/*

* Copyright (c) 2002-2005 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Notifies the changes in central repository values.

*

*/

#ifndef CSATCENREPCHANGENOTIFIER_H

#define CSATCENREPCHANGENOTIFIER_H

//  INCLUDES

#include <e32base.h>

#include "MSatSystemStateChangeNotifier.h"

// FORWARD DECLARATION

class MSatSystemStateObserver;

class CRepository;

// CLASS DECLARATION

/**

*  Notifies the changes in central repository values.

*

*  @lib SatSystemState

*  @since Series 60 3.0

*/

class CSatCenRepChangeNotifier : public CActive,

                                 public MSatSystemStateChangeNotifier

    {

    public: // Enums

        /**

        * Identifier for the value type that is being observered.

        */

        enum TCenRepTypes

            {

            // Type is TInt

            ECRTypeInteger,

             // Type is TReal

            ECRTypeReal,

             // Type is TDesC8

            ECRTypeDesC8,

            // Type is TDesC16

            ECRTypeDesC16,

            // Type not defined

            ECRTypeUnknown

            };

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param aCenRepCategory This is the CR Category.

        * @param aCenRepId CR value id to be listened.

        * @param aObserver A class that is notified when value changes.

        * @param aCenRepType Identifies the base type of the observered value,

        *        which can be TInt, TDesC or TReal. Default is Unknown.

        */

        static CSatCenRepChangeNotifier* NewL(

            const TUid& aCenRepCategory,

            TUint32 aCenRepId,

            MSatSystemStateObserver& aObserver,

            TInt aCenRepType );

        /**

        * Destructor.

        */

        virtual ~CSatCenRepChangeNotifier();

    public: // Functions from base classes

        /**

        * From MSatSystemStateChangeNotifier Request a notification of a

        * change in system state.

        */

        void NotifyChangeL();

        /**

        * From MSatSystemStateChangeNotifier Cancels the notification request.

        */

        void CancelNotify();

    protected:  // Functions from base classes

        /**

        * From CActive

        */

        void DoCancel();

        /**

        * From CActive.

        */

        void RunL();

    private: // New methods

        /**

        * Makes the request and activates the active object.

        */

        void ActivateL();

    private:

        /**

        * C++ default constructor.

        * @param aCenRepCategory This is the CR Category.

        * @param aCenRepId CR value id to be listened.

        * @param aObserver A class that is notified when value changes.

        * @param aCenRepType Identifies the base type of the observered value

        */

        CSatCenRepChangeNotifier(

            const TUid& aCenRepCategory,

            TUint32 aCenRepId,

            MSatSystemStateObserver& aObserver,

            TInt aCenRepType );

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

    private:    // Data

        // Change observer.

        MSatSystemStateObserver& iObserver;

        // Central repository class.

        CRepository* iCenRepClient;

        // CenRep category

        TUid iCenRepCategory;

        // CenRep value to listen

        TUint32 iCenRepId;

        // CR value type

        TInt iCenRepType;

    };

#endif      // CSATCENREPCHANGENOTIFIER_H

// End of File