/*
* 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.proxy;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.jboss.invocation.Invocation;
/**
* The base class for all interceptors.
*
* @author <a href="mailto:marc.fleury@jboss.org">Marc Fleury</a>
* @version $Revision: 81030 $
*/
public abstract class Interceptor
implements Externalizable
{
/** The serialVersionUID. @since 1.2 */
private static final long serialVersionUID = 4358098404672505200L;
/** The next interceptor in the chain. */
protected Interceptor nextInterceptor;
/**
* Set the next interceptor in the chain.
*
* <p>
* String together the interceptors
* We return the passed interceptor to allow for
* interceptor1.setNext(interceptor2).setNext(interceptor3)... constructs.
*/
public Interceptor setNext(final Interceptor interceptor) {
// assert interceptor != null
nextInterceptor = interceptor;
return interceptor;
}
public Interceptor getNext() {
return nextInterceptor;
}
public abstract Object invoke(Invocation mi) throws Throwable;
/**
* Writes the next interceptor.
*/
public void writeExternal(final ObjectOutput out)
throws IOException
{
out.writeObject(nextInterceptor);
}
/**
* Reads the next interceptor.
*/
public void readExternal(final ObjectInput in)
throws IOException, ClassNotFoundException
{
nextInterceptor = (Interceptor)in.readObject();
}
}