001    /**
002     * Copyright (c) 2000-present 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
024            extends OrderByComparator<JournalArticle> {
025    
026            public static final String ORDER_BY_ASC = "JournalArticle.version ASC";
027    
028            public static final String ORDER_BY_DESC = "JournalArticle.version DESC";
029    
030            public static final String[] ORDER_BY_FIELDS = {"version"};
031    
032            public ArticleVersionComparator() {
033                    this(false);
034            }
035    
036            public ArticleVersionComparator(boolean ascending) {
037                    _ascending = ascending;
038            }
039    
040            @Override
041            public int compare(JournalArticle article1, JournalArticle article2) {
042                    int value = 0;
043    
044                    if (article1.getVersion() < article2.getVersion()) {
045                            value = -1;
046                    }
047                    else if (article1.getVersion() > article2.getVersion()) {
048                            value = 1;
049                    }
050    
051                    if (_ascending) {
052                            return value;
053                    }
054                    else {
055                            return -value;
056                    }
057            }
058    
059            @Override
060            public String getOrderBy() {
061                    if (_ascending) {
062                            return ORDER_BY_ASC;
063                    }
064                    else {
065                            return ORDER_BY_DESC;
066                    }
067            }
068    
069            @Override
070            public String[] getOrderByFields() {
071                    return ORDER_BY_FIELDS;
072            }
073    
074            @Override
075            public boolean isAscending() {
076                    return _ascending;
077            }
078    
079            private final boolean _ascending;
080    
081    }