/*
 * $Id: ReloadDefinitionsAction.java 54929 2004-10-16 16:38:42Z germuska $ 
 *
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.struts.tiles.actions;

import java.io.PrintWriter;

import javax.servlet.ServletContext;
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.apache.struts.tiles.DefinitionsFactory;
import org.apache.struts.tiles.DefinitionsFactoryException;
import org.apache.struts.tiles.TilesUtil;



/**
 * <p>A standard <strong>Action</strong> that calls the
 * <code>reload()</code> method of our controller servlet to
 * reload its configuration information from the configuration
 * files (which have presumably been updated) dynamically.</p>
 *
 * @version $Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $
 */

public class ReloadDefinitionsAction extends Action {

    /**
     * Process the specified HTTP request, and create the corresponding HTTP
     * response (or forward to another web component that will create it),
     * with provision for handling exceptions thrown by the business logic.
     *
     * @param mapping The ActionMapping used to select this instance
     * @param form The optional ActionForm bean for this request (if any)
     * @param request The HTTP request we are processing
     * @param response The HTTP response we are creating
     *
     * @exception Exception if the application business logic throws
     *  an exception
     * @since Struts 1.1
     */
    public ActionForward execute(ActionMapping mapping,
                                 ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response)
        throws Exception
    {
        response.setContentType("text/plain");
        PrintWriter writer = response.getWriter();

        try {
          ServletContext context = getServlet().getServletContext();
            DefinitionsFactory factory = TilesUtil.getDefinitionsFactory(request, context);
            factory.setConfig(factory.getConfig(), context);
            writer.println("OK");
        } catch (ClassCastException e) {
            writer.println("FAIL - " + e.toString());
            getServlet().log("ReloadAction", e);
        } catch (DefinitionsFactoryException e) {
            writer.println("FAIL - " + e.toString());
            getServlet().log("ReloadAction", e);
        }

        writer.flush();
        writer.close();

        return (null);

    }

}