/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.http.protocol;
  
  import org.apache.http.HttpConnection;
  import org.apache.http.HttpHost;
  import org.apache.http.HttpRequest;
  import org.apache.http.HttpResponse;
  import org.apache.http.util.Args;
  
  /**
   * Implementation of {@link HttpContext} that provides convenience
   * setters for user assignable attributes and getter for readable attributes.
   *
   * @since 4.3
   */
  public class HttpCoreContext implements HttpContext {
  
      /**
       * Attribute name of a {@link org.apache.http.HttpConnection} object that
       * represents the actual HTTP connection.
       */
      public static final String HTTP_CONNECTION  = "http.connection";
  
      /**
       * Attribute name of a {@link org.apache.http.HttpRequest} object that
       * represents the actual HTTP request.
       */
      public static final String HTTP_REQUEST     = "http.request";
  
      /**
       * Attribute name of a {@link org.apache.http.HttpResponse} object that
       * represents the actual HTTP response.
       */
      public static final String HTTP_RESPONSE    = "http.response";
  
      /**
       * Attribute name of a {@link org.apache.http.HttpHost} object that
       * represents the connection target.
       */
      public static final String HTTP_TARGET_HOST = "http.target_host";
  
      /**
       * Attribute name of a {@link Boolean} object that represents the
       * the flag indicating whether the actual request has been fully transmitted
       * to the target host.
       */
      public static final String HTTP_REQ_SENT    = "http.request_sent";
  
      public static HttpCoreContext create() {
          return new HttpCoreContext(new BasicHttpContext());
      }
  
      public static HttpCoreContext adapt(final HttpContext context) {
          Args.notNull(context, "HTTP context");
          return context instanceof HttpCoreContext
                          ? (HttpCoreContext) context
                          : new HttpCoreContext(context);
      }
  
      private final HttpContext context;
  
      public HttpCoreContext(final HttpContext context) {
          super();
          this.context = context;
      }
  
      public HttpCoreContext() {
          super();
          this.context = new BasicHttpContext();
      }
  
      @Override
      public Object getAttribute(final String id) {
         return context.getAttribute(id);
     }
 
     @Override
     public void setAttribute(final String id, final Object obj) {
         context.setAttribute(id, obj);
     }
 
     @Override
     public Object removeAttribute(final String id) {
         return context.removeAttribute(id);
     }
 
     public <T> T getAttribute(final String attribname, final Class<T> clazz) {
         Args.notNull(clazz, "Attribute class");
         final Object obj = getAttribute(attribname);
         if (obj == null) {
             return null;
         }
         return clazz.cast(obj);
     }
 
     public <T extends HttpConnection> T getConnection(final Class<T> clazz) {
         return getAttribute(HTTP_CONNECTION, clazz);
     }
 
     public HttpConnection getConnection() {
         return getAttribute(HTTP_CONNECTION, HttpConnection.class);
     }
 
     public HttpRequest getRequest() {
         return getAttribute(HTTP_REQUEST, HttpRequest.class);
     }
 
     public boolean isRequestSent() {
         final Boolean b = getAttribute(HTTP_REQ_SENT, Boolean.class);
         return b != null && b.booleanValue();
     }
 
     public HttpResponse getResponse() {
         return getAttribute(HTTP_RESPONSE, HttpResponse.class);
     }
 
     public void setTargetHost(final HttpHost host) {
         setAttribute(HTTP_TARGET_HOST, host);
     }
 
     public HttpHost getTargetHost() {
         return getAttribute(HTTP_TARGET_HOST, HttpHost.class);
     }
 
 }