/*
    * ====================================================================
    * 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.nio.entity;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.nio.channels.Channels;
  import java.nio.channels.ReadableByteChannel;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.annotation.NotThreadSafe;
  import org.apache.http.entity.HttpEntityWrapper;
  import org.apache.http.nio.ContentEncoder;
  import org.apache.http.nio.IOControl;
  
  /**
   * {@link ProducingNHttpEntity} compatibility adaptor for blocking HTTP
   * entities.
   *
   * @since 4.0
   *
   * @deprecated (4.2) use {@link EntityAsyncContentProducer}
   */
  @NotThreadSafe
  @Deprecated
  public class NHttpEntityWrapper
      extends HttpEntityWrapper implements ProducingNHttpEntity {
  
      private final ReadableByteChannel channel;
      private final ByteBuffer buffer;
  
      public NHttpEntityWrapper(final HttpEntity httpEntity) throws IOException {
          super(httpEntity);
          this.channel = Channels.newChannel(httpEntity.getContent());
          this.buffer = ByteBuffer.allocate(4096);
      }
  
      /**
       * This method throws {@link UnsupportedOperationException}.
       */
      @Override
      public InputStream getContent() throws IOException, UnsupportedOperationException {
          throw new UnsupportedOperationException("Does not support blocking methods");
      }
  
      @Override
      public boolean isStreaming() {
          return true;
      }
  
      /**
       * This method throws {@link UnsupportedOperationException}.
       */
      @Override
      public void writeTo(final OutputStream out) throws IOException, UnsupportedOperationException {
          throw new UnsupportedOperationException("Does not support blocking methods");
      }
  
      /**
       * This method is equivalent to the {@link #finish()} method.
       * <br/>
       * TODO: The name of this method is misnomer. It will be renamed to
       * #finish() in the next major release.
       */
      @Override
      public void consumeContent() throws IOException {
          finish();
      }
  
      public void produceContent(
              final ContentEncoder encoder,
              final IOControl ioctrl) throws IOException {
         final int i = this.channel.read(this.buffer);
         this.buffer.flip();
         encoder.write(this.buffer);
         final boolean buffering = this.buffer.hasRemaining();
         this.buffer.compact();
         if (i == -1 && !buffering) {
             encoder.complete();
             this.channel.close();
         }
     }
 
     public void finish() {
         try {
             this.channel.close();
         } catch (final IOException ignore) {
         }
     }
 
 }