/*
    * ====================================================================
    * 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.impl.execchain;
  
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.Proxy;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpEntityEnclosingRequest;
  import org.apache.http.HttpRequest;
  import org.apache.http.HttpResponse;
  import org.apache.http.annotation.NotThreadSafe;
  import org.apache.http.client.methods.CloseableHttpResponse;
  
  /**
   * Execution proxies for HTTP message objects.
   *
   * @since 4.3
   */
  @NotThreadSafe
  class Proxies {
  
      static void enhanceEntity(final HttpEntityEnclosingRequest request) {
          final HttpEntity entity = request.getEntity();
          if (entity != null && !entity.isRepeatable() && !isEnhanced(entity)) {
              final HttpEntity proxy = (HttpEntity) Proxy.newProxyInstance(
                      HttpEntity.class.getClassLoader(),
                      new Class<?>[] { HttpEntity.class },
                      new RequestEntityExecHandler(entity));
              request.setEntity(proxy);
          }
      }
  
      static boolean isEnhanced(final HttpEntity entity) {
          if (entity != null && Proxy.isProxyClass(entity.getClass())) {
              final InvocationHandler handler = Proxy.getInvocationHandler(entity);
              return handler instanceof RequestEntityExecHandler;
          } else {
              return false;
          }
      }
  
      static boolean isRepeatable(final HttpRequest request) {
          if (request instanceof HttpEntityEnclosingRequest) {
              final HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity();
              if (entity != null) {
                  if (isEnhanced(entity)) {
                      final RequestEntityExecHandler handler = (RequestEntityExecHandler)
                              Proxy.getInvocationHandler(entity);
                      if (!handler.isConsumed()) {
                          return true;
                      }
                  }
                  return entity.isRepeatable();
              }
          }
          return true;
      }
  
      public static CloseableHttpResponse enhanceResponse(
              final HttpResponse original,
              final ConnectionHolder connHolder) {
          return (CloseableHttpResponse) Proxy.newProxyInstance(
                  ResponseProxyHandler.class.getClassLoader(),
                  new Class<?>[] { CloseableHttpResponse.class },
                  new ResponseProxyHandler(original, connHolder));
      }
  
  }