/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* 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.infinispan.atomic;
import org.infinispan.atomic.AtomicHashMap;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
/**
* Represents no changes.
*
* @author Manik Surtani (<a href="mailto:manik AT jboss DOT org">manik AT jboss DOT org</a>)
* @since 4.0
*/
public class NullDelta implements Delta {
public static final NullDelta INSTANCE = new NullDelta();
public void writeExternal(ObjectOutput out) throws IOException {
// don't bother writing anything
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
// nothing to read
}
public DeltaAware merge(DeltaAware other) {
return (other != null && other instanceof AtomicHashMap) ? other : new AtomicHashMap();
}
}