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#ifndef SENSORBACKENDSYM_H
#define SENSORBACKENDSYM_H

// QT Mobility Sensor API headers
#include <qsensorbackend.h>

// Standard Symbian Headers
#include <e32std.h>
#include <e32cmn.h>

// Sensor client headers
// Common Sensor Headers
#include <sensrvchannel.h>
#include <sensrvchannelinfo.h>
#include <sensrvtypes.h>
#include <sensrvchannelfinder.h>
#include <sensrvdatalistener.h>
#include <sensrvpropertylistener.h> 

// Internal Headers
#include "sensorbackenddatasym.h"

QTM_USE_NAMESPACE

class CSensorBackendSym : public CBase, public QSensorBackend, public MSensrvDataListener, public MSensrvPropertyListener
    {
    public:
        // From QSensorBackend
        
        /**
         *  start is used to start listening to the sensor
         */
        virtual void start();
        
        /*
         * stop is used to stop listening to the sensor
         */
        virtual void stop();
        
        /*
         * Backend Destructor
         */
        ~CSensorBackendSym();

        // From MSensrvDataListener
        
        /*
         * DataReceived is called by the Sensor Server when ever data is available in the
         * sensor buffer
         */
        void  DataReceived(CSensrvChannel &aChannel, TInt aCount, TInt aDataLost);
        
        /**
         * DataError is called to indicate an error, fatal errors are inrecoverable
         */
        void  DataError(CSensrvChannel &aChannel, TSensrvErrorSeverity aError);
        
        /*
         * GetDataListenerInterfaceL is used to get a pointer to the sensor server backend
         * It is not required for QT Mobility Sensors API
         */
        void  GetDataListenerInterfaceL(TUid aInterfaceUid, TAny *&aInterface);
        
        // From MSensrvProeprtyListener        
        
        /**
         * Notification about the changed value of a property.
         */
        void  PropertyChanged (CSensrvChannel &aChannel, const TSensrvProperty &aChangedProperty);
           
        /**
         *  Property listening failed.
         */
        void  PropertyError (CSensrvChannel &aChannel, TSensrvErrorSeverity aError);
          
        /**
         * Set a listener for the indication, if the setting of the property succeeded.
         */ 
        void  SetPropertySuccessIndicationChanged (TSetPropertySuccessIndicator aIndication);
           
        /*
         * Returns a pointer to a specified interface extension - to allow future extension of this class without breaking binary compatibility.
         */
        void  GetPropertyListenerInterfaceL (TUid aInterfaceUid, TAny *&aInterface);
        
        /*
         * To enable/disable data/property listening
         */ 
        void SetListening(TBool aDataListening, TBool aPropertyListening);
            
    protected:
        
        /*
         * Default C++ constructor
         */
        CSensorBackendSym(QSensor *sensor);
        
        /**
         * Deriving class implements this if it requires property change notification
         */
        virtual void HandlePropertyChange(CSensrvChannel &aChannel, const TSensrvProperty &aChangedProperty);
        
        /*
         * RecvData is used to retrieve the sensor reading from sensor server
         * It is implemented the the sensor concrete class and handles sensor specific
         * reading data and provides conversion and utility code
         */
        virtual void RecvData(CSensrvChannel &aChannel) = 0;
        
        /*
         * InitializeL is used to create and init the sensor server objects
         */ 
        void InitializeL();
        
        /*
         * Close is used to release all the sensor server objects
         * May change when error handling is supported by mobility apis
         */
        TInt Close();
        
        /*
         * FindSensorL is used to find if a specific sensor is available on the
         * device, if FindSensorL leaves then the sensor is not supported
         */
        void FindSensorL();
        
        /*
         * OpenSensorChannelL is used to open the channel for sensor as indicated by
         * iPrivateData.iChannelInfo
         */
        void OpenSensorChannelL();
        
        /*
         * CloseSensorChannel is used to close the sensor channel and release the
         * resources
         */
        void CloseSensorChannelL();
        
        /*
         * Used to start listening to the sensor
         */
        void StartListeningL();
        
        /*
         * Used to stop listening to the sensor
         */
        void StopListeningL();
        
        /*
         * timerEvent is called when timer expires, this is used for supporting time based
         * sensor update policies
         */
        void timerEvent(QTimerEvent *aTimerEvent);

    protected:
        TSensorBackendDataSym iBackendData;
    };

#endif //SENSORBACKENDSYM_H

