/*

  * 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 javax.faces.context;

 /**

  * Stores the first instance of the ExternalContext in the

  * field _firstInstance. We cannot put this field directly

  * into ExternalContext, because this can cause classloading

  * problems when accessing it from myfaces-impl when Mojarra is

  * also on the classpath.

  */

 final class _MyFacesExternalContextHelper

 {

     /**

      * This variable holds the firstInstance where all ExternalContext

      * objects should call when new jsf 2.0 methods are called.

      * 

      * This variable is an implementation detail and should be 

      * initialized and released on FacesContextFactoryImpl (because

      * this is the place where ExternalContextFactory.getExternalContext()

      * is called).

      * 

      * The objective of this is keep compatibility of libraries that wrap 

      * ExternalContext objects before 2.0. It is similar as FacesContext._firstInstace,

      * but since we don't have any place to init and release this variable properly

      * we should do it using reflection.

      */

     static ThreadLocal<ExternalContext> firstInstance = new ThreadLocal<ExternalContext>();

     /**

      * this class should not be instantiated.

      */

     private _MyFacesExternalContextHelper()

     {

     }

 }