/*
    * ====================================================================
    * 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.client;
  
  import java.io.IOException;
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Proxy;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpResponse;
  import org.apache.http.annotation.NotThreadSafe;
  import org.apache.http.client.methods.CloseableHttpResponse;
  import org.apache.http.util.EntityUtils;
  
  /**
   * @since 4.3
   */
  @NotThreadSafe
  class CloseableHttpResponseProxy implements InvocationHandler {
  
      private final HttpResponse original;
  
      CloseableHttpResponseProxy(final HttpResponse original) {
          super();
          this.original = original;
      }
  
      public void close() throws IOException {
          final HttpEntity entity = this.original.getEntity();
          EntityUtils.consume(entity);
      }
  
      public Object invoke(
              final Object proxy, final Method method, final Object[] args) throws Throwable {
          final String mname = method.getName();
          if (mname.equals("close")) {
              close();
              return null;
          } else {
              try {
                  return method.invoke(original, args);
              } catch (final InvocationTargetException ex) {
                  final Throwable cause = ex.getCause();
                  if (cause != null) {
                      throw cause;
                  } else {
                      throw ex;
                  }
              }
          }
      }
  
      public static CloseableHttpResponse newProxy(final HttpResponse original) {
          return (CloseableHttpResponse) Proxy.newProxyInstance(
                  CloseableHttpResponseProxy.class.getClassLoader(),
                  new Class<?>[] { CloseableHttpResponse.class },
                  new CloseableHttpResponseProxy(original));
      }
  
  }