forwarddispatchaction.java

一个实用工具类

/*
 * Copyright (C) butor.com. All rights reserved.
 *
 * This software is published under the terms of the GNU Library General
 * Public License (GNU LGPL), a copy of which has been included with this
 * distribution in the LICENSE.txt file. 
 */


package org.butor.web.helper;

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.butor.log.Log;

/**
 * <p>Takes the value of action mapping's parameter attribute and 
 * use it to forward the request.  This is especially handy when
 * using a generic tile.
 * </p>
 * example:
 * <pre>
 *		<action 	path="/search/tile"
 *					type="org.butor.wak.web.helper.ForwardDispatchAction"
 *					scope="request"
 *					validate="false"
 *					parameter="search_mode">
 *			<forward name="MODE_CLT" path="search.client"/>
 *			<forward name="MODE_REP" path="search.rep"/>
 * 			<forward name="MODE_SUCC" path="search.branch"/>
 * 			<forward name="MODE_FRM" path="search.firm"/>
 *		</action>
 * </pre>
 * 
 * @author 	mateusfi
 */
public class ForwardDispatchAction extends Action {

	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response)
		throws Exception {

		String parameter = mapping.getParameter();

		String value = request.getParameter(parameter);
		if (value != null) {
			return mapping.findForward(value);
		}
		
		Log.logStr(this, Log.LOG_TYPE_ERROR, "execute", "Did not find '" + value + "' forward entry");
		return null;
	}
}