001    /**
002     * Copyright (c) 2000-2010 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.portlet.journal.util.comparator;
016    
017    import com.liferay.portal.kernel.util.OrderByComparator;
018    import com.liferay.portlet.journal.model.JournalArticle;
019    
020    /**
021     * @author Brian Wing Shun Chan
022     */
023    public class ArticleVersionComparator extends OrderByComparator {
024    
025            public static String ORDER_BY_ASC = "version ASC";
026    
027            public static String ORDER_BY_DESC = "version DESC";
028    
029            public static String[] ORDER_BY_FIELDS = {"version"};
030    
031            public ArticleVersionComparator() {
032                    this(false);
033            }
034    
035            public ArticleVersionComparator(boolean ascending) {
036                    _ascending = ascending;
037            }
038    
039            public int compare(Object obj1, Object obj2) {
040                    JournalArticle article1 = (JournalArticle)obj1;
041                    JournalArticle article2 = (JournalArticle)obj2;
042    
043                    int value = 0;
044    
045                    if (article1.getVersion() < article2.getVersion()) {
046                            value = -1;
047                    }
048                    else if (article1.getVersion() > article2.getVersion()) {
049                            value = 1;
050                    }
051    
052                    if (_ascending) {
053                            return value;
054                    }
055                    else {
056                            return -value;
057                    }
058            }
059    
060            public String getOrderBy() {
061                    if (_ascending) {
062                            return ORDER_BY_ASC;
063                    }
064                    else {
065                            return ORDER_BY_DESC;
066                    }
067            }
068    
069            public String[] getOrderByFields() {
070                    return ORDER_BY_FIELDS;
071            }
072    
073            public boolean isAscending() {
074                    return _ascending;
075            }
076    
077            private boolean _ascending;
078    
079    }