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1800 lines
61 KiB
Java
1800 lines
61 KiB
Java
/* Class.java -- Representation of a Java class.
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Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007
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Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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import gnu.classpath.VMStackWalker;
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import gnu.java.lang.reflect.ClassSignatureParser;
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import java.io.InputStream;
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import java.io.Serializable;
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import java.lang.annotation.Annotation;
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import java.lang.annotation.Inherited;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.AnnotatedElement;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.GenericDeclaration;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Member;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.lang.reflect.Type;
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import java.lang.reflect.TypeVariable;
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import java.net.URL;
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import java.security.AccessController;
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import java.security.AllPermission;
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import java.security.Permissions;
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import java.security.PrivilegedAction;
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import java.security.ProtectionDomain;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.LinkedHashSet;
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/**
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* A Class represents a Java type. There will never be multiple Class
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* objects with identical names and ClassLoaders. Primitive types, array
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* types, and void also have a Class object.
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*
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* <p>Arrays with identical type and number of dimensions share the same class.
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* The array class ClassLoader is the same as the ClassLoader of the element
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* type of the array (which can be null to indicate the bootstrap classloader).
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* The name of an array class is <code>[<signature format>;</code>.
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* <p> For example,
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* String[]'s class is <code>[Ljava.lang.String;</code>. boolean, byte,
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* short, char, int, long, float and double have the "type name" of
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* Z,B,S,C,I,J,F,D for the purposes of array classes. If it's a
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* multidimensioned array, the same principle applies:
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* <code>int[][][]</code> == <code>[[[I</code>.
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*
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* <p>There is no public constructor - Class objects are obtained only through
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* the virtual machine, as defined in ClassLoaders.
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*
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* @serialData Class objects serialize specially:
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* <code>TC_CLASS ClassDescriptor</code>. For more serialization information,
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* see {@link ObjectStreamClass}.
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*
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* @author John Keiser
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* @author Eric Blake (ebb9@email.byu.edu)
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* @author Tom Tromey (tromey@redhat.com)
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.0
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* @see ClassLoader
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*/
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public final class Class<T>
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implements Serializable, Type, AnnotatedElement, GenericDeclaration
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{
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/**
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* Compatible with JDK 1.0+.
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*/
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private static final long serialVersionUID = 3206093459760846163L;
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/**
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* Flag indicating a synthetic member.
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* Note that this duplicates a constant in Modifier.
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*/
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private static final int SYNTHETIC = 0x1000;
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/**
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* Flag indiciating an annotation class.
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*/
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private static final int ANNOTATION = 0x2000;
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/**
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* Flag indicating an enum constant or an enum class.
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* Note that this duplicates a constant in Modifier.
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*/
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private static final int ENUM = 0x4000;
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/** The class signers. */
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private Object[] signers = null;
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/** The class protection domain. */
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private final transient ProtectionDomain pd;
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/* We use an inner class, so that Class doesn't have a static initializer */
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private static final class StaticData
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{
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static final ProtectionDomain unknownProtectionDomain;
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static
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{
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Permissions permissions = new Permissions();
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permissions.add(new AllPermission());
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unknownProtectionDomain = new ProtectionDomain(null, permissions);
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}
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}
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final transient Object vmdata;
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/** newInstance() caches the default constructor */
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private transient Constructor<T> constructor;
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/**
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* Class is non-instantiable from Java code; only the VM can create
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* instances of this class.
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*/
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Class(Object vmdata)
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{
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this(vmdata, null);
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}
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Class(Object vmdata, ProtectionDomain pd)
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{
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this.vmdata = vmdata;
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// If the VM didn't supply a protection domain and the class is an array,
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// we "inherit" the protection domain from the component type class. This
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// saves the VM from having to worry about protection domains for array
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// classes.
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if (pd == null && isArray())
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this.pd = getComponentType().pd;
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else
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this.pd = pd;
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}
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/**
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* Use the classloader of the current class to load, link, and initialize
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* a class. This is equivalent to your code calling
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* <code>Class.forName(name, true, getClass().getClassLoader())</code>.
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*
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* @param name the name of the class to find
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* @return the Class object representing the class
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* @throws ClassNotFoundException if the class was not found by the
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* classloader
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* @throws LinkageError if linking the class fails
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* @throws ExceptionInInitializerError if the class loads, but an exception
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* occurs during initialization
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*/
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public static Class<?> forName(String name) throws ClassNotFoundException
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{
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return VMClass.forName(name, true, VMStackWalker.getCallingClassLoader());
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}
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/**
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* Use the specified classloader to load and link a class. If the loader
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* is null, this uses the bootstrap class loader (provide the security
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* check succeeds). Unfortunately, this method cannot be used to obtain
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* the Class objects for primitive types or for void, you have to use
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* the fields in the appropriate java.lang wrapper classes.
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*
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* <p>Calls <code>classloader.loadclass(name, initialize)</code>.
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*
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* @param name the name of the class to find
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* @param initialize whether or not to initialize the class at this time
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* @param classloader the classloader to use to find the class; null means
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* to use the bootstrap class loader
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*
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* @return the class object for the given class
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*
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* @throws ClassNotFoundException if the class was not found by the
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* classloader
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* @throws LinkageError if linking the class fails
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* @throws ExceptionInInitializerError if the class loads, but an exception
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* occurs during initialization
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* @throws SecurityException if the <code>classloader</code> argument
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* is <code>null</code> and the caller does not have the
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* <code>RuntimePermission("getClassLoader")</code> permission
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* @see ClassLoader
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* @since 1.2
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*/
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public static Class<?> forName(String name, boolean initialize,
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ClassLoader classloader)
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throws ClassNotFoundException
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{
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if (classloader == null)
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{
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// Check if we may access the bootstrap classloader
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SecurityManager sm = SecurityManager.current;
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if (sm != null)
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{
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// Get the calling classloader
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ClassLoader cl = VMStackWalker.getCallingClassLoader();
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if (cl != null)
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sm.checkPermission(new RuntimePermission("getClassLoader"));
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}
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}
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return (Class<?>) VMClass.forName(name, initialize, classloader);
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}
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/**
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* Get all the public member classes and interfaces declared in this
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* class or inherited from superclasses. This returns an array of length
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* 0 if there are no member classes, including for primitive types. A
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* security check may be performed, with
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* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
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* <code>checkPackageAccess</code> both having to succeed.
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*
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* @return all public member classes in this class
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* @throws SecurityException if the security check fails
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* @since 1.1
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*/
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public Class<?>[] getClasses()
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{
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memberAccessCheck(Member.PUBLIC);
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return internalGetClasses();
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}
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/**
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* Like <code>getClasses()</code> but without the security checks.
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*/
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private Class<?>[] internalGetClasses()
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{
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ArrayList<Class> list = new ArrayList<Class>();
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list.addAll(Arrays.asList(getDeclaredClasses(true)));
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Class superClass = getSuperclass();
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if (superClass != null)
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list.addAll(Arrays.asList(superClass.internalGetClasses()));
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return list.toArray(new Class<?>[list.size()]);
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}
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/**
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* Get the ClassLoader that loaded this class. If the class was loaded
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* by the bootstrap classloader, this method will return null.
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* If there is a security manager, and the caller's class loader is not
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* an ancestor of the requested one, a security check of
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* <code>RuntimePermission("getClassLoader")</code>
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* must first succeed. Primitive types and void return null.
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*
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* @return the ClassLoader that loaded this class
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* @throws SecurityException if the security check fails
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* @see ClassLoader
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* @see RuntimePermission
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*/
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public ClassLoader getClassLoader()
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{
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if (isPrimitive())
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return null;
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ClassLoader loader = VMClass.getClassLoader(this);
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// Check if we may get the classloader
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SecurityManager sm = SecurityManager.current;
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if (loader != null && sm != null)
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{
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// Get the calling classloader
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ClassLoader cl = VMStackWalker.getCallingClassLoader();
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if (cl != null && !cl.isAncestorOf(loader))
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sm.checkPermission(new RuntimePermission("getClassLoader"));
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}
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return loader;
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}
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/**
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* If this is an array, get the Class representing the type of array.
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* Examples: "[[Ljava.lang.String;" would return "[Ljava.lang.String;", and
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* calling getComponentType on that would give "java.lang.String". If
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* this is not an array, returns null.
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*
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* @return the array type of this class, or null
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* @see Array
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* @since 1.1
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*/
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public Class<?> getComponentType()
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{
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return VMClass.getComponentType (this);
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}
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/**
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* Get a public constructor declared in this class. If the constructor takes
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* no argument, an array of zero elements and null are equivalent for the
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* types argument. A security check may be performed, with
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* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
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* <code>checkPackageAccess</code> both having to succeed.
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*
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* @param types the type of each parameter
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* @return the constructor
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* @throws NoSuchMethodException if the constructor does not exist
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* @throws SecurityException if the security check fails
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* @see #getConstructors()
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* @since 1.1
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*/
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public Constructor<T> getConstructor(Class<?>... types)
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throws NoSuchMethodException
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{
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memberAccessCheck(Member.PUBLIC);
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Constructor[] constructors = getDeclaredConstructors(true);
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for (int i = 0; i < constructors.length; i++)
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{
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Constructor constructor = constructors[i];
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if (matchParameters(types, constructor.getParameterTypes()))
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return constructor;
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}
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throw new NoSuchMethodException();
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}
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/**
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* Get all the public constructors of this class. This returns an array of
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* length 0 if there are no constructors, including for primitive types,
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* arrays, and interfaces. It does, however, include the default
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* constructor if one was supplied by the compiler. A security check may
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* be performed, with <code>checkMemberAccess(this, Member.PUBLIC)</code>
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* as well as <code>checkPackageAccess</code> both having to succeed.
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*
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* @return all public constructors in this class
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* @throws SecurityException if the security check fails
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* @since 1.1
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*/
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public Constructor<?>[] getConstructors()
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{
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memberAccessCheck(Member.PUBLIC);
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return getDeclaredConstructors(true);
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}
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/**
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* Get a constructor declared in this class. If the constructor takes no
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* argument, an array of zero elements and null are equivalent for the
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* types argument. A security check may be performed, with
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* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
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* <code>checkPackageAccess</code> both having to succeed.
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*
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* @param types the type of each parameter
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* @return the constructor
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* @throws NoSuchMethodException if the constructor does not exist
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* @throws SecurityException if the security check fails
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* @see #getDeclaredConstructors()
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* @since 1.1
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*/
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public Constructor<T> getDeclaredConstructor(Class<?>... types)
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throws NoSuchMethodException
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{
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memberAccessCheck(Member.DECLARED);
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Constructor[] constructors = getDeclaredConstructors(false);
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for (int i = 0; i < constructors.length; i++)
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{
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Constructor constructor = constructors[i];
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if (matchParameters(types, constructor.getParameterTypes()))
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return constructor;
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}
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throw new NoSuchMethodException();
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}
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/**
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* Get all the declared member classes and interfaces in this class, but
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* not those inherited from superclasses. This returns an array of length
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* 0 if there are no member classes, including for primitive types. A
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* security check may be performed, with
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* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
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* <code>checkPackageAccess</code> both having to succeed.
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*
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* @return all declared member classes in this class
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* @throws SecurityException if the security check fails
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* @since 1.1
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*/
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public Class<?>[] getDeclaredClasses()
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{
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memberAccessCheck(Member.DECLARED);
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return getDeclaredClasses(false);
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}
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Class<?>[] getDeclaredClasses (boolean publicOnly)
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{
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return VMClass.getDeclaredClasses (this, publicOnly);
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}
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/**
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* Get all the declared constructors of this class. This returns an array of
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* length 0 if there are no constructors, including for primitive types,
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* arrays, and interfaces. It does, however, include the default
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* constructor if one was supplied by the compiler. A security check may
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* be performed, with <code>checkMemberAccess(this, Member.DECLARED)</code>
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* as well as <code>checkPackageAccess</code> both having to succeed.
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*
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* @return all constructors in this class
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* @throws SecurityException if the security check fails
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* @since 1.1
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*/
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public Constructor<?>[] getDeclaredConstructors()
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{
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memberAccessCheck(Member.DECLARED);
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return getDeclaredConstructors(false);
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}
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Constructor<?>[] getDeclaredConstructors (boolean publicOnly)
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{
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return VMClass.getDeclaredConstructors (this, publicOnly);
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}
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/**
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* Get a field declared in this class, where name is its simple name. The
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* implicit length field of arrays is not available. A security check may
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* be performed, with <code>checkMemberAccess(this, Member.DECLARED)</code>
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* as well as <code>checkPackageAccess</code> both having to succeed.
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*
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* @param name the name of the field
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* @return the field
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* @throws NoSuchFieldException if the field does not exist
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* @throws SecurityException if the security check fails
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* @see #getDeclaredFields()
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* @since 1.1
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*/
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public Field getDeclaredField(String name) throws NoSuchFieldException
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{
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memberAccessCheck(Member.DECLARED);
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Field[] fields = getDeclaredFields(false);
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for (int i = 0; i < fields.length; i++)
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{
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if (fields[i].getName().equals(name))
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return fields[i];
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}
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throw new NoSuchFieldException();
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}
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/**
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* Get all the declared fields in this class, but not those inherited from
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* superclasses. This returns an array of length 0 if there are no fields,
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* including for primitive types. This does not return the implicit length
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* field of arrays. A security check may be performed, with
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* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
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* <code>checkPackageAccess</code> both having to succeed.
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*
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* @return all declared fields in this class
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* @throws SecurityException if the security check fails
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* @since 1.1
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*/
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public Field[] getDeclaredFields()
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{
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memberAccessCheck(Member.DECLARED);
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return getDeclaredFields(false);
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}
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Field[] getDeclaredFields (boolean publicOnly)
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{
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return VMClass.getDeclaredFields (this, publicOnly);
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}
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/**
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* Get a method declared in this class, where name is its simple name. The
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* implicit methods of Object are not available from arrays or interfaces.
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* Constructors (named "<init>" in the class file) and class initializers
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* (name "<clinit>") are not available. The Virtual Machine allows
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* multiple methods with the same signature but differing return types; in
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* such a case the most specific return types are favored, then the final
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* choice is arbitrary. If the method takes no argument, an array of zero
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* elements and null are equivalent for the types argument. A security
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* check may be performed, with
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* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
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* <code>checkPackageAccess</code> both having to succeed.
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*
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* @param methodName the name of the method
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* @param types the type of each parameter
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* @return the method
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* @throws NoSuchMethodException if the method does not exist
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* @throws SecurityException if the security check fails
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* @see #getDeclaredMethods()
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* @since 1.1
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*/
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public Method getDeclaredMethod(String methodName, Class<?>... types)
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throws NoSuchMethodException
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{
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memberAccessCheck(Member.DECLARED);
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Method match = matchMethod(getDeclaredMethods(false), methodName, types);
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if (match == null)
|
|
throw new NoSuchMethodException(methodName);
|
|
return match;
|
|
}
|
|
|
|
/**
|
|
* Get all the declared methods in this class, but not those inherited from
|
|
* superclasses. This returns an array of length 0 if there are no methods,
|
|
* including for primitive types. This does include the implicit methods of
|
|
* arrays and interfaces which mirror methods of Object, nor does it
|
|
* include constructors or the class initialization methods. The Virtual
|
|
* Machine allows multiple methods with the same signature but differing
|
|
* return types; all such methods are in the returned array. A security
|
|
* check may be performed, with
|
|
* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
|
*
|
|
* @return all declared methods in this class
|
|
* @throws SecurityException if the security check fails
|
|
* @since 1.1
|
|
*/
|
|
public Method[] getDeclaredMethods()
|
|
{
|
|
memberAccessCheck(Member.DECLARED);
|
|
return getDeclaredMethods(false);
|
|
}
|
|
|
|
Method[] getDeclaredMethods (boolean publicOnly)
|
|
{
|
|
return VMClass.getDeclaredMethods (this, publicOnly);
|
|
}
|
|
|
|
/**
|
|
* If this is a nested or inner class, return the class that declared it.
|
|
* If not, return null.
|
|
*
|
|
* @return the declaring class of this class
|
|
* @since 1.1
|
|
*/
|
|
public Class<?> getDeclaringClass()
|
|
{
|
|
return VMClass.getDeclaringClass (this);
|
|
}
|
|
|
|
/**
|
|
* Get a public field declared or inherited in this class, where name is
|
|
* its simple name. If the class contains multiple accessible fields by
|
|
* that name, an arbitrary one is returned. The implicit length field of
|
|
* arrays is not available. A security check may be performed, with
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
|
*
|
|
* @param fieldName the name of the field
|
|
* @return the field
|
|
* @throws NoSuchFieldException if the field does not exist
|
|
* @throws SecurityException if the security check fails
|
|
* @see #getFields()
|
|
* @since 1.1
|
|
*/
|
|
public Field getField(String fieldName)
|
|
throws NoSuchFieldException
|
|
{
|
|
memberAccessCheck(Member.PUBLIC);
|
|
Field field = internalGetField(fieldName);
|
|
if (field == null)
|
|
throw new NoSuchFieldException(fieldName);
|
|
return field;
|
|
}
|
|
|
|
/**
|
|
* Get all the public fields declared in this class or inherited from
|
|
* superclasses. This returns an array of length 0 if there are no fields,
|
|
* including for primitive types. This does not return the implicit length
|
|
* field of arrays. A security check may be performed, with
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
|
*
|
|
* @return all public fields in this class
|
|
* @throws SecurityException if the security check fails
|
|
* @since 1.1
|
|
*/
|
|
public Field[] getFields()
|
|
{
|
|
memberAccessCheck(Member.PUBLIC);
|
|
return internalGetFields();
|
|
}
|
|
|
|
/**
|
|
* Like <code>getFields()</code> but without the security checks.
|
|
*/
|
|
private Field[] internalGetFields()
|
|
{
|
|
LinkedHashSet<Field> set = new LinkedHashSet<Field>();
|
|
set.addAll(Arrays.asList(getDeclaredFields(true)));
|
|
Class[] interfaces = getInterfaces();
|
|
for (int i = 0; i < interfaces.length; i++)
|
|
set.addAll(Arrays.asList(interfaces[i].internalGetFields()));
|
|
Class superClass = getSuperclass();
|
|
if (superClass != null)
|
|
set.addAll(Arrays.asList(superClass.internalGetFields()));
|
|
return set.toArray(new Field[set.size()]);
|
|
}
|
|
|
|
/**
|
|
* Returns the <code>Package</code> in which this class is defined
|
|
* Returns null when this information is not available from the
|
|
* classloader of this class.
|
|
*
|
|
* @return the package for this class, if it is available
|
|
* @since 1.2
|
|
*/
|
|
public Package getPackage()
|
|
{
|
|
ClassLoader cl = getClassLoader();
|
|
if (cl != null)
|
|
return cl.getPackage(getPackagePortion(getName()));
|
|
else
|
|
return VMClassLoader.getPackage(getPackagePortion(getName()));
|
|
}
|
|
|
|
/**
|
|
* Get the interfaces this class <em>directly</em> implements, in the
|
|
* order that they were declared. This returns an empty array, not null,
|
|
* for Object, primitives, void, and classes or interfaces with no direct
|
|
* superinterface. Array types return Cloneable and Serializable.
|
|
*
|
|
* @return the interfaces this class directly implements
|
|
*/
|
|
public Class<?>[] getInterfaces()
|
|
{
|
|
return VMClass.getInterfaces (this);
|
|
}
|
|
|
|
private static final class MethodKey
|
|
{
|
|
private String name;
|
|
private Class[] params;
|
|
private Class returnType;
|
|
private int hash;
|
|
|
|
MethodKey(Method m)
|
|
{
|
|
name = m.getName();
|
|
params = m.getParameterTypes();
|
|
returnType = m.getReturnType();
|
|
hash = name.hashCode() ^ returnType.hashCode();
|
|
for(int i = 0; i < params.length; i++)
|
|
{
|
|
hash ^= params[i].hashCode();
|
|
}
|
|
}
|
|
|
|
public boolean equals(Object o)
|
|
{
|
|
if (o instanceof MethodKey)
|
|
{
|
|
MethodKey m = (MethodKey) o;
|
|
if (m.name.equals(name) && m.params.length == params.length
|
|
&& m.returnType == returnType)
|
|
{
|
|
for (int i = 0; i < params.length; i++)
|
|
{
|
|
if (m.params[i] != params[i])
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public int hashCode()
|
|
{
|
|
return hash;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get a public method declared or inherited in this class, where name is
|
|
* its simple name. The implicit methods of Object are not available from
|
|
* interfaces. Constructors (named "<init>" in the class file) and class
|
|
* initializers (name "<clinit>") are not available. The Virtual
|
|
* Machine allows multiple methods with the same signature but differing
|
|
* return types, and the class can inherit multiple methods of the same
|
|
* return type; in such a case the most specific return types are favored,
|
|
* then the final choice is arbitrary. If the method takes no argument, an
|
|
* array of zero elements and null are equivalent for the types argument.
|
|
* A security check may be performed, with
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
|
*
|
|
* @param methodName the name of the method
|
|
* @param types the type of each parameter
|
|
* @return the method
|
|
* @throws NoSuchMethodException if the method does not exist
|
|
* @throws SecurityException if the security check fails
|
|
* @see #getMethods()
|
|
* @since 1.1
|
|
*/
|
|
public Method getMethod(String methodName, Class<?>... types)
|
|
throws NoSuchMethodException
|
|
{
|
|
memberAccessCheck(Member.PUBLIC);
|
|
Method method = internalGetMethod(methodName, types);
|
|
if (method == null)
|
|
throw new NoSuchMethodException(methodName);
|
|
return method;
|
|
}
|
|
|
|
/**
|
|
* Like <code>getMethod(String,Class[])</code> but without the security
|
|
* checks and returns null instead of throwing NoSuchMethodException.
|
|
*/
|
|
private Method internalGetMethod(String methodName, Class[] args)
|
|
{
|
|
Method match = matchMethod(getDeclaredMethods(true), methodName, args);
|
|
if (match != null)
|
|
return match;
|
|
Class superClass = getSuperclass();
|
|
if (superClass != null)
|
|
{
|
|
match = superClass.internalGetMethod(methodName, args);
|
|
if(match != null)
|
|
return match;
|
|
}
|
|
Class[] interfaces = getInterfaces();
|
|
for (int i = 0; i < interfaces.length; i++)
|
|
{
|
|
match = interfaces[i].internalGetMethod(methodName, args);
|
|
if (match != null)
|
|
return match;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Find the best matching method in <code>list</code> according to
|
|
* the definition of ``best matching'' used by <code>getMethod()</code>
|
|
*
|
|
* <p>
|
|
* Returns the method if any, otherwise <code>null</code>.
|
|
*
|
|
* @param list List of methods to search
|
|
* @param name Name of method
|
|
* @param args Method parameter types
|
|
* @see #getMethod(String, Class[])
|
|
*/
|
|
private static Method matchMethod(Method[] list, String name, Class[] args)
|
|
{
|
|
Method match = null;
|
|
for (int i = 0; i < list.length; i++)
|
|
{
|
|
Method method = list[i];
|
|
if (!method.getName().equals(name))
|
|
continue;
|
|
if (!matchParameters(args, method.getParameterTypes()))
|
|
continue;
|
|
if (match == null
|
|
|| match.getReturnType().isAssignableFrom(method.getReturnType()))
|
|
match = method;
|
|
}
|
|
return match;
|
|
}
|
|
|
|
/**
|
|
* Check for an exact match between parameter type lists.
|
|
* Either list may be <code>null</code> to mean a list of
|
|
* length zero.
|
|
*/
|
|
private static boolean matchParameters(Class[] types1, Class[] types2)
|
|
{
|
|
if (types1 == null)
|
|
return types2 == null || types2.length == 0;
|
|
if (types2 == null)
|
|
return types1 == null || types1.length == 0;
|
|
if (types1.length != types2.length)
|
|
return false;
|
|
for (int i = 0; i < types1.length; i++)
|
|
{
|
|
if (types1[i] != types2[i])
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Get all the public methods declared in this class or inherited from
|
|
* superclasses. This returns an array of length 0 if there are no methods,
|
|
* including for primitive types. This does not include the implicit
|
|
* methods of interfaces which mirror methods of Object, nor does it
|
|
* include constructors or the class initialization methods. The Virtual
|
|
* Machine allows multiple methods with the same signature but differing
|
|
* return types; all such methods are in the returned array. A security
|
|
* check may be performed, with
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
|
*
|
|
* @return all public methods in this class
|
|
* @throws SecurityException if the security check fails
|
|
* @since 1.1
|
|
*/
|
|
public Method[] getMethods()
|
|
{
|
|
memberAccessCheck(Member.PUBLIC);
|
|
// NOTE the API docs claim that no methods are returned for arrays,
|
|
// but Sun's implementation *does* return the public methods of Object
|
|
// (as would be expected), so we follow their implementation instead
|
|
// of their documentation.
|
|
return internalGetMethods();
|
|
}
|
|
|
|
/**
|
|
* Like <code>getMethods()</code> but without the security checks.
|
|
*/
|
|
private Method[] internalGetMethods()
|
|
{
|
|
HashMap<MethodKey,Method> map = new HashMap<MethodKey,Method>();
|
|
Method[] methods;
|
|
Class[] interfaces = getInterfaces();
|
|
for(int i = 0; i < interfaces.length; i++)
|
|
{
|
|
methods = interfaces[i].internalGetMethods();
|
|
for(int j = 0; j < methods.length; j++)
|
|
{
|
|
map.put(new MethodKey(methods[j]), methods[j]);
|
|
}
|
|
}
|
|
Class superClass = getSuperclass();
|
|
if(superClass != null)
|
|
{
|
|
methods = superClass.internalGetMethods();
|
|
for(int i = 0; i < methods.length; i++)
|
|
{
|
|
map.put(new MethodKey(methods[i]), methods[i]);
|
|
}
|
|
}
|
|
methods = getDeclaredMethods(true);
|
|
for(int i = 0; i < methods.length; i++)
|
|
{
|
|
map.put(new MethodKey(methods[i]), methods[i]);
|
|
}
|
|
return map.values().toArray(new Method[map.size()]);
|
|
}
|
|
|
|
/**
|
|
* Get the modifiers of this class. These can be decoded using Modifier,
|
|
* and is limited to one of public, protected, or private, and any of
|
|
* final, static, abstract, or interface. An array class has the same
|
|
* public, protected, or private modifier as its component type, and is
|
|
* marked final but not an interface. Primitive types and void are marked
|
|
* public and final, but not an interface.
|
|
*
|
|
* @return the modifiers of this class
|
|
* @see Modifier
|
|
* @since 1.1
|
|
*/
|
|
public int getModifiers()
|
|
{
|
|
int mod = VMClass.getModifiers (this, false);
|
|
return (mod & (Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE |
|
|
Modifier.FINAL | Modifier.STATIC | Modifier.ABSTRACT |
|
|
Modifier.INTERFACE));
|
|
}
|
|
|
|
/**
|
|
* Get the name of this class, separated by dots for package separators.
|
|
* If the class represents a primitive type, or void, then the
|
|
* name of the type as it appears in the Java programming language
|
|
* is returned. For instance, <code>Byte.TYPE.getName()</code>
|
|
* returns "byte".
|
|
*
|
|
* Arrays are specially encoded as shown on this table.
|
|
* <pre>
|
|
* array type [<em>element type</em>
|
|
* (note that the element type is encoded per
|
|
* this table)
|
|
* boolean Z
|
|
* byte B
|
|
* char C
|
|
* short S
|
|
* int I
|
|
* long J
|
|
* float F
|
|
* double D
|
|
* void V
|
|
* class or interface, alone: <dotted name>
|
|
* class or interface, as element type: L<dotted name>;
|
|
* </pre>
|
|
*
|
|
* @return the name of this class
|
|
*/
|
|
public String getName()
|
|
{
|
|
return VMClass.getName (this);
|
|
}
|
|
|
|
/**
|
|
* Get a resource URL using this class's package using the
|
|
* getClassLoader().getResource() method. If this class was loaded using
|
|
* the system classloader, ClassLoader.getSystemResource() is used instead.
|
|
*
|
|
* <p>If the name you supply is absolute (it starts with a <code>/</code>),
|
|
* then the leading <code>/</code> is removed and it is passed on to
|
|
* getResource(). If it is relative, the package name is prepended, and
|
|
* <code>.</code>'s are replaced with <code>/</code>.
|
|
*
|
|
* <p>The URL returned is system- and classloader-dependent, and could
|
|
* change across implementations.
|
|
*
|
|
* @param resourceName the name of the resource, generally a path
|
|
* @return the URL to the resource
|
|
* @throws NullPointerException if name is null
|
|
* @since 1.1
|
|
*/
|
|
public URL getResource(String resourceName)
|
|
{
|
|
String name = resourcePath(resourceName);
|
|
ClassLoader loader = getClassLoader();
|
|
if (loader == null)
|
|
return ClassLoader.getSystemResource(name);
|
|
return loader.getResource(name);
|
|
}
|
|
|
|
/**
|
|
* Get a resource using this class's package using the
|
|
* getClassLoader().getResourceAsStream() method. If this class was loaded
|
|
* using the system classloader, ClassLoader.getSystemResource() is used
|
|
* instead.
|
|
*
|
|
* <p>If the name you supply is absolute (it starts with a <code>/</code>),
|
|
* then the leading <code>/</code> is removed and it is passed on to
|
|
* getResource(). If it is relative, the package name is prepended, and
|
|
* <code>.</code>'s are replaced with <code>/</code>.
|
|
*
|
|
* <p>The URL returned is system- and classloader-dependent, and could
|
|
* change across implementations.
|
|
*
|
|
* @param resourceName the name of the resource, generally a path
|
|
* @return an InputStream with the contents of the resource in it, or null
|
|
* @throws NullPointerException if name is null
|
|
* @since 1.1
|
|
*/
|
|
public InputStream getResourceAsStream(String resourceName)
|
|
{
|
|
String name = resourcePath(resourceName);
|
|
ClassLoader loader = getClassLoader();
|
|
if (loader == null)
|
|
return ClassLoader.getSystemResourceAsStream(name);
|
|
return loader.getResourceAsStream(name);
|
|
}
|
|
|
|
private String resourcePath(String resourceName)
|
|
{
|
|
if (resourceName.length() > 0)
|
|
{
|
|
if (resourceName.charAt(0) != '/')
|
|
{
|
|
String pkg = getPackagePortion(getName());
|
|
if (pkg.length() > 0)
|
|
resourceName = pkg.replace('.','/') + '/' + resourceName;
|
|
}
|
|
else
|
|
{
|
|
resourceName = resourceName.substring(1);
|
|
}
|
|
}
|
|
return resourceName;
|
|
}
|
|
|
|
/**
|
|
* Get the signers of this class. This returns null if there are no signers,
|
|
* such as for primitive types or void.
|
|
*
|
|
* @return the signers of this class
|
|
* @since 1.1
|
|
*/
|
|
public Object[] getSigners()
|
|
{
|
|
return signers == null ? null : (Object[]) signers.clone ();
|
|
}
|
|
|
|
/**
|
|
* Set the signers of this class.
|
|
*
|
|
* @param signers the signers of this class
|
|
*/
|
|
void setSigners(Object[] signers)
|
|
{
|
|
this.signers = signers;
|
|
}
|
|
|
|
/**
|
|
* Get the direct superclass of this class. If this is an interface,
|
|
* Object, a primitive type, or void, it will return null. If this is an
|
|
* array type, it will return Object.
|
|
*
|
|
* @return the direct superclass of this class
|
|
*/
|
|
public Class<? super T> getSuperclass()
|
|
{
|
|
return VMClass.getSuperclass (this);
|
|
}
|
|
|
|
/**
|
|
* Return whether this class is an array type.
|
|
*
|
|
* @return whether this class is an array type
|
|
* @since 1.1
|
|
*/
|
|
public boolean isArray()
|
|
{
|
|
return VMClass.isArray (this);
|
|
}
|
|
|
|
/**
|
|
* Discover whether an instance of the Class parameter would be an
|
|
* instance of this Class as well. Think of doing
|
|
* <code>isInstance(c.newInstance())</code> or even
|
|
* <code>c.newInstance() instanceof (this class)</code>. While this
|
|
* checks widening conversions for objects, it must be exact for primitive
|
|
* types.
|
|
*
|
|
* @param c the class to check
|
|
* @return whether an instance of c would be an instance of this class
|
|
* as well
|
|
* @throws NullPointerException if c is null
|
|
* @since 1.1
|
|
*/
|
|
public boolean isAssignableFrom(Class<?> c)
|
|
{
|
|
return VMClass.isAssignableFrom (this, c);
|
|
}
|
|
|
|
/**
|
|
* Discover whether an Object is an instance of this Class. Think of it
|
|
* as almost like <code>o instanceof (this class)</code>.
|
|
*
|
|
* @param o the Object to check
|
|
* @return whether o is an instance of this class
|
|
* @since 1.1
|
|
*/
|
|
public boolean isInstance(Object o)
|
|
{
|
|
return VMClass.isInstance (this, o);
|
|
}
|
|
|
|
/**
|
|
* Check whether this class is an interface or not. Array types are not
|
|
* interfaces.
|
|
*
|
|
* @return whether this class is an interface or not
|
|
*/
|
|
public boolean isInterface()
|
|
{
|
|
return VMClass.isInterface (this);
|
|
}
|
|
|
|
/**
|
|
* Return whether this class is a primitive type. A primitive type class
|
|
* is a class representing a kind of "placeholder" for the various
|
|
* primitive types, or void. You can access the various primitive type
|
|
* classes through java.lang.Boolean.TYPE, java.lang.Integer.TYPE, etc.,
|
|
* or through boolean.class, int.class, etc.
|
|
*
|
|
* @return whether this class is a primitive type
|
|
* @see Boolean#TYPE
|
|
* @see Byte#TYPE
|
|
* @see Character#TYPE
|
|
* @see Short#TYPE
|
|
* @see Integer#TYPE
|
|
* @see Long#TYPE
|
|
* @see Float#TYPE
|
|
* @see Double#TYPE
|
|
* @see Void#TYPE
|
|
* @since 1.1
|
|
*/
|
|
public boolean isPrimitive()
|
|
{
|
|
return VMClass.isPrimitive (this);
|
|
}
|
|
|
|
/**
|
|
* Get a new instance of this class by calling the no-argument constructor.
|
|
* The class is initialized if it has not been already. A security check
|
|
* may be performed, with <code>checkMemberAccess(this, Member.PUBLIC)</code>
|
|
* as well as <code>checkPackageAccess</code> both having to succeed.
|
|
*
|
|
* @return a new instance of this class
|
|
* @throws InstantiationException if there is not a no-arg constructor
|
|
* for this class, including interfaces, abstract classes, arrays,
|
|
* primitive types, and void; or if an exception occurred during
|
|
* the constructor
|
|
* @throws IllegalAccessException if you are not allowed to access the
|
|
* no-arg constructor because of scoping reasons
|
|
* @throws SecurityException if the security check fails
|
|
* @throws ExceptionInInitializerError if class initialization caused by
|
|
* this call fails with an exception
|
|
*/
|
|
public T newInstance()
|
|
throws InstantiationException, IllegalAccessException
|
|
{
|
|
memberAccessCheck(Member.PUBLIC);
|
|
Constructor<T> constructor;
|
|
synchronized(this)
|
|
{
|
|
constructor = this.constructor;
|
|
}
|
|
if (constructor == null)
|
|
{
|
|
Constructor[] constructors = getDeclaredConstructors(false);
|
|
for (int i = 0; i < constructors.length; i++)
|
|
{
|
|
if (constructors[i].getParameterTypes().length == 0)
|
|
{
|
|
constructor = constructors[i];
|
|
break;
|
|
}
|
|
}
|
|
if (constructor == null)
|
|
throw new InstantiationException(getName());
|
|
if (!Modifier.isPublic(constructor.getModifiers())
|
|
|| !Modifier.isPublic(VMClass.getModifiers(this, true)))
|
|
{
|
|
setAccessible(constructor);
|
|
}
|
|
synchronized(this)
|
|
{
|
|
if (this.constructor == null)
|
|
this.constructor = constructor;
|
|
}
|
|
}
|
|
int modifiers = constructor.getModifiers();
|
|
if (!Modifier.isPublic(modifiers)
|
|
|| !Modifier.isPublic(VMClass.getModifiers(this, true)))
|
|
{
|
|
Class caller = VMStackWalker.getCallingClass();
|
|
if (caller != null &&
|
|
caller != this &&
|
|
(Modifier.isPrivate(modifiers)
|
|
|| getClassLoader() != caller.getClassLoader()
|
|
|| !getPackagePortion(getName())
|
|
.equals(getPackagePortion(caller.getName()))))
|
|
throw new IllegalAccessException(getName()
|
|
+ " has an inaccessible constructor");
|
|
}
|
|
try
|
|
{
|
|
return constructor.newInstance();
|
|
}
|
|
catch (InvocationTargetException e)
|
|
{
|
|
VMClass.throwException(e.getTargetException());
|
|
throw (InternalError) new InternalError
|
|
("VMClass.throwException returned").initCause(e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the protection domain of this class. If the classloader did not
|
|
* record the protection domain when creating this class the unknown
|
|
* protection domain is returned which has a <code>null</code> code source
|
|
* and all permissions. A security check may be performed, with
|
|
* <code>RuntimePermission("getProtectionDomain")</code>.
|
|
*
|
|
* @return the protection domain
|
|
* @throws SecurityException if the security manager exists and the caller
|
|
* does not have <code>RuntimePermission("getProtectionDomain")</code>.
|
|
* @see RuntimePermission
|
|
* @since 1.2
|
|
*/
|
|
public ProtectionDomain getProtectionDomain()
|
|
{
|
|
SecurityManager sm = SecurityManager.current;
|
|
if (sm != null)
|
|
sm.checkPermission(new RuntimePermission("getProtectionDomain"));
|
|
|
|
return pd == null ? StaticData.unknownProtectionDomain : pd;
|
|
}
|
|
|
|
/**
|
|
* Return the human-readable form of this Object. For an object, this
|
|
* is either "interface " or "class " followed by <code>getName()</code>,
|
|
* for primitive types and void it is just <code>getName()</code>.
|
|
*
|
|
* @return the human-readable form of this Object
|
|
*/
|
|
public String toString()
|
|
{
|
|
if (isPrimitive())
|
|
return getName();
|
|
return (isInterface() ? "interface " : "class ") + getName();
|
|
}
|
|
|
|
/**
|
|
* Returns the desired assertion status of this class, if it were to be
|
|
* initialized at this moment. The class assertion status, if set, is
|
|
* returned; the backup is the default package status; then if there is
|
|
* a class loader, that default is returned; and finally the system default
|
|
* is returned. This method seldom needs calling in user code, but exists
|
|
* for compilers to implement the assert statement. Note that there is no
|
|
* guarantee that the result of this method matches the class's actual
|
|
* assertion status.
|
|
*
|
|
* @return the desired assertion status
|
|
* @see ClassLoader#setClassAssertionStatus(String, boolean)
|
|
* @see ClassLoader#setPackageAssertionStatus(String, boolean)
|
|
* @see ClassLoader#setDefaultAssertionStatus(boolean)
|
|
* @since 1.4
|
|
*/
|
|
public boolean desiredAssertionStatus()
|
|
{
|
|
ClassLoader c = getClassLoader();
|
|
Object status;
|
|
if (c == null)
|
|
return VMClassLoader.defaultAssertionStatus();
|
|
if (c.classAssertionStatus != null)
|
|
synchronized (c)
|
|
{
|
|
status = c.classAssertionStatus.get(getName());
|
|
if (status != null)
|
|
return status.equals(Boolean.TRUE);
|
|
}
|
|
else
|
|
{
|
|
status = ClassLoader.StaticData.
|
|
systemClassAssertionStatus.get(getName());
|
|
if (status != null)
|
|
return status.equals(Boolean.TRUE);
|
|
}
|
|
if (c.packageAssertionStatus != null)
|
|
synchronized (c)
|
|
{
|
|
String name = getPackagePortion(getName());
|
|
if ("".equals(name))
|
|
status = c.packageAssertionStatus.get(null);
|
|
else
|
|
do
|
|
{
|
|
status = c.packageAssertionStatus.get(name);
|
|
name = getPackagePortion(name);
|
|
}
|
|
while (! "".equals(name) && status == null);
|
|
if (status != null)
|
|
return status.equals(Boolean.TRUE);
|
|
}
|
|
else
|
|
{
|
|
String name = getPackagePortion(getName());
|
|
if ("".equals(name))
|
|
status = ClassLoader.StaticData.
|
|
systemPackageAssertionStatus.get(null);
|
|
else
|
|
do
|
|
{
|
|
status = ClassLoader.StaticData.
|
|
systemPackageAssertionStatus.get(name);
|
|
name = getPackagePortion(name);
|
|
}
|
|
while (! "".equals(name) && status == null);
|
|
if (status != null)
|
|
return status.equals(Boolean.TRUE);
|
|
}
|
|
return c.defaultAssertionStatus;
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Casts this class to represent a subclass of the specified class.
|
|
* This method is useful for `narrowing' the type of a class so that
|
|
* the class object, and instances of that class, can match the contract
|
|
* of a more restrictive method. For example, if this class has the
|
|
* static type of <code>Class<Object></code>, and a dynamic type of
|
|
* <code>Class<Rectangle></code>, then, assuming <code>Shape</code> is
|
|
* a superclass of <code>Rectangle</code>, this method can be used on
|
|
* this class with the parameter, <code>Class<Shape></code>, to retain
|
|
* the same instance but with the type
|
|
* <code>Class<? extends Shape></code>.
|
|
* </p>
|
|
* <p>
|
|
* If this class can be converted to an instance which is parameterised
|
|
* over a subtype of the supplied type, <code>U</code>, then this method
|
|
* returns an appropriately cast reference to this object. Otherwise,
|
|
* a <code>ClassCastException</code> is thrown.
|
|
* </p>
|
|
*
|
|
* @param klass the class object, the parameterized type (<code>U</code>) of
|
|
* which should be a superclass of the parameterized type of
|
|
* this instance.
|
|
* @return a reference to this object, appropriately cast.
|
|
* @throws ClassCastException if this class can not be converted to one
|
|
* which represents a subclass of the specified
|
|
* type, <code>U</code>.
|
|
* @since 1.5
|
|
*/
|
|
public <U> Class<? extends U> asSubclass(Class<U> klass)
|
|
{
|
|
if (! klass.isAssignableFrom(this))
|
|
throw new ClassCastException();
|
|
return (Class<? extends U>) this;
|
|
}
|
|
|
|
/**
|
|
* Returns the specified object, cast to this <code>Class</code>' type.
|
|
*
|
|
* @param obj the object to cast
|
|
* @throws ClassCastException if obj is not an instance of this class
|
|
* @since 1.5
|
|
*/
|
|
public T cast(Object obj)
|
|
{
|
|
if (obj != null && ! isInstance(obj))
|
|
throw new ClassCastException();
|
|
return (T) obj;
|
|
}
|
|
|
|
/**
|
|
* Like <code>getField(String)</code> but without the security checks and
|
|
* returns null instead of throwing NoSuchFieldException.
|
|
*/
|
|
private Field internalGetField(String name)
|
|
{
|
|
Field[] fields = getDeclaredFields(true);
|
|
for (int i = 0; i < fields.length; i++)
|
|
{
|
|
Field field = fields[i];
|
|
if (field.getName().equals(name))
|
|
return field;
|
|
}
|
|
Class[] interfaces = getInterfaces();
|
|
for (int i = 0; i < interfaces.length; i++)
|
|
{
|
|
Field field = interfaces[i].internalGetField(name);
|
|
if(field != null)
|
|
return field;
|
|
}
|
|
Class superClass = getSuperclass();
|
|
if (superClass != null)
|
|
return superClass.internalGetField(name);
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Strip the last portion of the name (after the last dot).
|
|
*
|
|
* @param name the name to get package of
|
|
* @return the package name, or "" if no package
|
|
*/
|
|
private static String getPackagePortion(String name)
|
|
{
|
|
int lastInd = name.lastIndexOf('.');
|
|
if (lastInd == -1)
|
|
return "";
|
|
return name.substring(0, lastInd);
|
|
}
|
|
|
|
/**
|
|
* Perform security checks common to all of the methods that
|
|
* get members of this Class.
|
|
*/
|
|
private void memberAccessCheck(int which)
|
|
{
|
|
SecurityManager sm = SecurityManager.current;
|
|
if (sm != null)
|
|
{
|
|
sm.checkMemberAccess(this, which);
|
|
Package pkg = getPackage();
|
|
if (pkg != null)
|
|
sm.checkPackageAccess(pkg.getName());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the enumeration constants of this class, or
|
|
* null if this class is not an <code>Enum</code>.
|
|
*
|
|
* @return an array of <code>Enum</code> constants
|
|
* associated with this class, or null if this
|
|
* class is not an <code>enum</code>.
|
|
* @since 1.5
|
|
*/
|
|
public T[] getEnumConstants()
|
|
{
|
|
if (isEnum())
|
|
{
|
|
try
|
|
{
|
|
Method m = getMethod("values");
|
|
setAccessible(m);
|
|
return (T[]) m.invoke(null);
|
|
}
|
|
catch (NoSuchMethodException exception)
|
|
{
|
|
throw new Error("Enum lacks values() method");
|
|
}
|
|
catch (IllegalAccessException exception)
|
|
{
|
|
throw new Error("Unable to access Enum class");
|
|
}
|
|
catch (InvocationTargetException exception)
|
|
{
|
|
throw new
|
|
RuntimeException("The values method threw an exception",
|
|
exception);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns true if this class is an <code>Enum</code>.
|
|
*
|
|
* @return true if this is an enumeration class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isEnum()
|
|
{
|
|
int mod = VMClass.getModifiers (this, true);
|
|
return (mod & ENUM) != 0;
|
|
}
|
|
|
|
/**
|
|
* Returns true if this class is a synthetic class, generated by
|
|
* the compiler.
|
|
*
|
|
* @return true if this is a synthetic class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isSynthetic()
|
|
{
|
|
int mod = VMClass.getModifiers (this, true);
|
|
return (mod & SYNTHETIC) != 0;
|
|
}
|
|
|
|
/**
|
|
* Returns true if this class is an <code>Annotation</code>.
|
|
*
|
|
* @return true if this is an annotation class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isAnnotation()
|
|
{
|
|
int mod = VMClass.getModifiers (this, true);
|
|
return (mod & ANNOTATION) != 0;
|
|
}
|
|
|
|
/**
|
|
* Returns the simple name for this class, as used in the source
|
|
* code. For normal classes, this is the content returned by
|
|
* <code>getName()</code> which follows the last ".". Anonymous
|
|
* classes have no name, and so the result of calling this method is
|
|
* "". The simple name of an array consists of the simple name of
|
|
* its component type, followed by "[]". Thus, an array with the
|
|
* component type of an anonymous class has a simple name of simply
|
|
* "[]".
|
|
*
|
|
* @return the simple name for this class.
|
|
* @since 1.5
|
|
*/
|
|
public String getSimpleName()
|
|
{
|
|
return VMClass.getSimpleName(this);
|
|
}
|
|
|
|
/**
|
|
* Returns this class' annotation for the specified annotation type,
|
|
* or <code>null</code> if no such annotation exists.
|
|
*
|
|
* @param annotationClass the type of annotation to look for.
|
|
* @return this class' annotation for the specified type, or
|
|
* <code>null</code> if no such annotation exists.
|
|
* @since 1.5
|
|
*/
|
|
public <A extends Annotation> A getAnnotation(Class<A> annotationClass)
|
|
{
|
|
A foundAnnotation = null;
|
|
Annotation[] annotations = getAnnotations();
|
|
for (Annotation annotation : annotations)
|
|
if (annotation.annotationType() == annotationClass)
|
|
foundAnnotation = (A) annotation;
|
|
return foundAnnotation;
|
|
}
|
|
|
|
/**
|
|
* Returns all annotations associated with this class. If there are
|
|
* no annotations associated with this class, then a zero-length array
|
|
* will be returned. The returned array may be modified by the client
|
|
* code, but this will have no effect on the annotation content of this
|
|
* class, and hence no effect on the return value of this method for
|
|
* future callers.
|
|
*
|
|
* @return this class' annotations.
|
|
* @since 1.5
|
|
*/
|
|
public Annotation[] getAnnotations()
|
|
{
|
|
HashMap<Class, Annotation> map = new HashMap<Class, Annotation>();
|
|
for (Annotation a : getDeclaredAnnotations())
|
|
map.put((Class) a.annotationType(), a);
|
|
for (Class<? super T> s = getSuperclass();
|
|
s != null;
|
|
s = s.getSuperclass())
|
|
{
|
|
for (Annotation a : s.getDeclaredAnnotations())
|
|
{
|
|
Class k = (Class) a.annotationType();
|
|
if (! map.containsKey(k) && k.isAnnotationPresent(Inherited.class))
|
|
map.put(k, a);
|
|
}
|
|
}
|
|
Collection<Annotation> v = map.values();
|
|
return v.toArray(new Annotation[v.size()]);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Returns the canonical name of this class, as defined by section
|
|
* 6.7 of the Java language specification. Each package, top-level class,
|
|
* top-level interface and primitive type has a canonical name. A member
|
|
* class has a canonical name, if its parent class has one. Likewise,
|
|
* an array type has a canonical name, if its component type does.
|
|
* Local or anonymous classes do not have canonical names.
|
|
* </p>
|
|
* <p>
|
|
* The canonical name for top-level classes, top-level interfaces and
|
|
* primitive types is always the same as the fully-qualified name.
|
|
* For array types, the canonical name is the canonical name of its
|
|
* component type with `[]' appended.
|
|
* </p>
|
|
* <p>
|
|
* The canonical name of a member class always refers to the place where
|
|
* the class was defined, and is composed of the canonical name of the
|
|
* defining class and the simple name of the member class, joined by `.'.
|
|
* For example, if a <code>Person</code> class has an inner class,
|
|
* <code>M</code>, then both its fully-qualified name and canonical name
|
|
* is <code>Person.M</code>. A subclass, <code>Staff</code>, of
|
|
* <code>Person</code> refers to the same inner class by the fully-qualified
|
|
* name of <code>Staff.M</code>, but its canonical name is still
|
|
* <code>Person.M</code>.
|
|
* </p>
|
|
* <p>
|
|
* Where no canonical name is present, <code>null</code> is returned.
|
|
* </p>
|
|
*
|
|
* @return the canonical name of the class, or <code>null</code> if the
|
|
* class doesn't have a canonical name.
|
|
* @since 1.5
|
|
*/
|
|
public String getCanonicalName()
|
|
{
|
|
return VMClass.getCanonicalName(this);
|
|
}
|
|
|
|
/**
|
|
* Returns all annotations directly defined by this class. If there are
|
|
* no annotations associated with this class, then a zero-length array
|
|
* will be returned. The returned array may be modified by the client
|
|
* code, but this will have no effect on the annotation content of this
|
|
* class, and hence no effect on the return value of this method for
|
|
* future callers.
|
|
*
|
|
* @return the annotations directly defined by this class.
|
|
* @since 1.5
|
|
*/
|
|
public Annotation[] getDeclaredAnnotations()
|
|
{
|
|
return VMClass.getDeclaredAnnotations(this);
|
|
}
|
|
|
|
/**
|
|
* Returns the class which immediately encloses this class. If this class
|
|
* is a top-level class, this method returns <code>null</code>.
|
|
*
|
|
* @return the immediate enclosing class, or <code>null</code> if this is
|
|
* a top-level class.
|
|
* @since 1.5
|
|
*/
|
|
public Class<?> getEnclosingClass()
|
|
{
|
|
return VMClass.getEnclosingClass(this);
|
|
}
|
|
|
|
/**
|
|
* Returns the constructor which immediately encloses this class. If
|
|
* this class is a top-level class, or a local or anonymous class
|
|
* immediately enclosed by a type definition, instance initializer
|
|
* or static initializer, then <code>null</code> is returned.
|
|
*
|
|
* @return the immediate enclosing constructor if this class is
|
|
* declared within a constructor. Otherwise, <code>null</code>
|
|
* is returned.
|
|
* @since 1.5
|
|
*/
|
|
public Constructor<?> getEnclosingConstructor()
|
|
{
|
|
return VMClass.getEnclosingConstructor(this);
|
|
}
|
|
|
|
/**
|
|
* Returns the method which immediately encloses this class. If
|
|
* this class is a top-level class, or a local or anonymous class
|
|
* immediately enclosed by a type definition, instance initializer
|
|
* or static initializer, then <code>null</code> is returned.
|
|
*
|
|
* @return the immediate enclosing method if this class is
|
|
* declared within a method. Otherwise, <code>null</code>
|
|
* is returned.
|
|
* @since 1.5
|
|
*/
|
|
public Method getEnclosingMethod()
|
|
{
|
|
return VMClass.getEnclosingMethod(this);
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Returns an array of <code>Type</code> objects which represent the
|
|
* interfaces directly implemented by this class or extended by this
|
|
* interface.
|
|
* </p>
|
|
* <p>
|
|
* If one of the superinterfaces is a parameterized type, then the
|
|
* object returned for this interface reflects the actual type
|
|
* parameters used in the source code. Type parameters are created
|
|
* using the semantics specified by the <code>ParameterizedType</code>
|
|
* interface, and only if an instance has not already been created.
|
|
* </p>
|
|
* <p>
|
|
* The order of the interfaces in the array matches the order in which
|
|
* the interfaces are declared. For classes which represent an array,
|
|
* an array of two interfaces, <code>Cloneable</code> and
|
|
* <code>Serializable</code>, is always returned, with the objects in
|
|
* that order. A class representing a primitive type or void always
|
|
* returns an array of zero size.
|
|
* </p>
|
|
*
|
|
* @return an array of interfaces implemented or extended by this class.
|
|
* @throws GenericSignatureFormatError if the generic signature of one
|
|
* of the interfaces does not comply with that specified by the Java
|
|
* Virtual Machine specification, 3rd edition.
|
|
* @throws TypeNotPresentException if any of the superinterfaces refers
|
|
* to a non-existant type.
|
|
* @throws MalformedParameterizedTypeException if any of the interfaces
|
|
* refer to a parameterized type that can not be instantiated for
|
|
* some reason.
|
|
* @since 1.5
|
|
* @see java.lang.reflect.ParameterizedType
|
|
*/
|
|
public Type[] getGenericInterfaces()
|
|
{
|
|
if (isPrimitive())
|
|
return new Type[0];
|
|
|
|
String sig = VMClass.getClassSignature(this);
|
|
if (sig == null)
|
|
return getInterfaces();
|
|
|
|
ClassSignatureParser p = new ClassSignatureParser(this, sig);
|
|
return p.getInterfaceTypes();
|
|
}
|
|
|
|
/**
|
|
* <p>
|
|
* Returns a <code>Type</code> object representing the direct superclass,
|
|
* whether class, interface, primitive type or void, of this class.
|
|
* If this class is an array class, then a class instance representing
|
|
* the <code>Object</code> class is returned. If this class is primitive,
|
|
* an interface, or a representation of either the <code>Object</code>
|
|
* class or void, then <code>null</code> is returned.
|
|
* </p>
|
|
* <p>
|
|
* If the superclass is a parameterized type, then the
|
|
* object returned for this interface reflects the actual type
|
|
* parameters used in the source code. Type parameters are created
|
|
* using the semantics specified by the <code>ParameterizedType</code>
|
|
* interface, and only if an instance has not already been created.
|
|
* </p>
|
|
*
|
|
* @return the superclass of this class.
|
|
* @throws GenericSignatureFormatError if the generic signature of the
|
|
* class does not comply with that specified by the Java
|
|
* Virtual Machine specification, 3rd edition.
|
|
* @throws TypeNotPresentException if the superclass refers
|
|
* to a non-existant type.
|
|
* @throws MalformedParameterizedTypeException if the superclass
|
|
* refers to a parameterized type that can not be instantiated for
|
|
* some reason.
|
|
* @since 1.5
|
|
* @see java.lang.reflect.ParameterizedType
|
|
*/
|
|
public Type getGenericSuperclass()
|
|
{
|
|
if (isArray())
|
|
return Object.class;
|
|
|
|
if (isPrimitive() || isInterface() || this == Object.class)
|
|
return null;
|
|
|
|
String sig = VMClass.getClassSignature(this);
|
|
if (sig == null)
|
|
return getSuperclass();
|
|
|
|
ClassSignatureParser p = new ClassSignatureParser(this, sig);
|
|
return p.getSuperclassType();
|
|
}
|
|
|
|
/**
|
|
* Returns an array of <code>TypeVariable</code> objects that represents
|
|
* the type variables declared by this class, in declaration order.
|
|
* An array of size zero is returned if this class has no type
|
|
* variables.
|
|
*
|
|
* @return the type variables associated with this class.
|
|
* @throws GenericSignatureFormatError if the generic signature does
|
|
* not conform to the format specified in the Virtual Machine
|
|
* specification, version 3.
|
|
* @since 1.5
|
|
*/
|
|
public TypeVariable<Class<T>>[] getTypeParameters()
|
|
{
|
|
String sig = VMClass.getClassSignature(this);
|
|
if (sig == null)
|
|
return (TypeVariable<Class<T>>[])new TypeVariable[0];
|
|
|
|
ClassSignatureParser p = new ClassSignatureParser(this, sig);
|
|
return p.getTypeParameters();
|
|
}
|
|
|
|
/**
|
|
* Returns true if an annotation for the specified type is associated
|
|
* with this class. This is primarily a short-hand for using marker
|
|
* annotations.
|
|
*
|
|
* @param annotationClass the type of annotation to look for.
|
|
* @return true if an annotation exists for the specified type.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isAnnotationPresent(Class<? extends Annotation>
|
|
annotationClass)
|
|
{
|
|
return getAnnotation(annotationClass) != null;
|
|
}
|
|
|
|
/**
|
|
* Returns true if this object represents an anonymous class.
|
|
*
|
|
* @return true if this object represents an anonymous class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isAnonymousClass()
|
|
{
|
|
return VMClass.isAnonymousClass(this);
|
|
}
|
|
|
|
/**
|
|
* Returns true if this object represents an local class.
|
|
*
|
|
* @return true if this object represents an local class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isLocalClass()
|
|
{
|
|
return VMClass.isLocalClass(this);
|
|
}
|
|
|
|
/**
|
|
* Returns true if this object represents an member class.
|
|
*
|
|
* @return true if this object represents an member class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isMemberClass()
|
|
{
|
|
return VMClass.isMemberClass(this);
|
|
}
|
|
|
|
/**
|
|
* Utility method for use by classes in this package.
|
|
*/
|
|
static void setAccessible(final AccessibleObject obj)
|
|
{
|
|
AccessController.doPrivileged(new PrivilegedAction()
|
|
{
|
|
public Object run()
|
|
{
|
|
obj.setAccessible(true);
|
|
return null;
|
|
}
|
|
});
|
|
}
|
|
}
|