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