booklist.java

学习tapestry的好书啊,绝对经典实用.

package com.cucu.tapestry.page;

import com.cucu.tapestry.component.MyBasePage;
import com.cucu.tapestry.core.MyEngine;
import com.cucu.tapestry.core.MyVisit;
import com.cucu.tapestry.entity.Guestbook;
import com.cucu.tapestry.service.GuestbookService;
import org.apache.tapestry.IExternalPage;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.RedirectException;
import org.apache.tapestry.event.PageBeginRenderListener;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.valid.ValidationDelegate;

import javax.servlet.http.HttpServletRequest;
import java.sql.Timestamp;
import java.util.Date;
import java.util.List;

/**
 * 留言列表
 * @author 绝情酷哥
 * @version 1.0
 */
public abstract class BookList
        extends MyBasePage
        implements PageBeginRenderListener, IExternalPage {


    public abstract void setErrorMessage(String msg);

    public abstract String getTitle();

    public abstract void setTitle(String title);

    public abstract String getContent();

    public abstract void setContent(String content);

    public abstract GuestbookService getGuestbookService();

    public abstract MyVisit getMyVisit();

    public abstract HttpServletRequest getServletRequest();


    /**
     * @param parentId
     * @return 回复总数
     */
    public Integer getCommentCount(Integer parentId) {
        Integer r = this.getGuestbookService().getCommentCount(parentId);
        if (r == null)
            return new Integer(0);
        else
            return r;
    }

    /**
     * @return 计算总共花费时间
     */
    public Integer getSumTime() {
        return this.getGuestbookService().getSumTime();
    }

    /**
     * @return 留言列表
     */
    public List getBookList() {
        if (this.getPageUtil().getTotalCount() <= 0) {
            this.getPageUtil().setTotalCount((getGuestbookService().getCount()));
        }

        int pos = (this.getPageUtil().getCurrentPageNum() - 1) * this.getPageUtil().getPerPageNum();
        int size = this.getPageUtil().getPerPageNum();
        return this.getGuestbookService().getList(pos, size);
    }

    /**
     * 响应删除贴子事件
     *
     * @param cycle
     */
    public void doDelete(IRequestCycle cycle) {
        Object[] parameters = cycle.getListenerParameters();
        Integer id = (Integer) parameters[0];
        String username = (String) parameters[1];
        MyVisit visit = this.getMyVisit();
        if (!username.equalsIgnoreCase(visit.getUsername())) {
            this.setErrorMessage("您不是本贴创建者，您不能删除此贴！");
            return;
        }
        this.getGuestbookService().doDeleteTopic(id);
        this.getPageUtil().setTotalCount((getGuestbookService().getCount()));

        throw new RedirectException(((MyEngine) this.getEngine()).getPageLinkUrl(this.getPageName()));
    }

    /**
     * 设置置顶操作
     *
     * @param cycle
     */
    public void doSetTop(IRequestCycle cycle) {
        Object[] parameters = cycle.getListenerParameters();
        Integer id = (Integer) parameters[0];
        this.getGuestbookService().doSetTop(id);
        //cycle.activate("BookList"); //跳转页面
    }

    /**
     * 新增留言事件
     *
     * @param cycle
     */
    public String doNewTopic(IRequestCycle cycle) {
        ValidationDelegate delegate = (ValidationDelegate) this.getBeans().getBean("delegate");
        if (delegate.getHasErrors()) {
            return this.getPage().getPageName();
        }

        HttpServletRequest request = this.getServletRequest();
        String ip = request.getRemoteAddr();
        MyVisit visit = this.getMyVisit();
        String username = visit.getUsername();
        String title = this.getTitle();
        String content = this.getContent();
        Guestbook gb = new Guestbook();
        gb.setUserName(username);
        gb.setIp(ip);
        gb.setContent(content);
        gb.setIsClose(new Integer(0));
        gb.setParentId(new Integer(-1));
        gb.setIsTop(new Integer(0));
        gb.setBookDate(new Timestamp(new Date().getTime()));
        gb.setCreateTime(gb.getBookDate());
        gb.setTitle(title);

        this.getGuestbookService().doUpdateTopic(gb);

        this.setTitle(null);
        this.setContent(null);

        this.getPageUtil().setTotalCount((getGuestbookService().getCount()));

        throw new RedirectException(((MyEngine) this.getEngine()).getPageLinkUrl(this.getPageName()));


    }

    /**
     * 
     * （非 Javadoc）
     *
     * @see org.apache.tapestry.IExternalPage#activateExternalPage(Object[], org.apache.tapestry.IRequestCycle)
     */
    public void activateExternalPage(
            Object[] parameters,
            IRequestCycle cycle) {

    }

    public void pageBeginRender(PageEvent event) {

    }

    /**
     * 页面转至Reply
     *
     * @param cycle
     */
    public String gotoReply(IRequestCycle cycle) {
        Reply reply = (Reply) cycle.getPage("Reply");
        Object[] obj = cycle.getListenerParameters();
        reply.setParentId((Integer) obj[0]);
        return "Reply";
    }


}