/*

  * 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.myfaces.context;

 import javax.faces.FacesException;

 import javax.faces.FactoryFinder;

 import javax.faces.context.ExternalContext;

 import javax.faces.context.ExternalContextFactory;

 import javax.faces.context.FlashFactory;

 import javax.servlet.ServletContext;

 import javax.servlet.ServletRequest;

 import javax.servlet.ServletResponse;

 import org.apache.myfaces.context.servlet.ServletExternalContextImpl;

 /**

  * @author Leonardo Uribe (latest modification by $Author$)

  * @version $Revision$ $Date$

  * 

  * @since 2.0

  */

 public class ExternalContextFactoryImpl extends ExternalContextFactory

 {

     public static final String EXTERNAL_CONTEXT_KEY = 

         "org.apache.myfaces.context.servlet.ServletExternalContextImpl";

     private final FlashFactory _flashFactory;

     public ExternalContextFactoryImpl()

     {

         _flashFactory = (FlashFactory) FactoryFinder.getFactory(

                     FactoryFinder.FLASH_FACTORY);

     }

     @Override

     public ExternalContext getExternalContext(Object context, Object request,

             Object response) throws FacesException

     {

         if (context == null)

         {

             throw new NullPointerException("context");

         }

         if (request == null)

         {

             throw new NullPointerException("request");

         }

         if (response == null)

         {

             throw new NullPointerException("response");

         }

         if (context instanceof ServletContext)

         {

             ExternalContext externalContext = new ServletExternalContextImpl(

                     (ServletContext) context, (ServletRequest) request, (ServletResponse) response,

                     _flashFactory);

             externalContext.getRequestMap().put(EXTERNAL_CONTEXT_KEY, externalContext);

             return externalContext;

         }

         throw new FacesException("Unsupported context type " + context.getClass().getName());

     }

 }