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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.hc.core5.http.nio.entity;
29  
30  import java.io.IOException;
31  import java.io.InputStream;
32  
33  import org.apache.hc.core5.util.Args;
34  
35  /**
36   * {@link InputStream} adaptor for {@link ContentInputBuffer}.
37   *
38   * @since 4.0
39   */
40  public class ContentInputStream extends InputStream {
41  
42      private final ContentInputBuffer buffer;
43  
44      public ContentInputStream(final ContentInputBuffer buffer) {
45          super();
46          Args.notNull(buffer, "Input buffer");
47          this.buffer = buffer;
48      }
49  
50      @Override
51      public int available() throws IOException {
52          return this.buffer.length();
53      }
54  
55      @Override
56      public int read(final byte[] b, final int off, final int len) throws IOException {
57          return this.buffer.read(b, off, len);
58      }
59  
60      @Override
61      public int read(final byte[] b) throws IOException {
62          if (b == null) {
63              return 0;
64          }
65          return this.buffer.read(b, 0, b.length);
66      }
67  
68      @Override
69      public int read() throws IOException {
70          return this.buffer.read();
71      }
72  
73      @Override
74      public void close() throws IOException {
75          // read and discard the remainder of the message
76          final byte[] tmp = new byte[1024];
77          while (this.buffer.read(tmp, 0, tmp.length) >= 0) {
78          }
79          super.close();
80      }
81  
82  }