//
   //  ========================================================================
   //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.client;
  
  import java.io.IOException;
  
  import org.eclipse.jetty.http.HttpFields;
  import org.eclipse.jetty.io.Buffer;
  
  /**
   * An exchange that retains response status and response headers for later use.
   */
  public class CachedExchange extends HttpExchange
  {
      private final HttpFields _responseFields;
      private volatile int _responseStatus;
  
      /**
       * Creates a new CachedExchange.
       *
       * @param cacheHeaders true to cache response headers, false to not cache them
       */
      public CachedExchange(boolean cacheHeaders)
      {
          _responseFields = cacheHeaders ? new HttpFields() : null;
      }
  
      public synchronized int getResponseStatus()
      {
          if (getStatus() < HttpExchange.STATUS_PARSING_HEADERS)
              throw new IllegalStateException("Response not received yet");
          return _responseStatus;
      }
  
      public synchronized HttpFields getResponseFields()
      {
          if (getStatus() < HttpExchange.STATUS_PARSING_CONTENT)
              throw new IllegalStateException("Headers not completely received yet");
          return _responseFields;
      }
  
      @Override
      protected synchronized void onResponseStatus(Buffer version, int status, Buffer reason) throws IOException
      {
          _responseStatus = status;
          super.onResponseStatus(version, status, reason);
      }
  
      @Override
      protected synchronized void onResponseHeader(Buffer name, Buffer value) throws IOException
      {
          if (_responseFields != null)
          {
              _responseFields.add(name, value.asImmutableBuffer());
          }
          
          super.onResponseHeader(name, value);
      }
  }