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 import org.opends.server.replication.protocol.UpdateMessage; 033 034 /** 035 * Class to use for establishing an order within UpdateMessages. 036 */ 037 public class UpdateComparator implements Comparator<UpdateMessage> 038 { 039 /** 040 * The UpdateComparator Singleton. 041 */ 042 public static UpdateComparator comparator = new UpdateComparator(); 043 044 /** 045 * Private constructor. 046 */ 047 private UpdateComparator() 048 { 049 super(); 050 } 051 052 /** 053 * Compares two UpdateMessages. 054 * 055 * @param msg1 first UpdateMessage to compare 056 * @param msg2 second UpdateMessage to compare 057 * @return -1 if msg1 < msg2 058 * 0 if msg1 == msg2 059 * 1 if msg1 > msg2 060 */ 061 public int compare(UpdateMessage msg1, UpdateMessage msg2) 062 { 063 return ChangeNumber.compare(msg1.getChangeNumber(), msg2.getChangeNumber()); 064 } 065 }