2 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.
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
28 import java.io.ByteArrayInputStream;
29 import org.apidesign.bck2brwsr.emul.AnnotationImpl;
30 import java.io.InputStream;
31 import java.lang.annotation.Annotation;
32 import java.lang.reflect.Field;
33 import java.lang.reflect.Method;
34 import java.lang.reflect.TypeVariable;
35 import org.apidesign.bck2brwsr.core.JavaScriptBody;
36 import org.apidesign.bck2brwsr.emul.MethodImpl;
39 * Instances of the class {@code Class} represent classes and
40 * interfaces in a running Java application. An enum is a kind of
41 * class and an annotation is a kind of interface. Every array also
42 * belongs to a class that is reflected as a {@code Class} object
43 * that is shared by all arrays with the same element type and number
44 * of dimensions. The primitive Java types ({@code boolean},
45 * {@code byte}, {@code char}, {@code short},
46 * {@code int}, {@code long}, {@code float}, and
47 * {@code double}), and the keyword {@code void} are also
48 * represented as {@code Class} objects.
50 * <p> {@code Class} has no public constructor. Instead {@code Class}
51 * objects are constructed automatically by the Java Virtual Machine as classes
52 * are loaded and by calls to the {@code defineClass} method in the class
55 * <p> The following example uses a {@code Class} object to print the
56 * class name of an object:
58 * <p> <blockquote><pre>
59 * void printClassName(Object obj) {
60 * System.out.println("The class of " + obj +
61 * " is " + obj.getClass().getName());
65 * <p> It is also possible to get the {@code Class} object for a named
66 * type (or for void) using a class literal. See Section 15.8.2 of
67 * <cite>The Java™ Language Specification</cite>.
71 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
74 * @param <T> the type of the class modeled by this {@code Class}
75 * object. For example, the type of {@code String.class} is {@code
76 * Class<String>}. Use {@code Class<?>} if the class being modeled is
80 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
84 class Class<T> implements java.io.Serializable,
85 java.lang.reflect.GenericDeclaration,
86 java.lang.reflect.Type,
87 java.lang.reflect.AnnotatedElement {
88 private static final int ANNOTATION= 0x00002000;
89 private static final int ENUM = 0x00004000;
90 private static final int SYNTHETIC = 0x00001000;
93 * Constructor. Only the Java Virtual Machine creates Class
100 * Converts the object to a string. The string representation is the
101 * string "class" or "interface", followed by a space, and then by the
102 * fully qualified name of the class in the format returned by
103 * {@code getName}. If this {@code Class} object represents a
104 * primitive type, this method returns the name of the primitive type. If
105 * this {@code Class} object represents void this method returns
108 * @return a string representation of this class object.
110 public String toString() {
111 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
117 * Returns the {@code Class} object associated with the class or
118 * interface with the given string name. Invoking this method is
122 * {@code Class.forName(className, true, currentLoader)}
125 * where {@code currentLoader} denotes the defining class loader of
128 * <p> For example, the following code fragment returns the
129 * runtime {@code Class} descriptor for the class named
130 * {@code java.lang.Thread}:
133 * {@code Class t = Class.forName("java.lang.Thread")}
136 * A call to {@code forName("X")} causes the class named
137 * {@code X} to be initialized.
139 * @param className the fully qualified name of the desired class.
140 * @return the {@code Class} object for the class with the
142 * @exception LinkageError if the linkage fails
143 * @exception ExceptionInInitializerError if the initialization provoked
144 * by this method fails
145 * @exception ClassNotFoundException if the class cannot be located
147 public static Class<?> forName(String className)
148 throws ClassNotFoundException {
149 Class<?> c = loadCls(className, className.replace('.', '_'));
151 throw new ClassNotFoundException(className);
156 @JavaScriptBody(args = {"n", "c" }, body =
157 "if (vm[c]) return vm[c].$class;\n"
158 + "if (vm.loadClass) {\n"
159 + " vm.loadClass(n);\n"
160 + " if (vm[c]) return vm[c].$class;\n"
164 private static native Class<?> loadCls(String n, String c);
168 * Creates a new instance of the class represented by this {@code Class}
169 * object. The class is instantiated as if by a {@code new}
170 * expression with an empty argument list. The class is initialized if it
171 * has not already been initialized.
173 * <p>Note that this method propagates any exception thrown by the
174 * nullary constructor, including a checked exception. Use of
175 * this method effectively bypasses the compile-time exception
176 * checking that would otherwise be performed by the compiler.
178 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
179 * Constructor.newInstance} method avoids this problem by wrapping
180 * any exception thrown by the constructor in a (checked) {@link
181 * java.lang.reflect.InvocationTargetException}.
183 * @return a newly allocated instance of the class represented by this
185 * @exception IllegalAccessException if the class or its nullary
186 * constructor is not accessible.
187 * @exception InstantiationException
188 * if this {@code Class} represents an abstract class,
189 * an interface, an array class, a primitive type, or void;
190 * or if the class has no nullary constructor;
191 * or if the instantiation fails for some other reason.
192 * @exception ExceptionInInitializerError if the initialization
193 * provoked by this method fails.
194 * @exception SecurityException
195 * If a security manager, <i>s</i>, is present and any of the
196 * following conditions is met:
201 * {@link SecurityManager#checkMemberAccess
202 * s.checkMemberAccess(this, Member.PUBLIC)} denies
203 * creation of new instances of this class
205 * <li> the caller's class loader is not the same as or an
206 * ancestor of the class loader for the current class and
207 * invocation of {@link SecurityManager#checkPackageAccess
208 * s.checkPackageAccess()} denies access to the package
214 @JavaScriptBody(args = { "self", "illegal" }, body =
215 "\nvar c = self.cnstr;"
216 + "\nif (c['cons__V']) {"
217 + "\n if ((c.cons__V.access & 0x1) != 0) {"
218 + "\n var inst = c();"
219 + "\n c.cons__V(inst);"
222 + "\n return illegal;"
226 private static native Object newInstance0(Class<?> self, Object illegal);
228 public T newInstance()
229 throws InstantiationException, IllegalAccessException
231 Object illegal = new Object();
232 Object inst = newInstance0(this, illegal);
234 throw new InstantiationException(getName());
236 if (inst == illegal) {
237 throw new IllegalAccessException();
243 * Determines if the specified {@code Object} is assignment-compatible
244 * with the object represented by this {@code Class}. This method is
245 * the dynamic equivalent of the Java language {@code instanceof}
246 * operator. The method returns {@code true} if the specified
247 * {@code Object} argument is non-null and can be cast to the
248 * reference type represented by this {@code Class} object without
249 * raising a {@code ClassCastException.} It returns {@code false}
252 * <p> Specifically, if this {@code Class} object represents a
253 * declared class, this method returns {@code true} if the specified
254 * {@code Object} argument is an instance of the represented class (or
255 * of any of its subclasses); it returns {@code false} otherwise. If
256 * this {@code Class} object represents an array class, this method
257 * returns {@code true} if the specified {@code Object} argument
258 * can be converted to an object of the array class by an identity
259 * conversion or by a widening reference conversion; it returns
260 * {@code false} otherwise. If this {@code Class} object
261 * represents an interface, this method returns {@code true} if the
262 * class or any superclass of the specified {@code Object} argument
263 * implements this interface; it returns {@code false} otherwise. If
264 * this {@code Class} object represents a primitive type, this method
265 * returns {@code false}.
267 * @param obj the object to check
268 * @return true if {@code obj} is an instance of this class
272 public native boolean isInstance(Object obj);
276 * Determines if the class or interface represented by this
277 * {@code Class} object is either the same as, or is a superclass or
278 * superinterface of, the class or interface represented by the specified
279 * {@code Class} parameter. It returns {@code true} if so;
280 * otherwise it returns {@code false}. If this {@code Class}
281 * object represents a primitive type, this method returns
282 * {@code true} if the specified {@code Class} parameter is
283 * exactly this {@code Class} object; otherwise it returns
286 * <p> Specifically, this method tests whether the type represented by the
287 * specified {@code Class} parameter can be converted to the type
288 * represented by this {@code Class} object via an identity conversion
289 * or via a widening reference conversion. See <em>The Java Language
290 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
292 * @param cls the {@code Class} object to be checked
293 * @return the {@code boolean} value indicating whether objects of the
294 * type {@code cls} can be assigned to objects of this class
295 * @exception NullPointerException if the specified Class parameter is
299 public native boolean isAssignableFrom(Class<?> cls);
303 * Determines if the specified {@code Class} object represents an
306 * @return {@code true} if this object represents an interface;
307 * {@code false} otherwise.
309 public boolean isInterface() {
310 return (getAccess() & 0x200) != 0;
313 @JavaScriptBody(args = "self", body = "return self.access;")
314 private native int getAccess();
318 * Determines if this {@code Class} object represents an array class.
320 * @return {@code true} if this object represents an array class;
321 * {@code false} otherwise.
324 public boolean isArray() {
330 * Determines if the specified {@code Class} object represents a
333 * <p> There are nine predefined {@code Class} objects to represent
334 * the eight primitive types and void. These are created by the Java
335 * Virtual Machine, and have the same names as the primitive types that
336 * they represent, namely {@code boolean}, {@code byte},
337 * {@code char}, {@code short}, {@code int},
338 * {@code long}, {@code float}, and {@code double}.
340 * <p> These objects may only be accessed via the following public static
341 * final variables, and are the only {@code Class} objects for which
342 * this method returns {@code true}.
344 * @return true if and only if this class represents a primitive type
346 * @see java.lang.Boolean#TYPE
347 * @see java.lang.Character#TYPE
348 * @see java.lang.Byte#TYPE
349 * @see java.lang.Short#TYPE
350 * @see java.lang.Integer#TYPE
351 * @see java.lang.Long#TYPE
352 * @see java.lang.Float#TYPE
353 * @see java.lang.Double#TYPE
354 * @see java.lang.Void#TYPE
357 @JavaScriptBody(args = "self", body =
358 "if (self.primitive) return true;"
359 + "else return false;"
361 public native boolean isPrimitive();
364 * Returns true if this {@code Class} object represents an annotation
365 * type. Note that if this method returns true, {@link #isInterface()}
366 * would also return true, as all annotation types are also interfaces.
368 * @return {@code true} if this class object represents an annotation
369 * type; {@code false} otherwise
372 public boolean isAnnotation() {
373 return (getModifiers() & ANNOTATION) != 0;
377 * Returns {@code true} if this class is a synthetic class;
378 * returns {@code false} otherwise.
379 * @return {@code true} if and only if this class is a synthetic class as
380 * defined by the Java Language Specification.
383 public boolean isSynthetic() {
384 return (getModifiers() & SYNTHETIC) != 0;
388 * Returns the name of the entity (class, interface, array class,
389 * primitive type, or void) represented by this {@code Class} object,
390 * as a {@code String}.
392 * <p> If this class object represents a reference type that is not an
393 * array type then the binary name of the class is returned, as specified
395 * <cite>The Java™ Language Specification</cite>.
397 * <p> If this class object represents a primitive type or void, then the
398 * name returned is a {@code String} equal to the Java language
399 * keyword corresponding to the primitive type or void.
401 * <p> If this class object represents a class of arrays, then the internal
402 * form of the name consists of the name of the element type preceded by
403 * one or more '{@code [}' characters representing the depth of the array
404 * nesting. The encoding of element type names is as follows:
406 * <blockquote><table summary="Element types and encodings">
407 * <tr><th> Element Type <th> <th> Encoding
408 * <tr><td> boolean <td> <td align=center> Z
409 * <tr><td> byte <td> <td align=center> B
410 * <tr><td> char <td> <td align=center> C
411 * <tr><td> class or interface
412 * <td> <td align=center> L<i>classname</i>;
413 * <tr><td> double <td> <td align=center> D
414 * <tr><td> float <td> <td align=center> F
415 * <tr><td> int <td> <td align=center> I
416 * <tr><td> long <td> <td align=center> J
417 * <tr><td> short <td> <td align=center> S
418 * </table></blockquote>
420 * <p> The class or interface name <i>classname</i> is the binary name of
421 * the class specified above.
425 * String.class.getName()
426 * returns "java.lang.String"
427 * byte.class.getName()
429 * (new Object[3]).getClass().getName()
430 * returns "[Ljava.lang.Object;"
431 * (new int[3][4][5][6][7][8][9]).getClass().getName()
433 * </pre></blockquote>
435 * @return the name of the class or interface
436 * represented by this object.
438 public String getName() {
439 return jvmName().replace('/', '.');
442 @JavaScriptBody(args = "self", body = "return self.jvmName;")
443 private native String jvmName();
447 * Returns an array of {@code TypeVariable} objects that represent the
448 * type variables declared by the generic declaration represented by this
449 * {@code GenericDeclaration} object, in declaration order. Returns an
450 * array of length 0 if the underlying generic declaration declares no type
453 * @return an array of {@code TypeVariable} objects that represent
454 * the type variables declared by this generic declaration
455 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
456 * signature of this generic declaration does not conform to
457 * the format specified in
458 * <cite>The Java™ Virtual Machine Specification</cite>
461 public TypeVariable<Class<T>>[] getTypeParameters() {
462 throw new UnsupportedOperationException();
466 * Returns the {@code Class} representing the superclass of the entity
467 * (class, interface, primitive type or void) represented by this
468 * {@code Class}. If this {@code Class} represents either the
469 * {@code Object} class, an interface, a primitive type, or void, then
470 * null is returned. If this object represents an array class then the
471 * {@code Class} object representing the {@code Object} class is
474 * @return the superclass of the class represented by this object.
476 @JavaScriptBody(args = "self", body = "return self.superclass;")
477 public native Class<? super T> getSuperclass();
480 * Returns the Java language modifiers for this class or interface, encoded
481 * in an integer. The modifiers consist of the Java Virtual Machine's
482 * constants for {@code public}, {@code protected},
483 * {@code private}, {@code final}, {@code static},
484 * {@code abstract} and {@code interface}; they should be decoded
485 * using the methods of class {@code Modifier}.
487 * <p> If the underlying class is an array class, then its
488 * {@code public}, {@code private} and {@code protected}
489 * modifiers are the same as those of its component type. If this
490 * {@code Class} represents a primitive type or void, its
491 * {@code public} modifier is always {@code true}, and its
492 * {@code protected} and {@code private} modifiers are always
493 * {@code false}. If this object represents an array class, a
494 * primitive type or void, then its {@code final} modifier is always
495 * {@code true} and its interface modifier is always
496 * {@code false}. The values of its other modifiers are not determined
497 * by this specification.
499 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
500 * Specification</em>, table 4.1.
502 * @return the {@code int} representing the modifiers for this class
503 * @see java.lang.reflect.Modifier
506 public native int getModifiers();
510 * Returns the simple name of the underlying class as given in the
511 * source code. Returns an empty string if the underlying class is
514 * <p>The simple name of an array is the simple name of the
515 * component type with "[]" appended. In particular the simple
516 * name of an array whose component type is anonymous is "[]".
518 * @return the simple name of the underlying class
521 public String getSimpleName() {
523 return getComponentType().getSimpleName()+"[]";
525 String simpleName = getSimpleBinaryName();
526 if (simpleName == null) { // top level class
527 simpleName = getName();
528 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
530 // According to JLS3 "Binary Compatibility" (13.1) the binary
531 // name of non-package classes (not top level) is the binary
532 // name of the immediately enclosing class followed by a '$' followed by:
533 // (for nested and inner classes): the simple name.
534 // (for local classes): 1 or more digits followed by the simple name.
535 // (for anonymous classes): 1 or more digits.
537 // Since getSimpleBinaryName() will strip the binary name of
538 // the immediatly enclosing class, we are now looking at a
539 // string that matches the regular expression "\$[0-9]*"
540 // followed by a simple name (considering the simple of an
541 // anonymous class to be the empty string).
543 // Remove leading "\$[0-9]*" from the name
544 int length = simpleName.length();
545 if (length < 1 || simpleName.charAt(0) != '$')
546 throw new IllegalStateException("Malformed class name");
548 while (index < length && isAsciiDigit(simpleName.charAt(index)))
550 // Eventually, this is the empty string iff this is an anonymous class
551 return simpleName.substring(index);
555 * Returns the "simple binary name" of the underlying class, i.e.,
556 * the binary name without the leading enclosing class name.
557 * Returns {@code null} if the underlying class is a top level
560 private String getSimpleBinaryName() {
561 Class<?> enclosingClass = null; // XXX getEnclosingClass();
562 if (enclosingClass == null) // top level class
564 // Otherwise, strip the enclosing class' name
566 return getName().substring(enclosingClass.getName().length());
567 } catch (IndexOutOfBoundsException ex) {
568 throw new IllegalStateException("Malformed class name");
573 * Returns an array containing {@code Field} objects reflecting all
574 * the accessible public fields of the class or interface represented by
575 * this {@code Class} object. The elements in the array returned are
576 * not sorted and are not in any particular order. This method returns an
577 * array of length 0 if the class or interface has no accessible public
578 * fields, or if it represents an array class, a primitive type, or void.
580 * <p> Specifically, if this {@code Class} object represents a class,
581 * this method returns the public fields of this class and of all its
582 * superclasses. If this {@code Class} object represents an
583 * interface, this method returns the fields of this interface and of all
584 * its superinterfaces.
586 * <p> The implicit length field for array class is not reflected by this
587 * method. User code should use the methods of class {@code Array} to
590 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
592 * @return the array of {@code Field} objects representing the
594 * @exception SecurityException
595 * If a security manager, <i>s</i>, is present and any of the
596 * following conditions is met:
601 * {@link SecurityManager#checkMemberAccess
602 * s.checkMemberAccess(this, Member.PUBLIC)} denies
603 * access to the fields within this class
605 * <li> the caller's class loader is not the same as or an
606 * ancestor of the class loader for the current class and
607 * invocation of {@link SecurityManager#checkPackageAccess
608 * s.checkPackageAccess()} denies access to the package
615 public Field[] getFields() throws SecurityException {
616 throw new SecurityException();
620 * Returns an array containing {@code Method} objects reflecting all
621 * the public <em>member</em> methods of the class or interface represented
622 * by this {@code Class} object, including those declared by the class
623 * or interface and those inherited from superclasses and
624 * superinterfaces. Array classes return all the (public) member methods
625 * inherited from the {@code Object} class. The elements in the array
626 * returned are not sorted and are not in any particular order. This
627 * method returns an array of length 0 if this {@code Class} object
628 * represents a class or interface that has no public member methods, or if
629 * this {@code Class} object represents a primitive type or void.
631 * <p> The class initialization method {@code <clinit>} is not
632 * included in the returned array. If the class declares multiple public
633 * member methods with the same parameter types, they are all included in
634 * the returned array.
636 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
638 * @return the array of {@code Method} objects representing the
639 * public methods of this class
640 * @exception SecurityException
641 * If a security manager, <i>s</i>, is present and any of the
642 * following conditions is met:
647 * {@link SecurityManager#checkMemberAccess
648 * s.checkMemberAccess(this, Member.PUBLIC)} denies
649 * access to the methods within this class
651 * <li> the caller's class loader is not the same as or an
652 * ancestor of the class loader for the current class and
653 * invocation of {@link SecurityManager#checkPackageAccess
654 * s.checkPackageAccess()} denies access to the package
661 public Method[] getMethods() throws SecurityException {
662 return MethodImpl.findMethods(this, 0x01);
666 * Returns a {@code Field} object that reflects the specified public
667 * member field of the class or interface represented by this
668 * {@code Class} object. The {@code name} parameter is a
669 * {@code String} specifying the simple name of the desired field.
671 * <p> The field to be reflected is determined by the algorithm that
672 * follows. Let C be the class represented by this object:
674 * <LI> If C declares a public field with the name specified, that is the
675 * field to be reflected.</LI>
676 * <LI> If no field was found in step 1 above, this algorithm is applied
677 * recursively to each direct superinterface of C. The direct
678 * superinterfaces are searched in the order they were declared.</LI>
679 * <LI> If no field was found in steps 1 and 2 above, and C has a
680 * superclass S, then this algorithm is invoked recursively upon S.
681 * If C has no superclass, then a {@code NoSuchFieldException}
685 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
687 * @param name the field name
688 * @return the {@code Field} object of this class specified by
690 * @exception NoSuchFieldException if a field with the specified name is
692 * @exception NullPointerException if {@code name} is {@code null}
693 * @exception SecurityException
694 * If a security manager, <i>s</i>, is present and any of the
695 * following conditions is met:
700 * {@link SecurityManager#checkMemberAccess
701 * s.checkMemberAccess(this, Member.PUBLIC)} denies
702 * access to the field
704 * <li> the caller's class loader is not the same as or an
705 * ancestor of the class loader for the current class and
706 * invocation of {@link SecurityManager#checkPackageAccess
707 * s.checkPackageAccess()} denies access to the package
714 public Field getField(String name)
715 throws SecurityException {
716 throw new SecurityException();
721 * Returns a {@code Method} object that reflects the specified public
722 * member method of the class or interface represented by this
723 * {@code Class} object. The {@code name} parameter is a
724 * {@code String} specifying the simple name of the desired method. The
725 * {@code parameterTypes} parameter is an array of {@code Class}
726 * objects that identify the method's formal parameter types, in declared
727 * order. If {@code parameterTypes} is {@code null}, it is
728 * treated as if it were an empty array.
730 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
731 * {@code NoSuchMethodException} is raised. Otherwise, the method to
732 * be reflected is determined by the algorithm that follows. Let C be the
733 * class represented by this object:
735 * <LI> C is searched for any <I>matching methods</I>. If no matching
736 * method is found, the algorithm of step 1 is invoked recursively on
737 * the superclass of C.</LI>
738 * <LI> If no method was found in step 1 above, the superinterfaces of C
739 * are searched for a matching method. If any such method is found, it
743 * To find a matching method in a class C: If C declares exactly one
744 * public method with the specified name and exactly the same formal
745 * parameter types, that is the method reflected. If more than one such
746 * method is found in C, and one of these methods has a return type that is
747 * more specific than any of the others, that method is reflected;
748 * otherwise one of the methods is chosen arbitrarily.
750 * <p>Note that there may be more than one matching method in a
751 * class because while the Java language forbids a class to
752 * declare multiple methods with the same signature but different
753 * return types, the Java virtual machine does not. This
754 * increased flexibility in the virtual machine can be used to
755 * implement various language features. For example, covariant
756 * returns can be implemented with {@linkplain
757 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
758 * method and the method being overridden would have the same
759 * signature but different return types.
761 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
763 * @param name the name of the method
764 * @param parameterTypes the list of parameters
765 * @return the {@code Method} object that matches the specified
766 * {@code name} and {@code parameterTypes}
767 * @exception NoSuchMethodException if a matching method is not found
768 * or if the name is "<init>"or "<clinit>".
769 * @exception NullPointerException if {@code name} is {@code null}
770 * @exception SecurityException
771 * If a security manager, <i>s</i>, is present and any of the
772 * following conditions is met:
777 * {@link SecurityManager#checkMemberAccess
778 * s.checkMemberAccess(this, Member.PUBLIC)} denies
779 * access to the method
781 * <li> the caller's class loader is not the same as or an
782 * ancestor of the class loader for the current class and
783 * invocation of {@link SecurityManager#checkPackageAccess
784 * s.checkPackageAccess()} denies access to the package
791 public Method getMethod(String name, Class<?>... parameterTypes)
792 throws SecurityException, NoSuchMethodException {
793 Method m = MethodImpl.findMethod(this, name, parameterTypes);
795 StringBuilder sb = new StringBuilder();
796 sb.append(getName()).append('.').append(name).append('(');
798 for (int i = 0; i < parameterTypes.length; i++) {
799 sb.append(sep).append(parameterTypes[i].getName());
803 throw new NoSuchMethodException(sb.toString());
809 * Character.isDigit answers {@code true} to some non-ascii
810 * digits. This one does not.
812 private static boolean isAsciiDigit(char c) {
813 return '0' <= c && c <= '9';
817 * Returns the canonical name of the underlying class as
818 * defined by the Java Language Specification. Returns null if
819 * the underlying class does not have a canonical name (i.e., if
820 * it is a local or anonymous class or an array whose component
821 * type does not have a canonical name).
822 * @return the canonical name of the underlying class if it exists, and
823 * {@code null} otherwise.
826 public String getCanonicalName() {
828 String canonicalName = getComponentType().getCanonicalName();
829 if (canonicalName != null)
830 return canonicalName + "[]";
834 // if (isLocalOrAnonymousClass())
836 // Class<?> enclosingClass = getEnclosingClass();
837 Class<?> enclosingClass = null;
838 if (enclosingClass == null) { // top level class
841 String enclosingName = enclosingClass.getCanonicalName();
842 if (enclosingName == null)
844 return enclosingName + "." + getSimpleName();
849 * Finds a resource with a given name. The rules for searching resources
850 * associated with a given class are implemented by the defining
851 * {@linkplain ClassLoader class loader} of the class. This method
852 * delegates to this object's class loader. If this object was loaded by
853 * the bootstrap class loader, the method delegates to {@link
854 * ClassLoader#getSystemResourceAsStream}.
856 * <p> Before delegation, an absolute resource name is constructed from the
857 * given resource name using this algorithm:
861 * <li> If the {@code name} begins with a {@code '/'}
862 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
863 * portion of the {@code name} following the {@code '/'}.
865 * <li> Otherwise, the absolute name is of the following form:
868 * {@code modified_package_name/name}
871 * <p> Where the {@code modified_package_name} is the package name of this
872 * object with {@code '/'} substituted for {@code '.'}
873 * (<tt>'\u002e'</tt>).
877 * @param name name of the desired resource
878 * @return A {@link java.io.InputStream} object or {@code null} if
879 * no resource with this name is found
880 * @throws NullPointerException If {@code name} is {@code null}
883 public InputStream getResourceAsStream(String name) {
884 name = resolveName(name);
885 byte[] arr = getResourceAsStream0(name);
886 return arr == null ? null : new ByteArrayInputStream(arr);
889 @JavaScriptBody(args = "name", body =
890 "return (vm.loadBytes) ? vm.loadBytes(name) : null;"
892 private static native byte[] getResourceAsStream0(String name);
895 * Finds a resource with a given name. The rules for searching resources
896 * associated with a given class are implemented by the defining
897 * {@linkplain ClassLoader class loader} of the class. This method
898 * delegates to this object's class loader. If this object was loaded by
899 * the bootstrap class loader, the method delegates to {@link
900 * ClassLoader#getSystemResource}.
902 * <p> Before delegation, an absolute resource name is constructed from the
903 * given resource name using this algorithm:
907 * <li> If the {@code name} begins with a {@code '/'}
908 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
909 * portion of the {@code name} following the {@code '/'}.
911 * <li> Otherwise, the absolute name is of the following form:
914 * {@code modified_package_name/name}
917 * <p> Where the {@code modified_package_name} is the package name of this
918 * object with {@code '/'} substituted for {@code '.'}
919 * (<tt>'\u002e'</tt>).
923 * @param name name of the desired resource
924 * @return A {@link java.net.URL} object or {@code null} if no
925 * resource with this name is found
928 public java.net.URL getResource(String name) {
929 name = resolveName(name);
930 ClassLoader cl = null;
933 return ClassLoader.getSystemResource(name);
935 return cl.getResource(name);
940 * Add a package name prefix if the name is not absolute Remove leading "/"
941 * if name is absolute
943 private String resolveName(String name) {
947 if (!name.startsWith("/")) {
949 while (c.isArray()) {
950 c = c.getComponentType();
952 String baseName = c.getName();
953 int index = baseName.lastIndexOf('.');
955 name = baseName.substring(0, index).replace('.', '/')
959 name = name.substring(1);
965 * Returns the class loader for the class. Some implementations may use
966 * null to represent the bootstrap class loader. This method will return
967 * null in such implementations if this class was loaded by the bootstrap
970 * <p> If a security manager is present, and the caller's class loader is
971 * not null and the caller's class loader is not the same as or an ancestor of
972 * the class loader for the class whose class loader is requested, then
973 * this method calls the security manager's {@code checkPermission}
974 * method with a {@code RuntimePermission("getClassLoader")}
975 * permission to ensure it's ok to access the class loader for the class.
978 * represents a primitive type or void, null is returned.
980 * @return the class loader that loaded the class or interface
981 * represented by this object.
982 * @throws SecurityException
983 * if a security manager exists and its
984 * {@code checkPermission} method denies
985 * access to the class loader for the class.
986 * @see java.lang.ClassLoader
987 * @see SecurityManager#checkPermission
988 * @see java.lang.RuntimePermission
990 public ClassLoader getClassLoader() {
991 throw new SecurityException();
995 * Returns the {@code Class} representing the component type of an
996 * array. If this class does not represent an array class this method
999 * @return the {@code Class} representing the component type of this
1000 * class if this class is an array
1001 * @see java.lang.reflect.Array
1004 public Class<?> getComponentType() {
1009 * Returns true if and only if this class was declared as an enum in the
1012 * @return true if and only if this class was declared as an enum in the
1016 public boolean isEnum() {
1017 // An enum must both directly extend java.lang.Enum and have
1018 // the ENUM bit set; classes for specialized enum constants
1019 // don't do the former.
1020 return (this.getModifiers() & ENUM) != 0 &&
1021 this.getSuperclass() == java.lang.Enum.class;
1025 * Casts an object to the class or interface represented
1026 * by this {@code Class} object.
1028 * @param obj the object to be cast
1029 * @return the object after casting, or null if obj is null
1031 * @throws ClassCastException if the object is not
1032 * null and is not assignable to the type T.
1036 public T cast(Object obj) {
1037 if (obj != null && !isInstance(obj))
1038 throw new ClassCastException(cannotCastMsg(obj));
1042 private String cannotCastMsg(Object obj) {
1043 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
1047 * Casts this {@code Class} object to represent a subclass of the class
1048 * represented by the specified class object. Checks that that the cast
1049 * is valid, and throws a {@code ClassCastException} if it is not. If
1050 * this method succeeds, it always returns a reference to this class object.
1052 * <p>This method is useful when a client needs to "narrow" the type of
1053 * a {@code Class} object to pass it to an API that restricts the
1054 * {@code Class} objects that it is willing to accept. A cast would
1055 * generate a compile-time warning, as the correctness of the cast
1056 * could not be checked at runtime (because generic types are implemented
1059 * @return this {@code Class} object, cast to represent a subclass of
1060 * the specified class object.
1061 * @throws ClassCastException if this {@code Class} object does not
1062 * represent a subclass of the specified class (here "subclass" includes
1063 * the class itself).
1066 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
1067 if (clazz.isAssignableFrom(this))
1068 return (Class<? extends U>) this;
1070 throw new ClassCastException(this.toString());
1073 @JavaScriptBody(args = { "self", "ac" },
1076 + " return self.anno['L' + ac.jvmName + ';'];"
1077 + "} else return null;"
1079 private Object getAnnotationData(Class<?> annotationClass) {
1080 throw new UnsupportedOperationException();
1083 * @throws NullPointerException {@inheritDoc}
1086 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
1087 Object data = getAnnotationData(annotationClass);
1088 return data == null ? null : AnnotationImpl.create(annotationClass, data);
1092 * @throws NullPointerException {@inheritDoc}
1095 @JavaScriptBody(args = { "self", "ac" },
1096 body = "if (self.anno && self.anno['L' + ac.jvmName + ';']) { return true; }"
1097 + "else return false;"
1099 public boolean isAnnotationPresent(
1100 Class<? extends Annotation> annotationClass) {
1101 if (annotationClass == null)
1102 throw new NullPointerException();
1104 return getAnnotation(annotationClass) != null;
1107 @JavaScriptBody(args = "self", body = "return self.anno;")
1108 private Object getAnnotationData() {
1109 throw new UnsupportedOperationException();
1115 public Annotation[] getAnnotations() {
1116 Object data = getAnnotationData();
1117 return data == null ? new Annotation[0] : AnnotationImpl.create(data);
1123 public Annotation[] getDeclaredAnnotations() {
1124 throw new UnsupportedOperationException();
1127 @JavaScriptBody(args = "type", body = ""
1128 + "var c = vm.java_lang_Class(true);"
1129 + "c.jvmName = type;"
1130 + "c.primitive = true;"
1133 native static Class getPrimitiveClass(String type);
1135 public boolean desiredAssertionStatus() {