ClassLoader.html#name">binary name</a>
442 * of the class
443 * @return {@code Class} object of the given name defined in the given module;
444 * {@code null} if not found.
445 *
446 * @throws NullPointerException if the given module or name is {@code null}
447 *
448 * @throws LinkageError if the linkage fails
449 *
450 * @throws SecurityException
451 * <ul>
452 * <li> if the caller is not the specified module and
453 * {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
454 * <li> access to the module content is denied. For example,
455 * permission check will be performed when a class loader calls
456 * {@link ModuleReader#open(String)} to read the bytes of a class file
457 * in a module.</li>
458 * </ul>
459 *
460 * @since 9
461 * @spec JPMS
462 */
463 @CallerSensitive
464 public static Class<?> forName(Module module, String name) {
465 Objects.requireNonNull(module);
466 Objects.requireNonNull(name);
467
468 ClassLoader cl;
469 SecurityManager sm = System.getSecurityManager();
470 if (sm != null) {
471 Class<?> caller = Reflection.getCallerClass();
472 if (caller != null && caller.getModule() != module) {
473 // if caller is null, Class.forName is the last java frame on the stack.
474 // java.base has all permissions
475 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
476 }
477 PrivilegedAction<ClassLoader> pa = module::getClassLoader;
478 cl = AccessController.doPrivileged(pa);
479 } else {
480 cl = module.getClassLoader();
481 }
482
483 if (cl != null) {
484 return cl.loadClass(module, name);
485 } else {
486 return BootLoader.loadClass(module, name);
487 }
488 }
489
490 /**
491 * Creates a new instance of the class represented by this {@code Class}
492 * object. The class is instantiated as if by a {@code new}
493 * expression with an empty argument list. The class is initialized if it
494 * has not already been initialized.
495 *
496 * @deprecated This method propagates any exception thrown by the
497 * nullary constructor, including a checked exception. Use of
498 * this method effectively bypasses the compile-time exception
499 * checking that would otherwise be performed by the compiler.
500 * The {@link
501 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
502 * Constructor.newInstance} method avoids this problem by wrapping
503 * any exception thrown by the constructor in a (checked) {@link
504 * java.lang.reflect.InvocationTargetException}.
505 *
506 * <p>The call
507 *
508 * <pre>{@code
509 * clazz.newInstance()
510 * }</pre>
511 *
512 * can be replaced by
513 *
514 * <pre>{@code
515 * clazz.getDeclaredConstructor().newInstance()
516 * }</pre>
517 *
518 * The latter sequence of calls is inferred to be able to throw
519 * the additional exception types {@link
520 * InvocationTargetException} and {@link
521 * NoSuchMethodException}. Both of these exception types are
522 * subclasses of {@link ReflectiveOperationException}.
523 *
524 * @return a newly allocated instance of the class represented by this
525 * object.
526 * @throws IllegalAccessException if the class or its nullary
527 * constructor is not accessible.
528 * @throws InstantiationException
529 * if this {@code Class} represents an abstract class,
530 * an interface, an array class, a primitive type, or void;
531 * or if the class has no nullary constructor;
532 * or if the instantiation fails for some other reason.
533 * @throws ExceptionInInitializerError if the initialization
534 * provoked by this method fails.
535 * @throws SecurityException
536 * If a security manager, <i>s</i>, is present and
537 * the caller's class loader is not the same as or an
538 * ancestor of the class loader for the current class and
539 * invocation of {@link SecurityManager#checkPackageAccess
540 * s.checkPackageAccess()} denies access to the package
541 * of this class.
542 */
543 @CallerSensitive
544 @Deprecated(since="9")
545 public T newInstance()
546 throws InstantiationException, IllegalAccessException
547 {
548 SecurityManager sm = System.getSecurityManager();
549 if (sm != null) {
550 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
551 }
552
553 // Constructor lookup
554 Constructor<T> tmpConstructor = cachedConstructor;
555 if (tmpConstructor == null) {
556 if (this == Class.class) {
557 throw new IllegalAccessException(
558 "Can not call newInstance() on the Class for java.lang.Class"
559 );
560 }
561 try {
562 Class<?>[] empty = {};
563 final Constructor<T> c = getReflectionFactory().copyConstructor(
564 getConstructor0(empty, Member.DECLARED));
565 // Disable accessibility checks on the constructor
566 // access check is done with the true caller
567 java.security.AccessController.doPrivileged(
568 new java.security.PrivilegedAction<>() {
569 public Void run() {
570 c.setAccessible(true);
571 return null;
572 }
573 });
574 cachedConstructor = tmpConstructor = c;
575 } catch (NoSuchMethodException e) {
576 throw (InstantiationException)
577 new InstantiationException(getName()).initCause(e);
578 }
579 }
580
581 try {
582 Class<?> caller = Reflection.getCallerClass();
583 return getReflectionFactory().newInstance(tmpConstructor, null, caller);
584 } catch (InvocationTargetException e) {
585 Unsafe.getUnsafe().throwException(e.getTargetException());
586 // Not reached
587 return null;
588 }
589 }
590
591 private transient volatile Constructor<T> cachedConstructor;
592
593 /**
594 * Determines if the specified {@code Object} is assignment-compatible
595 * with the object represented by this {@code Class}. This method is
596 * the dynamic equivalent of the Java language {@code instanceof}
597 * operator. The method returns {@code true} if the specified
598 * {@code Object} argument is non-null and can be cast to the
599 * reference type represented by this {@code Class} object without
600 * raising a {@code ClassCastException.} It returns {@code false}
601 * otherwise.
602 *
603 * <p> Specifically, if this {@code Class} object represents a
604 * declared class, this method returns {@code true} if the specified
605 * {@code Object} argument is an instance of the represented class (or
606 * of any of its subclasses); it returns {@code false} otherwise. If
607 * this {@code Class} object represents an array class, this method
608 * returns {@code true} if the specified {@code Object} argument
609 * can be converted to an object of the array class by an identity
610 * conversion or by a widening reference conversion; it returns
611 * {@code false} otherwise. If this {@code Class} object
612 * represents an interface, this method returns {@code true} if the
613 * class or any superclass of the specified {@code Object} argument
614 * implements this interface; it returns {@code false} otherwise. If
615 * this {@code Class} object represents a primitive type, this method
616 * returns {@code false}.
617 *
618 * @param obj the object to check
619 * @return true if {@code obj} is an instance of this class
620 *
621 * @since 1.1
622 */
623 @HotSpotIntrinsicCandidate
624 public native boolean isInstance(Object obj);
625
626
627 /**
628 * Determines if the class or interface represented by this
629 * {@code Class} object is either the same as, or is a superclass or
630 * superinterface of, the class or interface represented by the specified
631 * {@code Class} parameter. It returns {@code true} if so;
632 * otherwise it returns {@code false}. If this {@code Class}
633 * object represents a primitive type, this method returns
634 * {@code true} if the specified {@code Class} parameter is
635 * exactly this {@code Class} object; otherwise it returns
636 * {@code false}.
637 *
638 * <p> Specifically, this method tests whether the type represented by the
639 * specified {@code Class} parameter can be converted to the type
640 * represented by this {@code Class} object via an identity conversion
641 * or via a widening reference conversion. See <em>The Java Language
642 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
643 *
644 * @param cls the {@code Class} object to be checked
645 * @return the {@code boolean} value indicating whether objects of the
646 * type {@code cls} can be assigned to objects of this class
647 * @exception NullPointerException if the specified Class parameter is
648 * null.
649 * @since 1.1
650 */
651 @HotSpotIntrinsicCandidate
652 public native boolean isAssignableFrom(Class<?> cls);
653
654
655 /**
656 * Determines if the specified {@code Class} object represents an
657 * interface type.
658 *
659 * @return {@code true} if this object represents an interface;
660 * {@code false} otherwise.
661 */
662 @HotSpotIntrinsicCandidate
663 public native boolean isInterface();
664
665
666 /**
667 * Determines if this {@code Class} object represents an array class.
668 *
669 * @return {@code true} if this object represents an array class;
670 * {@code false} otherwise.
671 * @since 1.1
672 */
673 @HotSpotIntrinsicCandidate
674 public native boolean isArray();
675
676
677 /**
678 * Determines if the specified {@code Class} object represents a
679 * primitive type.
680 *
681 * <p> There are nine predefined {@code Class} objects to represent
682 * the eight primitive types and void. These are created by the Java
683 * Virtual Machine, and have the same names as the primitive types that
684 * they represent, namely {@code boolean}, {@code byte},
685 * {@code char}, {@code short}, {@code int},
686 * {@code long}, {@code float}, and {@code double}.
687 *
688 * <p> These objects may only be accessed via the following public static
689 * final variables, and are the only {@code Class} objects for which
690 * this method returns {@code true}.
691 *
692 * @return true if and only if this class represents a primitive type
693 *
694 * @see java.lang.Boolean#TYPE
695 * @see java.lang.Character#TYPE
696 * @see java.lang.Byte#TYPE
697 * @see java.lang.Short#TYPE
698 * @see java.lang.Integer#TYPE
699 * @see java.lang.Long#TYPE
700 * @see java.lang.Float#TYPE
701 * @see java.lang.Double#TYPE
702 * @see java.lang.Void#TYPE
703 * @since 1.1
704 */
705 @HotSpotIntrinsicCandidate
706 public native boolean isPrimitive();
707
708 /**
709 * Returns true if this {@code Class} object represents an annotation
710 * type. Note that if this method returns true, {@link #isInterface()}
711 * would also return true, as all annotation types are also interfaces.
712 *
713 * @return {@code true} if this class object represents an annotation
714 * type; {@code false} otherwise
715 * @since 1.5
716 */
717 public boolean isAnnotation() {
718 return (getModifiers() & ANNOTATION) != 0;
719 }
720
721 /**
722 * Returns {@code true} if this class is a synthetic class;
723 * returns {@code false} otherwise.
724 * @return {@code true} if and only if this class is a synthetic class as
725 * defined by the Java Language Specification.
726 * @jls 13.1 The Form of a Binary
727 * @since 1.5
728 */
729 public boolean isSynthetic() {
730 return (getModifiers() & SYNTHETIC) != 0;
731 }
732
733 /**
734 * Returns the name of the entity (class, interface, array class,
735 * primitive type, or void) represented by this {@code Class} object,
736 * as a {@code String}.
737 *
738 * <p> If this class object represents a reference type that is not an
739 * array type then the binary name of the class is returned, as specified
740 * by
741 * <cite>The Java™ Language Specification</cite>.
742 *
743 * <p> If this class object represents a primitive type or void, then the
744 * name returned is a {@code String} equal to the Java language
745 * keyword corresponding to the primitive type or void.
746 *
747 * <p> If this class object represents a class of arrays, then the internal
748 * form of the name consists of the name of the element type preceded by
749 * one or more '{@code [}' characters representing the depth of the array
750 * nesting. The encoding of element type names is as follows:
751 *
752 * <blockquote><table class="striped">
753 * <caption style="display:none">Element types and encodings</caption>
754 * <thead>
755 * <tr><th scope="col"> Element Type <th scope="col"> Encoding
756 * </thead>
757 * <tbody style="text-align:left">
758 * <tr><th scope="row"> boolean <td style="text-align:center"> Z
759 * <tr><th scope="row"> byte <td style="text-align:center"> B
760 * <tr><th scope="row"> char <td style="text-align:center"> C
761 * <tr><th scope="row"> class or interface
762 * <td style="text-align:center"> L<i>classname</i>;
763 * <tr><th scope="row"> double <td style="text-align:center"> D
764 * <tr><th scope="row"> float <td style="text-align:center"> F
765 * <tr><th scope="row"> int <td style="text-align:center"> I
766 * <tr><th scope="row"> long <td style="text-align:center"> J
767 * <tr><th scope="row"> short <td style="text-align:center"> S
768 * </tbody>
769 * </table></blockquote>
770 *
771 * <p> The class or interface name <i>classname</i> is the binary name of
772 * the class specified above.
773 *
774 * <p> Examples:
775 * <blockquote><pre>
776 * String.class.getName()
777 * returns "java.lang.String"
778 * byte.class.getName()
779 * returns "byte"
780 * (new Object[3]).getClass().getName()
781 * returns "[Ljava.lang.Object;"
782 * (new int[3][4][5][6][7][8][9]).getClass().getName()
783 * returns "[[[[[[[I"
784 * </pre></blockquote>
785 *
786 * @return the name of the class or interface
787 * represented by this object.
788 */
789 public String getName() {
790 String name = this.name;
791 if (name == null)
792 this.name = name = getName0();
793 return name;
794 }
795
796 // cache the name to reduce the number of calls into the VM
797 private transient String name;
798 private native String getName0();
799
800 /**
801 * Returns the class loader for the class. Some implementations may use
802 * null to represent the bootstrap class loader. This method will return
803 * null in such implementations if this class was loaded by the bootstrap
804 * class loader.
805 *
806 * <p>If this object
807 * represents a primitive type or void, null is returned.
808 *
809 * @return the class loader that loaded the class or interface
810 * represented by this object.
811 * @throws SecurityException
812 * if a security manager is present, and the caller's class loader
813 * is not {@code null} and is not the same as or an ancestor of the
814 * class loader for the class whose class loader is requested,
815 * and the caller does not have the
816 * {@link RuntimePermission}{@code ("getClassLoader")}
817 * @see java.lang.ClassLoader
818 * @see SecurityManager#checkPermission
819 * @see java.lang.RuntimePermission
820 */
821 @CallerSensitive
822 @ForceInline // to ensure Reflection.getCallerClass optimization
823 public ClassLoader getClassLoader() {
824 ClassLoader cl = getClassLoader0();
825 if (cl == null)
826 return null;
827 SecurityManager sm = System.getSecurityManager();
828 if (sm != null) {
829 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
830 }
831 return cl;
832 }
833
834 // Package-private to allow ClassLoader access
835 ClassLoader getClassLoader0() { return classLoader; }
836
837 /**
838 * Returns the module that this class or interface is a member of.
839 *
840 * If this class represents an array type then this method returns the
841 * {@code Module} for the element type. If this class represents a
842 * primitive type or void, then the {@code Module} object for the
843 * {@code java.base} module is returned.
844 *
845 * If this class is in an unnamed module then the {@linkplain
846 * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class
847 * loader for this class is returned.
848 *
849 * @return the module that this class or interface is a member of
850 *
851 * @since 9
852 * @spec JPMS
853 */
854 public Module getModule() {
855 return module;
856 }
857
858 // set by VM
859 private transient Module module;
860
861 // Initialized in JVM not by private constructor
862 // This field is filtered from reflection access, i.e. getDeclaredField
863 // will throw NoSuchFieldException
864 private final ClassLoader classLoader;
865
866 /**
867 * Returns an array of {@code TypeVariable} objects that represent the
868 * type variables declared by the generic declaration represented by this
869 * {@code GenericDeclaration} object, in declaration order. Returns an
870 * array of length 0 if the underlying generic declaration declares no type
871 * variables.
872 *
873 * @return an array of {@code TypeVariable} objects that represent
874 * the type variables declared by this generic declaration
875 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
876 * signature of this generic declaration does not conform to
877 * the format specified in
878 * <cite>The Java™ Virtual Machine Specification</cite>
879 * @since 1.5
880 */
881 @SuppressWarnings("unchecked")
882 public TypeVariable<Class<T>>[] getTypeParameters() {
883 ClassRepository info = getGenericInfo();
884 if (info != null)
885 return (TypeVariable<Class<T>>[])info.getTypeParameters();
886 else
887 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
888 }
889
890
891 /**
892 * Returns the {@code Class} representing the direct superclass of the
893 * entity (class, interface, primitive type or void) represented by
894 * this {@code Class}. If this {@code Class} represents either the
895 * {@code Object} class, an interface, a primitive type, or void, then
896 * null is returned. If this object represents an array class then the
897 * {@code Class} object representing the {@code Object} class is
898 * returned.
899 *
900 * @return the direct superclass of the class represented by this object
901 */
902 @HotSpotIntrinsicCandidate
903 public native Class<? super T> getSuperclass();
904
905
906 /**
907 * Returns the {@code Type} representing the direct superclass of
908 * the entity (class, interface, primitive type or void) represented by
909 * this {@code Class}.
910 *
911 * <p>If the superclass is a parameterized type, the {@code Type}
912 * object returned must accurately reflect the actual type
913 * parameters used in the source code. The parameterized type
914 * representing the superclass is created if it had not been
915 * created before. See the declaration of {@link
916 * java.lang.reflect.ParameterizedType ParameterizedType} for the
917 * semantics of the creation process for parameterized types. If
918 * this {@code Class} represents either the {@code Object}
919 * class, an interface, a primitive type, or void, then null is
920 * returned. If this object represents an array class then the
921 * {@code Class} object representing the {@code Object} class is
922 * returned.
923 *
924 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
925 * class signature does not conform to the format specified in
926 * <cite>The Java™ Virtual Machine Specification</cite>
927 * @throws TypeNotPresentException if the generic superclass
928 * refers to a non-existent type declaration
929 * @throws java.lang.reflect.MalformedParameterizedTypeException if the
930 * generic superclass refers to a parameterized type that cannot be
931 * instantiated for any reason
932 * @return the direct superclass of the class represented by this object
933 * @since 1.5
934 */
935 public Type getGenericSuperclass() {
936 ClassRepository info = getGenericInfo();
937 if (info == null) {
938 return getSuperclass();
939 }
940
941 // Historical irregularity:
942 // Generic signature marks interfaces with superclass = Object
943 // but this API returns null for interfaces
944 if (isInterface()) {
945 return null;
946 }
947
948 return info.getSuperclass();
949 }
950
951 /**
952 * Gets the package of this class.
953 *
954 * <p>If this class represents an array type, a primitive type or void,
955 * this method returns {@code null}.
956 *
957 * @return the package of this class.
958 * @revised 9
959 * @spec JPMS
960 */
961 public Package getPackage() {
962 if (isPrimitive() || isArray()) {
963 return null;
964 }
965 ClassLoader cl = getClassLoader0();
966 return cl != null ? cl.definePackage(this)
967 : BootLoader.definePackage(this);
968 }
969
970 /**
971 * Returns the fully qualified package name.
972 *
973 * <p> If this class is a top level class, then this method returns the fully
974 * qualified name of the package that the class is a member of, or the
975 * empty string if the class is in an unnamed package.
976 *
977 * <p> If this class is a member class, then this method is equivalent to
978 * invoking {@code getPackageName()} on the {@linkplain #getEnclosingClass
979 * enclosing class}.
980 *
981 * <p> If this class is a {@linkplain #isLocalClass local class} or an {@linkplain
982 * #isAnonymousClass() anonymous class}, then this method is equivalent to
983 * invoking {@code getPackageName()} on the {@linkplain #getDeclaringClass
984 * declaring class} of the {@linkplain #getEnclosingMethod enclosing method} or
985 * {@linkplain #getEnclosingConstructor enclosing constructor}.
986 *
987 * <p> If this class represents an array type then this method returns the
988 * package name of the element type. If this class represents a primitive
989 * type or void then the package name "{@code java.lang}" is returned.
990 *
991 * @return the fully qualified package name
992 *
993 * @since 9
994 * @spec JPMS
995 * @jls 6.7 Fully Qualified Names
996 */
997 public String getPackageName() {
998 String pn = this.packageName;
999 if (pn == null) {
1000 Class<?> c = this;
1001 while (c.isArray()) {
1002 c = c.getComponentType();
1003 }
1004 if (c.isPrimitive()) {
1005 pn = "java.lang";
1006 } else {
1007 String cn = c.getName();
1008 int dot = cn.lastIndexOf('.');
1009 pn = (dot != -1) ? cn.substring(0, dot).intern() : "";
1010 }
1011 this.packageName = pn;
1012 }
1013 return pn;
1014 }
1015
1016 // cached package name
1017 private transient String packageName;
1018
1019 /**
1020 * Returns the interfaces directly implemented by the class or interface
1021 * represented by this object.
1022 *
1023 * <p>If this object represents a class, the return value is an array
1024 * containing objects representing all interfaces directly implemented by
1025 * the class. The order of the interface objects in the array corresponds
1026 * to the order of the interface names in the {@code implements} clause of
1027 * the declaration of the class represented by this object. For example,
1028 * given the declaration:
1029 * <blockquote>
1030 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
1031 * </blockquote>
1032 * suppose the value of {@code s} is an instance of
1033 * {@code Shimmer}; the value of the expression:
1034 * <blockquote>
1035 * {@code s.getClass().getInterfaces()[0]}
1036 * </blockquote>
1037 * is the {@code Class} object that represents interface
1038 * {@code FloorWax}; and the value of:
1039 * <blockquote>
1040 * {@code s.getClass().getInterfaces()[1]}
1041 * </blockquote>
1042 * is the {@code Class} object that represents interface
1043 * {@code DessertTopping}.
1044 *
1045 * <p>If this object represents an interface, the array contains objects
1046 * representing all interfaces directly extended by the interface. The
1047 * order of the interface objects in the array corresponds to the order of
1048 * the interface names in the {@code extends} clause of the declaration of
1049 * the interface represented by this object.
1050 *
1051 * <p>If this object represents a class or interface that implements no
1052 * interfaces, the method returns an array of length 0.
1053 *
1054 * <p>If this object represents a primitive type or void, the method
1055 * returns an array of length 0.
1056 *
1057 * <p>If this {@code Class} object represents an array type, the
1058 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1059 * returned in that order.
1060 *
1061 * @return an array of interfaces directly implemented by this class
1062 */
1063 public Class<?>[] getInterfaces() {
1064 // defensively copy before handing over to user code
1065 return getInterfaces(true);
1066 }
1067
1068 private Class<?>[] getInterfaces(boolean cloneArray) {
1069 ReflectionData<T> rd = reflectionData();
1070 if (rd == null) {
1071 // no cloning required
1072 return getInterfaces0();
1073 } else {
1074 Class<?>[] interfaces = rd.interfaces;
1075 if (interfaces == null) {
1076 interfaces = getInterfaces0();
1077 rd.interfaces = interfaces;
1078 }
1079 // defensively copy if requested
1080 return cloneArray ? interfaces.clone() : interfaces;
1081 }
1082 }
1083
1084 private native Class<?>[] getInterfaces0();
1085
1086 /**
1087 * Returns the {@code Type}s representing the interfaces
1088 * directly implemented by the class or interface represented by
1089 * this object.
1090 *
1091 * <p>If a superinterface is a parameterized type, the
1092 * {@code Type} object returned for it must accurately reflect
1093 * the actual type parameters used in the source code. The
1094 * parameterized type representing each superinterface is created
1095 * if it had not been created before. See the declaration of
1096 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
1097 * for the semantics of the creation process for parameterized
1098 * types.
1099 *
1100 * <p>If this object represents a class, the return value is an array
1101 * containing objects representing all interfaces directly implemented by
1102 * the class. The order of the interface objects in the array corresponds
1103 * to the order of the interface names in the {@code implements} clause of
1104 * the declaration of the class represented by this object.
1105 *
1106 * <p>If this object represents an interface, the array contains objects
1107 * representing all interfaces directly extended by the interface. The
1108 * order of the interface objects in the array corresponds to the order of
1109 * the interface names in the {@code extends} clause of the declaration of
1110 * the interface represented by this object.
1111 *
1112 * <p>If this object represents a class or interface that implements no
1113 * interfaces, the method returns an array of length 0.
1114 *
1115 * <p>If this object represents a primitive type or void, the method
1116 * returns an array of length 0.
1117 *
1118 * <p>If this {@code Class} object represents an array type, the
1119 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1120 * returned in that order.
1121 *
1122 * @throws java.lang.reflect.GenericSignatureFormatError
1123 * if the generic class signature does not conform to the format
1124 * specified in
1125 * <cite>The Java™ Virtual Machine Specification</cite>
1126 * @throws TypeNotPresentException if any of the generic
1127 * superinterfaces refers to a non-existent type declaration
1128 * @throws java.lang.reflect.MalformedParameterizedTypeException
1129 * if any of the generic superinterfaces refer to a parameterized
1130 * type that cannot be instantiated for any reason
1131 * @return an array of interfaces directly implemented by this class
1132 * @since 1.5
1133 */
1134 public Type[] getGenericInterfaces() {
1135 ClassRepository info = getGenericInfo();
1136 return (info == null) ? getInterfaces() : info.getSuperInterfaces();
1137 }
1138
1139
1140 /**
1141 * Returns the {@code Class} representing the component type of an
1142 * array. If this class does not represent an array class this method
1143 * returns null.
1144 *
1145 * @return the {@code Class} representing the component type of this
1146 * class if this class is an array
1147 * @see java.lang.reflect.Array
1148 * @since 1.1
1149 */
1150 public Class<?> getComponentType() {
1151 // Only return for array types. Storage may be reused for Class for instance types.
1152 if (isArray()) {
1153 return componentType;
1154 } else {
1155 return null;
1156 }
1157 }
1158
1159 private final Class<?> componentType;
1160
1161
1162 /**
1163 * Returns the Java language modifiers for this class or interface, encoded
1164 * in an integer. The modifiers consist of the Java Virtual Machine's
1165 * constants for {@code public}, {@code protected},
1166 * {@code private}, {@code final}, {@code static},
1167 * {@code abstract} and {@code interface}; they should be decoded
1168 * using the methods of class {@code Modifier}.
1169 *
1170 * <p> If the underlying class is an array class, then its
1171 * {@code public}, {@code private} and {@code protected}
1172 * modifiers are the same as those of its component type. If this
1173 * {@code Class} represents a primitive type or void, its
1174 * {@code public} modifier is always {@code true}, and its
1175 * {@code protected} and {@code private} modifiers are always
1176 * {@code false}. If this object represents an array class, a
1177 * primitive type or void, then its {@code final} modifier is always
1178 * {@code true} and its interface modifier is always
1179 * {@code false}. The values of its other modifiers are not determined
1180 * by this specification.
1181 *
1182 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
1183 * Specification</em>, table 4.1.
1184 *
1185 * @return the {@code int} representing the modifiers for this class
1186 * @see java.lang.reflect.Modifier
1187 * @since 1.1
1188 */
1189 @HotSpotIntrinsicCandidate
1190 public native int getModifiers();
1191
1192
1193 /**
1194 * Gets the signers of this class.
1195 *
1196 * @return the signers of this class, or null if there are no signers. In
1197 * particular, this method returns null if this object represents
1198 * a primitive type or void.
1199 * @since 1.1
1200 */
1201 public native Object[] getSigners();
1202
1203
1204 /**
1205 * Set the signers of this class.
1206 */
1207 native void setSigners(Object[] signers);
1208
1209
1210 /**
1211 * If this {@code Class} object represents a local or anonymous
1212 * class within a method, returns a {@link
1213 * java.lang.reflect.Method Method} object representing the
1214 * immediately enclosing method of the underlying class. Returns
1215 * {@code null} otherwise.
1216 *
1217 * In particular, this method returns {@code null} if the underlying
1218 * class is a local or anonymous class immediately enclosed by a type
1219 * declaration, instance initializer or static initializer.
1220 *
1221 * @return the immediately enclosing method of the underlying class, if
1222 * that class is a local or anonymous class; otherwise {@code null}.
1223 *
1224 * @throws SecurityException
1225 * If a security manager, <i>s</i>, is present and any of the
1226 * following conditions is met:
1227 *
1228 * <ul>
1229 *
1230 * <li> the caller's class loader is not the same as the
1231 * class loader of the enclosing class and invocation of
1232 * {@link SecurityManager#checkPermission
1233 * s.checkPermission} method with
1234 * {@code RuntimePermission("accessDeclaredMembers")}
1235 * denies access to the methods within the enclosing class
1236 *
1237 * <li> the caller's class loader is not the same as or an
1238 * ancestor of the class loader for the enclosing class and
1239 * invocation of {@link SecurityManager#checkPackageAccess
1240 * s.checkPackageAccess()} denies access to the package
1241 * of the enclosing class
1242 *
1243 * </ul>
1244 * @since 1.5
1245 */
1246 @CallerSensitive
1247 public Method getEnclosingMethod() throws SecurityException {
1248 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1249
1250 if (enclosingInfo == null)
1251 return null;
1252 else {
1253 if (!enclosingInfo.isMethod())
1254 return null;
1255
1256 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
1257 getFactory());
1258 Class<?> returnType = toClass(typeInfo.getReturnType());
1259 Type [] parameterTypes = typeInfo.getParameterTypes();
1260 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1261
1262 // Convert Types to Classes; returned types *should*
1263 // be class objects since the methodDescriptor's used
1264 // don't have generics information
1265 for(int i = 0; i < parameterClasses.length; i++)
1266 parameterClasses[i] = toClass(parameterTypes[i]);
1267
1268 // Perform access check
1269 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1270 SecurityManager sm = System.getSecurityManager();
1271 if (sm != null) {
1272 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
1273 Reflection.getCallerClass(), true);
1274 }
1275 Method[] candidates = enclosingCandidate.privateGetDeclaredMethods(false);
1276
1277 /*
1278 * Loop over all declared methods; match method name,
1279 * number of and type of parameters, *and* return
1280 * type. Matching return type is also necessary
1281 * because of covariant returns, etc.
1282 */
1283 ReflectionFactory fact = getReflectionFactory();
1284 for (Method m : candidates) {
1285 if (m.getName().equals(enclosingInfo.getName()) &&
1286 arrayContentsEq(parameterClasses,
1287 fact.getExecutableSharedParameterTypes(m))) {
1288 // finally, check return type
1289 if (m.getReturnType().equals(returnType)) {
1290 return fact.copyMethod(m);
1291 }
1292 }
1293 }
1294
1295 throw new InternalError("Enclosing method not found");
1296 }
1297 }
1298
1299 private native Object[] getEnclosingMethod0();
1300
1301 private EnclosingMethodInfo getEnclosingMethodInfo() {
1302 Object[] enclosingInfo = getEnclosingMethod0();
1303 if (enclosingInfo == null)
1304 return null;
1305 else {
1306 return new EnclosingMethodInfo(enclosingInfo);
1307 }
1308 }
1309
1310 private static final class EnclosingMethodInfo {
1311 private final Class<?> enclosingClass;
1312 private final String name;
1313 private final String descriptor;
1314
1315 static void validate(Object[] enclosingInfo) {
1316 if (enclosingInfo.length != 3)
1317 throw new InternalError("Malformed enclosing method information");
1318 try {
1319 // The array is expected to have three elements:
1320
1321 // the immediately enclosing class
1322 Class<?> enclosingClass = (Class<?>)enclosingInfo[0];
1323 assert(enclosingClass != null);
1324
1325 // the immediately enclosing method or constructor's
1326 // name (can be null).
1327 String name = (String)enclosingInfo[1];
1328
1329 // the immediately enclosing method or constructor's
1330 // descriptor (null iff name is).
1331 String descriptor = (String)enclosingInfo[2];
1332 assert((name != null && descriptor != null) || name == descriptor);
1333 } catch (ClassCastException cce) {
1334 throw new InternalError("Invalid type in enclosing method information", cce);
1335 }
1336 }
1337
1338 EnclosingMethodInfo(Object[] enclosingInfo) {
1339 validate(enclosingInfo);
1340 this.enclosingClass = (Class<?>)enclosingInfo[0];
1341 this.name = (String)enclosingInfo[1];
1342 this.descriptor = (String)enclosingInfo[2];
1343 }
1344
1345 boolean isPartial() {
1346 return enclosingClass == null || name == null || descriptor == null;
1347 }
1348
1349 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
1350
1351 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
1352
1353 Class<?> getEnclosingClass() { return enclosingClass; }
1354
1355 String getName() { return name; }
1356
1357 String getDescriptor() { return descriptor; }
1358
1359 }
1360
1361 private static Class<?> toClass(Type o) {
1362 if (o instanceof GenericArrayType)
1363 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1364 0)
1365 .getClass();
1366 return (Class<?>)o;
1367 }
1368
1369 /**
1370 * If this {@code Class} object represents a local or anonymous
1371 * class within a constructor, returns a {@link
1372 * java.lang.reflect.Constructor Constructor} object representing
1373 * the immediately enclosing constructor of the underlying
1374 * class. Returns {@code null} otherwise. In particular, this
1375 * method returns {@code null} if the underlying class is a local
1376 * or anonymous class immediately enclosed by a type declaration,
1377 * instance initializer or static initializer.
1378 *
1379 * @return the immediately enclosing constructor of the underlying class, if
1380 * that class is a local or anonymous class; otherwise {@code null}.
1381 * @throws SecurityException
1382 * If a security manager, <i>s</i>, is present and any of the
1383 * following conditions is met:
1384 *
1385 * <ul>
1386 *
1387 * <li> the caller's class loader is not the same as the
1388 * class loader of the enclosing class and invocation of
1389 * {@link SecurityManager#checkPermission
1390 * s.checkPermission} method with
1391 * {@code RuntimePermission("accessDeclaredMembers")}
1392 * denies access to the constructors within the enclosing class
1393 *
1394 * <li> the caller's class loader is not the same as or an
1395 * ancestor of the class loader for the enclosing class and
1396 * invocation of {@link SecurityManager#checkPackageAccess
1397 * s.checkPackageAccess()} denies access to the package
1398 * of the enclosing class
1399 *
1400 * </ul>
1401 * @since 1.5
1402 */
1403 @CallerSensitive
1404 public Constructor<?> getEnclosingConstructor() throws SecurityException {
1405 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1406
1407 if (enclosingInfo == null)
1408 return null;
1409 else {
1410 if (!enclosingInfo.isConstructor())
1411 return null;
1412
1413 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1414 getFactory());
1415 Type [] parameterTypes = typeInfo.getParameterTypes();
1416 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1417
1418 // Convert Types to Classes; returned types *should*
1419 // be class objects since the methodDescriptor's used
1420 // don't have generics information
1421 for(int i = 0; i < parameterClasses.length; i++)
1422 parameterClasses[i] = toClass(parameterTypes[i]);
1423
1424 // Perform access check
1425 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1426 SecurityManager sm = System.getSecurityManager();
1427 if (sm != null) {
1428 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
1429 Reflection.getCallerClass(), true);
1430 }
1431
1432 Constructor<?>[] candidates = enclosingCandidate
1433 .privateGetDeclaredConstructors(false);
1434 /*
1435 * Loop over all declared constructors; match number
1436 * of and type of parameters.
1437 */
1438 ReflectionFactory fact = getReflectionFactory();
1439 for (Constructor<?> c : candidates) {
1440 if (arrayContentsEq(parameterClasses,
1441 fact.getExecutableSharedParameterTypes(c))) {
1442 return fact.copyConstructor(c);
1443 }
1444 }
1445
1446 throw new InternalError("Enclosing constructor not found");
1447 }
1448 }
1449
1450
1451 /**
1452 * If the class or interface represented by this {@code Class} object
1453 * is a member of another class, returns the {@code Class} object
1454 * representing the class in which it was declared. This method returns
1455 * null if this class or interface is not a member of any other class. If
1456 * this {@code Class} object represents an array class, a primitive
1457 * type, or void,then this method returns null.
1458 *
1459 * @return the declaring class for this class
1460 * @throws SecurityException
1461 * If a security manager, <i>s</i>, is present and the caller's
1462 * class loader is not the same as or an ancestor of the class
1463 * loader for the declaring class and invocation of {@link
1464 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1465 * denies access to the package of the declaring class
1466 * @since 1.1
1467 */
1468 @CallerSensitive
1469 public Class<?> getDeclaringClass() throws SecurityException {
1470 final Class<?> candidate = getDeclaringClass0();
1471
1472 if (candidate != null) {
1473 SecurityManager sm = System.getSecurityManager();
1474 if (sm != null) {
1475 candidate.checkPackageAccess(sm,
1476 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1477 }
1478 }
1479 return candidate;
1480 }
1481
1482 private native Class<?> getDeclaringClass0();
1483
1484
1485 /**
1486 * Returns the immediately enclosing class of the underlying
1487 * class. If the underlying class is a top level class this
1488 * method returns {@code null}.
1489 * @return the immediately enclosing class of the underlying class
1490 * @exception SecurityException
1491 * If a security manager, <i>s</i>, is present and the caller's
1492 * class loader is not the same as or an ancestor of the class
1493 * loader for the enclosing class and invocation of {@link
1494 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1495 * denies access to the package of the enclosing class
1496 * @since 1.5
1497 */
1498 @CallerSensitive
1499 public Class<?> getEnclosingClass() throws SecurityException {
1500 // There are five kinds of classes (or interfaces):
1501 // a) Top level classes
1502 // b) Nested classes (static member classes)
1503 // c) Inner classes (non-static member classes)
1504 // d) Local classes (named classes declared within a method)
1505 // e) Anonymous classes
1506
1507
1508 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1509 // attribute if and only if it is a local class or an
1510 // anonymous class.
1511 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1512 Class<?> enclosingCandidate;
1513
1514 if (enclosingInfo == null) {
1515 // This is a top level or a nested class or an inner class (a, b, or c)
1516 enclosingCandidate = getDeclaringClass0();
1517 } else {
1518 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1519 // This is a local class or an anonymous class (d or e)
1520 if (enclosingClass == this || enclosingClass == null)
1521 throw new InternalError("Malformed enclosing method information");
1522 else
1523 enclosingCandidate = enclosingClass;
1524 }
1525
1526 if (enclosingCandidate != null) {
1527 SecurityManager sm = System.getSecurityManager();
1528 if (sm != null) {
1529 enclosingCandidate.checkPackageAccess(sm,
1530 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1531 }
1532 }
1533 return enclosingCandidate;
1534 }
1535
1536 /**
1537 * Returns the simple name of the underlying class as given in the
1538 * source code. Returns an empty string if the underlying class is
1539 * anonymous.
1540 *
1541 * <p>The simple name of an array is the simple name of the
1542 * component type with "[]" appended. In particular the simple
1543 * name of an array whose component type is anonymous is "[]".
1544 *
1545 * @return the simple name of the underlying class
1546 * @since 1.5
1547 */
1548 public String getSimpleName() {
1549 ReflectionData<T> rd = reflectionData();
1550 String simpleName = rd.simpleName;
1551 if (simpleName == null) {
1552 rd.simpleName = simpleName = getSimpleName0();
1553 }
1554 return simpleName;
1555 }
1556
1557 private String getSimpleName0() {
1558 if (isArray()) {
1559 return getComponentType().getSimpleName() + "[]";
1560 }
1561 String simpleName = getSimpleBinaryName();
1562 if (simpleName == null) { // top level class
1563 simpleName = getName();
1564 simpleName = simpleName.substring(simpleName.lastIndexOf('.') + 1); // strip the package name
1565 }
1566 return simpleName;
1567 }
1568
1569 /**
1570 * Return an informative string for the name of this type.
1571 *
1572 * @return an informative string for the name of this type
1573 * @since 1.8
1574 */
1575 public String getTypeName() {
1576 if (isArray()) {
1577 try {
1578 Class<?> cl = this;
1579 int dimensions = 0;
1580 do {
1581 dimensions++;
1582 cl = cl.getComponentType();
1583 } while (cl.isArray());
1584 StringBuilder sb = new StringBuilder();
1585 sb.append(cl.getName());
1586 for (int i = 0; i < dimensions; i++) {
1587 sb.append("[]");
1588 }
1589 return sb.toString();
1590 } catch (Throwable e) { /*FALLTHRU*/ }
1591 }
1592 return getName();
1593 }
1594
1595 /**
1596 * Returns the canonical name of the underlying class as
1597 * defined by the Java Language Specification. Returns null if
1598 * the underlying class does not have a canonical name (i.e., if
1599 * it is a local or anonymous class or an array whose component
1600 * type does not have a canonical name).
1601 * @return the canonical name of the underlying class if it exists, and
1602 * {@code null} otherwise.
1603 * @since 1.5
1604 */
1605 public String getCanonicalName() {
1606 ReflectionData<T> rd = reflectionData();
1607 String canonicalName = rd.canonicalName;
1608 if (canonicalName == null) {
1609 rd.canonicalName = canonicalName = getCanonicalName0();
1610 }
1611 return canonicalName == ReflectionData.NULL_SENTINEL? null : canonicalName;
1612 }
1613
1614 private String getCanonicalName0() {
1615 if (isArray()) {
1616 String canonicalName = getComponentType().getCanonicalName();
1617 if (canonicalName != null)
1618 return canonicalName + "[]";
1619 else
1620 return ReflectionData.NULL_SENTINEL;
1621 }
1622 if (isLocalOrAnonymousClass())
1623 return ReflectionData.NULL_SENTINEL;
1624 Class<?> enclosingClass = getEnclosingClass();
1625 if (enclosingClass == null) { // top level class
1626 return getName();
1627 } else {
1628 String enclosingName = enclosingClass.getCanonicalName();
1629 if (enclosingName == null)
1630 return ReflectionData.NULL_SENTINEL;
1631 return enclosingName + "." + getSimpleName();
1632 }
1633 }
1634
1635 /**
1636 * Returns {@code true} if and only if the underlying class
1637 * is an anonymous class.
1638 *
1639 * @return {@code true} if and only if this class is an anonymous class.
1640 * @since 1.5
1641 */
1642 public boolean isAnonymousClass() {
1643 return !isArray() && isLocalOrAnonymousClass() &&
1644 getSimpleBinaryName0() == null;
1645 }
1646
1647 /**
1648 * Returns {@code true} if and only if the underlying class
1649 * is a local class.
1650 *
1651 * @return {@code true} if and only if this class is a local class.
1652 * @since 1.5
1653 */
1654 public boolean isLocalClass() {
1655 return isLocalOrAnonymousClass() &&
1656 (isArray() || getSimpleBinaryName0() != null);
1657 }
1658
1659 /**
1660 * Returns {@code true} if and only if the underlying class
1661 * is a member class.
1662 *
1663 * @return {@code true} if and only if this class is a member class.
1664 * @since 1.5
1665 */
1666 public boolean isMemberClass() {
1667 return !isLocalOrAnonymousClass() && getDeclaringClass0() != null;
1668 }
1669
1670 /**
1671 * Returns the "simple binary name" of the underlying class, i.e.,
1672 * the binary name without the leading enclosing class name.
1673 * Returns {@code null} if the underlying class is a top level
1674 * class.
1675 */
1676 private String getSimpleBinaryName() {
1677 if (isTopLevelClass())
1678 return null;
1679 String name = getSimpleBinaryName0();
1680 if (name == null) // anonymous class
1681 return "";
1682 return name;
1683 }
1684
1685 private native String getSimpleBinaryName0();
1686
1687 /**
1688 * Returns {@code true} if this is a top level class. Returns {@code false}
1689 * otherwise.
1690 */
1691 private boolean isTopLevelClass() {
1692 return !isLocalOrAnonymousClass() && getDeclaringClass0() == null;
1693 }
1694
1695 /**
1696 * Returns {@code true} if this is a local class or an anonymous
1697 * class. Returns {@code false} otherwise.
1698 */
1699 private boolean isLocalOrAnonymousClass() {
1700 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1701 // attribute if and only if it is a local class or an
1702 // anonymous class.
1703 return hasEnclosingMethodInfo();
1704 }
1705
1706 private boolean hasEnclosingMethodInfo() {
1707 Object[] enclosingInfo = getEnclosingMethod0();
1708 if (enclosingInfo != null) {
1709 EnclosingMethodInfo.validate(enclosingInfo);
1710 return true;
1711 }
1712 return false;
1713 }
1714
1715 /**
1716 * Returns an array containing {@code Class} objects representing all
1717 * the public classes and interfaces that are members of the class
1718 * represented by this {@code Class} object. This includes public
1719 * class and interface members inherited from superclasses and public class
1720 * and interface members declared by the class. This method returns an
1721 * array of length 0 if this {@code Class} object has no public member
1722 * classes or interfaces. This method also returns an array of length 0 if
1723 * this {@code Class} object represents a primitive type, an array
1724 * class, or void.
1725 *
1726 * @return the array of {@code Class} objects representing the public
1727 * members of this class
1728 * @throws SecurityException
1729 * If a security manager, <i>s</i>, is present and
1730 * the caller's class loader is not the same as or an
1731 * ancestor of the class loader for the current class and
1732 * invocation of {@link SecurityManager#checkPackageAccess
1733 * s.checkPackageAccess()} denies access to the package
1734 * of this class.
1735 *
1736 * @since 1.1
1737 */
1738 @CallerSensitive
1739 public Class<?>[] getClasses() {
1740 SecurityManager sm = System.getSecurityManager();
1741 if (sm != null) {
1742 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
1743 }
1744
1745 // Privileged so this implementation can look at DECLARED classes,
1746 // something the caller might not have privilege to do. The code here
1747 // is allowed to look at DECLARED classes because (1) it does not hand
1748 // out anything other than public members and (2) public member access
1749 // has already been ok'd by the SecurityManager.
1750
1751 return java.security.AccessController.doPrivileged(
1752 new java.security.PrivilegedAction<>() {
1753 public Class<?>[] run() {
1754 List<Class<?>> list = new ArrayList<>();
1755 Class<?> currentClass = Class.this;
1756 while (currentClass != null) {
1757 for (Class<?> m : currentClass.getDeclaredClasses()) {
1758 if (Modifier.isPublic(m.getModifiers())) {
1759 list.add(m);
1760 }
1761 }
1762 currentClass = currentClass.getSuperclass();
1763 }
1764 return list.toArray(new Class<?>[0]);
1765 }
1766 });
1767 }
1768
1769
1770 /**
1771 * Returns an array containing {@code Field} objects reflecting all
1772 * the accessible public fields of the class or interface represented by
1773 * this {@code Class} object.
1774 *
1775 * <p> If this {@code Class} object represents a class or interface with
1776 * no accessible public fields, then this method returns an array of length
1777 * 0.
1778 *
1779 * <p> If this {@code Class} object represents a class, then this method
1780 * returns the public fields of the class and of all its superclasses and
1781 * superinterfaces.
1782 *
1783 * <p> If this {@code Class} object represents an interface, then this
1784 * method returns the fields of the interface and of all its
1785 * superinterfaces.
1786 *
1787 * <p> If this {@code Class} object represents an array type, a primitive
1788 * type, or void, then this method returns an array of length 0.
1789 *
1790 * <p> The elements in the returned array are not sorted and are not in any
1791 * particular order.
1792 *
1793 * @return the array of {@code Field} objects representing the
1794 * public fields
1795 * @throws SecurityException
1796 * If a security manager, <i>s</i>, is present and
1797 * the caller's class loader is not the same as or an
1798 * ancestor of the class loader for the current class and
1799 * invocation of {@link SecurityManager#checkPackageAccess
1800 * s.checkPackageAccess()} denies access to the package
1801 * of this class.
1802 *
1803 * @since 1.1
1804 * @jls 8.2 Class Members
1805 * @jls 8.3 Field Declarations
1806 */
1807 @CallerSensitive
1808 public Field[] getFields() throws SecurityException {
1809 SecurityManager sm = System.getSecurityManager();
1810 if (sm != null) {
1811 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1812 }
1813 return copyFields(privateGetPublicFields());
1814 }
1815
1816
1817 /**
1818 * Returns an array containing {@code Method} objects reflecting all the
1819 * public methods of the class or interface represented by this {@code
1820 * Class} object, including those declared by the class or interface and
1821 * those inherited from superclasses and superinterfaces.
1822 *
1823 * <p> If this {@code Class} object represents an array type, then the
1824 * returned array has a {@code Method} object for each of the public
1825 * methods inherited by the array type from {@code Object}. It does not
1826 * contain a {@code Method} object for {@code clone()}.
1827 *
1828 * <p> If this {@code Class} object represents an interface then the
1829 * returned array does not contain any implicitly declared methods from
1830 * {@code Object}. Therefore, if no methods are explicitly declared in
1831 * this interface or any of its superinterfaces then the returned array
1832 * has length 0. (Note that a {@code Class} object which represents a class
1833 * always has public methods, inherited from {@code Object}.)
1834 *
1835 * <p> The returned array never contains methods with names "{@code <init>}"
1836 * or "{@code <clinit>}".
1837 *
1838 * <p> The elements in the returned array are not sorted and are not in any
1839 * particular order.
1840 *
1841 * <p> Generally, the result is computed as with the following 4 step algorithm.
1842 * Let C be the class or interface represented by this {@code Class} object:
1843 * <ol>
1844 * <li> A union of methods is composed of:
1845 * <ol type="a">
1846 * <li> C's declared public instance and static methods as returned by
1847 * {@link #getDeclaredMethods()} and filtered to include only public
1848 * methods.</li>
1849 * <li> If C is a class other than {@code Object}, then include the result
1850 * of invoking this algorithm recursively on the superclass of C.</li>
1851 * <li> Include the results of invoking this algorithm recursively on all
1852 * direct superinterfaces of C, but include only instance methods.</li>
1853 * </ol></li>
1854 * <li> Union from step 1 is partitioned into subsets of methods with same
1855 * signature (name, parameter types) and return type.</li>
1856 * <li> Within each such subset only the most specific methods are selected.
1857 * Let method M be a method from a set of methods with same signature
1858 * and return type. M is most specific if there is no such method
1859 * N != M from the same set, such that N is more specific than M.
1860 * N is more specific than M if:
1861 * <ol type="a">
1862 * <li> N is declared by a class and M is declared by an interface; or</li>
1863 * <li> N and M are both declared by classes or both by interfaces and
1864 * N's declaring type is the same as or a subtype of M's declaring type
1865 * (clearly, if M's and N's declaring types are the same type, then
1866 * M and N are the same method).</li>
1867 * </ol></li>
1868 * <li> The result of this algorithm is the union of all selected methods from
1869 * step 3.</li>
1870 * </ol>
1871 *
1872 * @apiNote There may be more than one method with a particular name
1873 * and parameter types in a class because while the Java language forbids a
1874 * class to declare multiple methods with the same signature but different
1875 * return types, the Java virtual machine does not. This
1876 * increased flexibility in the virtual machine can be used to
1877 * implement various language features. For example, covariant
1878 * returns can be implemented with {@linkplain
1879 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1880 * method and the overriding method would have the same
1881 * signature but different return types.
1882 *
1883 * @return the array of {@code Method} objects representing the
1884 * public methods of this class
1885 * @throws SecurityException
1886 * If a security manager, <i>s</i>, is present and
1887 * the caller's class loader is not the same as or an
1888 * ancestor of the class loader for the current class and
1889 * invocation of {@link SecurityManager#checkPackageAccess
1890 * s.checkPackageAccess()} denies access to the package
1891 * of this class.
1892 *
1893 * @jls 8.2 Class Members
1894 * @jls 8.4 Method Declarations
1895 * @since 1.1
1896 */
1897 @CallerSensitive
1898 public Method[] getMethods() throws SecurityException {
1899 SecurityManager sm = System.getSecurityManager();
1900 if (sm != null) {
1901 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1902 }
1903 return copyMethods(privateGetPublicMethods());
1904 }
1905
1906
1907 /**
1908 * Returns an array containing {@code Constructor} objects reflecting
1909 * all the public constructors of the class represented by this
1910 * {@code Class} object. An array of length 0 is returned if the
1911 * class has no public constructors, or if the class is an array class, or
1912 * if the class reflects a primitive type or void.
1913 *
1914 * Note that while this method returns an array of {@code
1915 * Constructor<T>} objects (that is an array of constructors from
1916 * this class), the return type of this method is {@code
1917 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1918 * might be expected. This less informative return type is
1919 * necessary since after being returned from this method, the
1920 * array could be modified to hold {@code Constructor} objects for
1921 * different classes, which would violate the type guarantees of
1922 * {@code Constructor<T>[]}.
1923 *
1924 * @return the array of {@code Constructor} objects representing the
1925 * public constructors of this class
1926 * @throws SecurityException
1927 * If a security manager, <i>s</i>, is present and
1928 * the caller's class loader is not the same as or an
1929 * ancestor of the class loader for the current class and
1930 * invocation of {@link SecurityManager#checkPackageAccess
1931 * s.checkPackageAccess()} denies access to the package
1932 * of this class.
1933 *
1934 * @since 1.1
1935 */
1936 @CallerSensitive
1937 public Constructor<?>[] getConstructors() throws SecurityException {
1938 SecurityManager sm = System.getSecurityManager();
1939 if (sm != null) {
1940 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1941 }
1942 return copyConstructors(privateGetDeclaredConstructors(true));
1943 }
1944
1945
1946 /**
1947 * Returns a {@code Field} object that reflects the specified public member
1948 * field of the class or interface represented by this {@code Class}
1949 * object. The {@code name} parameter is a {@code String} specifying the
1950 * simple name of the desired field.
1951 *
1952 * <p> The field to be reflected is determined by the algorithm that
1953 * follows. Let C be the class or interface represented by this object:
1954 *
1955 * <OL>
1956 * <LI> If C declares a public field with the name specified, that is the
1957 * field to be reflected.</LI>
1958 * <LI> If no field was found in step 1 above, this algorithm is applied
1959 * recursively to each direct superinterface of C. The direct
1960 * superinterfaces are searched in the order they were declared.</LI>
1961 * <LI> If no field was found in steps 1 and 2 above, and C has a
1962 * superclass S, then this algorithm is invoked recursively upon S.
1963 * If C has no superclass, then a {@code NoSuchFieldException}
1964 * is thrown.</LI>
1965 * </OL>
1966 *
1967 * <p> If this {@code Class} object represents an array type, then this
1968 * method does not find the {@code length} field of the array type.
1969 *
1970 * @param name the field name
1971 * @return the {@code Field} object of this class specified by
1972 * {@code name}
1973 * @throws NoSuchFieldException if a field with the specified name is
1974 * not found.
1975 * @throws NullPointerException if {@code name} is {@code null}
1976 * @throws SecurityException
1977 * If a security manager, <i>s</i>, is present and
1978 * the caller's class loader is not the same as or an
1979 * ancestor of the class loader for the current class and
1980 * invocation of {@link SecurityManager#checkPackageAccess
1981 * s.checkPackageAccess()} denies access to the package
1982 * of this class.
1983 *
1984 * @since 1.1
1985 * @jls 8.2 Class Members
1986 * @jls 8.3 Field Declarations
1987 */
1988 @CallerSensitive
1989 public Field getField(String name)
1990 throws NoSuchFieldException, SecurityException {
1991 Objects.requireNonNull(name);
1992 SecurityManager sm = System.getSecurityManager();
1993 if (sm != null) {
1994 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1995 }
1996 Field field = getField0(name);
1997 if (field == null) {
1998 throw new NoSuchFieldException(name);
1999 }
2000 return getReflectionFactory().copyField(field);
2001 }
2002
2003
2004 /**
2005 * Returns a {@code Method} object that reflects the specified public
2006 * member method of the class or interface represented by this
2007 * {@code Class} object. The {@code name} parameter is a
2008 * {@code String} specifying the simple name of the desired method. The
2009 * {@code parameterTypes} parameter is an array of {@code Class}
2010 * objects that identify the method's formal parameter types, in declared
2011 * order. If {@code parameterTypes} is {@code null}, it is
2012 * treated as if it were an empty array.
2013 *
2014 * <p> If this {@code Class} object represents an array type, then this
2015 * method finds any public method inherited by the array type from
2016 * {@code Object} except method {@code clone()}.
2017 *
2018 * <p> If this {@code Class} object represents an interface then this
2019 * method does not find any implicitly declared method from
2020 * {@code Object}. Therefore, if no methods are explicitly declared in
2021 * this interface or any of its superinterfaces, then this method does not
2022 * find any method.
2023 *
2024 * <p> This method does not find any method with name "{@code <init>}" or
2025 * "{@code <clinit>}".
2026 *
2027 * <p> Generally, the method to be reflected is determined by the 4 step
2028 * algorithm that follows.
2029 * Let C be the class or interface represented by this {@code Class} object:
2030 * <ol>
2031 * <li> A union of methods is composed of:
2032 * <ol type="a">
2033 * <li> C's declared public instance and static methods as returned by
2034 * {@link #getDeclaredMethods()} and filtered to include only public
2035 * methods that match given {@code name} and {@code parameterTypes}</li>
2036 * <li> If C is a class other than {@code Object}, then include the result
2037 * of invoking this algorithm recursively on the superclass of C.</li>
2038 * <li> Include the results of invoking this algorithm recursively on all
2039 * direct superinterfaces of C, but include only instance methods.</li>
2040 * </ol></li>
2041 * <li> This union is partitioned into subsets of methods with same
2042 * return type (the selection of methods from step 1 also guarantees that
2043 * they have the same method name and parameter types).</li>
2044 * <li> Within each such subset only the most specific methods are selected.
2045 * Let method M be a method from a set of methods with same VM
2046 * signature (return type, name, parameter types).
2047 * M is most specific if there is no such method N != M from the same
2048 * set, such that N is more specific than M. N is more specific than M
2049 * if:
2050 * <ol type="a">
2051 * <li> N is declared by a class and M is declared by an interface; or</li>
2052 * <li> N and M are both declared by classes or both by interfaces and
2053 * N's declaring type is the same as or a subtype of M's declaring type
2054 * (clearly, if M's and N's declaring types are the same type, then
2055 * M and N are the same method).</li>
2056 * </ol></li>
2057 * <li> The result of this algorithm is chosen arbitrarily from the methods
2058 * with most specific return type among all selected methods from step 3.
2059 * Let R be a return type of a method M from the set of all selected methods
2060 * from step 3. M is a method with most specific return type if there is
2061 * no such method N != M from the same set, having return type S != R,
2062 * such that S is a subtype of R as determined by
2063 * R.class.{@link #isAssignableFrom}(S.class).
2064 * </ol>
2065 *
2066 * @apiNote There may be more than one method with matching name and
2067 * parameter types in a class because while the Java language forbids a
2068 * class to declare multiple methods with the same signature but different
2069 * return types, the Java virtual machine does not. This
2070 * increased flexibility in the virtual machine can be used to
2071 * implement various language features. For example, covariant
2072 * returns can be implemented with {@linkplain
2073 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
2074 * method and the overriding method would have the same
2075 * signature but different return types. This method would return the
2076 * overriding method as it would have a more specific return type.
2077 *
2078 * @param name the name of the method
2079 * @param parameterTypes the list of parameters
2080 * @return the {@code Method} object that matches the specified
2081 * {@code name} and {@code parameterTypes}
2082 * @throws NoSuchMethodException if a matching method is not found
2083 * or if the name is "<init>"or "<clinit>".
2084 * @throws NullPointerException if {@code name} is {@code null}
2085 * @throws SecurityException
2086 * If a security manager, <i>s</i>, is present and
2087 * the caller's class loader is not the same as or an
2088 * ancestor of the class loader for the current class and
2089 * invocation of {@link SecurityManager#checkPackageAccess
2090 * s.checkPackageAccess()} denies access to the package
2091 * of this class.
2092 *
2093 * @jls 8.2 Class Members
2094 * @jls 8.4 Method Declarations
2095 * @since 1.1
2096 */
2097 @CallerSensitive
2098 public Method getMethod(String name, Class<?>... parameterTypes)
2099 throws NoSuchMethodException, SecurityException {
2100 Objects.requireNonNull(name);
2101 SecurityManager sm = System.getSecurityManager();
2102 if (sm != null) {
2103 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
2104 }
2105 Method method = getMethod0(name, parameterTypes);
2106 if (method == null) {
2107 throw new NoSuchMethodException(methodToString(name, parameterTypes));
2108 }
2109 return getReflectionFactory().copyMethod(method);
2110 }
2111
2112 /**
2113 * Returns a {@code Constructor} object that reflects the specified
2114 * public constructor of the class represented by this {@code Class}
2115 * object. The {@code parameterTypes} parameter is an array of
2116 * {@code Class} objects that identify the constructor's formal
2117 * parameter types, in declared order.
2118 *
2119 * If this {@code Class} object represents an inner class
2120 * declared in a non-static context, the formal parameter types
2121 * include the explicit enclosing instance as the first parameter.
2122 *
2123 * <p> The constructor to reflect is the public constructor of the class
2124 * represented by this {@code Class} object whose formal parameter
2125 * types match those specified by {@code parameterTypes}.
2126 *
2127 * @param parameterTypes the parameter array
2128 * @return the {@code Constructor} object of the public constructor that
2129 * matches the specified {@code parameterTypes}
2130 * @throws NoSuchMethodException if a matching method is not found.
2131 * @throws SecurityException
2132 * If a security manager, <i>s</i>, is present and
2133 * the caller's class loader is not the same as or an
2134 * ancestor of the class loader for the current class and
2135 * invocation of {@link SecurityManager#checkPackageAccess
2136 * s.checkPackageAccess()} denies access to the package
2137 * of this class.
2138 *
2139 * @since 1.1
2140 */
2141 @CallerSensitive
2142 public Constructor<T> getConstructor(Class<?>... parameterTypes)
2143 throws NoSuchMethodException, SecurityException
2144 {
2145 SecurityManager sm = System.getSecurityManager();
2146 if (sm != null) {
2147 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
2148 }
2149 return getReflectionFactory().copyConstructor(
2150 getConstructor0(parameterTypes, Member.PUBLIC));
2151 }
2152
2153
2154 /**
2155 * Returns an array of {@code Class} objects reflecting all the
2156 * classes and interfaces declared as members of the class represented by
2157 * this {@code Class} object. This includes public, protected, default
2158 * (package) access, and private classes and interfaces declared by the
2159 * class, but excludes inherited classes and interfaces. This method
2160 * returns an array of length 0 if the class declares no classes or
2161 * interfaces as members, or if this {@code Class} object represents a
2162 * primitive type, an array class, or void.
2163 *
2164 * @return the array of {@code Class} objects representing all the
2165 * declared members of this class
2166 * @throws SecurityException
2167 * If a security manager, <i>s</i>, is present and any of the
2168 * following conditions is met:
2169 *
2170 * <ul>
2171 *
2172 * <li> the caller's class loader is not the same as the
2173 * class loader of this class and invocation of
2174 * {@link SecurityManager#checkPermission
2175 * s.checkPermission} method with
2176 * {@code RuntimePermission("accessDeclaredMembers")}
2177 * denies access to the declared classes within this class
2178 *
2179 * <li> the caller's class loader is not the same as or an
2180 * ancestor of the class loader for the current class and
2181 * invocation of {@link SecurityManager#checkPackageAccess
2182 * s.checkPackageAccess()} denies access to the package
2183 * of this class
2184 *
2185 * </ul>
2186 *
2187 * @since 1.1
2188 */
2189 @CallerSensitive
2190 public Class<?>[] getDeclaredClasses() throws SecurityException {
2191 SecurityManager sm = System.getSecurityManager();
2192 if (sm != null) {
2193 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), false);
2194 }
2195 return getDeclaredClasses0();
2196 }
2197
2198
2199 /**
2200 * Returns an array of {@code Field} objects reflecting all the fields
2201 * declared by the class or interface represented by this
2202 * {@code Class} object. This includes public, protected, default
2203 * (package) access, and private fields, but excludes inherited fields.
2204 *
2205 * <p> If this {@code Class} object represents a class or interface with no
2206 * declared fields, then this method returns an array of length 0.
2207 *
2208 * <p> If this {@code Class} object represents an array type, a primitive
2209 * type, or void, then this method returns an array of length 0.
2210 *
2211 * <p> The elements in the returned array are not sorted and are not in any
2212 * particular order.
2213 *
2214 * @return the array of {@code Field} objects representing all the
2215 * declared fields of this class
2216 * @throws SecurityException
2217 * If a security manager, <i>s</i>, is present and any of the
2218 * following conditions is met:
2219 *
2220 * <ul>
2221 *
2222 * <li> the caller's class loader is not the same as the
2223 * class loader of this class and invocation of
2224 * {@link SecurityManager#checkPermission
2225 * s.checkPermission} method with
2226 * {@code RuntimePermission("accessDeclaredMembers")}
2227 * denies access to the declared fields within this class
2228 *
2229 * <li> the caller's class loader is not the same as or an
2230 * ancestor of the class loader for the current class and
2231 * invocation of {@link SecurityManager#checkPackageAccess
2232 * s.checkPackageAccess()} denies access to the package
2233 * of this class
2234 *
2235 * </ul>
2236 *
2237 * @since 1.1
2238 * @jls 8.2 Class Members
2239 * @jls 8.3 Field Declarations
2240 */
2241 @CallerSensitive
2242 public Field[] getDeclaredFields() throws SecurityException {
2243 SecurityManager sm = System.getSecurityManager();
2244 if (sm != null) {
2245 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2246 }
2247 return copyFields(privateGetDeclaredFields(false));
2248 }
2249
2250
2251 /**
2252 * Returns an array containing {@code Method} objects reflecting all the
2253 * declared methods of the class or interface represented by this {@code
2254 * Class} object, including public, protected, default (package)
2255 * access, and private methods, but excluding inherited methods.
2256 *
2257 * <p> If this {@code Class} object represents a type that has multiple
2258 * declared methods with the same name and parameter types, but different
2259 * return types, then the returned array has a {@code Method} object for
2260 * each such method.
2261 *
2262 * <p> If this {@code Class} object represents a type that has a class
2263 * initialization method {@code <clinit>}, then the returned array does
2264 * <em>not</em> have a corresponding {@code Method} object.
2265 *
2266 * <p> If this {@code Class} object represents a class or interface with no
2267 * declared methods, then the returned array has length 0.
2268 *
2269 * <p> If this {@code Class} object represents an array type, a primitive
2270 * type, or void, then the returned array has length 0.
2271 *
2272 * <p> The elements in the returned array are not sorted and are not in any
2273 * particular order.
2274 *
2275 * @return the array of {@code Method} objects representing all the
2276 * declared methods of this class
2277 * @throws SecurityException
2278 * If a security manager, <i>s</i>, is present and any of the
2279 * following conditions is met:
2280 *
2281 * <ul>
2282 *
2283 * <li> the caller's class loader is not the same as the
2284 * class loader of this class and invocation of
2285 * {@link SecurityManager#checkPermission
2286 * s.checkPermission} method with
2287 * {@code RuntimePermission("accessDeclaredMembers")}
2288 * denies access to the declared methods within this class
2289 *
2290 * <li> the caller's class loader is not the same as or an
2291 * ancestor of the class loader for the current class and
2292 * invocation of {@link SecurityManager#checkPackageAccess
2293 * s.checkPackageAccess()} denies access to the package
2294 * of this class
2295 *
2296 * </ul>
2297 *
2298 * @jls 8.2 Class Members
2299 * @jls 8.4 Method Declarations
2300 * @since 1.1
2301 */
2302 @CallerSensitive
2303 public Method[] getDeclaredMethods() throws SecurityException {
2304 SecurityManager sm = System.getSecurityManager();
2305 if (sm != null) {
2306 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2307 }
2308 return copyMethods(privateGetDeclaredMethods(false));
2309 }
2310
2311
2312 /**
2313 * Returns an array of {@code Constructor} objects reflecting all the
2314 * constructors declared by the class represented by this
2315 * {@code Class} object. These are public, protected, default
2316 * (package) access, and private constructors. The elements in the array
2317 * returned are not sorted and are not in any particular order. If the
2318 * class has a default constructor, it is included in the returned array.
2319 * This method returns an array of length 0 if this {@code Class}
2320 * object represents an interface, a primitive type, an array class, or
2321 * void.
2322 *
2323 * <p> See <em>The Java Language Specification</em>, section 8.2.
2324 *
2325 * @return the array of {@code Constructor} objects representing all the
2326 * declared constructors of this class
2327 * @throws SecurityException
2328 * If a security manager, <i>s</i>, is present and any of the
2329 * following conditions is met:
2330 *
2331 * <ul>
2332 *
2333 * <li> the caller's class loader is not the same as the
2334 * class loader of this class and invocation of
2335 * {@link SecurityManager#checkPermission
2336 * s.checkPermission} method with
2337 * {@code RuntimePermission("accessDeclaredMembers")}
2338 * denies access to the declared constructors within this class
2339 *
2340 * <li> the caller's class loader is not the same as or an
2341 * ancestor of the class loader for the current class and
2342 * invocation of {@link SecurityManager#checkPackageAccess
2343 * s.checkPackageAccess()} denies access to the package
2344 * of this class
2345 *
2346 * </ul>
2347 *
2348 * @since 1.1
2349 */
2350 @CallerSensitive
2351 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
2352 SecurityManager sm = System.getSecurityManager();
2353 if (sm != null) {
2354 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2355 }
2356 return copyConstructors(privateGetDeclaredConstructors(false));
2357 }
2358
2359
2360 /**
2361 * Returns a {@code Field} object that reflects the specified declared
2362 * field of the class or interface represented by this {@code Class}
2363 * object. The {@code name} parameter is a {@code String} that specifies
2364 * the simple name of the desired field.
2365 *
2366 * <p> If this {@code Class} object represents an array type, then this
2367 * method does not find the {@code length} field of the array type.
2368 *
2369 * @param name the name of the field
2370 * @return the {@code Field} object for the specified field in this
2371 * class
2372 * @throws NoSuchFieldException if a field with the specified name is
2373 * not found.
2374 * @throws NullPointerException if {@code name} is {@code null}
2375 * @throws SecurityException
2376 * If a security manager, <i>s</i>, is present and any of the
2377 * following conditions is met:
2378 *
2379 * <ul>
2380 *
2381 * <li> the caller's class loader is not the same as the
2382 * class loader of this class and invocation of
2383 * {@link SecurityManager#checkPermission
2384 * s.checkPermission} method with
2385 * {@code RuntimePermission("accessDeclaredMembers")}
2386 * denies access to the declared field
2387 *
2388 * <li> the caller's class loader is not the same as or an
2389 * ancestor of the class loader for the current class and
2390 * invocation of {@link SecurityManager#checkPackageAccess
2391 * s.checkPackageAccess()} denies access to the package
2392 * of this class
2393 *
2394 * </ul>
2395 *
2396 * @since 1.1
2397 * @jls 8.2 Class Members
2398 * @jls 8.3 Field Declarations
2399 */
2400 @CallerSensitive
2401 public Field getDeclaredField(String name)
2402 throws NoSuchFieldException, SecurityException {
2403 Objects.requireNonNull(name);
2404 SecurityManager sm = System.getSecurityManager();
2405 if (sm != null) {
2406 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2407 }
2408 Field field = searchFields(privateGetDeclaredFields(false), name);
2409 if (field == null) {
2410 throw new NoSuchFieldException(name);
2411 }
2412 return getReflectionFactory().copyField(field);
2413 }
2414
2415
2416 /**
2417 * Returns a {@code Method} object that reflects the specified
2418 * declared method of the class or interface represented by this
2419 * {@code Class} object. The {@code name} parameter is a
2420 * {@code String} that specifies the simple name of the desired
2421 * method, and the {@code parameterTypes} parameter is an array of
2422 * {@code Class} objects that identify the method's formal parameter
2423 * types, in declared order. If more than one method with the same
2424 * parameter types is declared in a class, and one of these methods has a
2425 * return type that is more specific than any of the others, that method is
2426 * returned; otherwise one of the methods is chosen arbitrarily. If the
2427 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
2428 * is raised.
2429 *
2430 * <p> If this {@code Class} object represents an array type, then this
2431 * method does not find the {@code clone()} method.
2432 *
2433 * @param name the name of the method
2434 * @param parameterTypes the parameter array
2435 * @return the {@code Method} object for the method of this class
2436 * matching the specified name and parameters
2437 * @throws NoSuchMethodException if a matching method is not found.
2438 * @throws NullPointerException if {@code name} is {@code null}
2439 * @throws SecurityException
2440 * If a security manager, <i>s</i>, is present and any of the
2441 * following conditions is met:
2442 *
2443 * <ul>
2444 *
2445 * <li> the caller's class loader is not the same as the
2446 * class loader of this class and invocation of
2447 * {@link SecurityManager#checkPermission
2448 * s.checkPermission} method with
2449 * {@code RuntimePermission("accessDeclaredMembers")}
2450 * denies access to the declared method
2451 *
2452 * <li> the caller's class loader is not the same as or an
2453 * ancestor of the class loader for the current class and
2454 * invocation of {@link SecurityManager#checkPackageAccess
2455 * s.checkPackageAccess()} denies access to the package
2456 * of this class
2457 *
2458 * </ul>
2459 *
2460 * @jls 8.2 Class Members
2461 * @jls 8.4 Method Declarations
2462 * @since 1.1
2463 */
2464 @CallerSensitive
2465 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
2466 throws NoSuchMethodException, SecurityException {
2467 Objects.requireNonNull(name);
2468 SecurityManager sm = System.getSecurityManager();
2469 if (sm != null) {
2470 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2471 }
2472 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
2473 if (method == null) {
2474 throw new NoSuchMethodException(methodToString(name, parameterTypes));
2475 }
2476 return getReflectionFactory().copyMethod(method);
2477 }
2478
2479 /**
2480 * Returns the list of {@code Method} objects for the declared public
2481 * methods of this class or interface that have the specified method name
2482 * and parameter types.
2483 *
2484 * @param name the name of the method
2485 * @param parameterTypes the parameter array
2486 * @return the list of {@code Method} objects for the public methods of
2487 * this class matching the specified name and parameters
2488 */
2489 List<Method> getDeclaredPublicMethods(String name, Class<?>... parameterTypes) {
2490 Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
2491 ReflectionFactory factory = getReflectionFactory();
2492 List<Method> result = new ArrayList<>();
2493 for (Method method : methods) {
2494 if (method.getName().equals(name)
2495 && Arrays.equals(
2496 factory.getExecutableSharedParameterTypes(method),
2497 parameterTypes)) {
2498 result.add(factory.copyMethod(method));
2499 }
2500 }
2501 return result;
2502 }
2503
2504 /**
2505 * Returns a {@code Constructor} object that reflects the specified
2506 * constructor of the class or interface represented by this
2507 * {@code Class} object. The {@code parameterTypes} parameter is
2508 * an array of {@code Class} objects that identify the constructor's
2509 * formal parameter types, in declared order.
2510 *
2511 * If this {@code Class} object represents an inner class
2512 * declared in a non-static context, the formal parameter types
2513 * include the explicit enclosing instance as the first parameter.
2514 *
2515 * @param parameterTypes the parameter array
2516 * @return The {@code Constructor} object for the constructor with the
2517 * specified parameter list
2518 * @throws NoSuchMethodException if a matching method is not found.
2519 * @throws SecurityException
2520 * If a security manager, <i>s</i>, is present and any of the
2521 * following conditions is met:
2522 *
2523 * <ul>
2524 *
2525 * <li> the caller's class loader is not the same as the
2526 * class loader of this class and invocation of
2527 * {@link SecurityManager#checkPermission
2528 * s.checkPermission} method with
2529 * {@code RuntimePermission("accessDeclaredMembers")}
2530 * denies access to the declared constructor
2531 *
2532 * <li> the caller's class loader is not the same as or an
2533 * ancestor of the class loader for the current class and
2534 * invocation of {@link SecurityManager#checkPackageAccess
2535 * s.checkPackageAccess()} denies access to the package
2536 * of this class
2537 *
2538 * </ul>
2539 *
2540 * @since 1.1
2541 */
2542 @CallerSensitive
2543 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
2544 throws NoSuchMethodException, SecurityException
2545 {
2546 SecurityManager sm = System.getSecurityManager();
2547 if (sm != null) {
2548 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2549 }
2550
2551 return getReflectionFactory().copyConstructor(
2552 getConstructor0(parameterTypes, Member.DECLARED));
2553 }
2554
2555 /**
2556 * Finds a resource with a given name.
2557 *
2558 * <p> If this class is in a named {@link Module Module} then this method
2559 * will attempt to find the resource in the module. This is done by
2560 * delegating to the module's class loader {@link
2561 * ClassLoader#findResource(String,String) findResource(String,String)}
2562 * method, invoking it with the module name and the absolute name of the
2563 * resource. Resources in named modules are subject to the rules for
2564 * encapsulation specified in the {@code Module} {@link
2565 * Module#getResourceAsStream getResourceAsStream} method and so this
2566 * method returns {@code null} when the resource is a
2567 * non-"{@code .class}" resource in a package that is not open to the
2568 * caller's module.
2569 *
2570 * <p> Otherwise, if this class is not in a named module then the rules for
2571 * searching resources associated with a given class are implemented by the
2572 * defining {@linkplain ClassLoader class loader} of the class. This method
2573 * delegates to this object's class loader. If this object was loaded by
2574 * the bootstrap class loader, the method delegates to {@link
2575 * ClassLoader#getSystemResourceAsStream}.
2576 *
2577 * <p> Before delegation, an absolute resource name is constructed from the
2578 * given resource name using this algorithm:
2579 *
2580 * <ul>
2581 *
2582 * <li> If the {@code name} begins with a {@code '/'}
2583 * (<code>'\u002f'</code>), then the absolute name of the resource is the
2584 * portion of the {@code name} following the {@code '/'}.
2585 *
2586 * <li> Otherwise, the absolute name is of the following form:
2587 *
2588 * <blockquote>
2589 * {@code modified_package_name/name}
2590 * </blockquote>
2591 *
2592 * <p> Where the {@code modified_package_name} is the package name of this
2593 * object with {@code '/'} substituted for {@code '.'}
2594 * (<code>'\u002e'</code>).
2595 *
2596 * </ul>
2597 *
2598 * @param name name of the desired resource
2599 * @return A {@link java.io.InputStream} object; {@code null} if no
2600 * resource with this name is found, the resource is in a package
2601 * that is not {@linkplain Module#isOpen(String, Module) open} to at
2602 * least the caller module, or access to the resource is denied
2603 * by the security manager.
2604 * @throws NullPointerException If {@code name} is {@code null}
2605 *
2606 * @see Module#getResourceAsStream(String)
2607 * @since 1.1
2608 * @revised 9
2609 * @spec JPMS
2610 */
2611 @CallerSensitive
2612 public InputStream getResourceAsStream(String name) {
2613 name = resolveName(name);
2614
2615 Module thisModule = getModule();
2616 if (thisModule.isNamed()) {
2617 // check if resource can be located by caller
2618 if (Resources.canEncapsulate(name)
2619 && !isOpenToCaller(name, Reflection.getCallerClass())) {
2620 return null;
2621 }
2622
2623 // resource not encapsulated or in package open to caller
2624 String mn = thisModule.getName();
2625 ClassLoader cl = getClassLoader0();
2626 try {
2627
2628 // special-case built-in class loaders to avoid the
2629 // need for a URL connection
2630 if (cl == null) {
2631 return BootLoader.findResourceAsStream(mn, name);
2632 } else if (cl instanceof BuiltinClassLoader) {
2633 return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name);
2634 } else {
2635 URL url = cl.findResource(mn, name);
2636 return (url != null) ? url.openStream() : null;
2637 }
2638
2639 } catch (IOException | SecurityException e) {
2640 return null;
2641 }
2642 }
2643
2644 // unnamed module
2645 ClassLoader cl = getClassLoader0();
2646 if (cl == null) {
2647 return ClassLoader.getSystemResourceAsStream(name);
2648 } else {
2649 return cl.getResourceAsStream(name);
2650 }
2651 }
2652
2653 /**
2654 * Finds a resource with a given name.
2655 *
2656 * <p> If this class is in a named {@link Module Module} then this method
2657 * will attempt to find the resource in the module. This is done by
2658 * delegating to the module's class loader {@link
2659 * ClassLoader#findResource(String,String) findResource(String,String)}
2660 * method, invoking it with the module name and the absolute name of the
2661 * resource. Resources in named modules are subject to the rules for
2662 * encapsulation specified in the {@code Module} {@link
2663 * Module#getResourceAsStream getResourceAsStream} method and so this
2664 * method returns {@code null} when the resource is a
2665 * non-"{@code .class}" resource in a package that is not open to the
2666 * caller's module.
2667 *
2668 * <p> Otherwise, if this class is not in a named module then the rules for
2669 * searching resources associated with a given class are implemented by the
2670 * defining {@linkplain ClassLoader class loader} of the class. This method
2671 * delegates to this object's class loader. If this object was loaded by
2672 * the bootstrap class loader, the method delegates to {@link
2673 * ClassLoader#getSystemResource}.
2674 *
2675 * <p> Before delegation, an absolute resource name is constructed from the
2676 * given resource name using this algorithm:
2677 *
2678 * <ul>
2679 *
2680 * <li> If the {@code name} begins with a {@code '/'}
2681 * (<code>'\u002f'</code>), then the absolute name of the resource is the
2682 * portion of the {@code name} following the {@code '/'}.
2683 *
2684 * <li> Otherwise, the absolute name is of the following form:
2685 *
2686 * <blockquote>
2687 * {@code modified_package_name/name}
2688 * </blockquote>
2689 *
2690 * <p> Where the {@code modified_package_name} is the package name of this
2691 * object with {@code '/'} substituted for {@code '.'}
2692 * (<code>'\u002e'</code>).
2693 *
2694 * </ul>
2695 *
2696 * @param name name of the desired resource
2697 * @return A {@link java.net.URL} object; {@code null} if no resource with
2698 * this name is found, the resource cannot be located by a URL, the
2699 * resource is in a package that is not
2700 * {@linkplain Module#isOpen(String, Module) open} to at least the caller
2701 * module, or access to the resource is denied by the security
2702 * manager.
2703 * @throws NullPointerException If {@code name} is {@code null}
2704 * @since 1.1
2705 * @revised 9
2706 * @spec JPMS
2707 */
2708 @CallerSensitive
2709 public URL getResource(String name) {
2710 name = resolveName(name);
2711
2712 Module thisModule = getModule();
2713 if (thisModule.isNamed()) {
2714 // check if resource can be located by caller
2715 if (Resources.canEncapsulate(name)
2716 && !isOpenToCaller(name, Reflection.getCallerClass())) {
2717 return null;
2718 }
2719
2720 // resource not encapsulated or in package open to caller
2721 String mn = thisModule.getName();
2722 ClassLoader cl = getClassLoader0();
2723 try {
2724 if (cl == null) {
2725 return BootLoader.findResource(mn, name);
2726 } else {
2727 return cl.findResource(mn, name);
2728 }
2729 } catch (IOException ioe) {
2730 return null;
2731 }
2732 }
2733
2734 // unnamed module
2735 ClassLoader cl = getClassLoader0();
2736 if (cl == null) {
2737 return ClassLoader.getSystemResource(name);
2738 } else {
2739 return cl.getResource(name);
2740 }
2741 }
2742
2743 /**
2744 * Returns true if a resource with the given name can be located by the
2745 * given caller. All resources in a module can be located by code in
2746 * the module. For other callers, then the package needs to be open to
2747 * the caller.
2748 */
2749 private boolean isOpenToCaller(String name, Class<?> caller) {
2750 // assert getModule().isNamed();
2751 Module thisModule = getModule();
2752 Module callerModule = (caller != null) ? caller.getModule() : null;
2753 if (callerModule != thisModule) {
2754 String pn = Resources.toPackageName(name);
2755 if (thisModule.getDescriptor().packages().contains(pn)) {
2756 if (callerModule == null && !thisModule.isOpen(pn)) {
2757 // no caller, package not open
2758 return false;
2759 }
2760 if (!thisModule.isOpen(pn, callerModule)) {
2761 // package not open to caller
2762 return false;
2763 }
2764 }
2765 }
2766 return true;
2767 }
2768
2769
2770 /** protection domain returned when the internal domain is null */
2771 private static java.security.ProtectionDomain allPermDomain;
2772
2773 /**
2774 * Returns the {@code ProtectionDomain} of this class. If there is a
2775 * security manager installed, this method first calls the security
2776 * manager's {@code checkPermission} method with a
2777 * {@code RuntimePermission("getProtectionDomain")} permission to
2778 * ensure it's ok to get the
2779 * {@code ProtectionDomain}.
2780 *
2781 * @return the ProtectionDomain of this class
2782 *
2783 * @throws SecurityException
2784 * if a security manager exists and its
2785 * {@code checkPermission} method doesn't allow
2786 * getting the ProtectionDomain.
2787 *
2788 * @see java.security.ProtectionDomain
2789 * @see SecurityManager#checkPermission
2790 * @see java.lang.RuntimePermission
2791 * @since 1.2
2792 */
2793 public java.security.ProtectionDomain getProtectionDomain() {
2794 SecurityManager sm = System.getSecurityManager();
2795 if (sm != null) {
2796 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2797 }
2798 java.security.ProtectionDomain pd = getProtectionDomain0();
2799 if (pd == null) {
2800 if (allPermDomain == null) {
2801 java.security.Permissions perms =
2802 new java.security.Permissions();
2803 perms.add(SecurityConstants.ALL_PERMISSION);
2804 allPermDomain =
2805 new java.security.ProtectionDomain(null, perms);
2806 }
2807 pd = allPermDomain;
2808 }
2809 return pd;
2810 }
2811
2812
2813 /**
2814 * Returns the ProtectionDomain of this class.
2815 */
2816 private native java.security.ProtectionDomain getProtectionDomain0();
2817
2818 /*
2819 * Return the Virtual Machine's Class object for the named
2820 * primitive type.
2821 */
2822 static native Class<?> getPrimitiveClass(String name);
2823
2824 /*
2825 * Check if client is allowed to access members. If access is denied,
2826 * throw a SecurityException.
2827 *
2828 * This method also enforces package access.
2829 *
2830 * <p> Default policy: allow all clients access with normal Java access
2831 * control.
2832 *
2833 * <p> NOTE: should only be called if a SecurityManager is installed
2834 */
2835 private void checkMemberAccess(SecurityManager sm, int which,
2836 Class<?> caller, boolean checkProxyInterfaces) {
2837 /* Default policy allows access to all {@link Member#PUBLIC} members,
2838 * as well as access to classes that have the same class loader as the caller.
2839 * In all other cases, it requires RuntimePermission("accessDeclaredMembers")
2840 * permission.
2841 */
2842 final ClassLoader ccl = ClassLoader.getClassLoader(caller);
2843 if (which != Member.PUBLIC) {
2844 final ClassLoader cl = getClassLoader0();
2845 if (ccl != cl) {
2846 sm.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
2847 }
2848 }
2849 this.checkPackageAccess(sm, ccl, checkProxyInterfaces);
2850 }
2851
2852 /*
2853 * Checks if a client loaded in ClassLoader ccl is allowed to access this
2854 * class under the current package access policy. If access is denied,
2855 * throw a SecurityException.
2856 *
2857 * NOTE: this method should only be called if a SecurityManager is active
2858 */
2859 private void checkPackageAccess(SecurityManager sm, final ClassLoader ccl,
2860 boolean checkProxyInterfaces) {
2861 final ClassLoader cl = getClassLoader0();
2862
2863 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2864 String pkg = this.getPackageName();
2865 if (pkg != null && !pkg.isEmpty()) {
2866 // skip the package access check on a proxy class in default proxy package
2867 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
2868 sm.checkPackageAccess(pkg);
2869 }
2870 }
2871 }
2872 // check package access on the proxy interfaces
2873 if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
2874 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
2875 }
2876 }
2877
2878 /**
2879 * Add a package name prefix if the name is not absolute Remove leading "/"
2880 * if name is absolute
2881 */
2882 private String resolveName(String name) {
2883 if (!name.startsWith("/")) {
2884 Class<?> c = this;
2885 while (c.isArray()) {
2886 c = c.getComponentType();
2887 }
2888 String baseName = c.getPackageName();
2889 if (baseName != null && !baseName.isEmpty()) {
2890 name = baseName.replace('.', '/') + "/" + name;
2891 }
2892 } else {
2893 name = name.substring(1);
2894 }
2895 return name;
2896 }
2897
2898 /**
2899 * Atomic operations support.
2900 */
2901 private static class Atomic {
2902 // initialize Unsafe machinery here, since we need to call Class.class instance method
2903 // and have to avoid calling it in the static initializer of the Class class...
2904 private static final Unsafe unsafe = Unsafe.getUnsafe();
2905 // offset of Class.reflectionData instance field
2906 private static final long reflectionDataOffset
2907 = unsafe.objectFieldOffset(Class.class, "reflectionData");
2908 // offset of Class.annotationType instance field
2909 private static final long annotationTypeOffset
2910 = unsafe.objectFieldOffset(Class.class, "annotationType");
2911 // offset of Class.annotationData instance field
2912 private static final long annotationDataOffset
2913 = unsafe.objectFieldOffset(Class.class, "annotationData");
2914
2915 static <T> boolean casReflectionData(Class<?> clazz,
2916 SoftReference<ReflectionData<T>> oldData,
2917 SoftReference<ReflectionData<T>> newData) {
2918 return unsafe.compareAndSetObject(clazz, reflectionDataOffset, oldData, newData);
2919 }
2920
2921 static <T> boolean casAnnotationType(Class<?> clazz,
2922 AnnotationType oldType,
2923 AnnotationType newType) {
2924 return unsafe.compareAndSetObject(clazz, annotationTypeOffset, oldType, newType);
2925 }
2926
2927 static <T> boolean casAnnotationData(Class<?> clazz,
2928 AnnotationData oldData,
2929 AnnotationData newData) {
2930 return unsafe.compareAndSetObject(clazz, annotationDataOffset, oldData, newData);
2931 }
2932 }
2933
2934 /**
2935 * Reflection support.
2936 */
2937
2938 // Reflection data caches various derived names and reflective members. Cached
2939 // values may be invalidated when JVM TI RedefineClasses() is called
2940 private static class ReflectionData<T> {
2941 volatile Field[] declaredFields;
2942 volatile Field[] publicFields;
2943 volatile Method[] declaredMethods;
2944 volatile Method[] publicMethods;
2945 volatile Constructor<T>[] declaredConstructors;
2946 volatile Constructor<T>[] publicConstructors;
2947 // Intermediate results for getFields and getMethods
2948 volatile Field[] declaredPublicFields;
2949 volatile Method[] declaredPublicMethods;
2950 volatile Class<?>[] interfaces;
2951
2952 // Cached names
2953 String simpleName;
2954 String canonicalName;
2955 static final String NULL_SENTINEL = new String();
2956
2957 // Value of classRedefinedCount when we created this ReflectionData instance
2958 final int redefinedCount;
2959
2960 ReflectionData(int redefinedCount) {
2961 this.redefinedCount = redefinedCount;
2962 }
2963 }
2964
2965 private transient volatile SoftReference<ReflectionData<T>> reflectionData;
2966
2967 // Incremented by the VM on each call to JVM TI RedefineClasses()
2968 // that redefines this class or a superclass.
2969 private transient volatile int classRedefinedCount;
2970
2971 // Lazily create and cache ReflectionData
2972 private ReflectionData<T> reflectionData() {
2973 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
2974 int classRedefinedCount = this.classRedefinedCount;
2975 ReflectionData<T> rd;
2976 if (reflectionData != null &&
2977 (rd = reflectionData.get()) != null &&
2978 rd.redefinedCount == classRedefinedCount) {
2979 return rd;
2980 }
2981 // else no SoftReference or cleared SoftReference or stale ReflectionData
2982 // -> create and replace new instance
2983 return newReflectionData(reflectionData, classRedefinedCount);
2984 }
2985
2986 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
2987 int classRedefinedCount) {
2988 while (true) {
2989 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
2990 // try to CAS it...
2991 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
2992 return rd;
2993 }
2994 // else retry
2995 oldReflectionData = this.reflectionData;
2996 classRedefinedCount = this.classRedefinedCount;
2997 if (oldReflectionData != null &&
2998 (rd = oldReflectionData.get()) != null &&
2999 rd.redefinedCount == classRedefinedCount) {
3000 return rd;
3001 }
3002 }
3003 }
3004
3005 // Generic signature handling
3006 private native String getGenericSignature0();
3007
3008 // Generic info repository; lazily initialized
3009 private transient volatile ClassRepository genericInfo;
3010
3011 // accessor for factory
3012 private GenericsFactory getFactory() {
3013 // create scope and factory
3014 return CoreReflectionFactory.make(this, ClassScope.make(this));
3015 }
3016
3017 // accessor for generic info repository;
3018 // generic info is lazily initialized
3019 private ClassRepository getGenericInfo() {
3020 ClassRepository genericInfo = this.genericInfo;
3021 if (genericInfo == null) {
3022 String signature = getGenericSignature0();
3023 if (signature == null) {
3024 genericInfo = ClassRepository.NONE;
3025 } else {
3026 genericInfo = ClassRepository.make(signature, getFactory());
3027 }
3028 this.genericInfo = genericInfo;
3029 }
3030 return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
3031 }
3032
3033 // Annotations handling
3034 native byte[] getRawAnnotations();
3035 // Since 1.8
3036 native byte[] getRawTypeAnnotations();
3037 static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
3038 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
3039 }
3040
3041 native ConstantPool getConstantPool();
3042
3043 //
3044 //
3045 // java.lang.reflect.Field handling
3046 //
3047 //
3048
3049 // Returns an array of "root" fields. These Field objects must NOT
3050 // be propagated to the outside world, but must instead be copied
3051 // via ReflectionFactory.copyField.
3052 private Field[] privateGetDeclaredFields(boolean publicOnly) {
3053 Field[] res;
3054 ReflectionData<T> rd = reflectionData();
3055 if (rd != null) {
3056 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
3057 if (res != null) return res;
3058 }
3059 // No cached value available; request value from VM
3060 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
3061 if (rd != null) {
3062 if (publicOnly) {
3063 rd.declaredPublicFields = res;
3064 } else {
3065 rd.declaredFields = res;
3066 }
3067 }
3068 return res;
3069 }
3070
3071 // Returns an array of "root" fields. These Field objects must NOT
3072 // be propagated to the outside world, but must instead be copied
3073 // via ReflectionFactory.copyField.
3074 private Field[] privateGetPublicFields() {
3075 Field[] res;
3076 ReflectionData<T> rd = reflectionData();
3077 if (rd != null) {
3078 res = rd.publicFields;
3079 if (res != null) return res;
3080 }
3081
3082 // Use a linked hash set to ensure order is preserved and
3083 // fields from common super interfaces are not duplicated
3084 LinkedHashSet<Field> fields = new LinkedHashSet<>();
3085
3086 // Local fields
3087 addAll(fields, privateGetDeclaredFields(true));
3088
3089 // Direct superinterfaces, recursively
3090 for (Class<?> si : getInterfaces()) {
3091 addAll(fields, si.privateGetPublicFields());
3092 }
3093
3094 // Direct superclass, recursively
3095 Class<?> sc = getSuperclass();
3096 if (sc != null) {
3097 addAll(fields, sc.privateGetPublicFields());
3098 }
3099
3100 res = fields.toArray(new Field[0]);
3101 if (rd != null) {
3102 rd.publicFields = res;
3103 }
3104 return res;
3105 }
3106
3107 private static void addAll(Collection<Field> c, Field[] o) {
3108 for (Field f : o) {
3109 c.add(f);
3110 }
3111 }
3112
3113
3114 //
3115 //
3116 // java.lang.reflect.Constructor handling
3117 //
3118 //
3119
3120 // Returns an array of "root" constructors. These Constructor
3121 // objects must NOT be propagated to the outside world, but must
3122 // instead be copied via ReflectionFactory.copyConstructor.
3123 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
3124 Constructor<T>[] res;
3125 ReflectionData<T> rd = reflectionData();
3126 if (rd != null) {
3127 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
3128 if (res != null) return res;
3129 }
3130 // No cached value available; request value from VM
3131 if (isInterface()) {
3132 @SuppressWarnings("unchecked")
3133 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
3134 res = temporaryRes;
3135 } else {
3136 res = getDeclaredConstructors0(publicOnly);
3137 }
3138 if (rd != null) {
3139 if (publicOnly) {
3140 rd.publicConstructors = res;
3141 } else {
3142 rd.declaredConstructors = res;
3143 }
3144 }
3145 return res;
3146 }
3147
3148 //
3149 //
3150 // java.lang.reflect.Method handling
3151 //
3152 //
3153
3154 // Returns an array of "root" methods. These Method objects must NOT
3155 // be propagated to the outside world, but must instead be copied
3156 // via ReflectionFactory.copyMethod.
3157 private Method[] privateGetDeclaredMethods(boolean publicOnly) {
3158 Method[] res;
3159 ReflectionData<T> rd = reflectionData();
3160 if (rd != null) {
3161 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
3162 if (res != null) return res;
3163 }
3164 // No cached value available; request value from VM
3165 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
3166 if (rd != null) {
3167 if (publicOnly) {
3168 rd.declaredPublicMethods = res;
3169 } else {
3170 rd.declaredMethods = res;
3171 }
3172 }
3173 return res;
3174 }
3175
3176 // Returns an array of "root" methods. These Method objects must NOT
3177 // be propagated to the outside world, but must instead be copied
3178 // via ReflectionFactory.copyMethod.
3179 private Method[] privateGetPublicMethods() {
3180 Method[] res;
3181 ReflectionData<T> rd = reflectionData();
3182 if (rd != null) {
3183 res = rd.publicMethods;
3184 if (res != null) return res;
3185 }
3186
3187 // No cached value available; compute value recursively.
3188 // Start by fetching public declared methods...
3189 PublicMethods pms = new PublicMethods();
3190 for (Method m : privateGetDeclaredMethods(/* publicOnly */ true)) {
3191 pms.merge(m);
3192 }
3193 // ...then recur over superclass methods...
3194 Class<?> sc = getSuperclass();
3195 if (sc != null) {
3196 for (Method m : sc.privateGetPublicMethods()) {
3197 pms.merge(m);
3198 }
3199 }
3200 // ...and finally over direct superinterfaces.
3201 for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
3202 for (Method m : intf.privateGetPublicMethods()) {
3203 // static interface methods are not inherited
3204 if (!Modifier.isStatic(m.getModifiers())) {
3205 pms.merge(m);
3206 }
3207 }
3208 }
3209
3210 res = pms.toArray();
3211 if (rd != null) {
3212 rd.publicMethods = res;
3213 }
3214 return res;
3215 }
3216
3217
3218 //
3219 // Helpers for fetchers of one field, method, or constructor
3220 //
3221
3222 // This method does not copy the returned Field object!
3223 private static Field searchFields(Field[] fields, String name) {
3224 for (Field field : fields) {
3225 if (field.getName().equals(name)) {
3226 return field;
3227 }
3228 }
3229 return null;
3230 }
3231
3232 // Returns a "root" Field object. This Field object must NOT
3233 // be propagated to the outside world, but must instead be copied
3234 // via ReflectionFactory.copyField.
3235 private Field getField0(String name) {
3236 // Note: the intent is that the search algorithm this routine
3237 // uses be equivalent to the ordering imposed by
3238 // privateGetPublicFields(). It fetches only the declared
3239 // public fields for each class, however, to reduce the number
3240 // of Field objects which have to be created for the common
3241 // case where the field being requested is declared in the
3242 // class which is being queried.
3243 Field res;
3244 // Search declared public fields
3245 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
3246 return res;
3247 }
3248 // Direct superinterfaces, recursively
3249 Class<?>[] interfaces = getInterfaces(/* cloneArray */ false);
3250 for (Class<?> c : interfaces) {
3251 if ((res = c.getField0(name)) != null) {
3252 return res;
3253 }
3254 }
3255 // Direct superclass, recursively
3256 if (!isInterface()) {
3257 Class<?> c = getSuperclass();
3258 if (c != null) {
3259 if ((res = c.getField0(name)) != null) {
3260 return res;
3261 }
3262 }
3263 }
3264 return null;
3265 }
3266
3267 // This method does not copy the returned Method object!
3268 private static Method searchMethods(Method[] methods,
3269 String name,
3270 Class<?>[] parameterTypes)
3271 {
3272 ReflectionFactory fact = getReflectionFactory();
3273 Method res = null;
3274 for (Method m : methods) {
3275 if (m.getName().equals(name)
3276 && arrayContentsEq(parameterTypes,
3277 fact.getExecutableSharedParameterTypes(m))
3278 && (res == null
3279 || (res.getReturnType() != m.getReturnType()
3280 && res.getReturnType().isAssignableFrom(m.getReturnType()))))
3281 res = m;
3282 }
3283 return res;
3284 }
3285
3286 private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
3287
3288 // Returns a "root" Method object. This Method object must NOT
3289 // be propagated to the outside world, but must instead be copied
3290 // via ReflectionFactory.copyMethod.
3291 private Method getMethod0(String name, Class<?>[] parameterTypes) {
3292 PublicMethods.MethodList res = getMethodsRecursive(
3293 name,
3294 parameterTypes == null ? EMPTY_CLASS_ARRAY : parameterTypes,
3295 /* includeStatic */ true);
3296 return res == null ? null : res.getMostSpecific();
3297 }
3298
3299 // Returns a list of "root" Method objects. These Method objects must NOT
3300 // be propagated to the outside world, but must instead be copied
3301 // via ReflectionFactory.copyMethod.
3302 private PublicMethods.MethodList getMethodsRecursive(String name,
3303 Class<?>[] parameterTypes,
3304 boolean includeStatic) {
3305 // 1st check declared public methods
3306 Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
3307 PublicMethods.MethodList res = PublicMethods.MethodList
3308 .filter(methods, name, parameterTypes, includeStatic);
3309 // if there is at least one match among declared methods, we need not
3310 // search any further as such match surely overrides matching methods
3311 // declared in superclass(es) or interface(s).
3312 if (res != null) {
3313 return res;
3314 }
3315
3316 // if there was no match among declared methods,
3317 // we must consult the superclass (if any) recursively...
3318 Class<?> sc = getSuperclass();
3319 if (sc != null) {
3320 res = sc.getMethodsRecursive(name, parameterTypes, includeStatic);
3321 }
3322
3323 // ...and coalesce the superclass methods with methods obtained
3324 // from directly implemented interfaces excluding static methods...
3325 for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
3326 res = PublicMethods.MethodList.merge(
3327 res, intf.getMethodsRecursive(name, parameterTypes,
3328 /* includeStatic */ false));
3329 }
3330
3331 return res;
3332 }
3333
3334 // Returns a "root" Constructor object. This Constructor object must NOT
3335 // be propagated to the outside world, but must instead be copied
3336 // via ReflectionFactory.copyConstructor.
3337 private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
3338 int which) throws NoSuchMethodException
3339 {
3340 ReflectionFactory fact = getReflectionFactory();
3341 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
3342 for (Constructor<T> constructor : constructors) {
3343 if (arrayContentsEq(parameterTypes,
3344 fact.getExecutableSharedParameterTypes(constructor))) {
3345 return constructor;
3346 }
3347 }
3348 throw new NoSuchMethodException(methodToString("<init>", parameterTypes));
3349 }
3350
3351 //
3352 // Other helpers and base implementation
3353 //
3354
3355 private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
3356 if (a1 == null) {
3357 return a2 == null || a2.length == 0;
3358 }
3359
3360 if (a2 == null) {
3361 return a1.length == 0;
3362 }
3363
3364 if (a1.length != a2.length) {
3365 return false;
3366 }
3367
3368 for (int i = 0; i < a1.length; i++) {
3369 if (a1[i] != a2[i]) {
3370 return false;
3371 }
3372 }
3373
3374 return true;
3375 }
3376
3377 private static Field[] copyFields(Field[] arg) {
3378 Field[] out = new Field[arg.length];
3379 ReflectionFactory fact = getReflectionFactory();
3380 for (int i = 0; i < arg.length; i++) {
3381 out[i] = fact.copyField(arg[i]);
3382 }
3383 return out;
3384 }
3385
3386 private static Method[] copyMethods(Method[] arg) {
3387 Method[] out = new Method[arg.length];
3388 ReflectionFactory fact = getReflectionFactory();
3389 for (int i = 0; i < arg.length; i++) {
3390 out[i] = fact.copyMethod(arg[i]);
3391 }
3392 return out;
3393 }
3394
3395 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
3396 Constructor<U>[] out = arg.clone();
3397 ReflectionFactory fact = getReflectionFactory();
3398 for (int i = 0; i < out.length; i++) {
3399 out[i] = fact.copyConstructor(out[i]);
3400 }
3401 return out;
3402 }
3403
3404 private native Field[] getDeclaredFields0(boolean publicOnly);
3405 private native Method[] getDeclaredMethods0(boolean publicOnly);
3406 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
3407 private native Class<?>[] getDeclaredClasses0();
3408
3409 /**
3410 * Helper method to get the method name from arguments.
3411 */
3412 private String methodToString(String name, Class<?>[] argTypes) {
3413 StringJoiner sj = new StringJoiner(", ", getName() + "." + name + "(", ")");
3414 if (argTypes != null) {
3415 for (int i = 0; i < argTypes.length; i++) {
3416 Class<?> c = argTypes[i];
3417 sj.add((c == null) ? "null" : c.getName());
3418 }
3419 }
3420 return sj.toString();
3421 }
3422
3423 /** use serialVersionUID from JDK 1.1 for interoperability */
3424 private static final long serialVersionUID = 3206093459760846163L;
3425
3426
3427 /**
3428 * Class Class is special cased within the Serialization Stream Protocol.
3429 *
3430 * A Class instance is written initially into an ObjectOutputStream in the
3431 * following format:
3432 * <pre>
3433 * {@code TC_CLASS} ClassDescriptor
3434 * A ClassDescriptor is a special cased serialization of
3435 * a {@code java.io.ObjectStreamClass} instance.
3436 * </pre>
3437 * A new handle is generated for the initial time the class descriptor
3438 * is written into the stream. Future references to the class descriptor
3439 * are written as references to the initial class descriptor instance.
3440 *
3441 * @see java.io.ObjectStreamClass
3442 */
3443 private static final ObjectStreamField[] serialPersistentFields =
3444 new ObjectStreamField[0];
3445
3446
3447 /**
3448 * Returns the assertion status that would be assigned to this
3449 * class if it were to be initialized at the time this method is invoked.
3450 * If this class has had its assertion status set, the most recent
3451 * setting will be returned; otherwise, if any package default assertion
3452 * status pertains to this class, the most recent setting for the most
3453 * specific pertinent package default assertion status is returned;
3454 * otherwise, if this class is not a system class (i.e., it has a
3455 * class loader) its class loader's default assertion status is returned;
3456 * otherwise, the system class default assertion status is returned.
3457 * <p>
3458 * Few programmers will have any need for this method; it is provided
3459 * for the benefit of the JRE itself. (It allows a class to determine at
3460 * the time that it is initialized whether assertions should be enabled.)
3461 * Note that this method is not guaranteed to return the actual
3462 * assertion status that was (or will be) associated with the specified
3463 * class when it was (or will be) initialized.
3464 *
3465 * @return the desired assertion status of the specified class.
3466 * @see java.lang.ClassLoader#setClassAssertionStatus
3467 * @see java.lang.ClassLoader#setPackageAssertionStatus
3468 * @see java.lang.ClassLoader#setDefaultAssertionStatus
3469 * @since 1.4
3470 */
3471 public boolean desiredAssertionStatus() {
3472 ClassLoader loader = getClassLoader0();
3473 // If the loader is null this is a system class, so ask the VM
3474 if (loader == null)
3475 return desiredAssertionStatus0(this);
3476
3477 // If the classloader has been initialized with the assertion
3478 // directives, ask it. Otherwise, ask the VM.
3479 synchronized(loader.assertionLock) {
3480 if (loader.classAssertionStatus != null) {
3481 return loader.desiredAssertionStatus(getName());
3482 }
3483 }
3484 return desiredAssertionStatus0(this);
3485 }
3486
3487 // Retrieves the desired assertion status of this class from the VM
3488 private static native boolean desiredAssertionStatus0(Class<?> clazz);
3489
3490 /**
3491 * Returns true if and only if this class was declared as an enum in the
3492 * source code.
3493 *
3494 * @return true if and only if this class was declared as an enum in the
3495 * source code
3496 * @since 1.5
3497 */
3498 public boolean isEnum() {
3499 // An enum must both directly extend java.lang.Enum and have
3500 // the ENUM bit set; classes for specialized enum constants
3501 // don't do the former.
3502 return (this.getModifiers() & ENUM) != 0 &&
3503 this.getSuperclass() == java.lang.Enum.class;
3504 }
3505
3506 // Fetches the factory for reflective objects
3507 private static ReflectionFactory getReflectionFactory() {
3508 if (reflectionFactory == null) {
3509 reflectionFactory =
3510 java.security.AccessController.doPrivileged
3511 (new ReflectionFactory.GetReflectionFactoryAction());
3512 }
3513 return reflectionFactory;
3514 }
3515 private static ReflectionFactory reflectionFactory;
3516
3517 /**
3518 * Returns the elements of this enum class or null if this
3519 * Class object does not represent an enum type.
3520 *
3521 * @return an array containing the values comprising the enum class
3522 * represented by this Class object in the order they're
3523 * declared, or null if this Class object does not
3524 * represent an enum type
3525 * @since 1.5
3526 */
3527 public T[] getEnumConstants() {
3528 T[] values = getEnumConstantsShared();
3529 return (values != null) ? values.clone() : null;
3530 }
3531
3532 /**
3533 * Returns the elements of this enum class or null if this
3534 * Class object does not represent an enum type;
3535 * identical to getEnumConstants except that the result is
3536 * uncloned, cached, and shared by all callers.
3537 */
3538 T[] getEnumConstantsShared() {
3539 T[] constants = enumConstants;
3540 if (constants == null) {
3541 if (!isEnum()) return null;
3542 try {
3543 final Method values = getMethod("values");
3544 java.security.AccessController.doPrivileged(
3545 new java.security.PrivilegedAction<>() {
3546 public Void run() {
3547 values.setAccessible(true);
3548 return null;
3549 }
3550 });
3551 @SuppressWarnings("unchecked")
3552 T[] temporaryConstants = (T[])values.invoke(null);
3553 enumConstants = constants = temporaryConstants;
3554 }
3555 // These can happen when users concoct enum-like classes
3556 // that don't comply with the enum spec.
3557 catch (InvocationTargetException | NoSuchMethodException |
3558 IllegalAccessException ex) { return null; }
3559 }
3560 return constants;
3561 }
3562 private transient volatile T[] enumConstants;
3563
3564 /**
3565 * Returns a map from simple name to enum constant. This package-private
3566 * method is used internally by Enum to implement
3567 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
3568 * efficiently. Note that the map is returned by this method is
3569 * created lazily on first use. Typically it won't ever get created.
3570 */
3571 Map<String, T> enumConstantDirectory() {
3572 Map<String, T> directory = enumConstantDirectory;
3573 if (directory == null) {
3574 T[] universe = getEnumConstantsShared();
3575 if (universe == null)
3576 throw new IllegalArgumentException(
3577 getName() + " is not an enum type");
3578 directory = new HashMap<>((int)(universe.length / 0.75f) + 1);
3579 for (T constant : universe) {
3580 directory.put(((Enum<?>)constant).name(), constant);
3581 }
3582 enumConstantDirectory = directory;
3583 }
3584 return directory;
3585 }
3586 private transient volatile Map<String, T> enumConstantDirectory;
3587
3588 /**
3589 * Casts an object to the class or interface represented
3590 * by this {@code Class} object.
3591 *
3592 * @param obj the object to be cast
3593 * @return the object after casting, or null if obj is null
3594 *
3595 * @throws ClassCastException if the object is not
3596 * null and is not assignable to the type T.
3597 *
3598 * @since 1.5
3599 */
3600 @SuppressWarnings("unchecked")
3601 @HotSpotIntrinsicCandidate
3602 public T cast(Object obj) {
3603 if (obj != null && !isInstance(obj))
3604 throw new ClassCastException(cannotCastMsg(obj));
3605 return (T) obj;
3606 }
3607
3608 private String cannotCastMsg(Object obj) {
3609 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3610 }
3611
3612 /**
3613 * Casts this {@code Class} object to represent a subclass of the class
3614 * represented by the specified class object. Checks that the cast
3615 * is valid, and throws a {@code ClassCastException} if it is not. If
3616 * this method succeeds, it always returns a reference to this class object.
3617 *
3618 * <p>This method is useful when a client needs to "narrow" the type of
3619 * a {@code Class} object to pass it to an API that restricts the
3620 * {@code Class} objects that it is willing to accept. A cast would
3621 * generate a compile-time warning, as the correctness of the cast
3622 * could not be checked at runtime (because generic types are implemented
3623 * by erasure).
3624 *
3625 * @param <U> the type to cast this class object to
3626 * @param clazz the class of the type to cast this class object to
3627 * @return this {@code Class} object, cast to represent a subclass of
3628 * the specified class object.
3629 * @throws ClassCastException if this {@code Class} object does not
3630 * represent a subclass of the specified class (here "subclass" includes
3631 * the class itself).
3632 * @since 1.5
3633 */
3634 @SuppressWarnings("unchecked")
3635 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3636 if (clazz.isAssignableFrom(this))
3637 return (Class<? extends U>) this;
3638 else
3639 throw new ClassCastException(this.toString());
3640 }
3641
3642 /**
3643 * @throws NullPointerException {@inheritDoc}
3644 * @since 1.5
3645 */
3646 @SuppressWarnings("unchecked")
3647 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3648 Objects.requireNonNull(annotationClass);
3649
3650 return (A) annotationData().annotations.get(annotationClass);
3651 }
3652
3653 /**
3654 * {@inheritDoc}
3655 * @throws NullPointerException {@inheritDoc}
3656 * @since 1.5
3657 */
3658 @Override
3659 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3660 return GenericDeclaration.super.isAnnotationPresent(annotationClass);
3661 }
3662
3663 /**
3664 * @throws NullPointerException {@inheritDoc}
3665 * @since 1.8
3666 */
3667 @Override
3668 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
3669 Objects.requireNonNull(annotationClass);
3670
3671 AnnotationData annotationData = annotationData();
3672 return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
3673 this,
3674 annotationClass);
3675 }
3676
3677 /**
3678 * @since 1.5
3679 */
3680 public Annotation[] getAnnotations() {
3681 return AnnotationParser.toArray(annotationData().annotations);
3682 }
3683
3684 /**
3685 * @throws NullPointerException {@inheritDoc}
3686 * @since 1.8
3687 */
3688 @Override
3689 @SuppressWarnings("unchecked")
3690 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3691 Objects.requireNonNull(annotationClass);
3692
3693 return (A) annotationData().declaredAnnotations.get(annotationClass);
3694 }
3695
3696 /**
3697 * @throws NullPointerException {@inheritDoc}
3698 * @since 1.8
3699 */
3700 @Override
3701 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
3702 Objects.requireNonNull(annotationClass);
3703
3704 return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
3705 annotationClass);
3706 }
3707
3708 /**
3709 * @since 1.5
3710 */
3711 public Annotation[] getDeclaredAnnotations() {
3712 return AnnotationParser.toArray(annotationData().declaredAnnotations);
3713 }
3714
3715 // annotation data that might get invalidated when JVM TI RedefineClasses() is called
3716 private static class AnnotationData {
3717 final Map<Class<? extends Annotation>, Annotation> annotations;
3718 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3719
3720 // Value of classRedefinedCount when we created this AnnotationData instance
3721 final int redefinedCount;
3722
3723 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
3724 Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
3725 int redefinedCount) {
3726 this.annotations = annotations;
3727 this.declaredAnnotations = declaredAnnotations;
3728 this.redefinedCount = redefinedCount;
3729 }
3730 }
3731
3732 // Annotations cache
3733 @SuppressWarnings("UnusedDeclaration")
3734 private transient volatile AnnotationData annotationData;
3735
3736 private AnnotationData annotationData() {
3737 while (true) { // retry loop
3738 AnnotationData annotationData = this.annotationData;
3739 int classRedefinedCount = this.classRedefinedCount;
3740 if (annotationData != null &&
3741 annotationData.redefinedCount == classRedefinedCount) {
3742 return annotationData;
3743 }
3744 // null or stale annotationData -> optimistically create new instance
3745 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
3746 // try to install it
3747 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
3748 // successfully installed new AnnotationData
3749 return newAnnotationData;
3750 }
3751 }
3752 }
3753
3754 private AnnotationData createAnnotationData(int classRedefinedCount) {
3755 Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
3756 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
3757 Class<?> superClass = getSuperclass();
3758 Map<Class<? extends Annotation>, Annotation> annotations = null;
3759 if (superClass != null) {
3760 Map<Class<? extends Annotation>, Annotation> superAnnotations =
3761 superClass.annotationData().annotations;
3762 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
3763 Class<? extends Annotation> annotationClass = e.getKey();
3764 if (AnnotationType.getInstance(annotationClass).isInherited()) {
3765 if (annotations == null) { // lazy construction
3766 annotations = new LinkedHashMap<>((Math.max(
3767 declaredAnnotations.size(),
3768 Math.min(12, declaredAnnotations.size() + superAnnotations.size())
3769 ) * 4 + 2) / 3
3770 );
3771 }
3772 annotations.put(annotationClass, e.getValue());
3773 }
3774 }
3775 }
3776 if (annotations == null) {
3777 // no inherited annotations -> share the Map with declaredAnnotations
3778 annotations = declaredAnnotations;
3779 } else {
3780 // at least one inherited annotation -> declared may override inherited
3781 annotations.putAll(declaredAnnotations);
3782 }
3783 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
3784 }
3785
3786 // Annotation types cache their internal (AnnotationType) form
3787
3788 @SuppressWarnings("UnusedDeclaration")
3789 private transient volatile AnnotationType annotationType;
3790
3791 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
3792 return Atomic.casAnnotationType(this, oldType, newType);
3793 }
3794
3795 AnnotationType getAnnotationType() {
3796 return annotationType;
3797 }
3798
3799 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() {
3800 return annotationData().declaredAnnotations;
3801 }
3802
3803 /* Backing store of user-defined values pertaining to this class.
3804 * Maintained by the ClassValue class.
3805 */
3806 transient ClassValue.ClassValueMap classValueMap;
3807
3808 /**
3809 * Returns an {@code AnnotatedType} object that represents the use of a
3810 * type to specify the superclass of the entity represented by this {@code
3811 * Class} object. (The <em>use</em> of type Foo to specify the superclass
3812 * in '... extends Foo' is distinct from the <em>declaration</em> of type
3813 * Foo.)
3814 *
3815 * <p> If this {@code Class} object represents a type whose declaration
3816 * does not explicitly indicate an annotated superclass, then the return
3817 * value is an {@code AnnotatedType} object representing an element with no
3818 * annotations.
3819 *
3820 * <p> If this {@code Class} represents either the {@code Object} class, an
3821 * interface type, an array type, a primitive type, or void, the return
3822 * value is {@code null}.
3823 *
3824 * @return an object representing the superclass
3825 * @since 1.8
3826 */
3827 public AnnotatedType getAnnotatedSuperclass() {
3828 if (this == Object.class ||
3829 isInterface() ||
3830 isArray() ||
3831 isPrimitive() ||
3832 this == Void.TYPE) {
3833 return null;
3834 }
3835
3836 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
3837 }
3838
3839 /**
3840 * Returns an array of {@code AnnotatedType} objects that represent the use
3841 * of types to specify superinterfaces of the entity represented by this
3842 * {@code Class} object. (The <em>use</em> of type Foo to specify a
3843 * superinterface in '... implements Foo' is distinct from the
3844 * <em>declaration</em> of type Foo.)
3845 *
3846 * <p> If this {@code Class} object represents a class, the return value is
3847 * an array containing objects representing the uses of interface types to
3848 * specify interfaces implemented by the class. The order of the objects in
3849 * the array corresponds to the order of the interface types used in the
3850 * 'implements' clause of the declaration of this {@code Class} object.
3851 *
3852 * <p> If this {@code Class} object represents an interface, the return
3853 * value is an array containing objects representing the uses of interface
3854 * types to specify interfaces directly extended by the interface. The
3855 * order of the objects in the array corresponds to the order of the
3856 * interface types used in the 'extends' clause of the declaration of this
3857 * {@code Class} object.
3858 *
3859 * <p> If this {@code Class} object represents a class or interface whose
3860 * declaration does not explicitly indicate any annotated superinterfaces,
3861 * the return value is an array of length 0.
3862 *
3863 * <p> If this {@code Class} object represents either the {@code Object}
3864 * class, an array type, a primitive type, or void, the return value is an
3865 * array of length 0.
3866 *
3867 * @return an array representing the superinterfaces
3868 * @since 1.8
3869 */
3870 public AnnotatedType[] getAnnotatedInterfaces() {
3871 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
3872 }
3873
3874 private native Class<?> getNestHost0();
3875
3876 /**
3877 * Returns the nest host of the <a href=#nest>nest</a> to which the class
3878 * or interface represented by this {@code Class} object belongs.
3879 * Every class and interface is a member of exactly one nest.
3880 * A class or interface that is not recorded as belonging to a nest
3881 * belongs to the nest consisting only of itself, and is the nest
3882 * host.
3883 *
3884 * <p>Each of the {@code Class} objects representing array types,
3885 * primitive types, and {@code void} returns {@code this} to indicate
3886 * that the represented entity belongs to the nest consisting only of
3887 * itself, and is the nest host.
3888 *
3889 * <p>If there is a {@linkplain LinkageError linkage error} accessing
3890 * the nest host, or if this class or interface is not enumerated as
3891 * a member of the nest by the nest host, then it is considered to belong
3892 * to its own nest and {@code this} is returned as the host.
3893 *
3894 * @apiNote A {@code class} file of version 55.0 or greater may record the
3895 * host of the nest to which it belongs by using the {@code NestHost}
3896 * attribute (JVMS 4.7.28). Alternatively, a {@code class} file of
3897 * version 55.0 or greater may act as a nest host by enumerating the nest's
3898 * other members with the
3899 * {@code NestMembers} attribute (JVMS 4.7.29).
3900 * A {@code class} file of version 54.0 or lower does not use these
3901 * attributes.
3902 *
3903 * @return the nest host of this class or interface
3904 *
3905 * @throws SecurityException
3906 * If the returned class is not the current class, and
3907 * if a security manager, <i>s</i>, is present and the caller's
3908 * class loader is not the same as or an ancestor of the class
3909 * loader for the returned class and invocation of {@link
3910 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
3911 * denies access to the package of the returned class
3912 * @since 11
3913 * @jvms 4.7.28 and 4.7.29 NestHost and NestMembers attributes
3914 * @jvms 5.4.4 Access Control
3915 */
3916 @CallerSensitive
3917 public Class<?> getNestHost() {
3918 if (isPrimitive() || isArray()) {
3919 return this;
3920 }
3921 Class<?> host;
3922 try {
3923 host = getNestHost0();
3924 } catch (LinkageError e) {
3925 // if we couldn't load our nest-host then we
3926 // act as-if we have no nest-host attribute
3927 return this;
3928 }
3929 // if null then nest membership validation failed, so we
3930 // act as-if we have no nest-host attribute
3931 if (host == null || host == this) {
3932 return this;
3933 }
3934 // returning a different class requires a security check
3935 SecurityManager sm = System.getSecurityManager();
3936 if (sm != null) {
3937 checkPackageAccess(sm,
3938 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
3939 }
3940 return host;
3941 }
3942
3943 /**
3944 * Determines if the given {@code Class} is a nestmate of the
3945 * class or interface represented by this {@code Class} object.
3946 * Two classes or interfaces are nestmates
3947 * if they have the same {@linkplain #getNestHost() nest host}.
3948 *
3949 * @param c the class to check
3950 * @return {@code true} if this class and {@code c} are members of
3951 * the same nest; and {@code false} otherwise.
3952 *
3953 * @since 11
3954 */
3955 public boolean isNestmateOf(Class<?> c) {
3956 if (this == c) {
3957 return true;
3958 }
3959 if (isPrimitive() || isArray() ||
3960 c.isPrimitive() || c.isArray()) {
3961 return false;
3962 }
3963 try {
3964 return getNestHost0() == c.getNestHost0();
3965 } catch (LinkageError e) {
3966 return false;
3967 }
3968 }
3969
3970 private native Class<?>[] getNestMembers0();
3971
3972 /**
3973 * Returns an array containing {@code Class} objects representing all the
3974 * classes and interfaces that are members of the nest to which the class
3975 * or interface represented by this {@code Class} object belongs.
3976 * The {@linkplain #getNestHost() nest host} of that nest is the zeroth
3977 * element of the array. Subsequent elements represent any classes or
3978 * interfaces that are recorded by the nest host as being members of
3979 * the nest; the order of such elements is unspecified. Duplicates are
3980 * permitted.
3981 * If the nest host of that nest does not enumerate any members, then the
3982 * array has a single element containing {@code this}.
3983 *
3984 * <p>Each of the {@code Class} objects representing array types,
3985 * primitive types, and {@code void} returns an array containing only
3986 * {@code this}.
3987 *
3988 * <p>This method validates that, for each class or interface which is
3989 * recorded as a member of the nest by the nest host, that class or
3990 * interface records itself as a member of that same nest. Any exceptions
3991 * that occur during this validation are rethrown by this method.
3992 *
3993 * @return an array of all classes and interfaces in the same nest as
3994 * this class
3995 *
3996 * @throws LinkageError
3997 * If there is any problem loading or validating a nest member or
3998 * its nest host
3999 * @throws SecurityException
4000 * If any returned class is not the current class, and
4001 * if a security manager, <i>s</i>, is present and the caller's
4002 * class loader is not the same as or an ancestor of the class
4003 * loader for that returned class and invocation of {@link
4004 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
4005 * denies access to the package of that returned class
4006 *
4007 * @since 11
4008 * @see #getNestHost()
4009 */
4010 @CallerSensitive
4011 public Class<?>[] getNestMembers() {
4012 if (isPrimitive() || isArray()) {
4013 return new Class<?>[] { this };
4014 }
4015 Class<?>[] members = getNestMembers0();
4016 // Can't actually enable this due to bootstrapping issues
4017 // assert(members.length != 1 || members[0] == this); // expected invariant from VM
4018
4019 if (members.length > 1) {
4020 // If we return anything other than the current class we need
4021 // a security check
4022 SecurityManager sm = System.getSecurityManager();
4023 if (sm != null) {
4024 checkPackageAccess(sm,
4025 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
4026 }
4027 }
4028 return members;
4029 }
4030 }