1 /***
2 * @(#)PageManager.java
3 *
4 * JFoxSOAF, Service-Oriented Application Framework
5 *
6 * Copyright(c) JFoxSOAF Team
7 *
8 * Licensed under the GNU LGPL, Version 2.1 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 * http://www.gnu.org/copyleft/lesser.html
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 *
20 * For more information, please visit:
21 * http://www.jfox.cn/confluence/display/JFoxSOAF/Home
22 * http://www.huihoo.org/jfox/jfoxsoaf
23 */
24
25 package org.huihoo.jfox.soaf.util.pager;
26
27 /***
28 * <p>
29 * Pager Manager.
30 * </p>
31 *
32 * @author <a href="mailto:founder_chen@yahoo.com.cn">Peter Cheng </a>
33 * @version $Revision: 1.1 $ $Date: 2005/05/22 06:51:48 $
34 * @version Revision: 1.0
35 */
36
37 public class PageManager {
38
39 private PageModel pageModel = new PageModel();
40
41 /***
42 * Calculate current page info.
43 *
44 * @param pageSize the total size.
45 * @param pageNum the numuber of current page
46 * @param resultNum the result number of page
47 * @return PageInfo
48 */
49 public PageModel calculate(int pageSize, int pageNum, int resultNum) {
50
51 int totalPage = (resultNum + pageSize - 1) / pageSize;
52 int intValue = 0;
53 int pageNumber = 1;
54 intValue = totalPage;
55 pageNumber = pageNum;
56
57 if (intValue > 0) {
58 pageModel.setTotalPage(totalPage);
59 }
60 intValue = resultNum;
61 if (intValue > 0) {
62 pageModel.setResultCount(resultNum);
63 }
64
65 if (pageNumber >= totalPage) {
66 pageNumber = totalPage;
67 } else if (pageNumber <= 0) {
68 pageNumber = 1;
69 }
70 pageModel.setPage(pageNumber);
71 return pageModel;
72 }
73
74 /***
75 * Return start page index.
76 *
77 * @param pageNum
78 * @param pageSize
79 * @return page start index
80 */
81 public int pageStartIndex(int pageNum, int pageSize) {
82 return (pageNum - 1) * pageSize;
83 }
84
85 }