/*

* Copyright (c) 2004 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:    LandmarksUi Content File -    Database event listener.

*

*/

#ifndef CLMKDBEVENTLISTENER_H

#define CLMKDBEVENTLISTENER_H

//  INCLUDES

#include "EPos_Landmarks.h"

#include <e32base.h>

// FORWARD DECLARATIONS

class CPosLandmarkDatabase;

class MLmkDbObserver;

// CLASS DECLARATION

/**

*  This class is not meant for direct usage, use CLmkEventListenerSingleton

*  instead.

*  This class is associated to a database since adding the first observer,

*  until removing last observer. It is user's responsibility to remove all

*  added observers.

*/

class CLmkDbEventListener : public CActive

    {

    public:  // Constructors and destructor

        /**

        * Create CLmkDbEventListener object

        * @return newly instantiated object

        */

        static CLmkDbEventListener* NewL();

        /**

        * Destructor.

        */

        ~CLmkDbEventListener();

    public: // New methods

        /**

        * Only one database currently supported, leaves with

        * KErrNotSupported if aDb differs from already used db.

        * @param aObserver

        * @param aDb

        */

        void AddObserverL( MLmkDbObserver& aObserver,

                           CPosLandmarkDatabase& aDb );

        /**

        * Remove observer

        * @param aObserver

        */

        void RemoveObserver( MLmkDbObserver& aObserver );

    protected: // New methods

        /**

        * Start listening

        */

        void StartListening();

    protected: // From CActive

        void RunL();

        void DoCancel();

    protected:  // Constructors and destructor

        /**

        * C++ default constructor.

        * @return newly instantiated object

        */

        CLmkDbEventListener();

        /**

        * Symbian 2nd phase constructor

        */

        void ConstructL();

    private:    // Data

        TPosLmEvent iEvent;

        ///Ref:

        CPosLandmarkDatabase* iDb;

        ///Own:

        HBufC* iDbURI;

        ///Ref:

        RPointerArray<MLmkDbObserver> iObservers;

    };

#endif      // CLMKDBEVENTLISTENER_H

// End of File