/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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 software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.model.test;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Collections;
import java.util.Set;
import java.util.regex.Pattern;
import org.jboss.modules.filter.ClassFilter;
/**
* Internal use only.
*
* @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
*/
public class ChildFirstClassLoader extends URLClassLoader {
private final ClassLoader parent;
private final Set<Pattern> parentFirst;
private final Set<Pattern> childFirst;
private final ClassFilter parentExclusionFilter;
ChildFirstClassLoader(ClassLoader parent, Set<Pattern> parentFirst, Set<Pattern> childFirst, ClassFilter parentExclusionFilter, URL... urls) {
super(urls, parent);
assert parent != null : "Null parent";
assert parentFirst != null : "Null parent first";
assert childFirst != null : "Null child first";
this.parent = parent;
this.childFirst = Collections.unmodifiableSet(childFirst);
this.parentFirst = Collections.unmodifiableSet(parentFirst);
this.parentExclusionFilter = parentExclusionFilter;
// System.out.println("---------->");
// for (URL url : urls) {
// System.out.println(url);
// }
}
protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
if (loadFromParentOnly(name)) {
return parent.loadClass(name);
}
// First, check if the class has already been loaded
Class<?> c = findLoadedClass(name);
if (c == null) {
try {
c = findClass(name);
} catch (ClassNotFoundException e) {
if (parentExclusionFilter != null && parentExclusionFilter.accept(name)) {
throw e;
}
}
if (c == null) {
c = parent.loadClass(name);
}
if (c == null) {
findClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
@Override
public URL getResource(String name) {
URL url = findResource(name);
if (url != null) {
return url;
}
return super.getResource(name);
}
private boolean loadFromParentOnly(String className) {
boolean parent = false;
for (Pattern pattern : parentFirst) {
if (pattern.matcher(className).matches()) {
parent = true;
break;
}
}
if (parent) {
for (Pattern pattern : childFirst) {
if (pattern.matcher(className).matches()) {
return false;
}
}
}
return parent;
}
}