/*

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

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*       Class for registering CPbkContactEngine observers.

*

*/

#ifndef __CPbkContactChangeNotifier_H__

#define __CPbkContactChangeNotifier_H__

//  INCLUDES

#include <e32base.h>  // CBase

// FORWARD DECLARATIONS

class CPbkContactEngine;

class MPbkContactDbObserver;

// CLASS DECLARATION

/**

 * A class used for registering as an observer for contact database

 * change events. 

 */

class CPbkContactChangeNotifier : public CBase

    {

    public:  // Constructors and destructor

        /**

         * Creates a new instance of this class and registers aObserver as an

         * observer of aEngine.

         *

         * @param aEngine   The observed object.

         * @param aObserver The observer to call when database changes occur.

         * @return  A contact change notifier instance.

         */

        IMPORT_C static CPbkContactChangeNotifier* NewL

            (CPbkContactEngine& aEngine, MPbkContactDbObserver* aObserver);

        /**

         * Removes the aObserver from aEngine given as paramters to NewL and

         * destructs this object.

         */

        ~CPbkContactChangeNotifier();

    private:  // Implementation

        CPbkContactChangeNotifier

            (MPbkContactDbObserver* aObserver);

        void ConstructL(CPbkContactEngine& aEngine);

    private:  // data

        /// Ref: Phonebook engine

        CPbkContactEngine* iEngine;

        /// Ref: the observer

        MPbkContactDbObserver* iObserver;

    };

#endif // __CPbkContactChangeNotifier_H__

// End of File