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