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 }