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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.nio.entity;
29  
30  import java.io.IOException;
31  import java.io.InputStream;
32  import java.io.OutputStream;
33  import java.nio.ByteBuffer;
34  import java.nio.channels.Channels;
35  import java.nio.channels.ReadableByteChannel;
36  
37  import org.apache.http.HttpEntity;
38  import org.apache.http.entity.HttpEntityWrapper;
39  import org.apache.http.nio.ContentEncoder;
40  import org.apache.http.nio.IOControl;
41  
42  /**
43   * {@link ProducingNHttpEntity} compatibility adaptor for blocking HTTP
44   * entities.
45   *
46   * @since 4.0
47   *
48   * @deprecated (4.2) use {@link EntityAsyncContentProducer}
49   */
50  @Deprecated
51  public class NHttpEntityWrapper
52      extends HttpEntityWrapper implements ProducingNHttpEntity {
53  
54      private final ReadableByteChannel channel;
55      private final ByteBuffer buffer;
56  
57      public NHttpEntityWrapper(final HttpEntity httpEntity) throws IOException {
58          super(httpEntity);
59          this.channel = Channels.newChannel(httpEntity.getContent());
60          this.buffer = ByteBuffer.allocate(4096);
61      }
62  
63      /**
64       * This method throws {@link UnsupportedOperationException}.
65       */
66      @Override
67      public InputStream getContent() throws IOException, UnsupportedOperationException {
68          throw new UnsupportedOperationException("Does not support blocking methods");
69      }
70  
71      @Override
72      public boolean isStreaming() {
73          return true;
74      }
75  
76      /**
77       * This method throws {@link UnsupportedOperationException}.
78       */
79      @Override
80      public void writeTo(final OutputStream out) throws IOException, UnsupportedOperationException {
81          throw new UnsupportedOperationException("Does not support blocking methods");
82      }
83  
84      public void produceContent(
85              final ContentEncoder encoder,
86              final IOControl ioctrl) throws IOException {
87          final int i = this.channel.read(this.buffer);
88          this.buffer.flip();
89          encoder.write(this.buffer);
90          final boolean buffering = this.buffer.hasRemaining();
91          this.buffer.compact();
92          if (i == -1 && !buffering) {
93              encoder.complete();
94              this.channel.close();
95          }
96      }
97  
98      public void finish() {
99          try {
100             this.channel.close();
101         } catch (final IOException ignore) {
102         }
103     }
104 
105 }