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jlechner |
/* Class.java -- Representation of a Java class.
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Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004, 2005
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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.Member;
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import java.lang.reflect.Method;
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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 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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/**
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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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/**
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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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|
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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
|
294 |
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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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296 |
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* as well as <code>checkPackageAccess</code> both having to succeed.
|
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*
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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
|
301 |
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* @throws SecurityException if the security check fails
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302 |
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* @see #getDeclaredFields()
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303 |
|
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* @since 1.1
|
304 |
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*/
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public native Field getDeclaredField(String fieldName)
|
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throws NoSuchFieldException;
|
307 |
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|
308 |
|
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/**
|
309 |
|
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* Get all the declared fields in this class, but not those inherited from
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310 |
|
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* superclasses. This returns an array of length 0 if there are no fields,
|
311 |
|
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* including for primitive types. This does not return the implicit length
|
312 |
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* field of arrays. A security check may be performed, with
|
313 |
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* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
|
314 |
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
315 |
|
|
*
|
316 |
|
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* @return all declared fields in this class
|
317 |
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* @throws SecurityException if the security check fails
|
318 |
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|
* @since 1.1
|
319 |
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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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325 |
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native Field[] getDeclaredFields (boolean publicOnly);
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|
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private native Method _getDeclaredMethod(String methodName, Class[] args);
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|
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|
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/**
|
331 |
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* Get a method declared in this class, where name is its simple name. The
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332 |
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* implicit methods of Object are not available from arrays or interfaces.
|
333 |
|
|
* Constructors (named "<init>" in the class file) and class initializers
|
334 |
|
|
* (name "<clinit>") are not available. The Virtual Machine allows
|
335 |
|
|
* multiple methods with the same signature but differing return types; in
|
336 |
|
|
* such a case the most specific return types are favored, then the final
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337 |
|
|
* choice is arbitrary. If the method takes no argument, an array of zero
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338 |
|
|
* elements and null are equivalent for the types argument. A security
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339 |
|
|
* check may be performed, with
|
340 |
|
|
* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
|
341 |
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
342 |
|
|
*
|
343 |
|
|
* @param methodName the name of the method
|
344 |
|
|
* @param types the type of each parameter
|
345 |
|
|
* @return the method
|
346 |
|
|
* @throws NoSuchMethodException if the method does not exist
|
347 |
|
|
* @throws SecurityException if the security check fails
|
348 |
|
|
* @see #getDeclaredMethods()
|
349 |
|
|
* @since 1.1
|
350 |
|
|
*/
|
351 |
|
|
public Method getDeclaredMethod(String methodName, Class[] args)
|
352 |
|
|
throws NoSuchMethodException
|
353 |
|
|
{
|
354 |
|
|
memberAccessCheck(Member.DECLARED);
|
355 |
|
|
|
356 |
|
|
if ("<init>".equals(methodName) || "<clinit>".equals(methodName))
|
357 |
|
|
throw new NoSuchMethodException(methodName);
|
358 |
|
|
|
359 |
|
|
Method match = _getDeclaredMethod(methodName, args);
|
360 |
|
|
if (match == null)
|
361 |
|
|
throw new NoSuchMethodException(methodName);
|
362 |
|
|
return match;
|
363 |
|
|
}
|
364 |
|
|
|
365 |
|
|
/**
|
366 |
|
|
* Get all the declared methods in this class, but not those inherited from
|
367 |
|
|
* superclasses. This returns an array of length 0 if there are no methods,
|
368 |
|
|
* including for primitive types. This does include the implicit methods of
|
369 |
|
|
* arrays and interfaces which mirror methods of Object, nor does it
|
370 |
|
|
* include constructors or the class initialization methods. The Virtual
|
371 |
|
|
* Machine allows multiple methods with the same signature but differing
|
372 |
|
|
* return types; all such methods are in the returned array. A security
|
373 |
|
|
* check may be performed, with
|
374 |
|
|
* <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
|
375 |
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
376 |
|
|
*
|
377 |
|
|
* @return all declared methods in this class
|
378 |
|
|
* @throws SecurityException if the security check fails
|
379 |
|
|
* @since 1.1
|
380 |
|
|
*/
|
381 |
|
|
public native Method[] getDeclaredMethods();
|
382 |
|
|
|
383 |
|
|
/**
|
384 |
|
|
* If this is a nested or inner class, return the class that declared it.
|
385 |
|
|
* If not, return null.
|
386 |
|
|
*
|
387 |
|
|
* @return the declaring class of this class
|
388 |
|
|
* @since 1.1
|
389 |
|
|
*/
|
390 |
|
|
// This is marked as unimplemented in the JCL book.
|
391 |
|
|
public native Class getDeclaringClass ();
|
392 |
|
|
|
393 |
|
|
private native Field getField (String fieldName, int hash)
|
394 |
|
|
throws NoSuchFieldException;
|
395 |
|
|
|
396 |
|
|
/**
|
397 |
|
|
* Get a public field declared or inherited in this class, where name is
|
398 |
|
|
* its simple name. If the class contains multiple accessible fields by
|
399 |
|
|
* that name, an arbitrary one is returned. The implicit length field of
|
400 |
|
|
* arrays is not available. A security check may be performed, with
|
401 |
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
402 |
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
403 |
|
|
*
|
404 |
|
|
* @param fieldName the name of the field
|
405 |
|
|
* @return the field
|
406 |
|
|
* @throws NoSuchFieldException if the field does not exist
|
407 |
|
|
* @throws SecurityException if the security check fails
|
408 |
|
|
* @see #getFields()
|
409 |
|
|
* @since 1.1
|
410 |
|
|
*/
|
411 |
|
|
public Field getField(String fieldName)
|
412 |
|
|
throws NoSuchFieldException
|
413 |
|
|
{
|
414 |
|
|
memberAccessCheck(Member.PUBLIC);
|
415 |
|
|
Field field = getField(fieldName, fieldName.hashCode());
|
416 |
|
|
if (field == null)
|
417 |
|
|
throw new NoSuchFieldException(fieldName);
|
418 |
|
|
return field;
|
419 |
|
|
}
|
420 |
|
|
|
421 |
|
|
/**
|
422 |
|
|
* Get all the public fields declared in this class or inherited from
|
423 |
|
|
* superclasses. This returns an array of length 0 if there are no fields,
|
424 |
|
|
* including for primitive types. This does not return the implicit length
|
425 |
|
|
* field of arrays. A security check may be performed, with
|
426 |
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
427 |
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
428 |
|
|
*
|
429 |
|
|
* @return all public fields in this class
|
430 |
|
|
* @throws SecurityException if the security check fails
|
431 |
|
|
* @since 1.1
|
432 |
|
|
*/
|
433 |
|
|
public Field[] getFields()
|
434 |
|
|
{
|
435 |
|
|
memberAccessCheck(Member.PUBLIC);
|
436 |
|
|
return internalGetFields();
|
437 |
|
|
}
|
438 |
|
|
|
439 |
|
|
/**
|
440 |
|
|
* Like <code>getFields()</code> but without the security checks.
|
441 |
|
|
*/
|
442 |
|
|
private Field[] internalGetFields()
|
443 |
|
|
{
|
444 |
|
|
HashSet set = new HashSet();
|
445 |
|
|
set.addAll(Arrays.asList(getDeclaredFields(true)));
|
446 |
|
|
Class[] interfaces = getInterfaces();
|
447 |
|
|
for (int i = 0; i < interfaces.length; i++)
|
448 |
|
|
set.addAll(Arrays.asList(interfaces[i].internalGetFields()));
|
449 |
|
|
Class superClass = getSuperclass();
|
450 |
|
|
if (superClass != null)
|
451 |
|
|
set.addAll(Arrays.asList(superClass.internalGetFields()));
|
452 |
|
|
return (Field[])set.toArray(new Field[set.size()]);
|
453 |
|
|
}
|
454 |
|
|
|
455 |
|
|
/**
|
456 |
|
|
* Returns the <code>Package</code> in which this class is defined
|
457 |
|
|
* Returns null when this information is not available from the
|
458 |
|
|
* classloader of this class.
|
459 |
|
|
*
|
460 |
|
|
* @return the package for this class, if it is available
|
461 |
|
|
* @since 1.2
|
462 |
|
|
*/
|
463 |
|
|
public Package getPackage()
|
464 |
|
|
{
|
465 |
|
|
ClassLoader cl = getClassLoader();
|
466 |
|
|
if (cl != null)
|
467 |
|
|
return cl.getPackage(getPackagePortion(getName()));
|
468 |
|
|
else
|
469 |
|
|
return VMClassLoader.getPackage(getPackagePortion(getName()));
|
470 |
|
|
}
|
471 |
|
|
|
472 |
|
|
/**
|
473 |
|
|
* Get the interfaces this class <em>directly</em> implements, in the
|
474 |
|
|
* order that they were declared. This returns an empty array, not null,
|
475 |
|
|
* for Object, primitives, void, and classes or interfaces with no direct
|
476 |
|
|
* superinterface. Array types return Cloneable and Serializable.
|
477 |
|
|
*
|
478 |
|
|
* @return the interfaces this class directly implements
|
479 |
|
|
*/
|
480 |
|
|
public native Class[] getInterfaces ();
|
481 |
|
|
|
482 |
|
|
private final native void getSignature(StringBuffer buffer);
|
483 |
|
|
private static final native String getSignature(Class[] args,
|
484 |
|
|
boolean is_construtor);
|
485 |
|
|
|
486 |
|
|
public native Method _getMethod(String methodName, Class[] args);
|
487 |
|
|
|
488 |
|
|
/**
|
489 |
|
|
* Get a public method declared or inherited in this class, where name is
|
490 |
|
|
* its simple name. The implicit methods of Object are not available from
|
491 |
|
|
* interfaces. Constructors (named "<init>" in the class file) and class
|
492 |
|
|
* initializers (name "<clinit>") are not available. The Virtual
|
493 |
|
|
* Machine allows multiple methods with the same signature but differing
|
494 |
|
|
* return types, and the class can inherit multiple methods of the same
|
495 |
|
|
* return type; in such a case the most specific return types are favored,
|
496 |
|
|
* then the final choice is arbitrary. If the method takes no argument, an
|
497 |
|
|
* array of zero elements and null are equivalent for the types argument.
|
498 |
|
|
* A security check may be performed, with
|
499 |
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
500 |
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
501 |
|
|
*
|
502 |
|
|
* @param methodName the name of the method
|
503 |
|
|
* @param types the type of each parameter
|
504 |
|
|
* @return the method
|
505 |
|
|
* @throws NoSuchMethodException if the method does not exist
|
506 |
|
|
* @throws SecurityException if the security check fails
|
507 |
|
|
* @see #getMethods()
|
508 |
|
|
* @since 1.1
|
509 |
|
|
*/
|
510 |
|
|
public Method getMethod(String methodName, Class[] args)
|
511 |
|
|
throws NoSuchMethodException
|
512 |
|
|
{
|
513 |
|
|
memberAccessCheck(Member.PUBLIC);
|
514 |
|
|
|
515 |
|
|
if ("<init>".equals(methodName) || "<clinit>".equals(methodName))
|
516 |
|
|
throw new NoSuchMethodException(methodName);
|
517 |
|
|
|
518 |
|
|
Method method = _getMethod(methodName, args);
|
519 |
|
|
if (method == null)
|
520 |
|
|
throw new NoSuchMethodException(methodName);
|
521 |
|
|
return method;
|
522 |
|
|
}
|
523 |
|
|
|
524 |
|
|
private native int _getMethods (Method[] result, int offset);
|
525 |
|
|
|
526 |
|
|
/**
|
527 |
|
|
* Get all the public methods declared in this class or inherited from
|
528 |
|
|
* superclasses. This returns an array of length 0 if there are no methods,
|
529 |
|
|
* including for primitive types. This does not include the implicit
|
530 |
|
|
* methods of interfaces which mirror methods of Object, nor does it
|
531 |
|
|
* include constructors or the class initialization methods. The Virtual
|
532 |
|
|
* Machine allows multiple methods with the same signature but differing
|
533 |
|
|
* return types; all such methods are in the returned array. A security
|
534 |
|
|
* check may be performed, with
|
535 |
|
|
* <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
|
536 |
|
|
* <code>checkPackageAccess</code> both having to succeed.
|
537 |
|
|
*
|
538 |
|
|
* @return all public methods in this class
|
539 |
|
|
* @throws SecurityException if the security check fails
|
540 |
|
|
* @since 1.1
|
541 |
|
|
*/
|
542 |
|
|
public native Method[] getMethods();
|
543 |
|
|
|
544 |
|
|
/**
|
545 |
|
|
* Get the modifiers of this class. These can be decoded using Modifier,
|
546 |
|
|
* and is limited to one of public, protected, or private, and any of
|
547 |
|
|
* final, static, abstract, or interface. An array class has the same
|
548 |
|
|
* public, protected, or private modifier as its component type, and is
|
549 |
|
|
* marked final but not an interface. Primitive types and void are marked
|
550 |
|
|
* public and final, but not an interface.
|
551 |
|
|
*
|
552 |
|
|
* @return the modifiers of this class
|
553 |
|
|
* @see Modifer
|
554 |
|
|
* @since 1.1
|
555 |
|
|
*/
|
556 |
|
|
public native int getModifiers ();
|
557 |
|
|
|
558 |
|
|
/**
|
559 |
|
|
* Get the name of this class, separated by dots for package separators.
|
560 |
|
|
* If the class represents a primitive type, or void, then the
|
561 |
|
|
* name of the type as it appears in the Java programming language
|
562 |
|
|
* is returned. For instance, <code>Byte.TYPE.getName()</code>
|
563 |
|
|
* returns "byte".
|
564 |
|
|
*
|
565 |
|
|
* Arrays are specially encoded as shown on this table.
|
566 |
|
|
* <pre>
|
567 |
|
|
* array type [<em>element type</em>
|
568 |
|
|
* (note that the element type is encoded per
|
569 |
|
|
* this table)
|
570 |
|
|
* boolean Z
|
571 |
|
|
* byte B
|
572 |
|
|
* char C
|
573 |
|
|
* short S
|
574 |
|
|
* int I
|
575 |
|
|
* long J
|
576 |
|
|
* float F
|
577 |
|
|
* double D
|
578 |
|
|
* void V
|
579 |
|
|
* class or interface, alone: <dotted name>
|
580 |
|
|
* class or interface, as element type: L<dotted name>;
|
581 |
|
|
* </pre>
|
582 |
|
|
*
|
583 |
|
|
* @return the name of this class
|
584 |
|
|
*/
|
585 |
|
|
public native String getName ();
|
586 |
|
|
|
587 |
|
|
/**
|
588 |
|
|
* Get a resource URL using this class's package using the
|
589 |
|
|
* getClassLoader().getResource() method. If this class was loaded using
|
590 |
|
|
* the system classloader, ClassLoader.getSystemResource() is used instead.
|
591 |
|
|
*
|
592 |
|
|
* <p>If the name you supply is absolute (it starts with a <code>/</code>),
|
593 |
|
|
* then the leading <code>/</code> is removed and it is passed on to
|
594 |
|
|
* getResource(). If it is relative, the package name is prepended, and
|
595 |
|
|
* <code>.</code>'s are replaced with <code>/</code>.
|
596 |
|
|
*
|
597 |
|
|
* <p>The URL returned is system- and classloader-dependent, and could
|
598 |
|
|
* change across implementations.
|
599 |
|
|
*
|
600 |
|
|
* @param resourceName the name of the resource, generally a path
|
601 |
|
|
* @return the URL to the resource
|
602 |
|
|
* @throws NullPointerException if name is null
|
603 |
|
|
* @since 1.1
|
604 |
|
|
*/
|
605 |
|
|
public URL getResource(String resourceName)
|
606 |
|
|
{
|
607 |
|
|
String name = resourcePath(resourceName);
|
608 |
|
|
ClassLoader loader = getClassLoader();
|
609 |
|
|
if (loader == null)
|
610 |
|
|
return ClassLoader.getSystemResource(name);
|
611 |
|
|
return loader.getResource(name);
|
612 |
|
|
}
|
613 |
|
|
|
614 |
|
|
/**
|
615 |
|
|
* Get a resource using this class's package using the
|
616 |
|
|
* getClassLoader().getResourceAsStream() method. If this class was loaded
|
617 |
|
|
* using the system classloader, ClassLoader.getSystemResource() is used
|
618 |
|
|
* instead.
|
619 |
|
|
*
|
620 |
|
|
* <p>If the name you supply is absolute (it starts with a <code>/</code>),
|
621 |
|
|
* then the leading <code>/</code> is removed and it is passed on to
|
622 |
|
|
* getResource(). If it is relative, the package name is prepended, and
|
623 |
|
|
* <code>.</code>'s are replaced with <code>/</code>.
|
624 |
|
|
*
|
625 |
|
|
* <p>The URL returned is system- and classloader-dependent, and could
|
626 |
|
|
* change across implementations.
|
627 |
|
|
*
|
628 |
|
|
* @param resourceName the name of the resource, generally a path
|
629 |
|
|
* @return an InputStream with the contents of the resource in it, or null
|
630 |
|
|
* @throws NullPointerException if name is null
|
631 |
|
|
* @since 1.1
|
632 |
|
|
*/
|
633 |
|
|
public InputStream getResourceAsStream(String resourceName)
|
634 |
|
|
{
|
635 |
|
|
String name = resourcePath(resourceName);
|
636 |
|
|
ClassLoader loader = getClassLoader();
|
637 |
|
|
if (loader == null)
|
638 |
|
|
return ClassLoader.getSystemResourceAsStream(name);
|
639 |
|
|
return loader.getResourceAsStream(name);
|
640 |
|
|
}
|
641 |
|
|
|
642 |
|
|
private String resourcePath(String resourceName)
|
643 |
|
|
{
|
644 |
|
|
if (resourceName.length() > 0)
|
645 |
|
|
{
|
646 |
|
|
if (resourceName.charAt(0) != '/')
|
647 |
|
|
{
|
648 |
|
|
String pkg = getPackagePortion(getName());
|
649 |
|
|
if (pkg.length() > 0)
|
650 |
|
|
resourceName = pkg.replace('.','/') + '/' + resourceName;
|
651 |
|
|
}
|
652 |
|
|
else
|
653 |
|
|
{
|
654 |
|
|
resourceName = resourceName.substring(1);
|
655 |
|
|
}
|
656 |
|
|
}
|
657 |
|
|
return resourceName;
|
658 |
|
|
}
|
659 |
|
|
|
660 |
|
|
/**
|
661 |
|
|
* Get the signers of this class. This returns null if there are no signers,
|
662 |
|
|
* such as for primitive types or void.
|
663 |
|
|
*
|
664 |
|
|
* @return the signers of this class
|
665 |
|
|
* @since 1.1
|
666 |
|
|
*/
|
667 |
|
|
public native Object[] getSigners ();
|
668 |
|
|
|
669 |
|
|
/**
|
670 |
|
|
* Set the signers of this class.
|
671 |
|
|
*
|
672 |
|
|
* @param signers the signers of this class
|
673 |
|
|
*/
|
674 |
|
|
native void setSigners(Object[] signers);
|
675 |
|
|
|
676 |
|
|
/**
|
677 |
|
|
* Get the direct superclass of this class. If this is an interface,
|
678 |
|
|
* Object, a primitive type, or void, it will return null. If this is an
|
679 |
|
|
* array type, it will return Object.
|
680 |
|
|
*
|
681 |
|
|
* @return the direct superclass of this class
|
682 |
|
|
*/
|
683 |
|
|
public native Class getSuperclass ();
|
684 |
|
|
|
685 |
|
|
/**
|
686 |
|
|
* Return whether this class is an array type.
|
687 |
|
|
*
|
688 |
|
|
* @return whether this class is an array type
|
689 |
|
|
* @since 1.1
|
690 |
|
|
*/
|
691 |
|
|
public native boolean isArray ();
|
692 |
|
|
|
693 |
|
|
/**
|
694 |
|
|
* Discover whether an instance of the Class parameter would be an
|
695 |
|
|
* instance of this Class as well. Think of doing
|
696 |
|
|
* <code>isInstance(c.newInstance())</code> or even
|
697 |
|
|
* <code>c.newInstance() instanceof (this class)</code>. While this
|
698 |
|
|
* checks widening conversions for objects, it must be exact for primitive
|
699 |
|
|
* types.
|
700 |
|
|
*
|
701 |
|
|
* @param c the class to check
|
702 |
|
|
* @return whether an instance of c would be an instance of this class
|
703 |
|
|
* as well
|
704 |
|
|
* @throws NullPointerException if c is null
|
705 |
|
|
* @since 1.1
|
706 |
|
|
*/
|
707 |
|
|
public native boolean isAssignableFrom (Class c);
|
708 |
|
|
|
709 |
|
|
/**
|
710 |
|
|
* Discover whether an Object is an instance of this Class. Think of it
|
711 |
|
|
* as almost like <code>o instanceof (this class)</code>.
|
712 |
|
|
*
|
713 |
|
|
* @param o the Object to check
|
714 |
|
|
* @return whether o is an instance of this class
|
715 |
|
|
* @since 1.1
|
716 |
|
|
*/
|
717 |
|
|
public native boolean isInstance (Object o);
|
718 |
|
|
|
719 |
|
|
/**
|
720 |
|
|
* Check whether this class is an interface or not. Array types are not
|
721 |
|
|
* interfaces.
|
722 |
|
|
*
|
723 |
|
|
* @return whether this class is an interface or not
|
724 |
|
|
*/
|
725 |
|
|
public native boolean isInterface ();
|
726 |
|
|
|
727 |
|
|
/**
|
728 |
|
|
* Return whether this class is a primitive type. A primitive type class
|
729 |
|
|
* is a class representing a kind of "placeholder" for the various
|
730 |
|
|
* primitive types, or void. You can access the various primitive type
|
731 |
|
|
* classes through java.lang.Boolean.TYPE, java.lang.Integer.TYPE, etc.,
|
732 |
|
|
* or through boolean.class, int.class, etc.
|
733 |
|
|
*
|
734 |
|
|
* @return whether this class is a primitive type
|
735 |
|
|
* @see Boolean#TYPE
|
736 |
|
|
* @see Byte#TYPE
|
737 |
|
|
* @see Character#TYPE
|
738 |
|
|
* @see Short#TYPE
|
739 |
|
|
* @see Integer#TYPE
|
740 |
|
|
* @see Long#TYPE
|
741 |
|
|
* @see Float#TYPE
|
742 |
|
|
* @see Double#TYPE
|
743 |
|
|
* @see Void#TYPE
|
744 |
|
|
* @since 1.1
|
745 |
|
|
*/
|
746 |
|
|
public native boolean isPrimitive ();
|
747 |
|
|
|
748 |
|
|
/**
|
749 |
|
|
* Get a new instance of this class by calling the no-argument constructor.
|
750 |
|
|
* The class is initialized if it has not been already. A security check
|
751 |
|
|
* may be performed, with <code>checkMemberAccess(this, Member.PUBLIC)</code>
|
752 |
|
|
* as well as <code>checkPackageAccess</code> both having to succeed.
|
753 |
|
|
*
|
754 |
|
|
* @return a new instance of this class
|
755 |
|
|
* @throws InstantiationException if there is not a no-arg constructor
|
756 |
|
|
* for this class, including interfaces, abstract classes, arrays,
|
757 |
|
|
* primitive types, and void; or if an exception occurred during
|
758 |
|
|
* the constructor
|
759 |
|
|
* @throws IllegalAccessException if you are not allowed to access the
|
760 |
|
|
* no-arg constructor because of scoping reasons
|
761 |
|
|
* @throws SecurityException if the security check fails
|
762 |
|
|
* @throws ExceptionInInitializerError if class initialization caused by
|
763 |
|
|
* this call fails with an exception
|
764 |
|
|
*/
|
765 |
|
|
public native Object newInstance ()
|
766 |
|
|
throws InstantiationException, IllegalAccessException;
|
767 |
|
|
|
768 |
|
|
// We need a native method to retrieve the protection domain, because we
|
769 |
|
|
// can't add fields to java.lang.Class that are accessible from Java.
|
770 |
|
|
private native ProtectionDomain getProtectionDomain0();
|
771 |
|
|
|
772 |
|
|
/**
|
773 |
|
|
* Returns the protection domain of this class. If the classloader did not
|
774 |
|
|
* record the protection domain when creating this class the unknown
|
775 |
|
|
* protection domain is returned which has a <code>null</code> code source
|
776 |
|
|
* and all permissions. A security check may be performed, with
|
777 |
|
|
* <code>RuntimePermission("getProtectionDomain")</code>.
|
778 |
|
|
*
|
779 |
|
|
* @return the protection domain
|
780 |
|
|
* @throws SecurityException if the security manager exists and the caller
|
781 |
|
|
* does not have <code>RuntimePermission("getProtectionDomain")</code>.
|
782 |
|
|
* @see RuntimePermission
|
783 |
|
|
* @since 1.2
|
784 |
|
|
*/
|
785 |
|
|
public ProtectionDomain getProtectionDomain()
|
786 |
|
|
{
|
787 |
|
|
SecurityManager sm = System.getSecurityManager();
|
788 |
|
|
if (sm != null)
|
789 |
|
|
sm.checkPermission(VMClassLoader.protectionDomainPermission);
|
790 |
|
|
|
791 |
|
|
ProtectionDomain protectionDomain = getProtectionDomain0();
|
792 |
|
|
|
793 |
|
|
if (protectionDomain == null)
|
794 |
|
|
return VMClassLoader.unknownProtectionDomain;
|
795 |
|
|
else
|
796 |
|
|
return protectionDomain;
|
797 |
|
|
}
|
798 |
|
|
|
799 |
|
|
/**
|
800 |
|
|
* Return the human-readable form of this Object. For an object, this
|
801 |
|
|
* is either "interface " or "class " followed by <code>getName()</code>,
|
802 |
|
|
* for primitive types and void it is just <code>getName()</code>.
|
803 |
|
|
*
|
804 |
|
|
* @return the human-readable form of this Object
|
805 |
|
|
*/
|
806 |
|
|
public String toString()
|
807 |
|
|
{
|
808 |
|
|
if (isPrimitive())
|
809 |
|
|
return getName();
|
810 |
|
|
return (isInterface() ? "interface " : "class ") + getName();
|
811 |
|
|
}
|
812 |
|
|
|
813 |
|
|
/**
|
814 |
|
|
* Returns the desired assertion status of this class, if it were to be
|
815 |
|
|
* initialized at this moment. The class assertion status, if set, is
|
816 |
|
|
* returned; the backup is the default package status; then if there is
|
817 |
|
|
* a class loader, that default is returned; and finally the system default
|
818 |
|
|
* is returned. This method seldom needs calling in user code, but exists
|
819 |
|
|
* for compilers to implement the assert statement. Note that there is no
|
820 |
|
|
* guarantee that the result of this method matches the class's actual
|
821 |
|
|
* assertion status.
|
822 |
|
|
*
|
823 |
|
|
* @return the desired assertion status
|
824 |
|
|
* @see ClassLoader#setClassAssertionStatus(String, boolean)
|
825 |
|
|
* @see ClassLoader#setPackageAssertionStatus(String, boolean)
|
826 |
|
|
* @see ClassLoader#setDefaultAssertionStatus(boolean)
|
827 |
|
|
* @since 1.4
|
828 |
|
|
*/
|
829 |
|
|
public boolean desiredAssertionStatus()
|
830 |
|
|
{
|
831 |
|
|
ClassLoader c = getClassLoader();
|
832 |
|
|
Object status;
|
833 |
|
|
if (c == null)
|
834 |
|
|
return VMClassLoader.defaultAssertionStatus();
|
835 |
|
|
if (c.classAssertionStatus != null)
|
836 |
|
|
synchronized (c)
|
837 |
|
|
{
|
838 |
|
|
status = c.classAssertionStatus.get(getName());
|
839 |
|
|
if (status != null)
|
840 |
|
|
return status.equals(Boolean.TRUE);
|
841 |
|
|
}
|
842 |
|
|
else
|
843 |
|
|
{
|
844 |
|
|
status = ClassLoader.systemClassAssertionStatus.get(getName());
|
845 |
|
|
if (status != null)
|
846 |
|
|
return status.equals(Boolean.TRUE);
|
847 |
|
|
}
|
848 |
|
|
if (c.packageAssertionStatus != null)
|
849 |
|
|
synchronized (c)
|
850 |
|
|
{
|
851 |
|
|
String name = getPackagePortion(getName());
|
852 |
|
|
if ("".equals(name))
|
853 |
|
|
status = c.packageAssertionStatus.get(null);
|
854 |
|
|
else
|
855 |
|
|
do
|
856 |
|
|
{
|
857 |
|
|
status = c.packageAssertionStatus.get(name);
|
858 |
|
|
name = getPackagePortion(name);
|
859 |
|
|
}
|
860 |
|
|
while (! "".equals(name) && status == null);
|
861 |
|
|
if (status != null)
|
862 |
|
|
return status.equals(Boolean.TRUE);
|
863 |
|
|
}
|
864 |
|
|
else
|
865 |
|
|
{
|
866 |
|
|
String name = getPackagePortion(getName());
|
867 |
|
|
if ("".equals(name))
|
868 |
|
|
status = ClassLoader.systemPackageAssertionStatus.get(null);
|
869 |
|
|
else
|
870 |
|
|
do
|
871 |
|
|
{
|
872 |
|
|
status = ClassLoader.systemPackageAssertionStatus.get(name);
|
873 |
|
|
name = getPackagePortion(name);
|
874 |
|
|
}
|
875 |
|
|
while (! "".equals(name) && status == null);
|
876 |
|
|
if (status != null)
|
877 |
|
|
return status.equals(Boolean.TRUE);
|
878 |
|
|
}
|
879 |
|
|
return c.defaultAssertionStatus;
|
880 |
|
|
}
|
881 |
|
|
|
882 |
|
|
/**
|
883 |
|
|
* Strip the last portion of the name (after the last dot).
|
884 |
|
|
*
|
885 |
|
|
* @param name the name to get package of
|
886 |
|
|
* @return the package name, or "" if no package
|
887 |
|
|
*/
|
888 |
|
|
private static String getPackagePortion(String name)
|
889 |
|
|
{
|
890 |
|
|
int lastInd = name.lastIndexOf('.');
|
891 |
|
|
if (lastInd == -1)
|
892 |
|
|
return "";
|
893 |
|
|
return name.substring(0, lastInd);
|
894 |
|
|
}
|
895 |
|
|
|
896 |
|
|
/**
|
897 |
|
|
* Perform security checks common to all of the methods that
|
898 |
|
|
* get members of this Class.
|
899 |
|
|
*/
|
900 |
|
|
private void memberAccessCheck(int which)
|
901 |
|
|
{
|
902 |
|
|
SecurityManager sm = System.getSecurityManager();
|
903 |
|
|
if (sm != null)
|
904 |
|
|
{
|
905 |
|
|
sm.checkMemberAccess(this, which);
|
906 |
|
|
Package pkg = getPackage();
|
907 |
|
|
if (pkg != null)
|
908 |
|
|
sm.checkPackageAccess(pkg.getName());
|
909 |
|
|
}
|
910 |
|
|
}
|
911 |
|
|
}
|