/*******************************************************************************
* Copyright 2009, 2010 Innovation Gate GmbH. All Rights Reserved.
*
* This file is part of the OpenWGA server platform.
*
* OpenWGA is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* In addition, a special exception is granted by the copyright holders
* of OpenWGA called "OpenWGA plugin exception". You should have received
* a copy of this exception along with OpenWGA in file COPYING.
* If not, see <http://www.openwga.com/gpl-plugin-exception>.
*
* OpenWGA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenWGA in file COPYING.
* If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
package de.innovationgate.wgpublisher.expressions.tmlscript;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.AllPermission;
import java.security.CodeSource;
import java.security.PermissionCollection;
import java.security.Permissions;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import org.apache.commons.collections.iterators.IteratorEnumeration;
public class IsolatedJARLoader extends URLClassLoader {
private ClassLoader _fallBackLoader = null;
public IsolatedJARLoader(URL[] urlsToJars, ClassLoader fallbackLoader) {
super(urlsToJars, null);
_fallBackLoader = fallbackLoader;
}
/* (Kein Javadoc)
* @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
*/
public synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
Class clazz = findLoadedClass(name);
if (clazz == null) {
try {
clazz = super.loadClass(name, false);
}
catch (ClassNotFoundException e) {
}
}
if (clazz == null) {
clazz = _fallBackLoader.loadClass(name);
}
if (clazz != null && resolve) {
resolveClass(clazz);
}
return clazz;
}
@Override
public URL findResource(String name) {
URL res = super.findResource(name);
if (res == null) {
res = _fallBackLoader.getResource(name);
}
return res;
}
@Override
public Enumeration<URL> findResources(String s) throws IOException {
List<URL> urls = new ArrayList<URL>();
urls.addAll(Collections.list(super.findResources(s)));
urls.addAll(Collections.list(_fallBackLoader.getResources(s)));
return new IteratorEnumeration(urls.iterator());
}
@Override
protected PermissionCollection getPermissions(CodeSource arg0) {
Permissions permissions = new Permissions();
permissions.add(new AllPermission());
return permissions;
}
}