001/**
002 * Copyright 2005-2014 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 java.io.Serializable;
019import java.util.Comparator;
020
021/**
022 * @deprecated KNS Struts deprecated, use KRAD and the Spring MVC framework.
023 */
024@Deprecated
025public class NullValueComparator implements Comparator, Serializable {
026    private static final NullValueComparator theInstance = new NullValueComparator();
027    
028    public NullValueComparator() {
029    }
030
031    public static NullValueComparator getInstance() {
032        return theInstance;
033    }
034    
035    public int compare(Object o1, Object o2) {
036        if (o1 == null && o2 == null) {
037            return 0;
038        }
039        if (o1 == null) {
040            return -1;
041        }
042        else if (o2 == null) {
043            return 1;
044        }
045        else {
046            // probably won't go into this code segment, but doing it just in case
047            return CellComparatorHelper.getAppropriateValueComparatorForPropertyClass(o1.getClass()).compare(o1, o2);
048        }
049    }
050}