/*

  * FCKeditor - The text editor for Internet - http://www.fckeditor.net

  * Copyright (C) 2004-2010 Frederico Caldeira Knabben

  * 

  * == BEGIN LICENSE ==

  * 

  * Licensed under the terms of any of the following licenses at your

  * choice:

  * 

  *  - GNU General Public License Version 2 or later (the "GPL")

  *    http://www.gnu.org/licenses/gpl.html

  * 

  *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")

  *    http://www.gnu.org/licenses/lgpl.html

  * 

  *  - Mozilla Public License Version 1.1 or later (the "MPL")

  *    http://www.mozilla.org/MPL/MPL-1.1.html

  * 

  * == END LICENSE ==

  */

 package net.fckeditor.requestcycle;

 import javax.servlet.http.HttpServletRequest;

 /**

  * Maintains current {@link Context context} and {@link HttpServletRequest

  * request} instances. This container relies on {@link ThreadLocal} and provides

  * static access to the aforementioned objects for the current File Browse

  * request. This means that this class is thread-safe.

  * 

  * @version $Id: ThreadLocalData.java 4785 2009-12-21 20:10:28Z mosipov $

  */

 public class ThreadLocalData {

         private static ThreadLocal<HttpServletRequest> request = new ThreadLocal<HttpServletRequest>();

         private static ThreadLocal<Context> context = new ThreadLocal<Context>();

         /**

          * Initializes the current request cycle.

          * 

          * @param request

          *            current user request instance

          */

         public static void beginRequest(final HttpServletRequest request) {

                 if (request == null)

                         throw new NullPointerException("the request cannot be null");

                 ThreadLocalData.request.set(request);

                 ThreadLocalData.context.set(new Context(request));

         }

         /**

          * Returns the current user request instance.

          * 

          * @return the current user request instance

          */

         public static HttpServletRequest getRequest() {

                 return request.get();

         }

         /**

          * Returns the current context instance.

          * 

          * @return the current context instance

          */

         public static Context getContext() {

                 return context.get();

         }

         /**

          * Terminates the current request cycle. <br />

          * <strong>Important: To prevent memory leaks, make sure that this

          * method is called at the end of the current request cycle!</strong>

          */

         public static void endRequest() {

                 // ThreadLocal#remove is not available in Java 1.4

                 request.set(null);

                 context.set(null);

         }

 }