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    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  }