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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  
33  import org.apache.http.io.BufferInfo;
34  import org.apache.http.nio.util.ContentInputBuffer;
35  import org.apache.http.util.Args;
36  
37  /**
38   * {@link InputStream} adaptor for {@link ContentInputBuffer}.
39   *
40   * @since 4.0
41   */
42  public class ContentInputStream extends InputStream {
43  
44      private final ContentInputBuffer buffer;
45  
46      public ContentInputStream(final ContentInputBuffer buffer) {
47          super();
48          Args.notNull(buffer, "Input buffer");
49          this.buffer = buffer;
50      }
51  
52      @Override
53      public int available() throws IOException {
54          if (this.buffer instanceof BufferInfo) {
55              return ((BufferInfo) this.buffer).length();
56          } else {
57              return super.available();
58          }
59      }
60  
61      @Override
62      public int read(final byte[] b, final int off, final int len) throws IOException {
63          return this.buffer.read(b, off, len);
64      }
65  
66      @Override
67      public int read(final byte[] b) throws IOException {
68          if (b == null) {
69              return 0;
70          }
71          return this.buffer.read(b, 0, b.length);
72      }
73  
74      @Override
75      public int read() throws IOException {
76          return this.buffer.read();
77      }
78  
79      @Override
80      public void close() throws IOException {
81          // read and discard the remainder of the message
82          final byte tmp[] = new byte[1024];
83          while (this.buffer.read(tmp, 0, tmp.length) >= 0) {
84          }
85          super.close();
86      }
87  
88  }