/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.hook.impl;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.StringTokenizer;
import sun.misc.Resource;
import sun.misc.URLClassPath;
/**
* Very basic classloader that do online weaving.
* <p/>
* This classloader can be used thru several means <ul> <li>as a URLClassLoader in a custom development</li> <li>as a
* <i>MainClass</i> to allow on the fly weaving (without support for classloader hierarchy)</li> </ul> It can also be
* used for debugging step by step in any IDE
*
* @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur</a>
* @todo rewrite based on SUN src (definePackage missing)
*/
public class WeavingClassLoader extends URLClassLoader {
public WeavingClassLoader(URL[] urls, ClassLoader parent) {
super(urls, parent);
}
protected Class findClass(String name) throws ClassNotFoundException {
String path = name.replace('.', '/').concat(".class");
Resource res = new URLClassPath(getURLs()).getResource(path, false);
if (res != null) {
//definePackage(name.substring(0, name.lastIndexOf(".")), null, null);
try {
byte[] b = res.getBytes();
byte[] transformed = ClassPreProcessorHelper.defineClass0Pre(this, name, b, 0, b.length, null);
return defineClass(name, transformed, 0, transformed.length);
}
catch (IOException e) {
throw new ClassNotFoundException(e.getMessage());
}
}
else {
throw new ClassNotFoundException(name);
}
}
public static void main(String args[]) throws Exception {
String path = System.getProperty("java.class.path");
ArrayList paths = new ArrayList();
StringTokenizer st = new StringTokenizer(path, File.pathSeparator);
while (st.hasMoreTokens()) {
paths.add((new File(st.nextToken())).getCanonicalFile().toURL());
}
//System.setProperty("aspectwerkz.transform.verbose", "yes");
//System.setProperty("aspectwerkz.transform.dump", "*");
//System.setProperty("aspectwerkz.definition.file", "...");
//@todo check child of extension classloader instead of boot classloader
ClassLoader cl = new WeavingClassLoader(
(URL[])paths.toArray(new URL[]{}), ClassLoader.getSystemClassLoader().getParent()
);
Thread.currentThread().setContextClassLoader(cl);
String s = args[0];
String args1[] = new String[args.length - 1];
if (args1.length > 0) {
System.arraycopy(args, 1, args1, 0, args.length - 1);
}
Class class1 = cl.loadClass(s);
Method method = class1.getMethod("main", new Class[]{String[].class});
method.invoke(null, new Object[]{args1});
}
}