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- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999-2006 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.
- *
- * 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.
- *
- * <p>It is used for obtaining a class file from the given
- * class loader by <code>getResourceAsStream()</code>.
- * The <code>LoaderClassPath</code> refers to the class loader through
- * <code>WeakReference</code>. If the class loader is garbage collected,
- * the other search pathes are examined.
- *
- * <p>The given class loader must have both <code>getResourceAsStream()</code>
- * and <code>getResource()</code>.
- *
- * @author <a href="mailto:bill@jboss.org">Bill Burke</a>
- * @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 ? "<null>" : cl.toString();
- }
-
- /**
- * Obtains a class file from the class loader.
- * This method calls <code>getResourceAsStream(String)</code>
- * 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 <code>getResource(String)</code>
- * 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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