/*

* Copyright (c) 2009 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:  Publish & Subscribe property change observer

*

*/

#ifndef CIMALERTPROPERTYOBSERVER_H

#define CIMALERTPROPERTYOBSERVER_H

//  INCLUDES

#include <e32base.h>        // CActive

#include <e32property.h>    // RProperty

#include "mimalertpropertynotificationobserver.h"

// CLASS DECLARATION

/**

*  Implementation of the Publish & Subscribe property change observer

*

*  @lib MGXMediaFileAPI.lib

*  @since 2.6

*/

NONSHARABLE_CLASS(CIMAlertPropertyObserver) : public CActive

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param aObserver Observer to be informed when observed 

        *                  property changes

        */

        static CIMAlertPropertyObserver* NewL( 

                MIMAlertPropertyNotificationObserver& aObserver );

        /**

        * Destructor.

        */

        virtual ~CIMAlertPropertyObserver();

    public:     // New functions

        /**

        * Starts observing the given key for any changes

        * Notifies the observer when the property changes

        * @since 2.6

        * @param aCategory, Category of the observed property

        * @param aKey, Observed property

        */

        void ObservePropertyChangeL( TUid aCategory, TUint aKey );

        /**

        * Stops observing the key given with call ObserverPropertyChangeL

        */

        void CancelObserve( );

        /**

        * Gets the uid this observer is observing

        * @return the category

        */

        TUid Category();

        /**

        * Gets the uid this observer is observing

        * @return the key

        */

        TUint Key();

    protected:  // Functions from base classes

        /**

        * From CActive

        */

        void RunL();

        /**

        * From CActive

        */

        void DoCancel();

    private:

        /**

        * C++ default constructor.

        */

        CIMAlertPropertyObserver( MIMAlertPropertyNotificationObserver& aObserver );

    private:    // Data

        // Owns: Observed property

        RProperty iProperty;

        // Observer to be informed when property changes

        MIMAlertPropertyNotificationObserver& iObserver;

		// the category this observer is attached to

		TUid iCategory;

		// the key this observer is attached to

		TUint iKey;

    };

#endif      // CIMALERTPROPERTYOBSERVER_H

// End of File