001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.gwt.client.ui.input.category;
029
030import org.opencms.gwt.client.ui.CmsListItem;
031
032import java.util.Comparator;
033
034/**
035 * Comparator for list items with a data value widget as there main widget.<p>
036 */
037public class CmsListItemDataComparator implements Comparator<CmsListItem> {
038
039    /** The parameter index to compare. */
040    private int m_paramIndex;
041
042    /** Flag to indicate sorting ascending or descending. */
043    private boolean m_ascending;
044
045    /**
046     * Default Constructor.<p>
047     *
048     * @param paramIndex the parameter index to compare
049     * @param ascending the sort order
050     */
051    public CmsListItemDataComparator(int paramIndex, boolean ascending) {
052
053        m_paramIndex = paramIndex;
054        m_ascending = ascending;
055    }
056
057    /**
058     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
059     */
060    public int compare(CmsListItem o1, CmsListItem o2) {
061
062        int result = 0;
063        String val1 = null;
064        String val2 = null;
065        try {
066            CmsDataValue d1 = (CmsDataValue)o1.getMainWidget();
067            CmsDataValue d2 = (CmsDataValue)o2.getMainWidget();
068            if (m_paramIndex == 0) {
069                val1 = d1.getLabel();
070                val2 = d2.getLabel();
071            } else {
072                val1 = d1.getParameter(m_paramIndex);
073                val2 = d2.getParameter(m_paramIndex);
074            }
075        } catch (@SuppressWarnings("unused") Exception e) {
076            // ignore class cast exceptions
077        }
078
079        if (val1 != null) {
080            result = val1.compareTo(val2);
081        } else if (val2 != null) {
082            result = 1;
083        }
084        return m_ascending ? result : -result;
085    }
086
087}