| OrderByComparator.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 * The contents of this file are subject to the terms of the Liferay Enterprise
5 * Subscription License ("License"). You may not use this file except in
6 * compliance with the License. You can obtain a copy of the License by
7 * contacting Liferay, Inc. See the License for the specific language governing
8 * permissions and limitations under the License, including but not limited to
9 * distribution rights of the Software.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 */
19
20 package com.liferay.portal.kernel.util;
21
22 import java.io.Serializable;
23
24 import java.util.Comparator;
25
26 /**
27 * <a href="OrderByComparator.java.html"><b><i>View Source</i></b></a>
28 *
29 * @author Brian Wing Shun Chan
30 *
31 */
32 public abstract class OrderByComparator implements Comparator, Serializable {
33
34 public abstract int compare(Object obj1, Object obj2);
35
36 public String getOrderBy() {
37 return null;
38 }
39
40 public String[] getOrderByFields() {
41 String orderBy = getOrderBy();
42
43 if (orderBy == null) {
44 return null;
45 }
46
47 String[] parts = StringUtil.split(orderBy);
48
49 String[] fields = new String[parts.length];
50
51 for (int i = 0; i < parts.length; i++) {
52 String part = parts[i];
53
54 int x = part.indexOf(StringPool.PERIOD);
55 int y = part.indexOf(StringPool.SPACE, x);
56
57 if (y == -1) {
58 y = part.length();
59 }
60
61 fields[i] = part.substring(x + 1, y);
62 }
63
64 return fields;
65 }
66
67 public boolean isAscending() {
68 String orderBy = getOrderBy();
69
70 if ((orderBy == null) || orderBy.toUpperCase().endsWith(" DESC")) {
71 return false;
72 }
73 else {
74 return true;
75 }
76 }
77
78 public String toString() {
79 return getOrderBy();
80 }
81
82 }