169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/* 269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Javassist, a Java-bytecode translator toolkit. 369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved. 469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * The contents of this file are subject to the Mozilla Public License Version 669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1.1 (the "License"); you may not use this file except in compliance with 769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the License. Alternatively, the contents of this file may be used under 869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the terms of the GNU Lesser General Public License Version 2.1 or later. 969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Software distributed under the License is distributed on an "AS IS" basis, 1169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 1269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * for the specific language governing rights and limitations under the 1369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * License. 1469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 1569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 1669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpackage javassist; 1769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 1869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalimport java.io.InputStream; 1969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalimport java.net.URL; 2069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 2169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/** 2269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * A search-path for obtaining a class file 2369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * by <code>getResourceAsStream()</code> in <code>java.lang.Class</code>. 2469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 2569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * <p>Try adding a <code>ClassClassPath</code> when a program is running 2669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * with a user-defined class loader and any class files are not found with 2769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the default <code>ClassPool</code>. For example, 2869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 2969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * <ul><pre> 3069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * ClassPool cp = ClassPool.getDefault(); 3169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * cp.insertClassPath(new ClassClassPath(this.getClass())); 3269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * </pre></ul> 3369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 3469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * This code snippet permanently adds a <code>ClassClassPath</code> 3569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * to the default <code>ClassPool</code>. Note that the default 3669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * <code>ClassPool</code> is a singleton. The added 3769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * <code>ClassClassPath</code> uses a class object representing 3869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the class including the code snippet above. 3969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 4069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @see ClassPool#insertClassPath(ClassPath) 4169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @see ClassPool#appendClassPath(ClassPath) 4269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @see LoaderClassPath 4369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 4469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpublic class ClassClassPath implements ClassPath { 4569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal private Class thisClass; 4669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 4769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** Creates a search path. 4869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 4969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @param c the <code>Class</code> object used to obtain a class 5069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * file. <code>getResourceAsStream()</code> is called on 5169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * this object. 5269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 5369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public ClassClassPath(Class c) { 5469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal thisClass = c; 5569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 5669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 5769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal ClassClassPath() { 5869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /* The value of thisClass was this.getClass() in early versions: 5969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 6069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * thisClass = this.getClass(); 6169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 6269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * However, this made openClassfile() not search all the system 6369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * class paths if javassist.jar is put in jre/lib/ext/ 6469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * (with JDK1.4). 6569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 6669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal this(java.lang.Object.class); 6769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 6869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 6969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 7069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Obtains a class file by <code>getResourceAsStream()</code>. 7169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 7269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public InputStream openClassfile(String classname) { 7369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal String jarname = "/" + classname.replace('.', '/') + ".class"; 7469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return thisClass.getResourceAsStream(jarname); 7569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 7669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 7769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 7869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Obtains the URL of the specified class file. 7969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 8069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @return null if the class file could not be found. 8169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 8269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public URL find(String classname) { 8369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal String jarname = "/" + classname.replace('.', '/') + ".class"; 8469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return thisClass.getResource(jarname); 8569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 8669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 8769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 8869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Does nothing. 8969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 9069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public void close() { 9169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 9269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 9369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public String toString() { 9469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return thisClass.getName() + ".class"; 9569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 9669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal} 97