1/*
2 * Copyright (C) 2008 ZXing authors
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.google.zxing.client.android;
18
19import com.google.zxing.BarcodeFormat;
20import com.google.zxing.DecodeHintType;
21import com.google.zxing.ResultPointCallback;
22
23import android.os.Handler;
24import android.os.Looper;
25
26import java.util.Hashtable;
27import java.util.Vector;
28import java.util.concurrent.CountDownLatch;
29
30/**
31 * This thread does all the heavy lifting of decoding the images.
32 *
33 * @author dswitkin@google.com (Daniel Switkin)
34 */
35final class DecodeThread extends Thread {
36
37  public static final String BARCODE_BITMAP = "barcode_bitmap";
38
39  private final CaptureActivity activity;
40  private final Hashtable<DecodeHintType,Object> hints;
41  private Handler handler;
42  private final CountDownLatch handlerInitLatch;
43
44  DecodeThread(CaptureActivity activity,
45               String characterSet,
46               ResultPointCallback resultPointCallback) {
47
48    this.activity = activity;
49    handlerInitLatch = new CountDownLatch(1);
50
51    hints = new Hashtable<DecodeHintType,Object>();
52    Vector<BarcodeFormat> formats = new Vector<BarcodeFormat>();
53    formats.add(BarcodeFormat.QR_CODE);
54    hints.put(DecodeHintType.POSSIBLE_FORMATS, formats);
55
56    if (characterSet != null) {
57      hints.put(DecodeHintType.CHARACTER_SET, characterSet);
58    }
59    hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
60  }
61
62  Handler getHandler() {
63    try {
64      handlerInitLatch.await();
65    } catch (InterruptedException ie) {
66      // continue?
67    }
68    return handler;
69  }
70
71  @Override
72  public void run() {
73    Looper.prepare();
74    handler = new DecodeHandler(activity, hints);
75    handlerInitLatch.countDown();
76    Looper.loop();
77  }
78
79}
80