001    /*
002     * CDDL HEADER START
003     *
004     * The contents of this file are subject to the terms of the
005     * Common Development and Distribution License, Version 1.0 only
006     * (the "License").  You may not use this file except in compliance
007     * with the License.
008     *
009     * You can obtain a copy of the license at
010     * trunk/opends/resource/legal-notices/OpenDS.LICENSE
011     * or https://OpenDS.dev.java.net/OpenDS.LICENSE.
012     * See the License for the specific language governing permissions
013     * and limitations under the License.
014     *
015     * When distributing Covered Code, include this CDDL HEADER in each
016     * file and include the License file at
017     * trunk/opends/resource/legal-notices/OpenDS.LICENSE.  If applicable,
018     * add the following below this CDDL HEADER, with the fields enclosed
019     * by brackets "[]" replaced with your own identifying information:
020     *      Portions Copyright [yyyy] [name of copyright owner]
021     *
022     * CDDL HEADER END
023     *
024     *
025     *      Copyright 2006-2008 Sun Microsystems, Inc.
026     */
027    package org.opends.server.replication.server;
028    
029    import java.util.Comparator;
030    
031    import org.opends.server.replication.common.ChangeNumber;
032    
033    /**
034     * This Class define a Comparator that allows to know which ReplicationIterator
035     * contain the next UpdateMessage in the order defined by the ChangeNumber
036     * of the UpdateMessage.
037     */
038    public class ReplicationIteratorComparator
039                  implements Comparator<ReplicationIterator>
040    {
041      /**
042       * Compare the ChangeNumber of the ReplicationIterator.
043       *
044       * @param o1 first ReplicationIterator.
045       * @param o2 second ReplicationIterator.
046       * @return result of the comparison.
047       */
048      public int compare(ReplicationIterator o1, ReplicationIterator o2)
049      {
050        ChangeNumber csn1 = o1.getChange().getChangeNumber();
051        ChangeNumber csn2 = o2.getChange().getChangeNumber();
052    
053        return ChangeNumber.compare(csn1, csn2);
054      }
055    }