/* * 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.lang.ref.Reference; import java.lang.ref.WeakReference; import java.net.URL; /** * 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(). * *

Class files in a named module are private to that module. * This method cannot obtain class files in named modules. *

* * @author Bill Burke * @author Shigeru Chiba * * @see ClassPool#insertClassPath(ClassPath) * @see ClassPool#appendClassPath(ClassPath) * @see ClassClassPath */ public class LoaderClassPath implements ClassPath { private Reference clref; /** * Creates a search path representing a class loader. */ public LoaderClassPath(ClassLoader cl) { clref = new WeakReference(cl); } @Override public String toString() { return clref.get() == null ? "" : clref.get().toString(); } /** * Obtains a class file from the class loader. * This method calls getResourceAsStream(String) * on the class loader. */ @Override public InputStream openClassfile(String classname) throws NotFoundException { String cname = classname.replace('.', '/') + ".class"; ClassLoader cl = clref.get(); if (cl == null) return null; // not found InputStream is = cl.getResourceAsStream(cname); return is; } /** * 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. */ @Override public URL find(String classname) { String cname = classname.replace('.', '/') + ".class"; ClassLoader cl = clref.get(); if (cl == null) return null; // not found URL url = cl.getResource(cname); return url; } }