forum.java

tbuy1.1.5是在netbeans环境下用JSF技术编写的一个论坛tbuy1.1.5是在netbeans环境下用JSF技术编写的一个论坛

/*
 * 作者: 胡李青
 * qq: 31703299
 * Copyright (c) 2007 huliqing
 * 主页 http://www.tbuy.biz/
 * 你可以免费使用该软件，未经许可请勿作用于任何商业目的,如有技术问题请与本人联系！
 */

package biz.tbuy.bbs.bean;

import biz.tbuy.bbs.ForumBuilder;
import biz.tbuy.bbs.ForumFactory;
import biz.tbuy.common.page.DataPage;
import biz.tbuy.common.page.PagedListDataModel;
import java.util.List;
import java.util.Map;
import javax.faces.component.UIData;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.model.DataModel;
/**
 * @author huliqing
 * <p><b>qq：</b>31703299
 * <p><b>E-mail：</b><a href="mailto:[e-mail]">[e-mail]</a>
 * <p><b>Homepage：</b><a href="http://www.tbuy.biz/">http://www.tbuy.biz/</a>
 */
public class Forum extends BaseBean{
    private int _forumId;    // 相应的讨论区id
    private List<String> _masters;  // 该讨论区的版主列表
    private DataModel _topicsObj;   // 相关的主题
    private UIData _uiTopicsObj;
    private int _pageSize = 12;     // 默认的分页显示数目
    
    /** Creates a new instance of TopicsBean */
    public Forum() {
        FacesContext fc = getFacesContext();
        String requestPath = fc.getViewRoot().getViewId();
        int start = requestPath.lastIndexOf("/");
        int end = requestPath.lastIndexOf(".");
        try {
            _forumId = Integer.parseInt(requestPath.substring(start + 1, end));
            _masters = getBBSApplication().getMasters().get(_forumId);
        } catch (Exception e) {}
    }
    
    public void setForumId(int forumId) {
        _forumId = forumId;
    }

    public int getForumId() {
        return _forumId;
    }
    
    public List<String> getMasters() {
        return _masters;
    }
    
    public void setTopicsObj(DataModel topicsObj) {
        _topicsObj = topicsObj;
    }
    
    public DataModel getTopicsObj() {
        if (_topicsObj == null) {
            _topicsObj = new LocalDataModel(_pageSize);
        }
        return _topicsObj;
    }
    
    public void setUiTopicsObj(UIData uiTopicsObj) {
        _uiTopicsObj = uiTopicsObj;
    }
    
    public UIData getUiTopicsObj() {
        return _uiTopicsObj;
    }
    
    public void setPageSize(int pageSize) {
        _pageSize = pageSize;
    }
    
    public int getPageSize() {
        return _pageSize;
    }
    
    // ------------------------------------------------------------ page about
    private  DataPage getDataPage(int startRow, int pageSize) {
        ForumBuilder fBuilder = ForumFactory.newBuilder(_forumId);
        int total = fBuilder.getTotalTopics();
        List<Map> dataList = fBuilder.getTopicsObjectForPage(startRow, pageSize);
        return new DataPage(total, startRow, dataList);
    }
    
    private class LocalDataModel extends PagedListDataModel {
        public  LocalDataModel(int pageSize) {
             super (pageSize);
        }
        
        public DataPage fetchPage(int startRow,int pageSize) {
             // call enclosing managed bean method to fetch the data 
             return getDataPage(startRow, pageSize);
        }
    }
    
    // -----------------------------------------------------------页面跳转
    private int _jumpTo;
    
    public void setJumpTo(int jumpTo) {
        _jumpTo = jumpTo;
    }
    
    public int getJumpTo() {
        return _jumpTo;
    }
    
    /**
     * 关于页面的跳转
     */
    public void jump(ActionEvent e) {
        double totalPage = Math.ceil((double)_uiTopicsObj.getRowCount() / _pageSize);
        if (_jumpTo > 0 && _jumpTo <= totalPage) {
            int first = (_jumpTo - 1) * _pageSize;
            _uiTopicsObj.setFirst(first);
        }
    }
}