java.org.jboss.embedded.url.HandlerFactoryHack Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, 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.embedded.url;
import java.lang.reflect.Field;
import java.net.URL;
import java.net.URLStreamHandlerFactory;
import java.util.List;
/**
* Tries to set URL.setURLStreamHandlerFactory() with the provided factory.
* If it fails, it tries to reset handler by creating a BridgeHandlerFactory
* and hacking the JDK to overcome URL.setURLStreamHandlerFactory()'s limitation
* of only being able to be set up once.
*
* If there is already an existing handler factory then this factory will be added to the bridge list
*
* @author Bill Burke
* @version $Revision: 1.1 $
*/
public class HandlerFactoryHack
{
private List factories;
public List getFactories()
{
return factories;
}
public void setFactories(List factories)
{
this.factories = factories;
}
public void start() throws Exception
{
hack();
}
protected void hack() throws Exception
{
BridgeHandlerFactory bridge = new BridgeHandlerFactory(factories);
try
{
URL.setURLStreamHandlerFactory(bridge);
return;
}
catch (Error ignored)
{
// already set
}
try
{
Field factoryField = URL.class.getDeclaredField("factory");
factoryField.setAccessible(true);
URLStreamHandlerFactory old = (URLStreamHandlerFactory)factoryField.get(null);
if (old != null) factories.add(0, old);
factoryField.set(null, bridge);
}
catch (Exception e)
{
throw e;
}
}
}