1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package util.build;
18
19import java.io.IOException;
20import java.io.InputStream;
21import java.io.OutputStream;
22
23import javax.annotation.Nonnull;
24
25/**
26 * Class that continuously read an {@link InputStream} and optionally could write the input in a
27 * {@link OutputStream}.
28 */
29public class BytesStreamSucker {
30
31  private static final int BUFFER_SIZE = 4096;
32
33  @Nonnull
34  private final byte[] buffer = new byte[BUFFER_SIZE];
35
36  @Nonnull
37  private final InputStream is;
38
39  @Nonnull
40  private final OutputStream os;
41
42  private final boolean toBeClose;
43
44  public BytesStreamSucker(
45      @Nonnull InputStream is, @Nonnull OutputStream os, boolean toBeClose) {
46    this.is = is;
47    this.os = os;
48    this.toBeClose = toBeClose;
49  }
50
51  public BytesStreamSucker(@Nonnull InputStream is, @Nonnull OutputStream os) {
52    this(is, os, false);
53  }
54
55  public void suck() throws IOException {
56    try {
57      int bytesRead;
58      while ((bytesRead = is.read(buffer)) >= 0) {
59        os.write(buffer, 0, bytesRead);
60        os.flush();
61      }
62    } finally {
63      if (toBeClose) {
64        os.close();
65      }
66    }
67  }
68}