1 /**
2 * Copyright 2005-2016 The Kuali Foundation
3 *
4 * Licensed under the Educational Community License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.opensource.org/licenses/ecl2.php
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.kuali.rice.kns.web.comparator;
17
18 import java.io.Serializable;
19 import java.util.Comparator;
20
21 /**
22 * @deprecated KNS Struts deprecated, use KRAD and the Spring MVC framework.
23 */
24 @Deprecated
25 public class NullValueComparator implements Comparator, Serializable {
26 private static final NullValueComparator theInstance = new NullValueComparator();
27
28 public NullValueComparator() {
29 }
30
31 public static NullValueComparator getInstance() {
32 return theInstance;
33 }
34
35 public int compare(Object o1, Object o2) {
36 if (o1 == null && o2 == null) {
37 return 0;
38 }
39 if (o1 == null) {
40 return -1;
41 }
42 else if (o2 == null) {
43 return 1;
44 }
45 else {
46 // probably won't go into this code segment, but doing it just in case
47 return CellComparatorHelper.getAppropriateValueComparatorForPropertyClass(o1.getClass()).compare(o1, o2);
48 }
49 }
50 }