| OrderByComparator.java |
1 /**
2 * Copyright (c) 2000-2009 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.portal.kernel.util;
24
25 import java.io.Serializable;
26
27 import java.util.Comparator;
28
29 /**
30 * <a href="OrderByComparator.java.html"><b><i>View Source</i></b></a>
31 *
32 * @author Brian Wing Shun Chan
33 *
34 */
35 public abstract class OrderByComparator implements Comparator, Serializable {
36
37 public abstract int compare(Object obj1, Object obj2);
38
39 public String getOrderBy() {
40 return null;
41 }
42
43 public String[] getOrderByFields() {
44 String orderBy = getOrderBy();
45
46 if (orderBy == null) {
47 return null;
48 }
49
50 String[] parts = StringUtil.split(orderBy);
51
52 String[] fields = new String[parts.length];
53
54 for (int i = 0; i < parts.length; i++) {
55 String part = parts[i];
56
57 int x = part.indexOf(StringPool.PERIOD);
58 int y = part.indexOf(StringPool.SPACE, x);
59
60 if (y == -1) {
61 y = part.length();
62 }
63
64 fields[i] = part.substring(x + 1, y);
65 }
66
67 return fields;
68 }
69
70 public boolean isAscending() {
71 String orderBy = getOrderBy();
72
73 if ((orderBy == null) || orderBy.toUpperCase().endsWith(" DESC")) {
74 return false;
75 }
76 else {
77 return true;
78 }
79 }
80
81 public String toString() {
82 return getOrderBy();
83 }
84
85 }