content: /*
   * Copyright (C) 2008 ZXing authors
   *
   * 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.decode;
  
  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;
  import com.google.zxing.config.Config;
  import com.jinlin.zxing.CaptureActivity;
  
  import java.util.Collection;
  import java.util.EnumMap;
  import java.util.EnumSet;
  import java.util.Map;
  import java.util.concurrent.CountDownLatch;
  
  /**
   * 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(Config.KEY_DECODE_1D, false)) {
  				decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
  			}
  			if (prefs.getBoolean(Config.KEY_DECODE_QR, false)) {
  				decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
  			}
  			if (prefs.getBoolean(Config.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();
  	}
  
  }
  