aoqi@0: /*
aoqi@0:  * Copyright (c) 1998, 2007, 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: 
aoqi@0: /*
aoqi@0:  * Licensed Materials - Property of IBM
aoqi@0:  * RMI-IIOP v1.0
aoqi@0:  * Copyright IBM Corp. 1998 1999  All Rights Reserved
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: package sun.rmi.rmic.iiop;
aoqi@0: 
aoqi@0: import java.util.Hashtable;
aoqi@0: import java.io.File;
aoqi@0: import java.io.FileInputStream;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * DirectoryLoader is a simple ClassLoader which loads from a specified
aoqi@0:  * file system directory.
aoqi@0:  * @author Bryan Atsatt
aoqi@0:  */
aoqi@0: 
aoqi@0: public class DirectoryLoader extends ClassLoader {
aoqi@0: 
aoqi@0:     private Hashtable cache;
aoqi@0:     private File root;
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Constructor.
aoqi@0:      */
aoqi@0:     public DirectoryLoader (File rootDir) {
aoqi@0:         cache = new Hashtable();
aoqi@0:         if (rootDir == null || !rootDir.isDirectory()) {
aoqi@0:             throw new IllegalArgumentException();
aoqi@0:         }
aoqi@0:         root = rootDir;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private DirectoryLoader () {}
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Convenience version of loadClass which sets 'resolve' == true.
aoqi@0:      */
aoqi@0:     public Class loadClass(String className) throws ClassNotFoundException {
aoqi@0:         return loadClass(className, true);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * This is the required version of loadClass which is called
aoqi@0:      * both from loadClass above and from the internal function
aoqi@0:      * FindClassFromClass.
aoqi@0:      */
aoqi@0:     public synchronized Class loadClass(String className, boolean resolve)
aoqi@0:         throws ClassNotFoundException {
aoqi@0:         Class result;
aoqi@0:         byte  classData[];
aoqi@0: 
aoqi@0:         // Do we already have it in the cache?
aoqi@0: 
aoqi@0:         result = (Class) cache.get(className);
aoqi@0: 
aoqi@0:         if (result == null) {
aoqi@0: 
aoqi@0:             // Nope, can we get if from the system class loader?
aoqi@0: 
aoqi@0:             try {
aoqi@0: 
aoqi@0:                 result = super.findSystemClass(className);
aoqi@0: 
aoqi@0:             } catch (ClassNotFoundException e) {
aoqi@0: 
aoqi@0:                 // No, so try loading it...
aoqi@0: 
aoqi@0:                 classData = getClassFileData(className);
aoqi@0: 
aoqi@0:                 if (classData == null) {
aoqi@0:                     throw new ClassNotFoundException();
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 // Parse the class file data...
aoqi@0: 
aoqi@0:                 result = defineClass(classData, 0, classData.length);
aoqi@0: 
aoqi@0:                 if (result == null) {
aoqi@0:                     throw new ClassFormatError();
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 // Resolve it...
aoqi@0: 
aoqi@0:                 if (resolve) resolveClass(result);
aoqi@0: 
aoqi@0:                 // Add to cache...
aoqi@0: 
aoqi@0:                 cache.put(className, result);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Reurn a byte array containing the contents of the class file.  Returns null
aoqi@0:      * if an exception occurs.
aoqi@0:      */
aoqi@0:     private byte[] getClassFileData (String className) {
aoqi@0: 
aoqi@0:         byte result[] = null;
aoqi@0:         FileInputStream stream = null;
aoqi@0: 
aoqi@0:         // Get the file...
aoqi@0: 
aoqi@0:         File classFile = new File(root,className.replace('.',File.separatorChar) + ".class");
aoqi@0: 
aoqi@0:         // Now get the bits...
aoqi@0: 
aoqi@0:         try {
aoqi@0:             stream = new FileInputStream(classFile);
aoqi@0:             result = new byte[stream.available()];
aoqi@0:             stream.read(result);
aoqi@0:         } catch(ThreadDeath death) {
aoqi@0:             throw death;
aoqi@0:         } catch (Throwable e) {
aoqi@0:         }
aoqi@0: 
aoqi@0:         finally {
aoqi@0:             if (stream != null) {
aoqi@0:                 try {
aoqi@0:                     stream.close();
aoqi@0:                 } catch(ThreadDeath death) {
aoqi@0:                     throw death;
aoqi@0:                 } catch (Throwable e) {
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: }