001    /**
002     * Copyright (c) 2000-2013 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.wiki.util.comparator;
016    
017    import com.liferay.portal.kernel.util.OrderByComparator;
018    import com.liferay.portlet.wiki.model.WikiPage;
019    
020    /**
021     * @author Bruno Farache
022     */
023    public class PageVersionComparator extends OrderByComparator {
024    
025            public static final String ORDER_BY_ASC = "WikiPage.version ASC";
026    
027            public static final String ORDER_BY_DESC = "WikiPage.version DESC";
028    
029            public static final String[] ORDER_BY_FIELDS = {"version"};
030    
031            public PageVersionComparator() {
032                    this(false);
033            }
034    
035            public PageVersionComparator(boolean ascending) {
036                    _ascending = ascending;
037            }
038    
039            @Override
040            public int compare(Object obj1, Object obj2) {
041                    WikiPage page1 = (WikiPage)obj1;
042                    WikiPage page2 = (WikiPage)obj2;
043    
044                    int value = 0;
045    
046                    if (page1.getVersion() < page2.getVersion()) {
047                            value = -1;
048                    }
049                    else if (page1.getVersion() > page2.getVersion()) {
050                            value = 1;
051                    }
052    
053                    if (_ascending) {
054                            return value;
055                    }
056                    else {
057                            return -value;
058                    }
059            }
060    
061            @Override
062            public String getOrderBy() {
063                    if (_ascending) {
064                            return ORDER_BY_ASC;
065                    }
066                    else {
067                            return ORDER_BY_DESC;
068                    }
069            }
070    
071            @Override
072            public String[] getOrderByFields() {
073                    return ORDER_BY_FIELDS;
074            }
075    
076            @Override
077            public boolean isAscending() {
078                    return _ascending;
079            }
080    
081            private boolean _ascending;
082    
083    }