/*
 * $Id: UrlController.java 471754 2006-11-06 14:55:09Z husted $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Tiles controller including a local URL.
 */
public class UrlController implements Controller {

    /**
     * URL associated with this controller.
     */
    protected String url = null;

    /**
     * Constructor.
     * @param url URL.
     */
    public UrlController(String url) {
        this.url = url;
    }

    /**
     * Method associated to a tile and called immediately before the tile
     * is included.  This implementation calls an <code>Action</code>.
     * No servlet is set by this method.
     *
     * @param tileContext Current tile context.
     * @param request Current request.
     * @param response Current response.
     * @param servletContext Current servlet context.
     */
    public void perform(
        ComponentContext tileContext,
        HttpServletRequest request,
        HttpServletResponse response,
        ServletContext servletContext)
        throws ServletException, IOException {

        RequestDispatcher rd = servletContext.getRequestDispatcher(url);
        if (rd == null) {
            throw new ServletException(
                "Controller can't find url '" + url + "'.");
        }

        rd.include(request, response);
    }

    /**
     * @see org.apache.struts.tiles.Controller#execute(org.apache.struts.tiles.ComponentContext, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, javax.servlet.ServletContext)
     */
    public void execute(
        ComponentContext tileContext,
        HttpServletRequest request,
        HttpServletResponse response,
        ServletContext servletContext)
        throws Exception {

        RequestDispatcher rd = servletContext.getRequestDispatcher(url);
        if (rd == null) {
            throw new ServletException(
                "Controller can't find url '" + url + "'.");
        }

        rd.include(request, response);

    }

}