View Javadoc

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.annotation.NotThreadSafe;
34  import org.apache.http.io.BufferInfo;
35  import org.apache.http.nio.util.ContentInputBuffer;
36  
37  /**
38   * {@link InputStream} adaptor for {@link ContentInputBuffer}.
39   *
40   * @since 4.0
41   */
42  @NotThreadSafe
43  public class ContentInputStream extends InputStream {
44  
45      private final ContentInputBuffer buffer;
46  
47      public ContentInputStream(final ContentInputBuffer buffer) {
48          super();
49          if (buffer == null) {
50              throw new IllegalArgumentException("Input buffer may not be null");
51          }
52          this.buffer = buffer;
53      }
54  
55      @Override
56      public int available() throws IOException {
57          if (this.buffer instanceof BufferInfo) {
58              return ((BufferInfo) this.buffer).length();
59          } else {
60              return super.available();
61          }
62      }
63  
64      @Override
65      public int read(final byte[] b, int off, int len) throws IOException {
66          return this.buffer.read(b, off, len);
67      }
68  
69      @Override
70      public int read(final byte[] b) throws IOException {
71          if (b == null) {
72              return 0;
73          }
74          return this.buffer.read(b, 0, b.length);
75      }
76  
77      @Override
78      public int read() throws IOException {
79          return this.buffer.read();
80      }
81  
82      @Override
83      public void close() throws IOException {
84          // read and discard the remainder of the message
85          byte tmp[] = new byte[1024];
86          while (this.buffer.read(tmp, 0, tmp.length) >= 0) {
87          }
88          super.close();
89      }
90  
91  }