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// Internal Headers

#include "magnetometersensorsym.h"

/**

 * set the id of the magnetometer sensor

 */

const char *CMagnetometerSensorSym::id("sym.magnetometer");

/**

 * Factory function, this is used to create the magnetometer sensor object

 * @return CMagnetometerSensorSym if successful, leaves on failure

 */

CMagnetometerSensorSym* CMagnetometerSensorSym::NewL(QSensor *sensor)

    {

    CMagnetometerSensorSym* self = new (ELeave) CMagnetometerSensorSym(sensor);

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop();

    return self;    

    }

/**

 * Destructor

 * Closes the backend resources

 */

CMagnetometerSensorSym::~CMagnetometerSensorSym()

    {

    //Closes the backend resources

    Close();

    }

/**

 * Default constructor

 */

CMagnetometerSensorSym::CMagnetometerSensorSym(QSensor *sensor):CSensorBackendSym(sensor),

        iCalibrationLevel(0.0)

    {

    if(sensor)

        {

        setReading<QMagnetometerReading>(&iReading);

        }

    iBackendData.iSensorType = KSensrvChannelTypeIdMagnetometerXYZAxisData;    

    //Enable Property listening, required to get Calibration level

    SetListening(ETrue, ETrue);

    }

/**

 * start is overridden to allow retrieving initial calibration property before

 * and to set the required value type flags

 */

void CMagnetometerSensorSym::start()

    {

    if(sensor())

        {

        // Initialize the values

        iReading.setX(0);

        iReading.setY(0);

        iReading.setZ(0);

        // Set the required type of values

        QVariant v = sensor()->property("returnGeoValues");

        iReturnGeoValues = (v.isValid() && v.toBool()); // if the property isn't set it's false

        }

    // get current property value for calibration and set it to reading

    TSensrvProperty calibration;

    TRAPD(err, iBackendData.iSensorChannel->GetPropertyL(KSensrvPropCalibrationLevel,ESensrvSingleProperty, calibration));

    // If error in getting the calibration level, continue to start the sensor

    // as it is not a fatal error

    if ( err == KErrNone )

        {

        TInt calibrationVal;

        calibration.GetValue(calibrationVal);

        iCalibrationLevel = calibrationVal * (1.0/3.0);

        }

    // Call backend start

    CSensorBackendSym::start();

    }

/*

 * RecvData is used to retrieve the sensor reading from sensor server

 * It is implemented here to handle magnetometer sensor specific

 * reading data and provides conversion and utility code

 */ 

void CMagnetometerSensorSym::RecvData(CSensrvChannel &aChannel)

    {

    TPckg<TSensrvMagnetometerAxisData> magnetometerpkg( iData );

    TInt ret = aChannel.GetData( magnetometerpkg );

    if(KErrNone != ret)

        {

        // If there is no reading available, return without setting

        return;

        }

    // Get a lock on the reading data

    iBackendData.iReadingLock.Wait();

    // If Geo values are requested set it

    if(iReturnGeoValues)

        {

        iReading.setX(iData.iAxisXCalibrated);

        iReading.setY(iData.iAxisYCalibrated);

        iReading.setZ(iData.iAxisZCalibrated);

        }

    // If Raw values are requested set it

    else

        {

        iReading.setX(iData.iAxisXRaw);

        iReading.setY(iData.iAxisYRaw);

        iReading.setZ(iData.iAxisZRaw);

        }

    // Set the timestamp

    iReading.setTimestamp(iData.iTimeStamp.Int64());

    // Set the calibration level

    iReading.setCalibrationLevel(iCalibrationLevel);

    // Release the lock

    iBackendData.iReadingLock.Signal();

    }

/**

 * HandlePropertyChange is called from backend, to indicate a change in property

 */

void CMagnetometerSensorSym::HandlePropertyChange(CSensrvChannel &/*aChannel*/, const TSensrvProperty &aChangedProperty)

    {

    if(aChangedProperty.GetPropertyId() != KSensrvPropCalibrationLevel)

        {

        // Do nothing, if calibration property has not changed

        return;

        }

    TInt calibrationlevel;

    aChangedProperty.GetValue(calibrationlevel);

    // As Qt requires calibration level in qreal but symbian provides in enum

    // It has been agreed with DS Team that the following mechanism will be

    // used till discussions with qt mobility are complete

    iCalibrationLevel = (1.0/3.0) * calibrationlevel;

    }

/*

 * Used to retrieve the current calibration level

 * iCalibrationLevel is automatically updated whenever there is a change

 * in calibration level

 */

qreal CMagnetometerSensorSym::GetCalibrationLevel()

    {

    return iCalibrationLevel;

    }

/**

 * Second phase constructor

 * Initialize the backend resources

 */

void CMagnetometerSensorSym::ConstructL()

    {

    InitializeL();

    }