/*
* Copyright (C) 2012, Katy Hilgenberg.
* Special acknowledgments to: Knowledge & Data Engineering Group, University of Kassel (http://www.kde.cs.uni-kassel.de).
* Contact: sdcf@cs.uni-kassel.de
*
* This file is part of the SDCFramework (Sensor Data Collection Framework) project.
*
* The SDCFramework is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The SDCFramework 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SDCFramework. If not, see <http://www.gnu.org/licenses/>.
*/
package de.unikassel.android.sdcframework.devices;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorManager;
import de.unikassel.android.sdcframework.data.independent.MagneticFieldSampleData;
import de.unikassel.android.sdcframework.data.independent.SampleData;
import de.unikassel.android.sdcframework.devices.facade.SensorDeviceIdentifier;
/**
* Implementation of the magnetic field sensor device.
*
* @author Katy Hilgenberg
*
*/
public class MagneticFieldDevice extends AbstractAndroidSensorDevice
{
/**
* The actual sample of the device, updated whenever the handler for sensor
* changes is called
*/
private final MagneticFieldSampleData currentSampleData;
/**
* Constructor
*
* @param context
* the context
*/
public MagneticFieldDevice( Context context )
{
super( SensorDeviceIdentifier.MagneticField, Sensor.TYPE_MAGNETIC_FIELD, context,
SensorManager.SENSOR_DELAY_NORMAL );
this.currentSampleData = new MagneticFieldSampleData();
currentSampleData.setMagneticFieldX( Float.MIN_VALUE );
currentSampleData.setMagneticFieldY( Float.MIN_VALUE );
currentSampleData.setMagneticFieldZ( Float.MIN_VALUE );
}
/*
* (non-Javadoc)
*
* @see de.unikassel.android.sdcframework.devices.AbstractAndroidSensorDevice#
* getCurrentSampleData()
*/
@Override
protected final synchronized SampleData getCurrentSampleData()
{
return currentSampleData;
}
/*
* (non-Javadoc)
*
* @see de.unikassel.android.sdcframework.devices.AbstractAndroidSensorDevice#
* doHandleSensorChanged(android.hardware.SensorEvent)
*/
@Override
public final synchronized void doHandleSensorChanged( SensorEvent event )
{
if ( event.values != null && event.values.length == 3 )
{
currentSampleData.setMagneticFieldX( event.values[ 0 ] );
currentSampleData.setMagneticFieldY( event.values[ 1 ] );
currentSampleData.setMagneticFieldZ( event.values[ 2 ] );
}
}
/*
* (non-Javadoc)
*
* @see
* de.unikassel.android.sdcframework.devices.facade.SampleProvidingSensorDevice
* #hasSample()
*/
@Override
public final synchronized boolean hasSample()
{
return !( currentSampleData.getMagneticFieldX() == Float.MIN_VALUE
&& currentSampleData.getMagneticFieldY() == Float.MIN_VALUE
&& currentSampleData.getMagneticFieldZ() == Float.MIN_VALUE );
}
}