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*** THIS IS AN OBSOLETE VERSION UPLOADED FOR USE WITH CEDAR-COMMON.*** The Server Library for GWT is a collection of Java server side components for the Google Web Toolkit AJAX framework with the focus on the Spring framework by facilitating publishing of Spring beans as RPC services with support for Hibernate-managed entities.

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/*
 * 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.gwtwidgets.server.spring;

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

/**
 * Utility class that allows access to the invoking servlet request and
 * response, which are stored in a thread local variable of the invoking thread.
 * 
 * @author George Georgovassilis, g.georgovassilis[at]gmail.com
 * 
 */
public class ServletUtils {
	private static ThreadLocal servletRequest = new ThreadLocal();

	private static ThreadLocal servletResponse = new ThreadLocal();

	/**
	 * Adjusts HTTP headers so that browsers won't cache response.
	 * @param response
	 * For more background see this.
	 */
	public static void disableResponseCaching(HttpServletResponse response) {
		response.setHeader("Expires", "Sat, 1 January 2000 12:00:00 GMT");
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		response.setHeader("Pragma", "no-cache");
	}

	/**
	 * Return the request which invokes the service. Valid only if used in the
	 * dispatching thread.
	 * 
	 * @return the servlet request
	 */
	public static HttpServletRequest getRequest() {
		return servletRequest.get();
	}

	/**
	 * Return the response which accompanies the request. Valid only if used in
	 * the dispatching thread.
	 * 
	 * @return the servlet response
	 */
	public static HttpServletResponse getResponse() {
		return servletResponse.get();
	}

	/**
	 * Assign the current servlet request to a thread local variable. Valid only
	 * if used inside the invoking thread scope.
	 * 
	 * @param request
	 */
	public static void setRequest(HttpServletRequest request) {
		servletRequest.set(request);
	}

	/**
	 * Assign the current servlet response to a thread local variable. Valid
	 * only if used inside the invoking thread scope.
	 * 
	 * @param response
	 */
	public static void setResponse(HttpServletResponse response) {
		servletResponse.set(response);
	}

}