Android Open Source - final_app Decode Thread

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CC0 1.0 Universal Statement of Purpose The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent...

Java Source Code

/*
 * Copyright (C) 2008 ZXing authors/*from   ww  w  .ja  v  a2 s.  co  m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android;

import java.util.Collection;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.Map;
import java.util.concurrent.CountDownLatch;

import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Looper;
import android.preference.PreferenceManager;
import android.util.Log;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.ResultPointCallback;

/**
 * This thread does all the heavy lifting of decoding the images.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
final class DecodeThread extends Thread {

  public static final String BARCODE_BITMAP = "barcode_bitmap";
  public static final String BARCODE_SCALED_FACTOR = "barcode_scaled_factor";

  private final CaptureActivity activity;
  private final Map<DecodeHintType, Object> hints;
  private Handler handler;
  private final CountDownLatch handlerInitLatch;

  DecodeThread(CaptureActivity activity, Collection<BarcodeFormat> decodeFormats, Map<DecodeHintType, ?> baseHints, String characterSet,
      ResultPointCallback resultPointCallback) {

    this.activity = activity;
    handlerInitLatch = new CountDownLatch(1);

    hints = new EnumMap<DecodeHintType, Object>(DecodeHintType.class);
    if (baseHints != null) {
      hints.putAll(baseHints);
    }

    // The prefs can't change while the thread is running, so pick them up once here.
    if (decodeFormats == null || decodeFormats.isEmpty()) {
      SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
      decodeFormats = EnumSet.noneOf(BarcodeFormat.class);
      if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_1D, false)) {
        decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
      }
      if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_QR, false)) {
        decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
      }
      if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_DATA_MATRIX, false)) {
        decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
      }
    }
    hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);

    if (characterSet != null) {
      hints.put(DecodeHintType.CHARACTER_SET, characterSet);
    }
    hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
    Log.i("DecodeThread", "Hints: " + hints);
  }

  Handler getHandler() {
    try {
      handlerInitLatch.await();
    } catch (InterruptedException ie) {
      // continue?
    }
    return handler;
  }

  @Override
  public void run() {
    Looper.prepare();
    handler = new DecodeHandler(activity, hints);
    handlerInitLatch.countDown();
    Looper.loop();
  }

}

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