/*
    * ====================================================================
    * 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.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import org.apache.http.Header;
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpEntityEnclosingRequest;
  import org.apache.http.HttpRequest;
  
  /**
   * A Proxy class for {@link org.apache.http.HttpEntity} enclosed in a request message.
   *
   * @since 4.3
   */
  class RequestEntityProxy implements HttpEntity  {
  
      static void enhance(final HttpEntityEnclosingRequest request) {
          final HttpEntity entity = request.getEntity();
          if (entity != null && !entity.isRepeatable() && !isEnhanced(entity)) {
              request.setEntity(new RequestEntityProxy(entity));
          }
      }
  
      static boolean isEnhanced(final HttpEntity entity) {
          return entity instanceof RequestEntityProxy;
      }
  
      static boolean isRepeatable(final HttpRequest request) {
          if (request instanceof HttpEntityEnclosingRequest) {
              final HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity();
              if (entity != null) {
                  if (isEnhanced(entity)) {
                      final RequestEntityProxy/../org/apache/http/impl/execchain/RequestEntityProxy.html#RequestEntityProxy">RequestEntityProxy proxy = (RequestEntityProxy) entity;
                      if (!proxy.isConsumed()) {
                          return true;
                      }
                  }
                  return entity.isRepeatable();
              }
          }
          return true;
      }
  
      private final HttpEntity original;
      private boolean consumed = false;
  
      RequestEntityProxy(final HttpEntity original) {
          super();
          this.original = original;
      }
  
      public HttpEntity getOriginal() {
          return original;
      }
  
      public boolean isConsumed() {
          return consumed;
      }
  
      @Override
      public boolean isRepeatable() {
          return original.isRepeatable();
      }
  
      @Override
      public boolean isChunked() {
          return original.isChunked();
      }
  
      @Override
      public long getContentLength() {
         return original.getContentLength();
     }
 
     @Override
     public Header getContentType() {
         return original.getContentType();
     }
 
     @Override
     public Header getContentEncoding() {
         return original.getContentEncoding();
     }
 
     @Override
     public InputStream getContent() throws IOException, IllegalStateException {
         return original.getContent();
     }
 
     @Override
     public void writeTo(final OutputStream outStream) throws IOException {
         consumed = true;
         original.writeTo(outStream);
     }
 
     @Override
     public boolean isStreaming() {
         return original.isStreaming();
     }
 
     @Override
     public void consumeContent() throws IOException {
         consumed = true;
         original.consumeContent();
     }
 
     @Override
     public String toString() {
         final StringBuilder sb = new StringBuilder("RequestEntityProxy{");
         sb.append(original);
         sb.append('}');
         return sb.toString();
     }
 
 }