001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.portal.kernel.cache.cluster;
016    
017    import java.util.Comparator;
018    
019    /**
020     * @author Shuyang Zhou
021     */
022    public class PortalCacheClusterEventCoalesceComparator
023            implements Comparator<PortalCacheClusterEvent> {
024    
025            public int compare(
026                    PortalCacheClusterEvent portalCacheClusterEvent1,
027                    PortalCacheClusterEvent portalCacheClusterEvent2) {
028    
029                    if ((portalCacheClusterEvent1 == null) ||
030                            (portalCacheClusterEvent2 == null)) {
031    
032                            return 1;
033                    }
034    
035                    if (portalCacheClusterEvent1.getCacheName().equals(
036                                    portalCacheClusterEvent2.getCacheName()) &&
037                            portalCacheClusterEvent1.getElementKey().equals(
038                                    portalCacheClusterEvent2.getElementKey())) {
039    
040                            return 0;
041                    }
042                    else {
043                            return -1;
044                    }
045            }
046    
047    }