| PropertyComparator.java |
1 /**
2 * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 package com.liferay.util;
24
25 import java.lang.reflect.InvocationTargetException;
26
27 import java.util.Comparator;
28
29 import org.apache.commons.beanutils.PropertyUtils;
30 import org.apache.commons.logging.Log;
31 import org.apache.commons.logging.LogFactory;
32
33 /**
34 * <a href="PropertyComparator.java.html"><b><i>View Source</i></b></a>
35 *
36 * @author Patrick Brady
37 *
38 */
39 public class PropertyComparator implements Comparator {
40
41 public PropertyComparator(String propertyName) {
42 _propertyNames = new String[] {propertyName};
43 }
44
45 public PropertyComparator(String[] propertyNames) {
46 _propertyNames = propertyNames;
47 }
48
49 public int compare(Object obj1, Object obj2) {
50 try {
51 for (int i = 0; i < _propertyNames.length; i++) {
52 String propertyName = _propertyNames[i];
53
54 Object property1 =
55 PropertyUtils.getProperty(obj1, propertyName);
56 Object property2 =
57 PropertyUtils.getProperty(obj2, propertyName);
58
59 if (property1 instanceof String) {
60 int result = property1.toString().compareToIgnoreCase(
61 property2.toString());
62
63 if (result != 0) {
64 return result;
65 }
66 }
67
68 if (property1 instanceof Comparable) {
69 int result = ((Comparable)property1).compareTo(property2);
70
71 if (result != 0) {
72 return result;
73 }
74 }
75 }
76 }
77 catch (IllegalAccessException iae) {
78 _log.error(iae.getMessage());
79 }
80 catch (InvocationTargetException ite) {
81 _log.error(ite.getMessage());
82 }
83 catch (NoSuchMethodException nsme) {
84 _log.error(nsme.getMessage());
85 }
86
87 return -1;
88 }
89
90 private static Log _log = LogFactory.getLog(PropertyComparator.class);
91
92 private String[] _propertyNames;
93
94 }