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/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist;

import java.io.InputStream;
import java.net.URL;
import java.lang.ref.WeakReference;

/**
 * A class search-path representing a class loader.
 *
 * 

It is used for obtaining a class file from the given * class loader by getResourceAsStream(). * The LoaderClassPath refers to the class loader through * WeakReference. If the class loader is garbage collected, * the other search pathes are examined. * *

The given class loader must have both getResourceAsStream() * and getResource(). * * @author Bill Burke * @author Shigeru Chiba * * @see ClassPool#insertClassPath(ClassPath) * @see ClassPool#appendClassPath(ClassPath) * @see ClassClassPath */ public class LoaderClassPath implements ClassPath { private WeakReference clref; /** * Creates a search path representing a class loader. */ public LoaderClassPath(ClassLoader cl) { clref = new WeakReference(cl); } public String toString() { Object cl = null; if (clref != null) cl = clref.get(); return cl == null ? "" : cl.toString(); } /** * Obtains a class file from the class loader. * This method calls getResourceAsStream(String) * on the class loader. */ public InputStream openClassfile(String classname) { String cname = classname.replace('.', '/') + ".class"; ClassLoader cl = (ClassLoader)clref.get(); if (cl == null) return null; // not found else return cl.getResourceAsStream(cname); } /** * Obtains the URL of the specified class file. * This method calls getResource(String) * on the class loader. * * @return null if the class file could not be found. */ public URL find(String classname) { String cname = classname.replace('.', '/') + ".class"; ClassLoader cl = (ClassLoader)clref.get(); if (cl == null) return null; // not found else return cl.getResource(cname); } /** * Closes this class path. */ public void close() { clref = null; } }





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