/*
    * 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.jetspeed.container.invoker;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletRequestWrapper;
  
  /***
   * Local servlet request wrapper. The purpose of this wrapper is to hold 
   * attribute information that is need for each request.  In a threaded environment, 
   * each thread needs to have its own copy of this information so that there is 
   * not a timing issue with the original request object.  
   * Also, since the original request is no longer "holding" the attributes, 
   * there is no reason to remove them in the finally block.  
   * The LocalServletRequest object is automatically garbage collected at then 
   * end of this method.
   *
   * @author <a href="mailto:david@bluesunrise.com">David Sean Taylor</a>
   * @author <a href="">David Gurney</a>
   * @version $Id: $
   */
  public class LocalServletRequest extends HttpServletRequestWrapper
  {
      private Map attributeMap = new HashMap();
  
      private HttpServletRequest originalRequest = null;
  
      public LocalServletRequest(HttpServletRequest request)
      {
          super(request);
          originalRequest = request;
      }
  
      public Object getAttribute(String p_sKey)
      {
          Object a_oValue = attributeMap.get(p_sKey);
          if (a_oValue == null)
          {
              a_oValue = originalRequest.getAttribute(p_sKey);
          }
  
          return a_oValue;
      }
  
      public void removeAttribute(String key)
      {
          Object value = attributeMap.remove(key);
          if (value == null)
          {
              originalRequest.removeAttribute(key);
          }
      }
  
      public void setAttribute(String key, Object value)
      {
          attributeMap.put(key, value);
      }
  
  }