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     */
016    package org.kuali.rice.kns.web.comparator;
017    
018    import java.io.Serializable;
019    import java.util.Comparator;
020    
021    public class NullCellComparator implements Comparator, Serializable {
022    
023        public int compare(Object o1, Object o2) {
024            if (o1 == null && o2 == null) {
025                return 0;
026            }
027            if (o1 == null) {
028                return -1;
029            }
030            else if (o2 == null) {
031                return 1;
032            }
033            else {
034                // probably won't go into this code segment, but doing it just in case
035                return CellComparatorHelper.getAppropriateComparatorForPropertyClass(o1.getClass()).compare(o1, o2);
036            }
037        }
038    
039    }