viewforumlinkaction.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.*;
import org.redsoft.forum.ForumConstants;
import org.redsoft.forum.dao.DAOFactory;
import org.redsoft.forum.dao.ForumDAO;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;



/**
 * A actino that wraps the link to viewForum.jsp
 *
 * @author Charles Huang
 *
 * @version 1.0
 */
public class ViewForumLinkAction extends Action {

    public ActionForward execute(ActionMapping mapping,
				 ActionForm form,
				 HttpServletRequest request,
				 HttpServletResponse response)
	throws IOException, ServletException {
		ActionErrors errors = new ActionErrors();

		String forumID =request.getParameter( ForumConstants.FORUM_ID_PARAM );

        if( forumID == null || forumID.equals("") ){
            errors.add(ActionErrors.GLOBAL_ERROR,
                    new ActionError("error.forumID.invalid"));
        } else {
            validateForumID( forumID, errors );
        }

		// Report any errors we have discovered back to the original form
		if (!errors.isEmpty()) {
            saveErrors(request, errors);
            return (mapping.findForward("error"));
		}
		request.setAttribute( ForumConstants.FORUM_ID_PARAM, forumID );

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

	private void validateForumID( final String forumID, final ActionErrors errors ){
		int forum = Integer.parseInt( forumID );
        final ForumDAO forumDAO = DAOFactory.getInstance().getForumDAO();
		if( forum > forumDAO.getForumCategory().length ){
				errors.add(ActionErrors.GLOBAL_ERROR,
		                  new ActionError("error.forumID.invalid"));
		}
	}
}