1020 lines
37 KiB
Java
1020 lines
37 KiB
Java
/* Class.java -- Representation of a Java class.
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Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006
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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 java.io.InputStream;
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import java.io.Serializable;
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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.Member;
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import java.lang.reflect.Method;
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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.ProtectionDomain;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashSet;
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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@cygnus.com)
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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 implements Type, GenericDeclaration, Serializable
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{
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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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private Class ()
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{
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}
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// Initialize the class.
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private native void initializeClass ();
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// finalization
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protected native void finalize () throws Throwable;
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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 native Class forName (String className)
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throws ClassNotFoundException;
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// A private internal method that is called by compiler-generated code.
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private static Class forName (String className, Class caller)
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throws ClassNotFoundException
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{
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return forName(className, true, caller.getClassLoaderInternal());
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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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* @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 native Class forName (String className, boolean initialize,
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ClassLoader loader)
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throws ClassNotFoundException;
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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 list = new ArrayList();
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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 (Class[])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 native ClassLoader getClassLoader ();
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// A private internal method that is called by compiler-generated code.
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private final native ClassLoader getClassLoader (Class caller);
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/**
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* Internal method that circumvents the usual security checks when
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* getting the class loader.
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*/
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private native ClassLoader getClassLoaderInternal ();
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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 native Class getComponentType ();
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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 native Constructor getConstructor(Class[] args)
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throws NoSuchMethodException;
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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 native Constructor getDeclaredConstructor(Class[] args)
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throws NoSuchMethodException;
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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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native Class[] getDeclaredClasses (boolean publicOnly);
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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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native Constructor[] getDeclaredConstructors (boolean publicOnly);
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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 native Field getDeclaredField(String fieldName)
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throws NoSuchFieldException;
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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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native Field[] getDeclaredFields (boolean publicOnly);
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private native Method _getDeclaredMethod(String methodName, Class[] args);
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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[] args)
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throws NoSuchMethodException
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{
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memberAccessCheck(Member.DECLARED);
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if ("<init>".equals(methodName) || "<clinit>".equals(methodName))
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throw new NoSuchMethodException(methodName);
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Method match = _getDeclaredMethod(methodName, args);
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if (match == null)
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throw new NoSuchMethodException(methodName);
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return match;
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}
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/**
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* Get all the declared methods in this class, but not those inherited from
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* superclasses. This returns an array of length 0 if there are no methods,
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* including for primitive types. This does include the implicit methods of
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* arrays and interfaces which mirror methods of Object, nor does it
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* include constructors or the class initialization methods. The Virtual
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* Machine allows multiple methods with the same signature but differing
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* return types; all such methods are in the returned array. 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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* @return all declared methods 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 native Method[] getDeclaredMethods();
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/**
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* If this is a nested or inner class, return the class that declared it.
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* If not, return null.
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*
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* @return the declaring class of this class
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* @since 1.1
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*/
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// This is marked as unimplemented in the JCL book.
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public native Class getDeclaringClass ();
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private native Field getField (String fieldName, int hash)
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throws NoSuchFieldException;
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|
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/**
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* Get a public field declared or inherited in this class, where name is
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* its simple name. If the class contains multiple accessible fields by
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* that name, an arbitrary one is returned. The implicit length field of
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* arrays is not available. 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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* @param fieldName 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 #getFields()
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* @since 1.1
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*/
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public Field getField(String fieldName)
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throws NoSuchFieldException
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{
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memberAccessCheck(Member.PUBLIC);
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Field field = getField(fieldName, fieldName.hashCode());
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if (field == null)
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throw new NoSuchFieldException(fieldName);
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return field;
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}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
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* @return all public 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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*/
|
|
public Field[] getFields()
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{
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memberAccessCheck(Member.PUBLIC);
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return internalGetFields();
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}
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|
|
/**
|
|
* Like <code>getFields()</code> but without the security checks.
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|
*/
|
|
private Field[] internalGetFields()
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|
{
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HashSet set = new HashSet();
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set.addAll(Arrays.asList(getDeclaredFields(true)));
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Class[] interfaces = getInterfaces();
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for (int i = 0; i < interfaces.length; i++)
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set.addAll(Arrays.asList(interfaces[i].internalGetFields()));
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Class superClass = getSuperclass();
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if (superClass != null)
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set.addAll(Arrays.asList(superClass.internalGetFields()));
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return (Field[])set.toArray(new Field[set.size()]);
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}
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|
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/**
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* Returns the <code>Package</code> in which this class is defined
|
|
* Returns null when this information is not available from the
|
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* classloader of this class.
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|
*
|
|
* @return the package for this class, if it is available
|
|
* @since 1.2
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*/
|
|
public Package getPackage()
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|
{
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ClassLoader cl = getClassLoaderInternal();
|
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if (cl != null)
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return cl.getPackage(getPackagePortion(getName()));
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else
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return VMClassLoader.getPackage(getPackagePortion(getName()));
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}
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|
|
/**
|
|
* 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
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|
*/
|
|
public native Class[] getInterfaces ();
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|
private final native void getSignature(StringBuffer buffer);
|
|
private static final native String getSignature(Class[] args,
|
|
boolean is_construtor);
|
|
|
|
public native Method _getMethod(String methodName, Class[] args);
|
|
|
|
/**
|
|
* 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[] args)
|
|
throws NoSuchMethodException
|
|
{
|
|
memberAccessCheck(Member.PUBLIC);
|
|
|
|
if ("<init>".equals(methodName) || "<clinit>".equals(methodName))
|
|
throw new NoSuchMethodException(methodName);
|
|
|
|
Method method = _getMethod(methodName, args);
|
|
if (method == null)
|
|
throw new NoSuchMethodException(methodName);
|
|
return method;
|
|
}
|
|
|
|
private native int _getMethods (Method[] result, int offset);
|
|
|
|
/**
|
|
* 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 native Method[] getMethods();
|
|
|
|
/**
|
|
* 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 Modifer
|
|
* @since 1.1
|
|
*/
|
|
public native int getModifiers ();
|
|
|
|
/**
|
|
* 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 native String getName ();
|
|
|
|
/**
|
|
* 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 = getClassLoaderInternal();
|
|
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 = getClassLoaderInternal();
|
|
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 native Object[] getSigners ();
|
|
|
|
/**
|
|
* Set the signers of this class.
|
|
*
|
|
* @param signers the signers of this class
|
|
*/
|
|
native void setSigners(Object[] 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 native Class getSuperclass ();
|
|
|
|
/**
|
|
* Return whether this class is an array type.
|
|
*
|
|
* @return whether this class is an array type
|
|
* @since 1.1
|
|
*/
|
|
public native boolean isArray ();
|
|
|
|
/**
|
|
* 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 native boolean isAssignableFrom (Class 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 native boolean isInstance (Object 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 native boolean isInterface ();
|
|
|
|
/**
|
|
* 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 native boolean isPrimitive ();
|
|
|
|
/**
|
|
* 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 native Object newInstance ()
|
|
throws InstantiationException, IllegalAccessException;
|
|
|
|
// We need a native method to retrieve the protection domain, because we
|
|
// can't add fields to java.lang.Class that are accessible from Java.
|
|
private native ProtectionDomain getProtectionDomain0();
|
|
|
|
/**
|
|
* 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 = System.getSecurityManager();
|
|
if (sm != null)
|
|
sm.checkPermission(VMClassLoader.protectionDomainPermission);
|
|
|
|
ProtectionDomain protectionDomain = getProtectionDomain0();
|
|
|
|
if (protectionDomain == null)
|
|
return VMClassLoader.unknownProtectionDomain;
|
|
else
|
|
return protectionDomain;
|
|
}
|
|
|
|
/**
|
|
* 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 = getClassLoaderInternal();
|
|
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.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.systemPackageAssertionStatus.get(null);
|
|
else
|
|
do
|
|
{
|
|
status = ClassLoader.systemPackageAssertionStatus.get(name);
|
|
name = getPackagePortion(name);
|
|
}
|
|
while (! "".equals(name) && status == null);
|
|
if (status != null)
|
|
return status.equals(Boolean.TRUE);
|
|
}
|
|
return c.defaultAssertionStatus;
|
|
}
|
|
|
|
/**
|
|
* 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 = System.getSecurityManager();
|
|
if (sm != null)
|
|
{
|
|
sm.checkMemberAccess(this, which);
|
|
Package pkg = getPackage();
|
|
if (pkg != null)
|
|
sm.checkPackageAccess(pkg.getName());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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()
|
|
{
|
|
// FIXME write real implementation
|
|
return "";
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
/* FIXME[GENERICS]: Should return Class<?> */
|
|
public Class getEnclosingClass()
|
|
{
|
|
// FIXME write real implementation
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
/* FIXME[GENERICS]: Should return Constructor<?> */
|
|
public Constructor getEnclosingConstructor()
|
|
{
|
|
// FIXME write real implementation
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* 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()
|
|
{
|
|
// FIXME write real implementation
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
/* FIXME[GENERICS]: Should return TypeVariable<Class<T>> */
|
|
public TypeVariable[] getTypeParameters()
|
|
{
|
|
// FIXME - provide real implementation.
|
|
return new TypeVariable[0];
|
|
}
|
|
}
|