| /* |
| * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.lang; |
| |
| import java.lang.reflect.Array; |
| import java.lang.reflect.GenericArrayType; |
| import java.lang.reflect.Member; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.Type; |
| import java.lang.reflect.TypeVariable; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.ref.SoftReference; |
| import java.io.InputStream; |
| import java.io.ObjectStreamField; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.Map; |
| import java.util.HashMap; |
| import sun.misc.Unsafe; |
| import sun.reflect.ConstantPool; |
| import sun.reflect.Reflection; |
| import sun.reflect.ReflectionFactory; |
| import sun.reflect.generics.factory.CoreReflectionFactory; |
| import sun.reflect.generics.factory.GenericsFactory; |
| import sun.reflect.generics.repository.ClassRepository; |
| import sun.reflect.generics.repository.MethodRepository; |
| import sun.reflect.generics.repository.ConstructorRepository; |
| import sun.reflect.generics.scope.ClassScope; |
| import sun.security.util.SecurityConstants; |
| import java.lang.annotation.Annotation; |
| import sun.reflect.annotation.*; |
| |
| /** |
| * Instances of the class {@code Class} represent classes and |
| * interfaces in a running Java application. An enum is a kind of |
| * class and an annotation is a kind of interface. Every array also |
| * belongs to a class that is reflected as a {@code Class} object |
| * that is shared by all arrays with the same element type and number |
| * of dimensions. The primitive Java types ({@code boolean}, |
| * {@code byte}, {@code char}, {@code short}, |
| * {@code int}, {@code long}, {@code float}, and |
| * {@code double}), and the keyword {@code void} are also |
| * represented as {@code Class} objects. |
| * |
| * <p> {@code Class} has no public constructor. Instead {@code Class} |
| * objects are constructed automatically by the Java Virtual Machine as classes |
| * are loaded and by calls to the {@code defineClass} method in the class |
| * loader. |
| * |
| * <p> The following example uses a {@code Class} object to print the |
| * class name of an object: |
| * |
| * <p> <blockquote><pre> |
| * void printClassName(Object obj) { |
| * System.out.println("The class of " + obj + |
| * " is " + obj.getClass().getName()); |
| * } |
| * </pre></blockquote> |
| * |
| * <p> It is also possible to get the {@code Class} object for a named |
| * type (or for void) using a class literal. See Section 15.8.2 of |
| * <cite>The Java™ Language Specification</cite>. |
| * For example: |
| * |
| * <p> <blockquote> |
| * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} |
| * </blockquote> |
| * |
| * @param <T> the type of the class modeled by this {@code Class} |
| * object. For example, the type of {@code String.class} is {@code |
| * Class<String>}. Use {@code Class<?>} if the class being modeled is |
| * unknown. |
| * |
| * @author unascribed |
| * @see java.lang.ClassLoader#defineClass(byte[], int, int) |
| * @since JDK1.0 |
| */ |
| public final |
| class Class<T> implements java.io.Serializable, |
| java.lang.reflect.GenericDeclaration, |
| java.lang.reflect.Type, |
| java.lang.reflect.AnnotatedElement { |
| private static final int ANNOTATION= 0x00002000; |
| private static final int ENUM = 0x00004000; |
| private static final int SYNTHETIC = 0x00001000; |
| |
| private static native void registerNatives(); |
| static { |
| registerNatives(); |
| } |
| |
| /* |
| * Constructor. Only the Java Virtual Machine creates Class |
| * objects. |
| */ |
| private Class() {} |
| |
| |
| /** |
| * Converts the object to a string. The string representation is the |
| * string "class" or "interface", followed by a space, and then by the |
| * fully qualified name of the class in the format returned by |
| * {@code getName}. If this {@code Class} object represents a |
| * primitive type, this method returns the name of the primitive type. If |
| * this {@code Class} object represents void this method returns |
| * "void". |
| * |
| * @return a string representation of this class object. |
| */ |
| public String toString() { |
| return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) |
| + getName(); |
| } |
| |
| |
| /** |
| * Returns the {@code Class} object associated with the class or |
| * interface with the given string name. Invoking this method is |
| * equivalent to: |
| * |
| * <blockquote> |
| * {@code Class.forName(className, true, currentLoader)} |
| * </blockquote> |
| * |
| * where {@code currentLoader} denotes the defining class loader of |
| * the current class. |
| * |
| * <p> For example, the following code fragment returns the |
| * runtime {@code Class} descriptor for the class named |
| * {@code java.lang.Thread}: |
| * |
| * <blockquote> |
| * {@code Class t = Class.forName("java.lang.Thread")} |
| * </blockquote> |
| * <p> |
| * A call to {@code forName("X")} causes the class named |
| * {@code X} to be initialized. |
| * |
| * @param className the fully qualified name of the desired class. |
| * @return the {@code Class} object for the class with the |
| * specified name. |
| * @exception LinkageError if the linkage fails |
| * @exception ExceptionInInitializerError if the initialization provoked |
| * by this method fails |
| * @exception ClassNotFoundException if the class cannot be located |
| */ |
| public static Class<?> forName(String className) |
| throws ClassNotFoundException { |
| return forName0(className, true, ClassLoader.getCallerClassLoader()); |
| } |
| |
| |
| /** |
| * Returns the {@code Class} object associated with the class or |
| * interface with the given string name, using the given class loader. |
| * Given the fully qualified name for a class or interface (in the same |
| * format returned by {@code getName}) this method attempts to |
| * locate, load, and link the class or interface. The specified class |
| * loader is used to load the class or interface. If the parameter |
| * {@code loader} is null, the class is loaded through the bootstrap |
| * class loader. The class is initialized only if the |
| * {@code initialize} parameter is {@code true} and if it has |
| * not been initialized earlier. |
| * |
| * <p> If {@code name} denotes a primitive type or void, an attempt |
| * will be made to locate a user-defined class in the unnamed package whose |
| * name is {@code name}. Therefore, this method cannot be used to |
| * obtain any of the {@code Class} objects representing primitive |
| * types or void. |
| * |
| * <p> If {@code name} denotes an array class, the component type of |
| * the array class is loaded but not initialized. |
| * |
| * <p> For example, in an instance method the expression: |
| * |
| * <blockquote> |
| * {@code Class.forName("Foo")} |
| * </blockquote> |
| * |
| * is equivalent to: |
| * |
| * <blockquote> |
| * {@code Class.forName("Foo", true, this.getClass().getClassLoader())} |
| * </blockquote> |
| * |
| * Note that this method throws errors related to loading, linking or |
| * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The |
| * Java Language Specification</em>. |
| * Note that this method does not check whether the requested class |
| * is accessible to its caller. |
| * |
| * <p> If the {@code loader} is {@code null}, and a security |
| * manager is present, and the caller's class loader is not null, then this |
| * method calls the security manager's {@code checkPermission} method |
| * with a {@code RuntimePermission("getClassLoader")} permission to |
| * ensure it's ok to access the bootstrap class loader. |
| * |
| * @param name fully qualified name of the desired class |
| * @param initialize whether the class must be initialized |
| * @param loader class loader from which the class must be loaded |
| * @return class object representing the desired class |
| * |
| * @exception LinkageError if the linkage fails |
| * @exception ExceptionInInitializerError if the initialization provoked |
| * by this method fails |
| * @exception ClassNotFoundException if the class cannot be located by |
| * the specified class loader |
| * |
| * @see java.lang.Class#forName(String) |
| * @see java.lang.ClassLoader |
| * @since 1.2 |
| */ |
| public static Class<?> forName(String name, boolean initialize, |
| ClassLoader loader) |
| throws ClassNotFoundException |
| { |
| if (loader == null) { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| ClassLoader ccl = ClassLoader.getCallerClassLoader(); |
| if (ccl != null) { |
| sm.checkPermission( |
| SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| } |
| } |
| } |
| return forName0(name, initialize, loader); |
| } |
| |
| /** Called after security checks have been made. */ |
| private static native Class<?> forName0(String name, boolean initialize, |
| ClassLoader loader) |
| throws ClassNotFoundException; |
| |
| /** |
| * Creates a new instance of the class represented by this {@code Class} |
| * object. The class is instantiated as if by a {@code new} |
| * expression with an empty argument list. The class is initialized if it |
| * has not already been initialized. |
| * |
| * <p>Note that this method propagates any exception thrown by the |
| * nullary constructor, including a checked exception. Use of |
| * this method effectively bypasses the compile-time exception |
| * checking that would otherwise be performed by the compiler. |
| * The {@link |
| * java.lang.reflect.Constructor#newInstance(java.lang.Object...) |
| * Constructor.newInstance} method avoids this problem by wrapping |
| * any exception thrown by the constructor in a (checked) {@link |
| * java.lang.reflect.InvocationTargetException}. |
| * |
| * @return a newly allocated instance of the class represented by this |
| * object. |
| * @exception IllegalAccessException if the class or its nullary |
| * constructor is not accessible. |
| * @exception InstantiationException |
| * if this {@code Class} represents an abstract class, |
| * an interface, an array class, a primitive type, or void; |
| * or if the class has no nullary constructor; |
| * or if the instantiation fails for some other reason. |
| * @exception ExceptionInInitializerError if the initialization |
| * provoked by this method fails. |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| * creation of new instances of this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| */ |
| public T newInstance() |
| throws InstantiationException, IllegalAccessException |
| { |
| if (System.getSecurityManager() != null) { |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| } |
| return newInstance0(); |
| } |
| |
| private T newInstance0() |
| throws InstantiationException, IllegalAccessException |
| { |
| // NOTE: the following code may not be strictly correct under |
| // the current Java memory model. |
| |
| // Constructor lookup |
| if (cachedConstructor == null) { |
| if (this == Class.class) { |
| throw new IllegalAccessException( |
| "Can not call newInstance() on the Class for java.lang.Class" |
| ); |
| } |
| try { |
| Class<?>[] empty = {}; |
| final Constructor<T> c = getConstructor0(empty, Member.DECLARED); |
| // Disable accessibility checks on the constructor |
| // since we have to do the security check here anyway |
| // (the stack depth is wrong for the Constructor's |
| // security check to work) |
| java.security.AccessController.doPrivileged( |
| new java.security.PrivilegedAction<Void>() { |
| public Void run() { |
| c.setAccessible(true); |
| return null; |
| } |
| }); |
| cachedConstructor = c; |
| } catch (NoSuchMethodException e) { |
| throw (InstantiationException) |
| new InstantiationException(getName()).initCause(e); |
| } |
| } |
| Constructor<T> tmpConstructor = cachedConstructor; |
| // Security check (same as in java.lang.reflect.Constructor) |
| int modifiers = tmpConstructor.getModifiers(); |
| if (!Reflection.quickCheckMemberAccess(this, modifiers)) { |
| Class<?> caller = Reflection.getCallerClass(3); |
| if (newInstanceCallerCache != caller) { |
| Reflection.ensureMemberAccess(caller, this, null, modifiers); |
| newInstanceCallerCache = caller; |
| } |
| } |
| // Run constructor |
| try { |
| return tmpConstructor.newInstance((Object[])null); |
| } catch (InvocationTargetException e) { |
| Unsafe.getUnsafe().throwException(e.getTargetException()); |
| // Not reached |
| return null; |
| } |
| } |
| private volatile transient Constructor<T> cachedConstructor; |
| private volatile transient Class<?> newInstanceCallerCache; |
| |
| |
| /** |
| * Determines if the specified {@code Object} is assignment-compatible |
| * with the object represented by this {@code Class}. This method is |
| * the dynamic equivalent of the Java language {@code instanceof} |
| * operator. The method returns {@code true} if the specified |
| * {@code Object} argument is non-null and can be cast to the |
| * reference type represented by this {@code Class} object without |
| * raising a {@code ClassCastException.} It returns {@code false} |
| * otherwise. |
| * |
| * <p> Specifically, if this {@code Class} object represents a |
| * declared class, this method returns {@code true} if the specified |
| * {@code Object} argument is an instance of the represented class (or |
| * of any of its subclasses); it returns {@code false} otherwise. If |
| * this {@code Class} object represents an array class, this method |
| * returns {@code true} if the specified {@code Object} argument |
| * can be converted to an object of the array class by an identity |
| * conversion or by a widening reference conversion; it returns |
| * {@code false} otherwise. If this {@code Class} object |
| * represents an interface, this method returns {@code true} if the |
| * class or any superclass of the specified {@code Object} argument |
| * implements this interface; it returns {@code false} otherwise. If |
| * this {@code Class} object represents a primitive type, this method |
| * returns {@code false}. |
| * |
| * @param obj the object to check |
| * @return true if {@code obj} is an instance of this class |
| * |
| * @since JDK1.1 |
| */ |
| public native boolean isInstance(Object obj); |
| |
| |
| /** |
| * Determines if the class or interface represented by this |
| * {@code Class} object is either the same as, or is a superclass or |
| * superinterface of, the class or interface represented by the specified |
| * {@code Class} parameter. It returns {@code true} if so; |
| * otherwise it returns {@code false}. If this {@code Class} |
| * object represents a primitive type, this method returns |
| * {@code true} if the specified {@code Class} parameter is |
| * exactly this {@code Class} object; otherwise it returns |
| * {@code false}. |
| * |
| * <p> Specifically, this method tests whether the type represented by the |
| * specified {@code Class} parameter can be converted to the type |
| * represented by this {@code Class} object via an identity conversion |
| * or via a widening reference conversion. See <em>The Java Language |
| * Specification</em>, sections 5.1.1 and 5.1.4 , for details. |
| * |
| * @param cls the {@code Class} object to be checked |
| * @return the {@code boolean} value indicating whether objects of the |
| * type {@code cls} can be assigned to objects of this class |
| * @exception NullPointerException if the specified Class parameter is |
| * null. |
| * @since JDK1.1 |
| */ |
| public native boolean isAssignableFrom(Class<?> cls); |
| |
| |
| /** |
| * Determines if the specified {@code Class} object represents an |
| * interface type. |
| * |
| * @return {@code true} if this object represents an interface; |
| * {@code false} otherwise. |
| */ |
| public native boolean isInterface(); |
| |
| |
| /** |
| * Determines if this {@code Class} object represents an array class. |
| * |
| * @return {@code true} if this object represents an array class; |
| * {@code false} otherwise. |
| * @since JDK1.1 |
| */ |
| public native boolean isArray(); |
| |
| |
| /** |
| * Determines if the specified {@code Class} object represents a |
| * primitive type. |
| * |
| * <p> There are nine predefined {@code Class} objects to represent |
| * the eight primitive types and void. These are created by the Java |
| * Virtual Machine, and have the same names as the primitive types that |
| * they represent, namely {@code boolean}, {@code byte}, |
| * {@code char}, {@code short}, {@code int}, |
| * {@code long}, {@code float}, and {@code double}. |
| * |
| * <p> These objects may only be accessed via the following public static |
| * final variables, and are the only {@code Class} objects for which |
| * this method returns {@code true}. |
| * |
| * @return true if and only if this class represents a primitive type |
| * |
| * @see java.lang.Boolean#TYPE |
| * @see java.lang.Character#TYPE |
| * @see java.lang.Byte#TYPE |
| * @see java.lang.Short#TYPE |
| * @see java.lang.Integer#TYPE |
| * @see java.lang.Long#TYPE |
| * @see java.lang.Float#TYPE |
| * @see java.lang.Double#TYPE |
| * @see java.lang.Void#TYPE |
| * @since JDK1.1 |
| */ |
| public native boolean isPrimitive(); |
| |
| /** |
| * Returns true if this {@code Class} object represents an annotation |
| * type. Note that if this method returns true, {@link #isInterface()} |
| * would also return true, as all annotation types are also interfaces. |
| * |
| * @return {@code true} if this class object represents an annotation |
| * type; {@code false} otherwise |
| * @since 1.5 |
| */ |
| public boolean isAnnotation() { |
| return (getModifiers() & ANNOTATION) != 0; |
| } |
| |
| /** |
| * Returns {@code true} if this class is a synthetic class; |
| * returns {@code false} otherwise. |
| * @return {@code true} if and only if this class is a synthetic class as |
| * defined by the Java Language Specification. |
| * @since 1.5 |
| */ |
| public boolean isSynthetic() { |
| return (getModifiers() & SYNTHETIC) != 0; |
| } |
| |
| /** |
| * Returns the name of the entity (class, interface, array class, |
| * primitive type, or void) represented by this {@code Class} object, |
| * as a {@code String}. |
| * |
| * <p> If this class object represents a reference type that is not an |
| * array type then the binary name of the class is returned, as specified |
| * by |
| * <cite>The Java™ Language Specification</cite>. |
| * |
| * <p> If this class object represents a primitive type or void, then the |
| * name returned is a {@code String} equal to the Java language |
| * keyword corresponding to the primitive type or void. |
| * |
| * <p> If this class object represents a class of arrays, then the internal |
| * form of the name consists of the name of the element type preceded by |
| * one or more '{@code [}' characters representing the depth of the array |
| * nesting. The encoding of element type names is as follows: |
| * |
| * <blockquote><table summary="Element types and encodings"> |
| * <tr><th> Element Type <th> <th> Encoding |
| * <tr><td> boolean <td> <td align=center> Z |
| * <tr><td> byte <td> <td align=center> B |
| * <tr><td> char <td> <td align=center> C |
| * <tr><td> class or interface |
| * <td> <td align=center> L<i>classname</i>; |
| * <tr><td> double <td> <td align=center> D |
| * <tr><td> float <td> <td align=center> F |
| * <tr><td> int <td> <td align=center> I |
| * <tr><td> long <td> <td align=center> J |
| * <tr><td> short <td> <td align=center> S |
| * </table></blockquote> |
| * |
| * <p> The class or interface name <i>classname</i> is the binary name of |
| * the class specified above. |
| * |
| * <p> Examples: |
| * <blockquote><pre> |
| * String.class.getName() |
| * returns "java.lang.String" |
| * byte.class.getName() |
| * returns "byte" |
| * (new Object[3]).getClass().getName() |
| * returns "[Ljava.lang.Object;" |
| * (new int[3][4][5][6][7][8][9]).getClass().getName() |
| * returns "[[[[[[[I" |
| * </pre></blockquote> |
| * |
| * @return the name of the class or interface |
| * represented by this object. |
| */ |
| public String getName() { |
| String name = this.name; |
| if (name == null) |
| this.name = name = getName0(); |
| return name; |
| } |
| |
| // cache the name to reduce the number of calls into the VM |
| private transient String name; |
| private native String getName0(); |
| |
| /** |
| * Returns the class loader for the class. Some implementations may use |
| * null to represent the bootstrap class loader. This method will return |
| * null in such implementations if this class was loaded by the bootstrap |
| * class loader. |
| * |
| * <p> If a security manager is present, and the caller's class loader is |
| * not null and the caller's class loader is not the same as or an ancestor of |
| * the class loader for the class whose class loader is requested, then |
| * this method calls the security manager's {@code checkPermission} |
| * method with a {@code RuntimePermission("getClassLoader")} |
| * permission to ensure it's ok to access the class loader for the class. |
| * |
| * <p>If this object |
| * represents a primitive type or void, null is returned. |
| * |
| * @return the class loader that loaded the class or interface |
| * represented by this object. |
| * @throws SecurityException |
| * if a security manager exists and its |
| * {@code checkPermission} method denies |
| * access to the class loader for the class. |
| * @see java.lang.ClassLoader |
| * @see SecurityManager#checkPermission |
| * @see java.lang.RuntimePermission |
| */ |
| public ClassLoader getClassLoader() { |
| ClassLoader cl = getClassLoader0(); |
| if (cl == null) |
| return null; |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| ClassLoader ccl = ClassLoader.getCallerClassLoader(); |
| if (ccl != null && ccl != cl && !cl.isAncestor(ccl)) { |
| sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| } |
| } |
| return cl; |
| } |
| |
| // Package-private to allow ClassLoader access |
| native ClassLoader getClassLoader0(); |
| |
| |
| /** |
| * Returns an array of {@code TypeVariable} objects that represent the |
| * type variables declared by the generic declaration represented by this |
| * {@code GenericDeclaration} object, in declaration order. Returns an |
| * array of length 0 if the underlying generic declaration declares no type |
| * variables. |
| * |
| * @return an array of {@code TypeVariable} objects that represent |
| * the type variables declared by this generic declaration |
| * @throws java.lang.reflect.GenericSignatureFormatError if the generic |
| * signature of this generic declaration does not conform to |
| * the format specified in |
| * <cite>The Java™ Virtual Machine Specification</cite> |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| public TypeVariable<Class<T>>[] getTypeParameters() { |
| if (getGenericSignature() != null) |
| return (TypeVariable<Class<T>>[])getGenericInfo().getTypeParameters(); |
| else |
| return (TypeVariable<Class<T>>[])new TypeVariable<?>[0]; |
| } |
| |
| |
| /** |
| * Returns the {@code Class} representing the superclass of the entity |
| * (class, interface, primitive type or void) represented by this |
| * {@code Class}. If this {@code Class} represents either the |
| * {@code Object} class, an interface, a primitive type, or void, then |
| * null is returned. If this object represents an array class then the |
| * {@code Class} object representing the {@code Object} class is |
| * returned. |
| * |
| * @return the superclass of the class represented by this object. |
| */ |
| public native Class<? super T> getSuperclass(); |
| |
| |
| /** |
| * Returns the {@code Type} representing the direct superclass of |
| * the entity (class, interface, primitive type or void) represented by |
| * this {@code Class}. |
| * |
| * <p>If the superclass is a parameterized type, the {@code Type} |
| * object returned must accurately reflect the actual type |
| * parameters used in the source code. The parameterized type |
| * representing the superclass is created if it had not been |
| * created before. See the declaration of {@link |
| * java.lang.reflect.ParameterizedType ParameterizedType} for the |
| * semantics of the creation process for parameterized types. If |
| * this {@code Class} represents either the {@code Object} |
| * class, an interface, a primitive type, or void, then null is |
| * returned. If this object represents an array class then the |
| * {@code Class} object representing the {@code Object} class is |
| * returned. |
| * |
| * @throws java.lang.reflect.GenericSignatureFormatError if the generic |
| * class signature does not conform to the format specified in |
| * <cite>The Java™ Virtual Machine Specification</cite> |
| * @throws TypeNotPresentException if the generic superclass |
| * refers to a non-existent type declaration |
| * @throws java.lang.reflect.MalformedParameterizedTypeException if the |
| * generic superclass refers to a parameterized type that cannot be |
| * instantiated for any reason |
| * @return the superclass of the class represented by this object |
| * @since 1.5 |
| */ |
| public Type getGenericSuperclass() { |
| if (getGenericSignature() != null) { |
| // Historical irregularity: |
| // Generic signature marks interfaces with superclass = Object |
| // but this API returns null for interfaces |
| if (isInterface()) |
| return null; |
| return getGenericInfo().getSuperclass(); |
| } else |
| return getSuperclass(); |
| } |
| |
| /** |
| * Gets the package for this class. The class loader of this class is used |
| * to find the package. If the class was loaded by the bootstrap class |
| * loader the set of packages loaded from CLASSPATH is searched to find the |
| * package of the class. Null is returned if no package object was created |
| * by the class loader of this class. |
| * |
| * <p> Packages have attributes for versions and specifications only if the |
| * information was defined in the manifests that accompany the classes, and |
| * if the class loader created the package instance with the attributes |
| * from the manifest. |
| * |
| * @return the package of the class, or null if no package |
| * information is available from the archive or codebase. |
| */ |
| public Package getPackage() { |
| return Package.getPackage(this); |
| } |
| |
| |
| /** |
| * Determines the interfaces implemented by the class or interface |
| * represented by this object. |
| * |
| * <p> If this object represents a class, the return value is an array |
| * containing objects representing all interfaces implemented by the |
| * class. The order of the interface objects in the array corresponds to |
| * the order of the interface names in the {@code implements} clause |
| * of the declaration of the class represented by this object. For |
| * example, given the declaration: |
| * <blockquote> |
| * {@code class Shimmer implements FloorWax, DessertTopping { ... }} |
| * </blockquote> |
| * suppose the value of {@code s} is an instance of |
| * {@code Shimmer}; the value of the expression: |
| * <blockquote> |
| * {@code s.getClass().getInterfaces()[0]} |
| * </blockquote> |
| * is the {@code Class} object that represents interface |
| * {@code FloorWax}; and the value of: |
| * <blockquote> |
| * {@code s.getClass().getInterfaces()[1]} |
| * </blockquote> |
| * is the {@code Class} object that represents interface |
| * {@code DessertTopping}. |
| * |
| * <p> If this object represents an interface, the array contains objects |
| * representing all interfaces extended by the interface. The order of the |
| * interface objects in the array corresponds to the order of the interface |
| * names in the {@code extends} clause of the declaration of the |
| * interface represented by this object. |
| * |
| * <p> If this object represents a class or interface that implements no |
| * interfaces, the method returns an array of length 0. |
| * |
| * <p> If this object represents a primitive type or void, the method |
| * returns an array of length 0. |
| * |
| * @return an array of interfaces implemented by this class. |
| */ |
| public native Class<?>[] getInterfaces(); |
| |
| /** |
| * Returns the {@code Type}s representing the interfaces |
| * directly implemented by the class or interface represented by |
| * this object. |
| * |
| * <p>If a superinterface is a parameterized type, the |
| * {@code Type} object returned for it must accurately reflect |
| * the actual type parameters used in the source code. The |
| * parameterized type representing each superinterface is created |
| * if it had not been created before. See the declaration of |
| * {@link java.lang.reflect.ParameterizedType ParameterizedType} |
| * for the semantics of the creation process for parameterized |
| * types. |
| * |
| * <p> If this object represents a class, the return value is an |
| * array containing objects representing all interfaces |
| * implemented by the class. The order of the interface objects in |
| * the array corresponds to the order of the interface names in |
| * the {@code implements} clause of the declaration of the class |
| * represented by this object. In the case of an array class, the |
| * interfaces {@code Cloneable} and {@code Serializable} are |
| * returned in that order. |
| * |
| * <p>If this object represents an interface, the array contains |
| * objects representing all interfaces directly extended by the |
| * interface. The order of the interface objects in the array |
| * corresponds to the order of the interface names in the |
| * {@code extends} clause of the declaration of the interface |
| * represented by this object. |
| * |
| * <p>If this object represents a class or interface that |
| * implements no interfaces, the method returns an array of length |
| * 0. |
| * |
| * <p>If this object represents a primitive type or void, the |
| * method returns an array of length 0. |
| * |
| * @throws java.lang.reflect.GenericSignatureFormatError |
| * if the generic class signature does not conform to the format |
| * specified in |
| * <cite>The Java™ Virtual Machine Specification</cite> |
| * @throws TypeNotPresentException if any of the generic |
| * superinterfaces refers to a non-existent type declaration |
| * @throws java.lang.reflect.MalformedParameterizedTypeException |
| * if any of the generic superinterfaces refer to a parameterized |
| * type that cannot be instantiated for any reason |
| * @return an array of interfaces implemented by this class |
| * @since 1.5 |
| */ |
| public Type[] getGenericInterfaces() { |
| if (getGenericSignature() != null) |
| return getGenericInfo().getSuperInterfaces(); |
| else |
| return getInterfaces(); |
| } |
| |
| |
| /** |
| * Returns the {@code Class} representing the component type of an |
| * array. If this class does not represent an array class this method |
| * returns null. |
| * |
| * @return the {@code Class} representing the component type of this |
| * class if this class is an array |
| * @see java.lang.reflect.Array |
| * @since JDK1.1 |
| */ |
| public native Class<?> getComponentType(); |
| |
| |
| /** |
| * Returns the Java language modifiers for this class or interface, encoded |
| * in an integer. The modifiers consist of the Java Virtual Machine's |
| * constants for {@code public}, {@code protected}, |
| * {@code private}, {@code final}, {@code static}, |
| * {@code abstract} and {@code interface}; they should be decoded |
| * using the methods of class {@code Modifier}. |
| * |
| * <p> If the underlying class is an array class, then its |
| * {@code public}, {@code private} and {@code protected} |
| * modifiers are the same as those of its component type. If this |
| * {@code Class} represents a primitive type or void, its |
| * {@code public} modifier is always {@code true}, and its |
| * {@code protected} and {@code private} modifiers are always |
| * {@code false}. If this object represents an array class, a |
| * primitive type or void, then its {@code final} modifier is always |
| * {@code true} and its interface modifier is always |
| * {@code false}. The values of its other modifiers are not determined |
| * by this specification. |
| * |
| * <p> The modifier encodings are defined in <em>The Java Virtual Machine |
| * Specification</em>, table 4.1. |
| * |
| * @return the {@code int} representing the modifiers for this class |
| * @see java.lang.reflect.Modifier |
| * @since JDK1.1 |
| */ |
| public native int getModifiers(); |
| |
| |
| /** |
| * Gets the signers of this class. |
| * |
| * @return the signers of this class, or null if there are no signers. In |
| * particular, this method returns null if this object represents |
| * a primitive type or void. |
| * @since JDK1.1 |
| */ |
| public native Object[] getSigners(); |
| |
| |
| /** |
| * Set the signers of this class. |
| */ |
| native void setSigners(Object[] signers); |
| |
| |
| /** |
| * If this {@code Class} object represents a local or anonymous |
| * class within a method, returns a {@link |
| * java.lang.reflect.Method Method} object representing the |
| * immediately enclosing method of the underlying class. Returns |
| * {@code null} otherwise. |
| * |
| * In particular, this method returns {@code null} if the underlying |
| * class is a local or anonymous class immediately enclosed by a type |
| * declaration, instance initializer or static initializer. |
| * |
| * @return the immediately enclosing method of the underlying class, if |
| * that class is a local or anonymous class; otherwise {@code null}. |
| * @since 1.5 |
| */ |
| public Method getEnclosingMethod() { |
| EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| |
| if (enclosingInfo == null) |
| return null; |
| else { |
| if (!enclosingInfo.isMethod()) |
| return null; |
| |
| MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(), |
| getFactory()); |
| Class<?> returnType = toClass(typeInfo.getReturnType()); |
| Type [] parameterTypes = typeInfo.getParameterTypes(); |
| Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; |
| |
| // Convert Types to Classes; returned types *should* |
| // be class objects since the methodDescriptor's used |
| // don't have generics information |
| for(int i = 0; i < parameterClasses.length; i++) |
| parameterClasses[i] = toClass(parameterTypes[i]); |
| |
| /* |
| * Loop over all declared methods; match method name, |
| * number of and type of parameters, *and* return |
| * type. Matching return type is also necessary |
| * because of covariant returns, etc. |
| */ |
| for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) { |
| if (m.getName().equals(enclosingInfo.getName()) ) { |
| Class<?>[] candidateParamClasses = m.getParameterTypes(); |
| if (candidateParamClasses.length == parameterClasses.length) { |
| boolean matches = true; |
| for(int i = 0; i < candidateParamClasses.length; i++) { |
| if (!candidateParamClasses[i].equals(parameterClasses[i])) { |
| matches = false; |
| break; |
| } |
| } |
| |
| if (matches) { // finally, check return type |
| if (m.getReturnType().equals(returnType) ) |
| return m; |
| } |
| } |
| } |
| } |
| |
| throw new InternalError("Enclosing method not found"); |
| } |
| } |
| |
| private native Object[] getEnclosingMethod0(); |
| |
| private EnclosingMethodInfo getEnclosingMethodInfo() { |
| Object[] enclosingInfo = getEnclosingMethod0(); |
| if (enclosingInfo == null) |
| return null; |
| else { |
| return new EnclosingMethodInfo(enclosingInfo); |
| } |
| } |
| |
| private final static class EnclosingMethodInfo { |
| private Class<?> enclosingClass; |
| private String name; |
| private String descriptor; |
| |
| private EnclosingMethodInfo(Object[] enclosingInfo) { |
| if (enclosingInfo.length != 3) |
| throw new InternalError("Malformed enclosing method information"); |
| try { |
| // The array is expected to have three elements: |
| |
| // the immediately enclosing class |
| enclosingClass = (Class<?>) enclosingInfo[0]; |
| assert(enclosingClass != null); |
| |
| // the immediately enclosing method or constructor's |
| // name (can be null). |
| name = (String) enclosingInfo[1]; |
| |
| // the immediately enclosing method or constructor's |
| // descriptor (null iff name is). |
| descriptor = (String) enclosingInfo[2]; |
| assert((name != null && descriptor != null) || name == descriptor); |
| } catch (ClassCastException cce) { |
| throw new InternalError("Invalid type in enclosing method information", cce); |
| } |
| } |
| |
| boolean isPartial() { |
| return enclosingClass == null || name == null || descriptor == null; |
| } |
| |
| boolean isConstructor() { return !isPartial() && "<init>".equals(name); } |
| |
| boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); } |
| |
| Class<?> getEnclosingClass() { return enclosingClass; } |
| |
| String getName() { return name; } |
| |
| String getDescriptor() { return descriptor; } |
| |
| } |
| |
| private static Class<?> toClass(Type o) { |
| if (o instanceof GenericArrayType) |
| return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()), |
| 0) |
| .getClass(); |
| return (Class<?>)o; |
| } |
| |
| /** |
| * If this {@code Class} object represents a local or anonymous |
| * class within a constructor, returns a {@link |
| * java.lang.reflect.Constructor Constructor} object representing |
| * the immediately enclosing constructor of the underlying |
| * class. Returns {@code null} otherwise. In particular, this |
| * method returns {@code null} if the underlying class is a local |
| * or anonymous class immediately enclosed by a type declaration, |
| * instance initializer or static initializer. |
| * |
| * @return the immediately enclosing constructor of the underlying class, if |
| * that class is a local or anonymous class; otherwise {@code null}. |
| * @since 1.5 |
| */ |
| public Constructor<?> getEnclosingConstructor() { |
| EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| |
| if (enclosingInfo == null) |
| return null; |
| else { |
| if (!enclosingInfo.isConstructor()) |
| return null; |
| |
| ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(), |
| getFactory()); |
| Type [] parameterTypes = typeInfo.getParameterTypes(); |
| Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; |
| |
| // Convert Types to Classes; returned types *should* |
| // be class objects since the methodDescriptor's used |
| // don't have generics information |
| for(int i = 0; i < parameterClasses.length; i++) |
| parameterClasses[i] = toClass(parameterTypes[i]); |
| |
| /* |
| * Loop over all declared constructors; match number |
| * of and type of parameters. |
| */ |
| for(Constructor<?> c: enclosingInfo.getEnclosingClass().getDeclaredConstructors()) { |
| Class<?>[] candidateParamClasses = c.getParameterTypes(); |
| if (candidateParamClasses.length == parameterClasses.length) { |
| boolean matches = true; |
| for(int i = 0; i < candidateParamClasses.length; i++) { |
| if (!candidateParamClasses[i].equals(parameterClasses[i])) { |
| matches = false; |
| break; |
| } |
| } |
| |
| if (matches) |
| return c; |
| } |
| } |
| |
| throw new InternalError("Enclosing constructor not found"); |
| } |
| } |
| |
| |
| /** |
| * If the class or interface represented by this {@code Class} object |
| * is a member of another class, returns the {@code Class} object |
| * representing the class in which it was declared. This method returns |
| * null if this class or interface is not a member of any other class. If |
| * this {@code Class} object represents an array class, a primitive |
| * type, or void,then this method returns null. |
| * |
| * @return the declaring class for this class |
| * @since JDK1.1 |
| */ |
| public native Class<?> getDeclaringClass(); |
| |
| |
| /** |
| * Returns the immediately enclosing class of the underlying |
| * class. If the underlying class is a top level class this |
| * method returns {@code null}. |
| * @return the immediately enclosing class of the underlying class |
| * @since 1.5 |
| */ |
| public Class<?> getEnclosingClass() { |
| // There are five kinds of classes (or interfaces): |
| // a) Top level classes |
| // b) Nested classes (static member classes) |
| // c) Inner classes (non-static member classes) |
| // d) Local classes (named classes declared within a method) |
| // e) Anonymous classes |
| |
| |
| // JVM Spec 4.8.6: A class must have an EnclosingMethod |
| // attribute if and only if it is a local class or an |
| // anonymous class. |
| EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); |
| |
| if (enclosingInfo == null) { |
| // This is a top level or a nested class or an inner class (a, b, or c) |
| return getDeclaringClass(); |
| } else { |
| Class<?> enclosingClass = enclosingInfo.getEnclosingClass(); |
| // This is a local class or an anonymous class (d or e) |
| if (enclosingClass == this || enclosingClass == null) |
| throw new InternalError("Malformed enclosing method information"); |
| else |
| return enclosingClass; |
| } |
| } |
| |
| /** |
| * Returns the simple name of the underlying class as given in the |
| * source code. Returns an empty string if the underlying class is |
| * anonymous. |
| * |
| * <p>The simple name of an array is the simple name of the |
| * component type with "[]" appended. In particular the simple |
| * name of an array whose component type is anonymous is "[]". |
| * |
| * @return the simple name of the underlying class |
| * @since 1.5 |
| */ |
| public String getSimpleName() { |
| if (isArray()) |
| return getComponentType().getSimpleName()+"[]"; |
| |
| String simpleName = getSimpleBinaryName(); |
| if (simpleName == null) { // top level class |
| simpleName = getName(); |
| return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name |
| } |
| // According to JLS3 "Binary Compatibility" (13.1) the binary |
| // name of non-package classes (not top level) is the binary |
| // name of the immediately enclosing class followed by a '$' followed by: |
| // (for nested and inner classes): the simple name. |
| // (for local classes): 1 or more digits followed by the simple name. |
| // (for anonymous classes): 1 or more digits. |
| |
| // Since getSimpleBinaryName() will strip the binary name of |
| // the immediatly enclosing class, we are now looking at a |
| // string that matches the regular expression "\$[0-9]*" |
| // followed by a simple name (considering the simple of an |
| // anonymous class to be the empty string). |
| |
| // Remove leading "\$[0-9]*" from the name |
| int length = simpleName.length(); |
| if (length < 1 || simpleName.charAt(0) != '$') |
| throw new InternalError("Malformed class name"); |
| int index = 1; |
| while (index < length && isAsciiDigit(simpleName.charAt(index))) |
| index++; |
| // Eventually, this is the empty string iff this is an anonymous class |
| return simpleName.substring(index); |
| } |
| |
| /** |
| * Character.isDigit answers {@code true} to some non-ascii |
| * digits. This one does not. |
| */ |
| private static boolean isAsciiDigit(char c) { |
| return '0' <= c && c <= '9'; |
| } |
| |
| /** |
| * Returns the canonical name of the underlying class as |
| * defined by the Java Language Specification. Returns null if |
| * the underlying class does not have a canonical name (i.e., if |
| * it is a local or anonymous class or an array whose component |
| * type does not have a canonical name). |
| * @return the canonical name of the underlying class if it exists, and |
| * {@code null} otherwise. |
| * @since 1.5 |
| */ |
| public String getCanonicalName() { |
| if (isArray()) { |
| String canonicalName = getComponentType().getCanonicalName(); |
| if (canonicalName != null) |
| return canonicalName + "[]"; |
| else |
| return null; |
| } |
| if (isLocalOrAnonymousClass()) |
| return null; |
| Class<?> enclosingClass = getEnclosingClass(); |
| if (enclosingClass == null) { // top level class |
| return getName(); |
| } else { |
| String enclosingName = enclosingClass.getCanonicalName(); |
| if (enclosingName == null) |
| return null; |
| return enclosingName + "." + getSimpleName(); |
| } |
| } |
| |
| /** |
| * Returns {@code true} if and only if the underlying class |
| * is an anonymous class. |
| * |
| * @return {@code true} if and only if this class is an anonymous class. |
| * @since 1.5 |
| */ |
| public boolean isAnonymousClass() { |
| return "".equals(getSimpleName()); |
| } |
| |
| /** |
| * Returns {@code true} if and only if the underlying class |
| * is a local class. |
| * |
| * @return {@code true} if and only if this class is a local class. |
| * @since 1.5 |
| */ |
| public boolean isLocalClass() { |
| return isLocalOrAnonymousClass() && !isAnonymousClass(); |
| } |
| |
| /** |
| * Returns {@code true} if and only if the underlying class |
| * is a member class. |
| * |
| * @return {@code true} if and only if this class is a member class. |
| * @since 1.5 |
| */ |
| public boolean isMemberClass() { |
| return getSimpleBinaryName() != null && !isLocalOrAnonymousClass(); |
| } |
| |
| /** |
| * Returns the "simple binary name" of the underlying class, i.e., |
| * the binary name without the leading enclosing class name. |
| * Returns {@code null} if the underlying class is a top level |
| * class. |
| */ |
| private String getSimpleBinaryName() { |
| Class<?> enclosingClass = getEnclosingClass(); |
| if (enclosingClass == null) // top level class |
| return null; |
| // Otherwise, strip the enclosing class' name |
| try { |
| return getName().substring(enclosingClass.getName().length()); |
| } catch (IndexOutOfBoundsException ex) { |
| throw new InternalError("Malformed class name", ex); |
| } |
| } |
| |
| /** |
| * Returns {@code true} if this is a local class or an anonymous |
| * class. Returns {@code false} otherwise. |
| */ |
| private boolean isLocalOrAnonymousClass() { |
| // JVM Spec 4.8.6: A class must have an EnclosingMethod |
| // attribute if and only if it is a local class or an |
| // anonymous class. |
| return getEnclosingMethodInfo() != null; |
| } |
| |
| /** |
| * Returns an array containing {@code Class} objects representing all |
| * the public classes and interfaces that are members of the class |
| * represented by this {@code Class} object. This includes public |
| * class and interface members inherited from superclasses and public class |
| * and interface members declared by the class. This method returns an |
| * array of length 0 if this {@code Class} object has no public member |
| * classes or interfaces. This method also returns an array of length 0 if |
| * this {@code Class} object represents a primitive type, an array |
| * class, or void. |
| * |
| * @return the array of {@code Class} objects representing the public |
| * members of this class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} method |
| * denies access to the classes within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Class<?>[] getClasses() { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| |
| // Privileged so this implementation can look at DECLARED classes, |
| // something the caller might not have privilege to do. The code here |
| // is allowed to look at DECLARED classes because (1) it does not hand |
| // out anything other than public members and (2) public member access |
| // has already been ok'd by the SecurityManager. |
| |
| return java.security.AccessController.doPrivileged( |
| new java.security.PrivilegedAction<Class<?>[]>() { |
| public Class<?>[] run() { |
| List<Class<?>> list = new ArrayList<>(); |
| Class<?> currentClass = Class.this; |
| while (currentClass != null) { |
| Class<?>[] members = currentClass.getDeclaredClasses(); |
| for (int i = 0; i < members.length; i++) { |
| if (Modifier.isPublic(members[i].getModifiers())) { |
| list.add(members[i]); |
| } |
| } |
| currentClass = currentClass.getSuperclass(); |
| } |
| return list.toArray(new Class<?>[0]); |
| } |
| }); |
| } |
| |
| |
| /** |
| * Returns an array containing {@code Field} objects reflecting all |
| * the accessible public fields of the class or interface represented by |
| * this {@code Class} object. The elements in the array returned are |
| * not sorted and are not in any particular order. This method returns an |
| * array of length 0 if the class or interface has no accessible public |
| * fields, or if it represents an array class, a primitive type, or void. |
| * |
| * <p> Specifically, if this {@code Class} object represents a class, |
| * this method returns the public fields of this class and of all its |
| * superclasses. If this {@code Class} object represents an |
| * interface, this method returns the fields of this interface and of all |
| * its superinterfaces. |
| * |
| * <p> The implicit length field for array class is not reflected by this |
| * method. User code should use the methods of class {@code Array} to |
| * manipulate arrays. |
| * |
| * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. |
| * |
| * @return the array of {@code Field} objects representing the |
| * public fields |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| * access to the fields within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Field[] getFields() throws SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| return copyFields(privateGetPublicFields(null)); |
| } |
| |
| |
| /** |
| * Returns an array containing {@code Method} objects reflecting all |
| * the public <em>member</em> methods of the class or interface represented |
| * by this {@code Class} object, including those declared by the class |
| * or interface and those inherited from superclasses and |
| * superinterfaces. Array classes return all the (public) member methods |
| * inherited from the {@code Object} class. The elements in the array |
| * returned are not sorted and are not in any particular order. This |
| * method returns an array of length 0 if this {@code Class} object |
| * represents a class or interface that has no public member methods, or if |
| * this {@code Class} object represents a primitive type or void. |
| * |
| * <p> The class initialization method {@code <clinit>} is not |
| * included in the returned array. If the class declares multiple public |
| * member methods with the same parameter types, they are all included in |
| * the returned array. |
| * |
| * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4. |
| * |
| * @return the array of {@code Method} objects representing the |
| * public methods of this class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| * access to the methods within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Method[] getMethods() throws SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| return copyMethods(privateGetPublicMethods()); |
| } |
| |
| |
| /** |
| * Returns an array containing {@code Constructor} objects reflecting |
| * all the public constructors of the class represented by this |
| * {@code Class} object. An array of length 0 is returned if the |
| * class has no public constructors, or if the class is an array class, or |
| * if the class reflects a primitive type or void. |
| * |
| * Note that while this method returns an array of {@code |
| * Constructor<T>} objects (that is an array of constructors from |
| * this class), the return type of this method is {@code |
| * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as |
| * might be expected. This less informative return type is |
| * necessary since after being returned from this method, the |
| * array could be modified to hold {@code Constructor} objects for |
| * different classes, which would violate the type guarantees of |
| * {@code Constructor<T>[]}. |
| * |
| * @return the array of {@code Constructor} objects representing the |
| * public constructors of this class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| * access to the constructors within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Constructor<?>[] getConstructors() throws SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| return copyConstructors(privateGetDeclaredConstructors(true)); |
| } |
| |
| |
| /** |
| * Returns a {@code Field} object that reflects the specified public |
| * member field of the class or interface represented by this |
| * {@code Class} object. The {@code name} parameter is a |
| * {@code String} specifying the simple name of the desired field. |
| * |
| * <p> The field to be reflected is determined by the algorithm that |
| * follows. Let C be the class represented by this object: |
| * <OL> |
| * <LI> If C declares a public field with the name specified, that is the |
| * field to be reflected.</LI> |
| * <LI> If no field was found in step 1 above, this algorithm is applied |
| * recursively to each direct superinterface of C. The direct |
| * superinterfaces are searched in the order they were declared.</LI> |
| * <LI> If no field was found in steps 1 and 2 above, and C has a |
| * superclass S, then this algorithm is invoked recursively upon S. |
| * If C has no superclass, then a {@code NoSuchFieldException} |
| * is thrown.</LI> |
| * </OL> |
| * |
| * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. |
| * |
| * @param name the field name |
| * @return the {@code Field} object of this class specified by |
| * {@code name} |
| * @exception NoSuchFieldException if a field with the specified name is |
| * not found. |
| * @exception NullPointerException if {@code name} is {@code null} |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| * access to the field |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Field getField(String name) |
| throws NoSuchFieldException, SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| Field field = getField0(name); |
| if (field == null) { |
| throw new NoSuchFieldException(name); |
| } |
| return field; |
| } |
| |
| |
| /** |
| * Returns a {@code Method} object that reflects the specified public |
| * member method of the class or interface represented by this |
| * {@code Class} object. The {@code name} parameter is a |
| * {@code String} specifying the simple name of the desired method. The |
| * {@code parameterTypes} parameter is an array of {@code Class} |
| * objects that identify the method's formal parameter types, in declared |
| * order. If {@code parameterTypes} is {@code null}, it is |
| * treated as if it were an empty array. |
| * |
| * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a |
| * {@code NoSuchMethodException} is raised. Otherwise, the method to |
| * be reflected is determined by the algorithm that follows. Let C be the |
| * class represented by this object: |
| * <OL> |
| * <LI> C is searched for any <I>matching methods</I>. If no matching |
| * method is found, the algorithm of step 1 is invoked recursively on |
| * the superclass of C.</LI> |
| * <LI> If no method was found in step 1 above, the superinterfaces of C |
| * are searched for a matching method. If any such method is found, it |
| * is reflected.</LI> |
| * </OL> |
| * |
| * To find a matching method in a class C: If C declares exactly one |
| * public method with the specified name and exactly the same formal |
| * parameter types, that is the method reflected. If more than one such |
| * method is found in C, and one of these methods has a return type that is |
| * more specific than any of the others, that method is reflected; |
| * otherwise one of the methods is chosen arbitrarily. |
| * |
| * <p>Note that there may be more than one matching method in a |
| * class because while the Java language forbids a class to |
| * declare multiple methods with the same signature but different |
| * return types, the Java virtual machine does not. This |
| * increased flexibility in the virtual machine can be used to |
| * implement various language features. For example, covariant |
| * returns can be implemented with {@linkplain |
| * java.lang.reflect.Method#isBridge bridge methods}; the bridge |
| * method and the method being overridden would have the same |
| * signature but different return types. |
| * |
| * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4. |
| * |
| * @param name the name of the method |
| * @param parameterTypes the list of parameters |
| * @return the {@code Method} object that matches the specified |
| * {@code name} and {@code parameterTypes} |
| * @exception NoSuchMethodException if a matching method is not found |
| * or if the name is "<init>"or "<clinit>". |
| * @exception NullPointerException if {@code name} is {@code null} |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| * access to the method |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Method getMethod(String name, Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| Method method = getMethod0(name, parameterTypes); |
| if (method == null) { |
| throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); |
| } |
| return method; |
| } |
| |
| |
| /** |
| * Returns a {@code Constructor} object that reflects the specified |
| * public constructor of the class represented by this {@code Class} |
| * object. The {@code parameterTypes} parameter is an array of |
| * {@code Class} objects that identify the constructor's formal |
| * parameter types, in declared order. |
| * |
| * If this {@code Class} object represents an inner class |
| * declared in a non-static context, the formal parameter types |
| * include the explicit enclosing instance as the first parameter. |
| * |
| * <p> The constructor to reflect is the public constructor of the class |
| * represented by this {@code Class} object whose formal parameter |
| * types match those specified by {@code parameterTypes}. |
| * |
| * @param parameterTypes the parameter array |
| * @return the {@code Constructor} object of the public constructor that |
| * matches the specified {@code parameterTypes} |
| * @exception NoSuchMethodException if a matching method is not found. |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.PUBLIC)} denies |
| * access to the constructor |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Constructor<T> getConstructor(Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader()); |
| return getConstructor0(parameterTypes, Member.PUBLIC); |
| } |
| |
| |
| /** |
| * Returns an array of {@code Class} objects reflecting all the |
| * classes and interfaces declared as members of the class represented by |
| * this {@code Class} object. This includes public, protected, default |
| * (package) access, and private classes and interfaces declared by the |
| * class, but excludes inherited classes and interfaces. This method |
| * returns an array of length 0 if the class declares no classes or |
| * interfaces as members, or if this {@code Class} object represents a |
| * primitive type, an array class, or void. |
| * |
| * @return the array of {@code Class} objects representing all the |
| * declared members of this class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.DECLARED)} denies |
| * access to the declared classes within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Class<?>[] getDeclaredClasses() throws SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| return getDeclaredClasses0(); |
| } |
| |
| |
| /** |
| * Returns an array of {@code Field} objects reflecting all the fields |
| * declared by the class or interface represented by this |
| * {@code Class} object. This includes public, protected, default |
| * (package) access, and private fields, but excludes inherited fields. |
| * The elements in the array returned are not sorted and are not in any |
| * particular order. This method returns an array of length 0 if the class |
| * or interface declares no fields, or if this {@code Class} object |
| * represents a primitive type, an array class, or void. |
| * |
| * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3. |
| * |
| * @return the array of {@code Field} objects representing all the |
| * declared fields of this class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.DECLARED)} denies |
| * access to the declared fields within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Field[] getDeclaredFields() throws SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| return copyFields(privateGetDeclaredFields(false)); |
| } |
| |
| |
| /** |
| * Returns an array of {@code Method} objects reflecting all the |
| * methods declared by the class or interface represented by this |
| * {@code Class} object. This includes public, protected, default |
| * (package) access, and private methods, but excludes inherited methods. |
| * The elements in the array returned are not sorted and are not in any |
| * particular order. This method returns an array of length 0 if the class |
| * or interface declares no methods, or if this {@code Class} object |
| * represents a primitive type, an array class, or void. The class |
| * initialization method {@code <clinit>} is not included in the |
| * returned array. If the class declares multiple public member methods |
| * with the same parameter types, they are all included in the returned |
| * array. |
| * |
| * <p> See <em>The Java Language Specification</em>, section 8.2. |
| * |
| * @return the array of {@code Method} objects representing all the |
| * declared methods of this class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.DECLARED)} denies |
| * access to the declared methods within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Method[] getDeclaredMethods() throws SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| return copyMethods(privateGetDeclaredMethods(false)); |
| } |
| |
| |
| /** |
| * Returns an array of {@code Constructor} objects reflecting all the |
| * constructors declared by the class represented by this |
| * {@code Class} object. These are public, protected, default |
| * (package) access, and private constructors. The elements in the array |
| * returned are not sorted and are not in any particular order. If the |
| * class has a default constructor, it is included in the returned array. |
| * This method returns an array of length 0 if this {@code Class} |
| * object represents an interface, a primitive type, an array class, or |
| * void. |
| * |
| * <p> See <em>The Java Language Specification</em>, section 8.2. |
| * |
| * @return the array of {@code Constructor} objects representing all the |
| * declared constructors of this class |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.DECLARED)} denies |
| * access to the declared constructors within this class |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Constructor<?>[] getDeclaredConstructors() throws SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| return copyConstructors(privateGetDeclaredConstructors(false)); |
| } |
| |
| |
| /** |
| * Returns a {@code Field} object that reflects the specified declared |
| * field of the class or interface represented by this {@code Class} |
| * object. The {@code name} parameter is a {@code String} that |
| * specifies the simple name of the desired field. Note that this method |
| * will not reflect the {@code length} field of an array class. |
| * |
| * @param name the name of the field |
| * @return the {@code Field} object for the specified field in this |
| * class |
| * @exception NoSuchFieldException if a field with the specified name is |
| * not found. |
| * @exception NullPointerException if {@code name} is {@code null} |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.DECLARED)} denies |
| * access to the declared field |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Field getDeclaredField(String name) |
| throws NoSuchFieldException, SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| Field field = searchFields(privateGetDeclaredFields(false), name); |
| if (field == null) { |
| throw new NoSuchFieldException(name); |
| } |
| return field; |
| } |
| |
| |
| /** |
| * Returns a {@code Method} object that reflects the specified |
| * declared method of the class or interface represented by this |
| * {@code Class} object. The {@code name} parameter is a |
| * {@code String} that specifies the simple name of the desired |
| * method, and the {@code parameterTypes} parameter is an array of |
| * {@code Class} objects that identify the method's formal parameter |
| * types, in declared order. If more than one method with the same |
| * parameter types is declared in a class, and one of these methods has a |
| * return type that is more specific than any of the others, that method is |
| * returned; otherwise one of the methods is chosen arbitrarily. If the |
| * name is "<init>"or "<clinit>" a {@code NoSuchMethodException} |
| * is raised. |
| * |
| * @param name the name of the method |
| * @param parameterTypes the parameter array |
| * @return the {@code Method} object for the method of this class |
| * matching the specified name and parameters |
| * @exception NoSuchMethodException if a matching method is not found. |
| * @exception NullPointerException if {@code name} is {@code null} |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.DECLARED)} denies |
| * access to the declared method |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Method getDeclaredMethod(String name, Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); |
| if (method == null) { |
| throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes)); |
| } |
| return method; |
| } |
| |
| |
| /** |
| * Returns a {@code Constructor} object that reflects the specified |
| * constructor of the class or interface represented by this |
| * {@code Class} object. The {@code parameterTypes} parameter is |
| * an array of {@code Class} objects that identify the constructor's |
| * formal parameter types, in declared order. |
| * |
| * If this {@code Class} object represents an inner class |
| * declared in a non-static context, the formal parameter types |
| * include the explicit enclosing instance as the first parameter. |
| * |
| * @param parameterTypes the parameter array |
| * @return The {@code Constructor} object for the constructor with the |
| * specified parameter list |
| * @exception NoSuchMethodException if a matching method is not found. |
| * @exception SecurityException |
| * If a security manager, <i>s</i>, is present and any of the |
| * following conditions is met: |
| * |
| * <ul> |
| * |
| * <li> invocation of |
| * {@link SecurityManager#checkMemberAccess |
| * s.checkMemberAccess(this, Member.DECLARED)} denies |
| * access to the declared constructor |
| * |
| * <li> the caller's class loader is not the same as or an |
| * ancestor of the class loader for the current class and |
| * invocation of {@link SecurityManager#checkPackageAccess |
| * s.checkPackageAccess()} denies access to the package |
| * of this class |
| * |
| * </ul> |
| * |
| * @since JDK1.1 |
| */ |
| public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) |
| throws NoSuchMethodException, SecurityException { |
| // be very careful not to change the stack depth of this |
| // checkMemberAccess call for security reasons |
| // see java.lang.SecurityManager.checkMemberAccess |
| checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader()); |
| return getConstructor0(parameterTypes, Member.DECLARED); |
| } |
| |
| /** |
| * Finds a resource with a given name. The rules for searching resources |
| * associated with a given class are implemented by the defining |
| * {@linkplain ClassLoader class loader} of the class. This method |
| * delegates to this object's class loader. If this object was loaded by |
| * the bootstrap class loader, the method delegates to {@link |
| * ClassLoader#getSystemResourceAsStream}. |
| * |
| * <p> Before delegation, an absolute resource name is constructed from the |
| * given resource name using this algorithm: |
| * |
| * <ul> |
| * |
| * <li> If the {@code name} begins with a {@code '/'} |
| * (<tt>'\u002f'</tt>), then the absolute name of the resource is the |
| * portion of the {@code name} following the {@code '/'}. |
| * |
| * <li> Otherwise, the absolute name is of the following form: |
| * |
| * <blockquote> |
| * {@code modified_package_name/name} |
| * </blockquote> |
| * |
| * <p> Where the {@code modified_package_name} is the package name of this |
| * object with {@code '/'} substituted for {@code '.'} |
| * (<tt>'\u002e'</tt>). |
| * |
| * </ul> |
| * |
| * @param name name of the desired resource |
| * @return A {@link java.io.InputStream} object or {@code null} if |
| * no resource with this name is found |
| * @throws NullPointerException If {@code name} is {@code null} |
| * @since JDK1.1 |
| */ |
| public InputStream getResourceAsStream(String name) { |
| name = resolveName(name); |
| ClassLoader cl = getClassLoader0(); |
| if (cl==null) { |
| // A system class. |
| return ClassLoader.getSystemResourceAsStream(name); |
| } |
| return cl.getResourceAsStream(name); |
| } |
| |
| /** |
| * Finds a resource with a given name. The rules for searching resources |
| * associated with a given class are implemented by the defining |
| * {@linkplain ClassLoader class loader} of the class. This method |
| * delegates to this object's class loader. If this object was loaded by |
| * the bootstrap class loader, the method delegates to {@link |
| * ClassLoader#getSystemResource}. |
| * |
| * <p> Before delegation, an absolute resource name is constructed from the |
| * given resource name using this algorithm: |
| * |
| * <ul> |
| * |
| * <li> If the {@code name} begins with a {@code '/'} |
| * (<tt>'\u002f'</tt>), then the absolute name of the resource is the |
| * portion of the {@code name} following the {@code '/'}. |
| * |
| * <li> Otherwise, the absolute name is of the following form: |
| * |
| * <blockquote> |
| * {@code modified_package_name/name} |
| * </blockquote> |
| * |
| * <p> Where the {@code modified_package_name} is the package name of this |
| * object with {@code '/'} substituted for {@code '.'} |
| * (<tt>'\u002e'</tt>). |
| * |
| * </ul> |
| * |
| * @param name name of the desired resource |
| * @return A {@link java.net.URL} object or {@code null} if no |
| * resource with this name is found |
| * @since JDK1.1 |
| */ |
| public java.net.URL getResource(String name) { |
| name = resolveName(name); |
| ClassLoader cl = getClassLoader0(); |
| if (cl==null) { |
| // A system class. |
| return ClassLoader.getSystemResource(name); |
| } |
| return cl.getResource(name); |
| } |
| |
| |
| |
| /** protection domain returned when the internal domain is null */ |
| private static java.security.ProtectionDomain allPermDomain; |
| |
| |
| /** |
| * Returns the {@code ProtectionDomain} of this class. If there is a |
| * security manager installed, this method first calls the security |
| * manager's {@code checkPermission} method with a |
| * {@code RuntimePermission("getProtectionDomain")} permission to |
| * ensure it's ok to get the |
| * {@code ProtectionDomain}. |
| * |
| * @return the ProtectionDomain of this class |
| * |
| * @throws SecurityException |
| * if a security manager exists and its |
| * {@code checkPermission} method doesn't allow |
| * getting the ProtectionDomain. |
| * |
| * @see java.security.ProtectionDomain |
| * @see SecurityManager#checkPermission |
| * @see java.lang.RuntimePermission |
| * @since 1.2 |
| */ |
| public java.security.ProtectionDomain getProtectionDomain() { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(SecurityConstants.GET_PD_PERMISSION); |
| } |
| java.security.ProtectionDomain pd = getProtectionDomain0(); |
| if (pd == null) { |
| if (allPermDomain == null) { |
| java.security.Permissions perms = |
| new java.security.Permissions(); |
| perms.add(SecurityConstants.ALL_PERMISSION); |
| allPermDomain = |
| new java.security.ProtectionDomain(null, perms); |
| } |
| pd = allPermDomain; |
| } |
| return pd; |
| } |
| |
| |
| /** |
| * Returns the ProtectionDomain of this class. |
| */ |
| private native java.security.ProtectionDomain getProtectionDomain0(); |
| |
| |
| /** |
| * Set the ProtectionDomain for this class. Called by |
| * ClassLoader.defineClass. |
| */ |
| native void setProtectionDomain0(java.security.ProtectionDomain pd); |
| |
| |
| /* |
| * Return the Virtual Machine's Class object for the named |
| * primitive type. |
| */ |
| static native Class<?> getPrimitiveClass(String name); |
| |
| |
| /* |
| * Check if client is allowed to access members. If access is denied, |
| * throw a SecurityException. |
| * |
| * Be very careful not to change the stack depth of this checkMemberAccess |
| * call for security reasons. |
| * See java.lang.SecurityManager.checkMemberAccess. |
| * |
| * <p> Default policy: allow all clients access with normal Java access |
| * control. |
| */ |
| private void checkMemberAccess(int which, ClassLoader ccl) { |
| SecurityManager s = System.getSecurityManager(); |
| if (s != null) { |
| s.checkMemberAccess(this, which); |
| ClassLoader cl = getClassLoader0(); |
| if ((ccl != null) && (ccl != cl) && |
| ((cl == null) || !cl.isAncestor(ccl))) { |
| String name = this.getName(); |
| int i = name.lastIndexOf('.'); |
| if (i != -1) { |
| s.checkPackageAccess(name.substring(0, i)); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Add a package name prefix if the name is not absolute Remove leading "/" |
| * if name is absolute |
| */ |
| private String resolveName(String name) { |
| if (name == null) { |
| return name; |
| } |
| if (!name.startsWith("/")) { |
| Class<?> c = this; |
| while (c.isArray()) { |
| c = c.getComponentType(); |
| } |
| String baseName = c.getName(); |
| int index = baseName.lastIndexOf('.'); |
| if (index != -1) { |
| name = baseName.substring(0, index).replace('.', '/') |
| +"/"+name; |
| } |
| } else { |
| name = name.substring(1); |
| } |
| return name; |
| } |
| |
| /** |
| * Reflection support. |
| */ |
| |
| // Caches for certain reflective results |
| private static boolean useCaches = true; |
| private volatile transient SoftReference<Field[]> declaredFields; |
| private volatile transient SoftReference<Field[]> publicFields; |
| private volatile transient SoftReference<Method[]> declaredMethods; |
| private volatile transient SoftReference<Method[]> publicMethods; |
| private volatile transient SoftReference<Constructor<T>[]> declaredConstructors; |
| private volatile transient SoftReference<Constructor<T>[]> publicConstructors; |
| // Intermediate results for getFields and getMethods |
| private volatile transient SoftReference<Field[]> declaredPublicFields; |
| private volatile transient SoftReference<Method[]> declaredPublicMethods; |
| |
| // Incremented by the VM on each call to JVM TI RedefineClasses() |
| // that redefines this class or a superclass. |
| private volatile transient int classRedefinedCount = 0; |
| |
| // Value of classRedefinedCount when we last cleared the cached values |
| // that are sensitive to class redefinition. |
| private volatile transient int lastRedefinedCount = 0; |
| |
| // Clears cached values that might possibly have been obsoleted by |
| // a class redefinition. |
| private void clearCachesOnClassRedefinition() { |
| if (lastRedefinedCount != classRedefinedCount) { |
| declaredFields = publicFields = declaredPublicFields = null; |
| declaredMethods = publicMethods = declaredPublicMethods = null; |
| declaredConstructors = publicConstructors = null; |
| annotations = declaredAnnotations = null; |
| |
| // Use of "volatile" (and synchronization by caller in the case |
| // of annotations) ensures that no thread sees the update to |
| // lastRedefinedCount before seeing the caches cleared. |
| // We do not guard against brief windows during which multiple |
| // threads might redundantly work to fill an empty cache. |
| lastRedefinedCount = classRedefinedCount; |
| } |
| } |
| |
| // Generic signature handling |
| private native String getGenericSignature(); |
| |
| // Generic info repository; lazily initialized |
| private transient ClassRepository genericInfo; |
| |
| // accessor for factory |
| private GenericsFactory getFactory() { |
| // create scope and factory |
| return CoreReflectionFactory.make(this, ClassScope.make(this)); |
| } |
| |
| // accessor for generic info repository |
| private ClassRepository getGenericInfo() { |
| // lazily initialize repository if necessary |
| if (genericInfo == null) { |
| // create and cache generic info repository |
| genericInfo = ClassRepository.make(getGenericSignature(), |
| getFactory()); |
| } |
| return genericInfo; //return cached repository |
| } |
| |
| // Annotations handling |
| private native byte[] getRawAnnotations(); |
| |
| native ConstantPool getConstantPool(); |
| |
| // |
| // |
| // java.lang.reflect.Field handling |
| // |
| // |
| |
| // Returns an array of "root" fields. These Field objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyField. |
| private Field[] privateGetDeclaredFields(boolean publicOnly) { |
| checkInitted(); |
| Field[] res = null; |
| if (useCaches) { |
| clearCachesOnClassRedefinition(); |
| if (publicOnly) { |
| if (declaredPublicFields != null) { |
| res = declaredPublicFields.get(); |
| } |
| } else { |
| if (declaredFields != null) { |
| res = declaredFields.get(); |
| } |
| } |
| if (res != null) return res; |
| } |
| // No cached value available; request value from VM |
| res = Reflection.filterFields(this, getDeclaredFields0(publicOnly)); |
| if (useCaches) { |
| if (publicOnly) { |
| declaredPublicFields = new SoftReference<>(res); |
| } else { |
| declaredFields = new SoftReference<>(res); |
| } |
| } |
| return res; |
| } |
| |
| // Returns an array of "root" fields. These Field objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyField. |
| private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) { |
| checkInitted(); |
| Field[] res = null; |
| if (useCaches) { |
| clearCachesOnClassRedefinition(); |
| if (publicFields != null) { |
| res = publicFields.get(); |
| } |
| if (res != null) return res; |
| } |
| |
| // No cached value available; compute value recursively. |
| // Traverse in correct order for getField(). |
| List<Field> fields = new ArrayList<>(); |
| if (traversedInterfaces == null) { |
| traversedInterfaces = new HashSet<>(); |
| } |
| |
| // Local fields |
| Field[] tmp = privateGetDeclaredFields(true); |
| addAll(fields, tmp); |
| |
| // Direct superinterfaces, recursively |
| for (Class<?> c : getInterfaces()) { |
| if (!traversedInterfaces.contains(c)) { |
| traversedInterfaces.add(c); |
| addAll(fields, c.privateGetPublicFields(traversedInterfaces)); |
| } |
| } |
| |
| // Direct superclass, recursively |
| if (!isInterface()) { |
| Class<?> c = getSuperclass(); |
| if (c != null) { |
| addAll(fields, c.privateGetPublicFields(traversedInterfaces)); |
| } |
| } |
| |
| res = new Field[fields.size()]; |
| fields.toArray(res); |
| if (useCaches) { |
| publicFields = new SoftReference<>(res); |
| } |
| return res; |
| } |
| |
| private static void addAll(Collection<Field> c, Field[] o) { |
| for (int i = 0; i < o.length; i++) { |
| c.add(o[i]); |
| } |
| } |
| |
| |
| // |
| // |
| // java.lang.reflect.Constructor handling |
| // |
| // |
| |
| // Returns an array of "root" constructors. These Constructor |
| // objects must NOT be propagated to the outside world, but must |
| // instead be copied via ReflectionFactory.copyConstructor. |
| private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) { |
| checkInitted(); |
| Constructor<T>[] res = null; |
| if (useCaches) { |
| clearCachesOnClassRedefinition(); |
| if (publicOnly) { |
| if (publicConstructors != null) { |
| res = publicConstructors.get(); |
| } |
| } else { |
| if (declaredConstructors != null) { |
| res = declaredConstructors.get(); |
| } |
| } |
| if (res != null) return res; |
| } |
| // No cached value available; request value from VM |
| if (isInterface()) { |
| @SuppressWarnings("unchecked") |
| Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0]; |
| res = temporaryRes; |
| } else { |
| res = getDeclaredConstructors0(publicOnly); |
| } |
| if (useCaches) { |
| if (publicOnly) { |
| publicConstructors = new SoftReference<>(res); |
| } else { |
| declaredConstructors = new SoftReference<>(res); |
| } |
| } |
| return res; |
| } |
| |
| // |
| // |
| // java.lang.reflect.Method handling |
| // |
| // |
| |
| // Returns an array of "root" methods. These Method objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyMethod. |
| private Method[] privateGetDeclaredMethods(boolean publicOnly) { |
| checkInitted(); |
| Method[] res = null; |
| if (useCaches) { |
| clearCachesOnClassRedefinition(); |
| if (publicOnly) { |
| if (declaredPublicMethods != null) { |
| res = declaredPublicMethods.get(); |
| } |
| } else { |
| if (declaredMethods != null) { |
| res = declaredMethods.get(); |
| } |
| } |
| if (res != null) return res; |
| } |
| // No cached value available; request value from VM |
| res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly)); |
| if (useCaches) { |
| if (publicOnly) { |
| declaredPublicMethods = new SoftReference<>(res); |
| } else { |
| declaredMethods = new SoftReference<>(res); |
| } |
| } |
| return res; |
| } |
| |
| static class MethodArray { |
| private Method[] methods; |
| private int length; |
| |
| MethodArray() { |
| methods = new Method[20]; |
| length = 0; |
| } |
| |
| void add(Method m) { |
| if (length == methods.length) { |
| methods = Arrays.copyOf(methods, 2 * methods.length); |
| } |
| methods[length++] = m; |
| } |
| |
| void addAll(Method[] ma) { |
| for (int i = 0; i < ma.length; i++) { |
| add(ma[i]); |
| } |
| } |
| |
| void addAll(MethodArray ma) { |
| for (int i = 0; i < ma.length(); i++) { |
| add(ma.get(i)); |
| } |
| } |
| |
| void addIfNotPresent(Method newMethod) { |
| for (int i = 0; i < length; i++) { |
| Method m = methods[i]; |
| if (m == newMethod || (m != null && m.equals(newMethod))) { |
| return; |
| } |
| } |
| add(newMethod); |
| } |
| |
| void addAllIfNotPresent(MethodArray newMethods) { |
| for (int i = 0; i < newMethods.length(); i++) { |
| Method m = newMethods.get(i); |
| if (m != null) { |
| addIfNotPresent(m); |
| } |
| } |
| } |
| |
| int length() { |
| return length; |
| } |
| |
| Method get(int i) { |
| return methods[i]; |
| } |
| |
| void removeByNameAndSignature(Method toRemove) { |
| for (int i = 0; i < length; i++) { |
| Method m = methods[i]; |
| if (m != null && |
| m.getReturnType() == toRemove.getReturnType() && |
| m.getName() == toRemove.getName() && |
| arrayContentsEq(m.getParameterTypes(), |
| toRemove.getParameterTypes())) { |
| methods[i] = null; |
| } |
| } |
| } |
| |
| void compactAndTrim() { |
| int newPos = 0; |
| // Get rid of null slots |
| for (int pos = 0; pos < length; pos++) { |
| Method m = methods[pos]; |
| if (m != null) { |
| if (pos != newPos) { |
| methods[newPos] = m; |
| } |
| newPos++; |
| } |
| } |
| if (newPos != methods.length) { |
| methods = Arrays.copyOf(methods, newPos); |
| } |
| } |
| |
| Method[] getArray() { |
| return methods; |
| } |
| } |
| |
| |
| // Returns an array of "root" methods. These Method objects must NOT |
| // be propagated to the outside world, but must instead be copied |
| // via ReflectionFactory.copyMethod. |
| private Method[] privateGetPublicMethods() { |
| checkInitted(); |
| Method[] res = null; |
| if (useCaches) { |
| clearCachesOnClassRedefinition(); |
| if (publicMethods != null) { |
| res = publicMethods.get(); |
| } |
| if (res != null) return res; |
| } |
| |
| // No cached value available; compute value recursively. |
| // Start by fetching public declared methods |
| MethodArray methods = new MethodArray(); |
| { |
| Method[] tmp = privateGetDeclaredMethods(true); |
| methods.addAll(tmp); |
| } |
| // Now recur over superclass and direct superinterfaces. |
| // Go over superinterfaces first so we can more easily filter |
| // out concrete implementations inherited from superclasses at |
| // the end. |
| MethodArray inheritedMethods = new MethodArray(); |
| Class<?>[] interfaces = getInterfaces(); |
| for (int i = 0; i < interfaces.length; i++) { |
| inheritedMethods.addAll(interfaces[i].privateGetPublicMethods()); |
| } |
| if (!isInterface()) { |
| Class<?> c = getSuperclass(); |
| if (c != null) { |
| MethodArray supers = new MethodArray(); |
| supers.addAll(c.privateGetPublicMethods()); |
| // Filter out concrete implementations of any |
| // interface methods |
| for (int i = 0; i < supers.length(); i++) { |
| Method m = supers.get(i); |
| if (m != null && !Modifier.isAbstract(m.getModifiers())) { |
| inheritedMethods.removeByNameAndSignature(m); |
| } |
| } |
| // Insert superclass's inherited methods before |
| // superinterfaces' to satisfy getMethod's search |
| // order |
| supers.addAll(inheritedMethods); |
| inheritedMethods = supers; |
| } |
| } |
| // Filter out all local methods from inherited ones |
| for (int i = 0; i < methods.length(); i++) { |
| Method m = methods.get(i); |
| inheritedMethods.removeByNameAndSignature(m); |
| } |
| methods.addAllIfNotPresent(inheritedMethods); |
| methods.compactAndTrim(); |
| res = methods.getArray(); |
| if (useCaches) { |
| publicMethods = new SoftReference<>(res); |
| } |
| return res; |
| } |
| |
| |
| // |
| // Helpers for fetchers of one field, method, or constructor |
| // |
| |
| private Field searchFields(Field[] fields, String name) { |
| String internedName = name.intern(); |
| for (int i = 0; i < fields.length; i++) { |
| if (fields[i].getName() == internedName) { |
| return getReflectionFactory().copyField(fields[i]); |
| } |
| } |
| return null; |
| } |
| |
| private Field getField0(String name) throws NoSuchFieldException { |
| // Note: the intent is that the search algorithm this routine |
| // uses be equivalent to the ordering imposed by |
| // privateGetPublicFields(). It fetches only the declared |
| // public fields for each class, however, to reduce the number |
| // of Field objects which have to be created for the common |
| // case where the field being requested is declared in the |
| // class which is being queried. |
| Field res = null; |
| // Search declared public fields |
| if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) { |
| return res; |
| } |
| // Direct superinterfaces, recursively |
| Class<?>[] interfaces = getInterfaces(); |
| for (int i = 0; i < interfaces.length; i++) { |
| Class<?> c = interfaces[i]; |
| if ((res = c.getField0(name)) != null) { |
| return res; |
| } |
| } |
| // Direct superclass, recursively |
| if (!isInterface()) { |
| Class<?> c = getSuperclass(); |
| if (c != null) { |
| if ((res = c.getField0(name)) != null) { |
| return res; |
| } |
| } |
| } |
| return null; |
| } |
| |
| private static Method searchMethods(Method[] methods, |
| String name, |
| Class<?>[] parameterTypes) |
| { |
| Method res = null; |
| String internedName = name.intern(); |
| for (int i = 0; i < methods.length; i++) { |
| Method m = methods[i]; |
| if (m.getName() == internedName |
| && arrayContentsEq(parameterTypes, m.getParameterTypes()) |
| && (res == null |
| || res.getReturnType().isAssignableFrom(m.getReturnType()))) |
| res = m; |
| } |
| |
| return (res == null ? res : getReflectionFactory().copyMethod(res)); |
| } |
| |
| |
| private Method getMethod0(String name, Class<?>[] parameterTypes) { |
| // Note: the intent is that the search algorithm this routine |
| // uses be equivalent to the ordering imposed by |
| // privateGetPublicMethods(). It fetches only the declared |
| // public methods for each class, however, to reduce the |
| // number of Method objects which have to be created for the |
| // common case where the method being requested is declared in |
| // the class which is being queried. |
| Method res = null; |
| // Search declared public methods |
| if ((res = searchMethods(privateGetDeclaredMethods(true), |
| name, |
| parameterTypes)) != null) { |
| return res; |
| } |
| // Search superclass's methods |
| if (!isInterface()) { |
| Class<? super T> c = getSuperclass(); |
| if (c != null) { |
| if ((res = c.getMethod0(name, parameterTypes)) != null) { |
| return res; |
| } |
| } |
| } |
| // Search superinterfaces' methods |
| Class<?>[] interfaces = getInterfaces(); |
| for (int i = 0; i < interfaces.length; i++) { |
| Class<?> c = interfaces[i]; |
| if ((res = c.getMethod0(name, parameterTypes)) != null) { |
| return res; |
| } |
| } |
| // Not found |
| return null; |
| } |
| |
| private Constructor<T> getConstructor0(Class<?>[] parameterTypes, |
| int which) throws NoSuchMethodException |
| { |
| Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC)); |
| for (Constructor<T> constructor : constructors) { |
| if (arrayContentsEq(parameterTypes, |
| constructor.getParameterTypes())) { |
| return getReflectionFactory().copyConstructor(constructor); |
| } |
| } |
| throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes)); |
| } |
| |
| // |
| // Other helpers and base implementation |
| // |
| |
| private static boolean arrayContentsEq(Object[] a1, Object[] a2) { |
| if (a1 == null) { |
| return a2 == null || a2.length == 0; |
| } |
| |
| if (a2 == null) { |
| return a1.length == 0; |
| } |
| |
| if (a1.length != a2.length) { |
| return false; |
| } |
| |
| for (int i = 0; i < a1.length; i++) { |
| if (a1[i] != a2[i]) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| private static Field[] copyFields(Field[] arg) { |
| Field[] out = new Field[arg.length]; |
| ReflectionFactory fact = getReflectionFactory(); |
| for (int i = 0; i < arg.length; i++) { |
| out[i] = fact.copyField(arg[i]); |
| } |
| return out; |
| } |
| |
| private static Method[] copyMethods(Method[] arg) { |
| Method[] out = new Method[arg.length]; |
| ReflectionFactory fact = getReflectionFactory(); |
| for (int i = 0; i < arg.length; i++) { |
| out[i] = fact.copyMethod(arg[i]); |
| } |
| return out; |
| } |
| |
| private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) { |
| Constructor<U>[] out = arg.clone(); |
| ReflectionFactory fact = getReflectionFactory(); |
| for (int i = 0; i < out.length; i++) { |
| out[i] = fact.copyConstructor(out[i]); |
| } |
| return out; |
| } |
| |
| private native Field[] getDeclaredFields0(boolean publicOnly); |
| private native Method[] getDeclaredMethods0(boolean publicOnly); |
| private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly); |
| private native Class<?>[] getDeclaredClasses0(); |
| |
| private static String argumentTypesToString(Class<?>[] argTypes) { |
| StringBuilder buf = new StringBuilder(); |
| buf.append("("); |
| if (argTypes != null) { |
| for (int i = 0; i < argTypes.length; i++) { |
| if (i > 0) { |
| buf.append(", "); |
| } |
| Class<?> c = argTypes[i]; |
| buf.append((c == null) ? "null" : c.getName()); |
| } |
| } |
| buf.append(")"); |
| return buf.toString(); |
| } |
| |
| /** use serialVersionUID from JDK 1.1 for interoperability */ |
| private static final long serialVersionUID = 3206093459760846163L; |
| |
| |
| /** |
| * Class Class is special cased within the Serialization Stream Protocol. |
| * |
| * A Class instance is written initially into an ObjectOutputStream in the |
| * following format: |
| * <pre> |
| * {@code TC_CLASS} ClassDescriptor |
| * A ClassDescriptor is a special cased serialization of |
| * a {@code java.io.ObjectStreamClass} instance. |
| * </pre> |
| * A new handle is generated for the initial time the class descriptor |
| * is written into the stream. Future references to the class descriptor |
| * are written as references to the initial class descriptor instance. |
| * |
| * @see java.io.ObjectStreamClass |
| */ |
| private static final ObjectStreamField[] serialPersistentFields = |
| new ObjectStreamField[0]; |
| |
| |
| /** |
| * Returns the assertion status that would be assigned to this |
| * class if it were to be initialized at the time this method is invoked. |
| * If this class has had its assertion status set, the most recent |
| * setting will be returned; otherwise, if any package default assertion |
| * status pertains to this class, the most recent setting for the most |
| * specific pertinent package default assertion status is returned; |
| * otherwise, if this class is not a system class (i.e., it has a |
| * class loader) its class loader's default assertion status is returned; |
| * otherwise, the system class default assertion status is returned. |
| * <p> |
| * Few programmers will have any need for this method; it is provided |
| * for the benefit of the JRE itself. (It allows a class to determine at |
| * the time that it is initialized whether assertions should be enabled.) |
| * Note that this method is not guaranteed to return the actual |
| * assertion status that was (or will be) associated with the specified |
| * class when it was (or will be) initialized. |
| * |
| * @return the desired assertion status of the specified class. |
| * @see java.lang.ClassLoader#setClassAssertionStatus |
| * @see java.lang.ClassLoader#setPackageAssertionStatus |
| * @see java.lang.ClassLoader#setDefaultAssertionStatus |
| * @since 1.4 |
| */ |
| public boolean desiredAssertionStatus() { |
| ClassLoader loader = getClassLoader(); |
| // If the loader is null this is a system class, so ask the VM |
| if (loader == null) |
| return desiredAssertionStatus0(this); |
| |
| // If the classloader has been initialized with the assertion |
| // directives, ask it. Otherwise, ask the VM. |
| synchronized(loader.assertionLock) { |
| if (loader.classAssertionStatus != null) { |
| return loader.desiredAssertionStatus(getName()); |
| } |
| } |
| return desiredAssertionStatus0(this); |
| } |
| |
| // Retrieves the desired assertion status of this class from the VM |
| private static native boolean desiredAssertionStatus0(Class<?> clazz); |
| |
| /** |
| * Returns true if and only if this class was declared as an enum in the |
| * source code. |
| * |
| * @return true if and only if this class was declared as an enum in the |
| * source code |
| * @since 1.5 |
| */ |
| public boolean isEnum() { |
| // An enum must both directly extend java.lang.Enum and have |
| // the ENUM bit set; classes for specialized enum constants |
| // don't do the former. |
| return (this.getModifiers() & ENUM) != 0 && |
| this.getSuperclass() == java.lang.Enum.class; |
| } |
| |
| // Fetches the factory for reflective objects |
| private static ReflectionFactory getReflectionFactory() { |
| if (reflectionFactory == null) { |
| reflectionFactory = |
| java.security.AccessController.doPrivileged |
| (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction()); |
| } |
| return reflectionFactory; |
| } |
| private static ReflectionFactory reflectionFactory; |
| |
| // To be able to query system properties as soon as they're available |
| private static boolean initted = false; |
| private static void checkInitted() { |
| if (initted) return; |
| AccessController.doPrivileged(new PrivilegedAction<Void>() { |
| public Void run() { |
| // Tests to ensure the system properties table is fully |
| // initialized. This is needed because reflection code is |
| // called very early in the initialization process (before |
| // command-line arguments have been parsed and therefore |
| // these user-settable properties installed.) We assume that |
| // if System.out is non-null then the System class has been |
| // fully initialized and that the bulk of the startup code |
| // has been run. |
| |
| if (System.out == null) { |
| // java.lang.System not yet fully initialized |
| return null; |
| } |
| |
| // Doesn't use Boolean.getBoolean to avoid class init. |
| String val = |
| System.getProperty("sun.reflect.noCaches"); |
| if (val != null && val.equals("true")) { |
| useCaches = false; |
| } |
| |
| initted = true; |
| return null; |
| } |
| }); |
| } |
| |
| /** |
| * Returns the elements of this enum class or null if this |
| * Class object does not represent an enum type. |
| * |
| * @return an array containing the values comprising the enum class |
| * represented by this Class object in the order they're |
| * declared, or null if this Class object does not |
| * represent an enum type |
| * @since 1.5 |
| */ |
| public T[] getEnumConstants() { |
| T[] values = getEnumConstantsShared(); |
| return (values != null) ? values.clone() : null; |
| } |
| |
| /** |
| * Returns the elements of this enum class or null if this |
| * Class object does not represent an enum type; |
| * identical to getEnumConstants except that the result is |
| * uncloned, cached, and shared by all callers. |
| */ |
| T[] getEnumConstantsShared() { |
| if (enumConstants == null) { |
| if (!isEnum()) return null; |
| try { |
| final Method values = getMethod("values"); |
| java.security.AccessController.doPrivileged( |
| new java.security.PrivilegedAction<Void>() { |
| public Void run() { |
| values.setAccessible(true); |
| return null; |
| } |
| }); |
| @SuppressWarnings("unchecked") |
| T[] temporaryConstants = (T[])values.invoke(null); |
| enumConstants = temporaryConstants; |
| } |
| // These can happen when users concoct enum-like classes |
| // that don't comply with the enum spec. |
| catch (InvocationTargetException | NoSuchMethodException | |
| IllegalAccessException ex) { return null; } |
| } |
| return enumConstants; |
| } |
| private volatile transient T[] enumConstants = null; |
| |
| /** |
| * Returns a map from simple name to enum constant. This package-private |
| * method is used internally by Enum to implement |
| * public static <T extends Enum<T>> T valueOf(Class<T>, String) |
| * efficiently. Note that the map is returned by this method is |
| * created lazily on first use. Typically it won't ever get created. |
| */ |
| Map<String, T> enumConstantDirectory() { |
| if (enumConstantDirectory == null) { |
| T[] universe = getEnumConstantsShared(); |
| if (universe == null) |
| throw new IllegalArgumentException( |
| getName() + " is not an enum type"); |
| Map<String, T> m = new HashMap<>(2 * universe.length); |
| for (T constant : universe) |
| m.put(((Enum<?>)constant).name(), constant); |
| enumConstantDirectory = m; |
| } |
| return enumConstantDirectory; |
| } |
| private volatile transient Map<String, T> enumConstantDirectory = null; |
| |
| /** |
| * Casts an object to the class or interface represented |
| * by this {@code Class} object. |
| * |
| * @param obj the object to be cast |
| * @return the object after casting, or null if obj is null |
| * |
| * @throws ClassCastException if the object is not |
| * null and is not assignable to the type T. |
| * |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| public T cast(Object obj) { |
| if (obj != null && !isInstance(obj)) |
| throw new ClassCastException(cannotCastMsg(obj)); |
| return (T) obj; |
| } |
| |
| private String cannotCastMsg(Object obj) { |
| return "Cannot cast " + obj.getClass().getName() + " to " + getName(); |
| } |
| |
| /** |
| * Casts this {@code Class} object to represent a subclass of the class |
| * represented by the specified class object. Checks that the cast |
| * is valid, and throws a {@code ClassCastException} if it is not. If |
| * this method succeeds, it always returns a reference to this class object. |
| * |
| * <p>This method is useful when a client needs to "narrow" the type of |
| * a {@code Class} object to pass it to an API that restricts the |
| * {@code Class} objects that it is willing to accept. A cast would |
| * generate a compile-time warning, as the correctness of the cast |
| * could not be checked at runtime (because generic types are implemented |
| * by erasure). |
| * |
| * @return this {@code Class} object, cast to represent a subclass of |
| * the specified class object. |
| * @throws ClassCastException if this {@code Class} object does not |
| * represent a subclass of the specified class (here "subclass" includes |
| * the class itself). |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| public <U> Class<? extends U> asSubclass(Class<U> clazz) { |
| if (clazz.isAssignableFrom(this)) |
| return (Class<? extends U>) this; |
| else |
| throw new ClassCastException(this.toString()); |
| } |
| |
| /** |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.5 |
| */ |
| @SuppressWarnings("unchecked") |
| public <A extends Annotation> A getAnnotation(Class<A> annotationClass) { |
| if (annotationClass == null) |
| throw new NullPointerException(); |
| |
| initAnnotationsIfNecessary(); |
| return (A) annotations.get(annotationClass); |
| } |
| |
| /** |
| * @throws NullPointerException {@inheritDoc} |
| * @since 1.5 |
| */ |
| public boolean isAnnotationPresent( |
| Class<? extends Annotation> annotationClass) { |
| if (annotationClass == null) |
| throw new NullPointerException(); |
| |
| return getAnnotation(annotationClass) != null; |
| } |
| |
| |
| /** |
| * @since 1.5 |
| */ |
| public Annotation[] getAnnotations() { |
| initAnnotationsIfNecessary(); |
| return AnnotationParser.toArray(annotations); |
| } |
| |
| /** |
| * @since 1.5 |
| */ |
| public Annotation[] getDeclaredAnnotations() { |
| initAnnotationsIfNecessary(); |
| return AnnotationParser.toArray(declaredAnnotations); |
| } |
| |
| // Annotations cache |
| private transient Map<Class<? extends Annotation>, Annotation> annotations; |
| private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations; |
| |
| private synchronized void initAnnotationsIfNecessary() { |
| clearCachesOnClassRedefinition(); |
| if (annotations != null) |
| return; |
| declaredAnnotations = AnnotationParser.parseAnnotations( |
| getRawAnnotations(), getConstantPool(), this); |
| Class<?> superClass = getSuperclass(); |
| if (superClass == null) { |
| annotations = declaredAnnotations; |
| } else { |
| annotations = new HashMap<>(); |
| superClass.initAnnotationsIfNecessary(); |
| for (Map.Entry<Class<? extends Annotation>, Annotation> e : superClass.annotations.entrySet()) { |
| Class<? extends Annotation> annotationClass = e.getKey(); |
| if (AnnotationType.getInstance(annotationClass).isInherited()) |
| annotations.put(annotationClass, e.getValue()); |
| } |
| annotations.putAll(declaredAnnotations); |
| } |
| } |
| |
| // Annotation types cache their internal (AnnotationType) form |
| |
| private AnnotationType annotationType; |
| |
| void setAnnotationType(AnnotationType type) { |
| annotationType = type; |
| } |
| |
| AnnotationType getAnnotationType() { |
| return annotationType; |
| } |
| |
| /* Backing store of user-defined values pertaining to this class. |
| * Maintained by the ClassValue class. |
| */ |
| transient ClassValue.ClassValueMap classValueMap; |
| } |