relayaction.java

jGossip是一个简单而功能强大的Java论坛软件（消息板）

/*
 * $$Id: RelayAction.java,v 1.3 2004/05/31 12:00:08 bel70 Exp $$
 *
 * ***** BEGIN LICENSE BLOCK *****
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License
 * at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and
 * limitations under the License.
 *
 * The Original Code is JGossip forum code.
 *
 * The Initial Developer of the Original Code is the JResearch, Org.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *              Dmitry Belov <[e-mail]>
 *
 * ***** END LICENSE BLOCK ***** */
/*
 * Created on 27.05.2004
 *
 */
package org.jresearch.gossip.actions;

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

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.jresearch.gossip.exception.SystemException;

/**
 * @author dbelov
 *  
 */
public class RelayAction extends Action {

    public static final String DISPATCH_PARAM = "dispatch";

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.struts.action.Action#execute(org.apache.struts.action.ActionMapping,
     *      org.apache.struts.action.ActionForm,
     *      javax.servlet.http.HttpServletRequest,
     *      javax.servlet.http.HttpServletResponse)
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        String dispatch = request.getParameter(DISPATCH_PARAM);
        if (dispatch == null || dispatch.equals("")) { throw new SystemException(
                new NullPointerException("dispatch param can't be empty")); }
        ActionForward forward = mapping.findForward(request
                .getParameter(DISPATCH_PARAM));
        if (forward == null) { throw new SystemException(
                new NullPointerException(" forward '" + dispatch
                        + "' not found")); }
        return forward;

    }

}