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/*
* Sonar CLI
* Copyright (C) 2009 SonarSource
* dev@sonar.codehaus.org
*
* This program 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 3 of the License, or (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
*/
package org.sonar.cli;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class ChildFirstClassLoader extends URLClassLoader {
public ChildFirstClassLoader() {
super(new URL[0]);
}
@Override
public void addURL(URL url) {
super.addURL(url);
}
public void addFile(File file) {
try {
addURL(file.toURI().toURL());
} catch (MalformedURLException e) {
throw new RuntimeException(e);
}
}
/**
* Searches for classes using child-first strategy.
*/
@Override
protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
// First, check if the class has already been loaded
Class<?> c = findLoadedClass(name);
// If not loaded, search the local (child) resources
if (c == null) {
try {
c = findClass(name);
} catch (ClassNotFoundException e) {
// ignore
}
}
// If we could not find it, delegate to parent
// Note that we don't attempt to catch any ClassNotFoundException
if (c == null) {
if (getParent() != null) {
c = getParent().loadClass(name);
} else {
c = getSystemClassLoader().loadClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
}
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