editthreadlinkaction.java

Chinaxp 论坛源代码

/*
 * XP Forum
 *
 * Copyright (c) 2002-2003 RedSoft Group.  All rights reserved.
 *
 */
package org.redsoft.forum.web;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.redsoft.forum.ForumConstants;
import org.redsoft.forum.dao.DAOFactory;
import org.redsoft.forum.dao.PersistentThread;
import org.redsoft.forum.dao.ThreadDAO;
import org.redsoft.forum.exception.DAOException;
import org.redsoft.forum.exception.ThreadNotFoundException;
import org.redsoft.forum.dao.Thread;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * an action that wraps the link to editThread.jsp
 *
 * @@author <a href="mailto:[e-mail]">cinc</a>
 *
 * @@version $Id: EditThreadLinkAction.java,v 1.3 2004/02/26 03:05:37 mustang Exp $
 *
 */
public class EditThreadLinkAction extends Action {

    /**
     *
     * @param mapping
     * @param form
     * @param request
     * @param response
     * @return
     * @throws ThreadNotFoundException      if a thread is not found,
     *                                      handle this exception in strust-config.xml
     * @throws DAOException     if error accessing database
     *                                      handle this exception in strust-config.xml
     */
    public ActionForward execute(ActionMapping mapping,
				 ActionForm form,
				 HttpServletRequest request,
				 HttpServletResponse response)
	throws ThreadNotFoundException, DAOException {

		final String threadID = request.getParameter(ForumConstants.THREAD_ID_PARAM);
		if ((threadID == null) || (threadID.equals(""))) {
            throw new ThreadNotFoundException( "with null id" );
		} else {
            final ThreadDAO dao = DAOFactory.getInstance().getThreadDAO();
            final PersistentThread thread = dao.findByUID( Long.parseLong( threadID ) );
            // Return a immutable thread object back to jsp instead of a mutable PersistentThread object
            request.setAttribute( ForumConstants.MY_THREAD_PARAM,
                    new Thread( thread.getTitle(),
                            thread.getContent(),
                            thread.isNotify() ));
		}

        // Forward control to the specified success URI
		return (mapping.findForward("success"));
    }

}