/*
 * $Id: Controller.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;

import java.io.IOException;

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

/**
 * A controller is a piece of code called before rendering a jsp page.
 * A controller can be associated to a tile. See <insert> or 
 * <definition> for association syntax.
 */
public interface Controller {

	/**
	 * Method associated to a tile and called immediately before the tile 
     * is included.
	 * @param tileContext Current tile context.
	 * @param request Current request
	 * @param response Current response
	 * @param servletContext Current servlet context
     * @deprecated Use execute() instead.  This will be removed after 
     * Struts 1.2.
	 */
	public void perform(
		ComponentContext tileContext,
		HttpServletRequest request,
		HttpServletResponse response,
		ServletContext servletContext)
		throws ServletException, IOException;
        
    /**
     * Method associated to a tile and called immediately before the tile 
     * is included.
     * @param tileContext Current tile context.
     * @param request Current request
     * @param response Current response
     * @param servletContext Current servlet context
     */
    public void execute(
        ComponentContext tileContext,
        HttpServletRequest request,
        HttpServletResponse response,
        ServletContext servletContext)
        throws Exception;
}