/*

  * 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.servlet;

 import java.util.Enumeration;

 import java.util.Map;

 import javax.servlet.http.HttpServletRequest;

 import org.apache.myfaces.util.AbstractAttributeMap;

 /**

  * HttpServletRequest headers as Map.

  * 

  * @author Anton Koinov (latest modification by $Author$)

  * @version $Revision$ $Date$

  */

 public final class RequestHeaderMap extends AbstractAttributeMap<String>

 {

     private final HttpServletRequest _httpServletRequest;

     RequestHeaderMap(final HttpServletRequest httpServletRequest)

     {

         _httpServletRequest = httpServletRequest;

     }

     @Override

     protected String getAttribute(final String key)

     {

         return _httpServletRequest.getHeader(key);

     }

     @Override

     protected void setAttribute(final String key, final String value)

     {

         throw new UnsupportedOperationException(

             "Cannot set HttpServletRequest Header");

     }

     @Override

     protected void removeAttribute(final String key)

     {

         throw new UnsupportedOperationException(

             "Cannot remove HttpServletRequest Header");

     }

     @Override

     @SuppressWarnings("unchecked")

     protected Enumeration<String> getAttributeNames()

     {

         return _httpServletRequest.getHeaderNames();

     }

     @Override

     public void putAll(final Map<? extends String, ? extends String> t)

     {

         throw new UnsupportedOperationException();

     }

     @Override

     public void clear()

     {

         throw new UnsupportedOperationException();

     }    

 }