/*
* JBoss, Home of Professional Open Source
* Copyright 2006, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt 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.deployers.plugins.annotations;
import java.lang.ref.WeakReference;
import org.jboss.util.JBossObject;
/**
* ClassLoader holder helper.
*
* @author <a href="mailto:ales.justin@jboss.com">Ales Justin</a>
*/
abstract class WeakClassLoaderHolder extends JBossObject
{
private transient WeakReference<ClassLoader> clRef;
public WeakClassLoaderHolder(ClassLoader classLoader)
{
if (classLoader == null)
throw new IllegalArgumentException("Null classloader");
clRef = new WeakReference<ClassLoader>(classLoader);
}
/**
* Get the classloader from weak ref.
*
* @return the classloader
*/
protected ClassLoader getClassLoader()
{
if (clRef == null)
throw new IllegalArgumentException("Null classloader ref, previously serialized?");
ClassLoader classLoader = clRef.get();
if (classLoader == null)
throw new IllegalArgumentException("ClassLoader was already garbage collected.");
return classLoader;
}
/**
* Load class from class name.
*
* @param className the class name
* @return loaded class
*/
protected Class<?> loadClass(String className)
{
try
{
return Class.forName(className, false, getClassLoader());
}
catch (ClassNotFoundException e)
{
throw new RuntimeException(e);
}
}
}