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