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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.junit.maven;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.HashSet;
import java.util.Set;
/**
* <p><table id="crc"><caption>CRC Card</caption>
* <tr><th> Responsibilities <th> Collaborations
* </table>
*
* @author Rupert Smith
*
* @noinspection CustomClassloader
*/
public class IsolatedClassLoader extends URLClassLoader
{
private static final URL[] EMPTY_URL_ARRAY = new URL[0];
private ClassLoader parent = ClassLoader.getSystemClassLoader();
private Set urls = new HashSet();
private boolean childDelegation = true;
public IsolatedClassLoader()
{
super(EMPTY_URL_ARRAY, null);
}
public IsolatedClassLoader(ClassLoader parent, boolean childDelegation)
{
super(EMPTY_URL_ARRAY, parent);
this.childDelegation = childDelegation;
}
public IsolatedClassLoader(ClassLoader parent)
{
super(EMPTY_URL_ARRAY, parent);
}
public void addURL(URL url)
{
// avoid duplicates
if (!urls.contains(url))
{
super.addURL(url);
urls.add(url);
}
}
public synchronized Class loadClass(String name) throws ClassNotFoundException
{
Class c;
if (childDelegation)
{
c = findLoadedClass(name);
ClassNotFoundException ex = null;
if (c == null)
{
try
{
c = findClass(name);
}
catch (ClassNotFoundException e)
{
ex = e;
if (parent != null)
{
c = parent.loadClass(name);
}
}
}
if (c == null)
{
throw ex;
}
}
else
{
c = super.loadClass(name);
}
return c;
}
}
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