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/*
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* Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.rmi.rmic.iiop;
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import java.io.*;
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import sun.tools.java.ClassPath ;
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import sun.tools.java.ClassFile ;
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/**
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* A ClassLoader that will ultimately use a given sun.tools.java.ClassPath to
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* find the desired file. This works for any JAR files specified in the given
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* ClassPath as well -- reusing all of that wonderful sun.tools.java code.
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*
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*@author Everett Anderson
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*/
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public class ClassPathLoader extends ClassLoader
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{
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private ClassPath classPath;
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public ClassPathLoader(ClassPath classPath) {
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this.classPath = classPath;
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}
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// Called by the super class
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protected Class findClass(String name) throws ClassNotFoundException
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{
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byte[] b = loadClassData(name);
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return defineClass(name, b, 0, b.length);
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}
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/**
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* Load the class with the given fully qualified name from the ClassPath.
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*/
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private byte[] loadClassData(String className)
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throws ClassNotFoundException
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{
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// Build the file name and subdirectory from the
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// class name
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String filename = className.replace('.', File.separatorChar)
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+ ".class";
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// Have ClassPath find the file for us, and wrap it in a
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// ClassFile. Note: This is where it looks inside jar files that
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// are specified in the path.
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ClassFile classFile = classPath.getFile(filename);
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if (classFile != null) {
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// Provide the most specific reason for failure in addition
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// to ClassNotFound
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Exception reportedError = null;
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byte data[] = null;
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try {
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// ClassFile is beautiful because it shields us from
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// knowing if it's a separate file or an entry in a
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// jar file.
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DataInputStream input
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= new DataInputStream(classFile.getInputStream());
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// Can't rely on input available() since it will be
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// something unusual if it's a jar file! May need
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// to worry about a possible problem if someone
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// makes a jar file entry with a size greater than
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// max int.
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data = new byte[(int)classFile.length()];
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try {
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input.readFully(data);
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} catch (IOException ex) {
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// Something actually went wrong reading the file. This
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// is a real error so save it to report it.
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data = null;
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reportedError = ex;
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} finally {
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// Just don't care if there's an exception on close!
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// I hate that close can throw an IOException!
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try { input.close(); } catch (IOException ex) {}
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}
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} catch (IOException ex) {
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// Couldn't get the input stream for the file. This is
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// probably also a real error.
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reportedError = ex;
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}
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if (data == null)
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throw new ClassNotFoundException(className, reportedError);
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return data;
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}
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// Couldn't find the file in the class path.
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throw new ClassNotFoundException(className);
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}
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}
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