001/*
002 * (C) Copyright 2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id: StatementInfoComparator.java 20645 2007-06-17 13:16:54Z sfermigier $
020 */
021
022package org.nuxeo.ecm.platform.relations.web;
023
024import java.io.Serializable;
025import java.util.Comparator;
026import java.util.Date;
027
028/**
029 * Statement info comparator to sort relations.
030 *
031 * @author <a href="mailto:[email protected]">Anahide Tchertchian</a>
032 */
033public class StatementInfoComparator implements Comparator<StatementInfo>, Serializable {
034
035    private static final long serialVersionUID = -5117909579284277595L;
036
037    public int compare(StatementInfo stmt1, StatementInfo stmt2) {
038        // XXX AT: always compare by modification date for now, will have to be
039        // more pluggable when need to sort tables.
040        Date date1 = stmt1.getModificationDate();
041        Date date2 = stmt2.getModificationDate();
042        int result = 0;
043        if (date1 == null) {
044            result = date2 == null ? 0 : -1;
045        } else if (date2 == null) {
046            result = 1;
047        } else {
048            result = date1.compareTo(date2);
049        }
050        return result;
051    }
052
053}