/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: lobochief@users.sourceforge.net
*/
/*
* Created on Jun 19, 2005
*/
package org.lobobrowser.util;
import java.net.URL;
import java.util.Collection;
/**
* @author J. H. S.
*/
public class MultiplexClassLoader extends BaseClassLoader {
private static final ClassLoader[] EMPTY_CLASS_LOADERS = new ClassLoader[0];
private final ClassLoader[] parentLoaders;
/**
* @param parent
*/
public MultiplexClassLoader(final Collection<ClassLoader> classLoaders) {
super(null);
// TODO: Check why input parameter is not being used
this.parentLoaders = classLoaders.toArray(EMPTY_CLASS_LOADERS);
}
/*
* (non-Javadoc)
*
* @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
*/
@Override
public synchronized Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
// First, check if the class has already been loaded
Class<?> c = findLoadedClass(name);
if (c == null) {
try {
final int len = this.parentLoaders.length;
if (len == 0) {
c = findSystemClass(name);
} else {
for (int i = 0; i < len; i++) {
final ClassLoader parent = this.parentLoaders[i];
try {
c = parent.loadClass(name);
if (c != null) {
return c;
}
} catch (final ClassNotFoundException cnfe) {
// ignore
}
}
}
} catch (final ClassNotFoundException e) {
// If still not found, then invoke findClass in order
// to find the class.
c = findClass(name);
}
if (c == null) {
c = findClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
@Override
public URL getResource(final String name) {
for (final ClassLoader loader : parentLoaders) {
final URL url = loader.getResource(name);
if (url != null) {
return url;
}
}
return null;
}
}