001    /**
002     * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.notifications;
016    
017    import java.util.Comparator;
018    
019    /**
020     * @author Edward Han
021     */
022    public class NotificationEventComparator
023            implements Comparator<NotificationEvent> {
024    
025            public NotificationEventComparator() {
026                    this(true);
027            }
028    
029            public NotificationEventComparator(boolean ascending) {
030                    _ascending = ascending;
031            }
032    
033            public int compare(
034                    NotificationEvent notificationEvent1,
035                    NotificationEvent notificationEvent2) {
036    
037                    long deliverBy1 = notificationEvent1.getDeliverBy();
038                    long deliverBy2 = notificationEvent2.getDeliverBy();
039    
040                    int value = 0;
041    
042                    if (deliverBy1 < deliverBy2) {
043                            value = -1;
044                    }
045                    else if (deliverBy1 > deliverBy2) {
046                            value = 1;
047                    }
048    
049                    if (_ascending) {
050                            return value;
051                    }
052                    else {
053                            return -value;
054                    }
055            }
056    
057            private boolean _ascending;
058    
059    }