1 /*
2 * Copyright 2006-2008 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 import org.displaytag.model.Cell;
22
23 public class StringCellComparator implements Comparator, Serializable {
24
25 static final long serialVersionUID = -183249045552328424L;
26
27 /*
28 * (non-Javadoc)
29 *
30 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
31 */
32 public int compare(Object o1, Object o2) {
33 // null guard. non-null value is greater. equal if both are null
34 if (null == o1 || null == o2) {
35 return (null == o1 && null == o2) ? 0 : ((null == o1) ? -1 : 1);
36 }
37
38 String s1 = CellComparatorHelper.getSanitizedStaticValue((Cell) o1);
39 String s2 = CellComparatorHelper.getSanitizedStaticValue((Cell) o2);
40
41 return StringValueComparator.getInstance().compare(s1, s2);
42 }
43 }