/*
* JBoss, Home of Professional Open Source.
* Copyright 2010, 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.weld.integration.deployer.env.bda;
import org.jboss.classloading.spi.RealClassLoader;
import org.jboss.classloading.spi.dependency.Module;
import org.jboss.deployers.plugins.classloading.AbstractDeploymentClassLoaderPolicyModule;
import org.jboss.deployers.structure.spi.DeploymentUnit;
/**
* Use deployment unit to get top level classloader.
*
* @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
*/
public class DUTopLevelClassLoaderGetter implements TopLevelClassLoaderGetter
{
/** The singleton instance */
public static final TopLevelClassLoaderGetter INSTANCE = new DUTopLevelClassLoaderGetter();
/**
* Get instance.
*
* @return the instance
*/
public static TopLevelClassLoaderGetter getInstance()
{
return INSTANCE;
}
public ClassLoader getTopLevelClassLoader(ClassLoader cl)
{
if (cl == null)
throw new IllegalArgumentException("Null classloader");
// start at the first BaseClassLoader parent,
ClassLoader firstBaseClassLoader = cl;
while (firstBaseClassLoader != null && !(firstBaseClassLoader instanceof RealClassLoader))
{
firstBaseClassLoader = firstBaseClassLoader.getParent();
}
if (firstBaseClassLoader == null)
{
// no BaseClassLoader found, perhaps this is top-level
return cl;
}
Module module = SecurityActions.getModuleForClassLoader(firstBaseClassLoader);
if (module == null || (module instanceof AbstractDeploymentClassLoaderPolicyModule == false))
{
return cl;
}
AbstractDeploymentClassLoaderPolicyModule abclm = (AbstractDeploymentClassLoaderPolicyModule) module;
DeploymentUnit du = abclm.getDeploymentUnit();
return du.getTopLevel().getClassLoader();
}
}