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The source code// $Id: ArgoClassLoader.java,v 1.5 2004/09/11 09:25:57 mvw Exp $ // Copyright (c) 1996-2001 The Regents of the University of California. All // Rights Reserved. Permission to use, copy, modify, and distribute this // software and its documentation without fee, and without a written // agreement is hereby granted, provided that the above copyright notice // and this paragraph appear in all copies. This software program and // documentation are copyrighted by The Regents of the University of // California. The software program and documentation are supplied "AS // IS", without any accompanying services from The Regents. The Regents // does not warrant that the operation of the program will be // uninterrupted or error-free. The end-user understands that the program // was developed for research purposes and is advised not to rely // exclusively on the program for any reason. IN NO EVENT SHALL THE // UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, // SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, // ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF // THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF // SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE // PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF // CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, // UPDATES, ENHANCEMENTS, OR MODIFICATIONS. package org.argouml.application.security; import java.util.jar.JarFile; import java.util.jar.JarEntry; import java.io.DataInputStream; /** Argo custom classloader. * * Much of the code that this is based upon is taken from the * O'reilly book TODO:. * * @author Thierry Lach * @since 0.9.4 */ public final class ArgoClassLoader extends ClassLoader { private JarFile jf = null; /** * The constructor. * * @param jarfile the jar to be loaded */ public ArgoClassLoader (JarFile jarfile) { jf = jarfile; } /** The worker for this classloader. * * @see java.lang.ClassLoader#loadClass(java.lang.String) */ public Class loadClass(String classname) throws ClassNotFoundException { try { // The standard classloader caches classes. Look there first. Class c = findLoadedClass(classname); // And other standard places. If a class is loaded with // a classloader, the same classloader will be called // to load all of the superclasses. These may not be in // the same place as the class is loaded from. if (c == null) { try { c = findSystemClass(classname); } catch (Exception e) { } } // If we still haven't found it, then it must be up to us. if (c == null) { // See if the class is in the jarfile JarEntry je = jf.getJarEntry(classname + ".class"); int entrylength = (int) je.getSize(); DataInputStream di = new DataInputStream(jf.getInputStream(je)); byte[] classbytes = new byte[entrylength]; di.readFully(classbytes); di.close(); c = defineClass(classname, classbytes, 0, entrylength); } return c; } catch (Exception e) { throw new ClassNotFoundException(e.toString()); } } } |
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