// FORWARD DECLARATIONS

// CLASS DECLARATION

    public:

        /**

        * Part of the two phased constuction

        *

        * @param aInterface reference of the interface 

        * @param aData reference of the wrt data object

        * @return none

        */

        static CWrtDataObserver* NewL( MLiwInterface* aInterface, CWrtData* aData );

        /**

        * Destructor

        *

        * @param none

        * @return none

        */   

        ~CWrtDataObserver();

    private :

        /**

        * Constructor

        *

        * @param none

        * @return none

        */

        CWrtDataObserver();

        /**

        * Part of the two phased construction

        *

        * @param aInterface reference of the interface

        * @param aData reference of the wrt data object

        * @return void

        */

        void ConstructL( MLiwInterface* aInterface, CWrtData* aData );

    public:  //from MLiwNotifyCallbackc

        /**

        * Handles notifications caused by an asynchronous Execute*CmdL call

        * or an event.

        *

        * @param aCmdId The service command associated to the event.

        * @param aEventId occurred event, see LiwCommon.hrh.

        * @param aEventParamList Event parameters, if any, as defined per

        *        each event.

        * @param aInParamList Input parameters, if any, given in the

        *        related HandleCommmandL.

        * @return Error code for the call back.

        */

        virtual TInt HandleNotifyL(

            TInt aCmdId,

            TInt /*aEventId*/,

            CLiwGenericParamList& aEventParamList,

            const CLiwGenericParamList& /*aInParamList*/);

    public:

        /**

        * Registers to CPS for add, delete , update and execute notifications

        * @aFilter - filter for input parameter list

        * @return void.

        */

        void RegisterL( CLiwDefaultMap* aFilter );

        /**

        * Cancel all the registered notifications. 

        * @return void.

        */

        void ReleaseL();

    private:

        // Reference of 

        // Not owned

        MLiwInterface* iInterface;

        // Reference of the wrt data

        // Not owned

        CWrtData* iData;

        // Call back error code

        TInt iError;