1/*
2 * Copyright (C) 2010 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 com.android.gallery3d.util;
18
19import com.android.gallery3d.common.Utils;
20
21import java.io.IOException;
22import java.io.InterruptedIOException;
23import java.io.OutputStream;
24
25public class InterruptableOutputStream extends OutputStream {
26
27    private static final int MAX_WRITE_BYTES = 4096;
28
29    private OutputStream mOutputStream;
30    private volatile boolean mIsInterrupted = false;
31
32    public InterruptableOutputStream(OutputStream outputStream) {
33        mOutputStream = Utils.checkNotNull(outputStream);
34    }
35
36    @Override
37    public void write(int oneByte) throws IOException {
38        if (mIsInterrupted) throw new InterruptedIOException();
39        mOutputStream.write(oneByte);
40    }
41
42    @Override
43    public void write(byte[] buffer, int offset, int count) throws IOException {
44        int end = offset + count;
45        while (offset < end) {
46            if (mIsInterrupted) throw new InterruptedIOException();
47            int bytesCount = Math.min(MAX_WRITE_BYTES, end - offset);
48            mOutputStream.write(buffer, offset, bytesCount);
49            offset += bytesCount;
50        }
51    }
52
53    @Override
54    public void close() throws IOException {
55        mOutputStream.close();
56    }
57
58    @Override
59    public void flush() throws IOException {
60        if (mIsInterrupted) throw new InterruptedIOException();
61        mOutputStream.flush();
62    }
63
64    public void interrupt() {
65        mIsInterrupted = true;
66    }
67}
68