001/*
002 * (C) Copyright 2007 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 *
017 * $Id: StatementInfoComparator.java 20645 2007-06-17 13:16:54Z sfermigier $
018 */
019
020package org.nuxeo.ecm.platform.relations.web;
021
022import java.io.Serializable;
023import java.util.Comparator;
024import java.util.Date;
025
026/**
027 * Statement info comparator to sort relations.
028 *
029 * @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a>
030 */
031public class StatementInfoComparator implements Comparator<StatementInfo>, Serializable {
032
033    private static final long serialVersionUID = -5117909579284277595L;
034
035    public int compare(StatementInfo stmt1, StatementInfo stmt2) {
036        // XXX AT: always compare by modification date for now, will have to be
037        // more pluggable when need to sort tables.
038        Date date1 = stmt1.getModificationDate();
039        Date date2 = stmt2.getModificationDate();
040        int result = 0;
041        if (date1 == null) {
042            result = date2 == null ? 0 : -1;
043        } else if (date2 == null) {
044            result = 1;
045        } else {
046            result = date1.compareTo(date2);
047        }
048        return result;
049    }
050
051}