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 import org.apache.http.util.Args;
37
38 /**
39 * {@link InputStream} adaptor for {@link ContentInputBuffer}.
40 *
41 * @since 4.0
42 */
43 @NotThreadSafe
44 public class ContentInputStream extends InputStream {
45
46 private final ContentInputBuffer buffer;
47
48 public ContentInputStream(final ContentInputBuffer buffer) {
49 super();
50 Args.notNull(buffer, "Input buffer");
51 this.buffer = buffer;
52 }
53
54 @Override
55 public int available() throws IOException {
56 if (this.buffer instanceof BufferInfo) {
57 return ((BufferInfo) this.buffer).length();
58 } else {
59 return super.available();
60 }
61 }
62
63 @Override
64 public int read(final byte[] b, final int off, final int len) throws IOException {
65 return this.buffer.read(b, off, len);
66 }
67
68 @Override
69 public int read(final byte[] b) throws IOException {
70 if (b == null) {
71 return 0;
72 }
73 return this.buffer.read(b, 0, b.length);
74 }
75
76 @Override
77 public int read() throws IOException {
78 return this.buffer.read();
79 }
80
81 @Override
82 public void close() throws IOException {
83 // read and discard the remainder of the message
84 final byte tmp[] = new byte[1024];
85 while (this.buffer.read(tmp, 0, tmp.length) >= 0) {
86 }
87 super.close();
88 }
89
90 }