001/**
002 * Copyright 2005-2016 The Kuali Foundation
003 *
004 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
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 */
016package org.kuali.rice.kns.web.comparator;
017
018import org.displaytag.model.Cell;
019import org.kuali.rice.krad.comparator.TemporalValueComparator;
020
021import java.io.Serializable;
022import java.util.Comparator;
023
024public class TemporalCellComparator implements Comparator, Serializable {
025
026    static final long serialVersionUID = 6587335959291216641L;
027
028    public TemporalCellComparator() {
029        super();
030    }
031
032    public int compare(Object o1, Object o2) {
033
034        // null guard. non-null value is greater. equal if both are null
035        if (null == o1 || null == o2) {
036            return null == o1 && null == o2 ? 0 : null == o1 ? -1 : 1;
037        }
038
039        String s1 = CellComparatorHelper.getSanitizedStaticValue((Cell) o1);
040        String s2 = CellComparatorHelper.getSanitizedStaticValue((Cell) o2);
041
042        return TemporalValueComparator.getInstance().compare(s1, s2);
043    }
044
045}