navigation.java

来自「tbuy1.1.5是在netbeans环境下用JSF技术编写的一个论坛tbuy1」· Java 代码 · 共 218 行

/*
 * 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！
 * 
 * BBS的导航条
 */

package biz.tbuy.bbs.bean;

import biz.tbuy.bbs.ForumModel;
import biz.tbuy.bbs.TopicAction;
import biz.tbuy.bbs.TopicModel;
import biz.tbuy.bbs.ZoneModel;
import java.util.List;
import javax.faces.component.UIComponent;
import javax.faces.component.UIPanel;
import javax.faces.component.UIOutput;
import javax.faces.component.html.HtmlOutputLink;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
/**
 * @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 Navigation extends BaseBean{
    /**
     * 页面URL中的ID标识，如 /topic/11.faces 中的 11
     * /bbs/zone/x.faces
     * /bbs/forum/x.faces
     * /bbs/topic/x.faces
     */ 
    private int id;
    private boolean inZone;     // 表示当前所在的页面是否为 /bbs/zone/...
    private boolean inForum;    // 表示当前所在的页面是否为 /bbs/forum/..
    private boolean inTopic;    // 表示当前所在的页面是否为 /bbs/topic/...
    private boolean inReply;    // 表示当前所在的页面是否为 /bbs/reply/...
    private UIPanel uiPanel;    // 页面导航条 绑定于页面 navigation.jsp 中
    
    public Navigation() {
        String view;
        try {
            FacesContext fc = getFacesContext(); 
            view = fc.getViewRoot().getViewId();
        } catch (Exception e) {
            HttpServletRequest request = (HttpServletRequest) 
                getFacesContext().getExternalContext().getRequest();
            view = request.getRequestURL().toString();
            //out("Exception:" + e.getMessage());
        }
        //out("viewNav=" + view);
        parseURI(view);
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    public int getId() {
        return id;
    }
    
    public void setInZone(boolean inZone) {
        this.inZone = inZone;
    }
    
    public boolean getInZone() {
        return inZone;
    }
    
    public void setInForum(boolean inForum) {
        this.inForum = inForum;
    }
    
    public boolean getInForum() {
        return inForum;
    }
    
    public void setInTopic(boolean inTopic) {
        this.inTopic = inTopic;
    }
    
    public boolean getInTopic() {
        return inTopic;
    }
    
    // 页面的导航组件
    public void setUiPanel(UIPanel uiPanel) {
        this.uiPanel = uiPanel;
    }
    
    /* 设置页面导航组件 */
    public UIPanel getUiPanel() {
        uiPanel = new UIPanel();
        try {
            List<UIComponent> comList = uiPanel.getChildren();
            comList.add(getZonesLink(true));
            if (inZone) {
                ZoneModel zone = getBBSApplication().getZonesMap().get(id);
                comList.add(getOutput());
                comList.add(getZoneLink(zone, false));
            } else if (inForum) {
                ForumModel forum = getBBSApplication().getForumsMap().get(id);
                ZoneModel zone = getBBSApplication().getZonesMap().get(forum.getByZone());
                comList.add(getOutput());
                comList.add(getZoneLink(zone, true));
                comList.add(getOutput());
                comList.add(getForumLink(forum, false));
            } else if (inTopic) {
                TopicModel topic = TopicAction.getTopicsById(id);
                ForumModel forum = getBBSApplication().getForumsMap().get(topic.getByForum());
                ZoneModel zone = getBBSApplication().getZonesMap().get(forum.getByZone());

                comList.add(getOutput());
                comList.add(getZoneLink(zone, true));
                comList.add(getOutput());
                comList.add(getForumLink(forum, true));
                comList.add(getOutput());
                comList.add(getTopicLink(topic, true));
            }
        } catch (Exception e) {
            System.out.println("Exception in Navigation/" + e.getMessage());
        }
        return uiPanel;
    }
    
    /**
     * get UIComponents
     */ 
    private UIComponent getZonesLink(boolean showLink) {
        UIOutput link = (HtmlOutputLink)
                getApplication().createComponent(HtmlOutputLink.COMPONENT_TYPE);
        UIOutput text = (HtmlOutputText)
                getApplication().createComponent(HtmlOutputText.COMPONENT_TYPE);
        link.setValue( getContextPath() + "/bbs/forums.faces");
        // 取得个性化网站名称
        text.setValue(getComApplication().getMySetting().get("webname"));
        link.getChildren().add(text);
        if (showLink) {
            return link;
        } else {
            return text;
        }
    }
    
    /**
     * get UIComponents
     */ 
    private UIComponent getZoneLink(ZoneModel zone, boolean showLink) {
        UIOutput link = (HtmlOutputLink)
                getApplication().createComponent(HtmlOutputLink.COMPONENT_TYPE);
        UIOutput text = (HtmlOutputText)
                getApplication().createComponent(HtmlOutputText.COMPONENT_TYPE);
        link.setValue(getContextPath() + "/bbs/zone/" + zone.getNum() + ".faces");
        text.setValue(zone.getName());
        link.getChildren().add(text);
        return showLink ? link : text;
    }
    
    private UIComponent getForumLink(ForumModel forum, boolean showLink) {
        UIOutput link = (HtmlOutputLink)
                getApplication().createComponent(HtmlOutputLink.COMPONENT_TYPE);
        UIOutput text = (HtmlOutputText)
                getApplication().createComponent(HtmlOutputText.COMPONENT_TYPE);
        link.setValue(getContextPath() + "/bbs/forum/" + forum.getNum() + ".faces");
        text.setValue(forum.getName());
        link.getChildren().add(text);
        return showLink ? link : text;
    }
    
    private UIComponent getTopicLink(TopicModel topic, boolean showLink) {
        UIOutput link = (HtmlOutputLink)
                getApplication().createComponent(HtmlOutputLink.COMPONENT_TYPE);
        UIOutput text = (HtmlOutputText)
                getApplication().createComponent(HtmlOutputText.COMPONENT_TYPE);
        link.setValue(getContextPath() + "/bbs/topic/" + topic.getNum() + ".faces");
        text.setValue(topic.getTitle());
        link.getChildren().add(text);
        return showLink ? link : text;
    }
    
    private UIComponent getOutput() {
        UIOutput nextText = (HtmlOutputText)
                getApplication().createComponent(HtmlOutputText.COMPONENT_TYPE);
        nextText.setValue(" >> ");
        return nextText;
    }
    
    /**
     * 分析当前请求的URL是否于哪一个页面中
     */ 
    private void parseURI(String uri) {
        // 尝试分析URI中的字串以用于navigation,zone,forum,topic
        try {
            // System.out.println("uri=" + uri);
            if (uri.indexOf("/bbs/zone/") != -1) {
                this.inZone = true;
            } else if (uri.indexOf("/bbs/forum/") != -1) {
                this.inForum = true;
            } else if (uri.indexOf("/bbs/topic/") != -1) {
                this.inTopic = true;
            } else if (uri.indexOf("/bbs/reply/") != -1) {
                this.inReply = true;
            }
            int start = uri.lastIndexOf("/");
            int end = uri.lastIndexOf(".");
            id = Integer.parseInt(uri.substring(start + 1, end));
        } catch (NumberFormatException nfe) {
            //System.out.println("NumberFormatException:in Navigation" 
            //+ nfe.getMessage());
        }
    }
}