content: /*
   * Copyright (C) 2014 AChep@xda <artemchep@gmail.com>
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   * MA  02110-1301, USA.
   */
  package com.achep.acdisplay.services.activemode.sensors;
  
  import android.hardware.Sensor;
  import android.hardware.SensorManager;
  import androidx.annotation.NonNull;
  import android.util.Log;
  
  import com.achep.acdisplay.services.activemode.ActiveModeSensor;
  
  import java.lang.ref.WeakReference;
  
  import uk.co.jarofgreen.lib.ShakeDetector;
  
  import static com.achep.base.Build.DEBUG;
  
  /**
   * Basing on results of accelerometer sensor it notifies when
   * {@link com.achep.acdisplay.ui.activities.AcDisplayActivity AcDisplay}
   * should be shown.
   *
   * @author Artem Chepurnoy
   */
  public final class AccelerometerSensor extends ActiveModeSensor.Consuming implements
          ShakeDetector.Listener {
  
      private static final String TAG = "AccelerometerSensor";
  
      private static WeakReference<AccelerometerSensor> sAccelerometerSensorWeak;
  
      private final ShakeDetector mShakeDetector;
  
      private AccelerometerSensor() {
          super();
          mShakeDetector = new ShakeDetector(this);
      }
  
      @NonNull
      public static AccelerometerSensor getInstance() {
          AccelerometerSensor sensor = sAccelerometerSensorWeak != null
                  ? sAccelerometerSensorWeak.get() : null;
          if (sensor == null) {
              sensor = new AccelerometerSensor();
              sAccelerometerSensorWeak = new WeakReference<>(sensor);
          }
          return sensor;
      }
  
      @Override
      public int getType() {
          return Sensor.TYPE_ACCELEROMETER;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public int getRemainingTime() {
          return 15000; // 15 sec.
      }
  
      @Override
      public void onStart(@NonNull SensorManager sensorManager) {
          if (DEBUG) Log.d(TAG, "Starting accelerometer sensor...");
  
          mShakeDetector.start(sensorManager);
      }
  
      @Override
      public void onStop() {
          if (DEBUG) Log.d(TAG, "Stopping accelerometer sensor...");
  
          mShakeDetector.stop();
      }
  
      /**
       * Called on shake detected.
       */
      @Override
      public void onShakeDetected() {
          if (DEBUG) Log.d(TAG, "Hearing shake...");
  
          requestWakeUp();
      }
  }
  