CrudEventFilter.java

package org.neo4j.util;

import java.util.HashSet;
import java.util.Set;
import org.neo4j.kernel.impl.event.Event;
import org.neo4j.kernel.impl.event.EventData;
import org.neo4j.util.CrudEventData.AlterationMode;

/**
 * Useful filter implementation which functions like a filter for CRUD
 * operations. Uses {@link CrudEventData}.
 * @author mattias
 */
public class CrudEventFilter implements EventFilter
{
	private Set<Long> modified = new HashSet<Long>();
	
	public boolean pass( Event event, EventData data )
	{
		CrudEventData d = ( CrudEventData ) data.getData();
		boolean result = this.modified.add( d.getNodeId() );
		return result || d.getAlterationMode() == AlterationMode.DELETED;
	}
}