| OrderByComparator.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 *
5 *
6 *
7 * The contents of this file are subject to the terms of the Liferay Enterprise
8 * Subscription License ("License"). You may not use this file except in
9 * compliance with the License. You can obtain a copy of the License by
10 * contacting Liferay, Inc. See the License for the specific language governing
11 * permissions and limitations under the License, including but not limited to
12 * distribution rights 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 public abstract class OrderByComparator implements Comparator, Serializable {
35
36 public abstract int compare(Object obj1, Object obj2);
37
38 public String getOrderBy() {
39 return null;
40 }
41
42 public String[] getOrderByFields() {
43 String orderBy = getOrderBy();
44
45 if (orderBy == null) {
46 return null;
47 }
48
49 String[] parts = StringUtil.split(orderBy);
50
51 String[] fields = new String[parts.length];
52
53 for (int i = 0; i < parts.length; i++) {
54 String part = parts[i];
55
56 int x = part.indexOf(StringPool.PERIOD);
57 int y = part.indexOf(StringPool.SPACE, x);
58
59 if (y == -1) {
60 y = part.length();
61 }
62
63 fields[i] = part.substring(x + 1, y);
64 }
65
66 return fields;
67 }
68
69 public boolean isAscending() {
70 String orderBy = getOrderBy();
71
72 if ((orderBy == null) || orderBy.toUpperCase().endsWith(" DESC")) {
73 return false;
74 }
75 else {
76 return true;
77 }
78 }
79
80 public String toString() {
81 return getOrderBy();
82 }
83
84 }