/*

* 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:  Header file for CNSmlDMDbNotifier

*

*/

#ifndef NSMLDMDBNOTIFIER_H

#define NSMLDMDBNOTIFIER_H

#include <e32std.h>

#include <SyncMLObservers.h>

#include <SyncMLClient.h>

#include "NSmlDMSyncUtil.h"

// CLASS DECLARATION

/**

* DB events

* 

*/

NONSHARABLE_CLASS (TNSmlDMDbEvent)

	{

	public:

		TInt iType;	

		TInt iProfileId;

		TInt iError;

	};

/**

* Interface class to handle database events

* 

*/

class MNSmlDMDbEventHandler

	{

	public:

		/**

        * CNSmlDMDbNotifier calls this to inform that database has changed.

        * @param aStatus EClose, EUnlock, ECommit, ERollback, or ERecover (d32dbms.h).

		* @param aMoreEvents ETrue issue new request, EFalse no requests.

        * @return None. 

        */

		virtual void HandleDbEventL( TNSmlDMDbEvent aEvent ) = 0;

	};

/**

* DB notifier

* 

*/

NONSHARABLE_CLASS (CNSmlDMDbNotifier) : public CBase,

                                        public MNSmlDMActiveCallerObserver,

                                        public MSyncMLEventObserver

	{	

    public:

	    enum TEventType

			{

			EUpdate,

			EUpdateAll,

			EDelete,

	        EClose

			};

	public:

		/**

        * Two-phased constructor

        * @param aDatabase Reference to RDbDatabase instance.

		* @param aHandler Pointer to MNSmlDMDbEventHandler instance.

        * @return None. 

        */

		static CNSmlDMDbNotifier* NewL( RSyncMLSession* aSyncSession,

		                                MNSmlDMDbEventHandler* aHandler );

        /**

        * Destructor.

        */

		virtual ~CNSmlDMDbNotifier();

		// Functions from base classes

	private:

		/**

        * Constructor

        * @param aDatabase Reference to RDbDatabase instance.

		* @param aHandler Pointer to event handler.

        * @return None. 

        */

		CNSmlDMDbNotifier( RSyncMLSession* aSyncSession,

		                   MNSmlDMDbEventHandler* aHandler);

        /**

        * By default Symbian OS constructor is private.

        */

		void ConstructL();

	public:

		/**

		* Start requesting events from db.

        * @param None. 

        * @return None. 

        */

		void RequestL();

	private:   // from MNSmlDMActiveCallerObserver

		/**

        * From MNSmlDMActiveCallerObserver

		* Called when CNSmlDMActiveCaller completes.

        * @param None

        * @return None.

        */

		void HandleActiveCallL();

    private:    // from MSyncMLEventObserver

		/**

        * From MSyncMLEventObserver

		* Called when SyncML session events oocur.

        * @param aEvent.

        * @param aIdentifier.

        * @param aError.

        * @param aAdditionalData.

        * @return None.

        */

        void OnSyncMLSessionEvent( TEvent aEvent,

                                   TInt aIdentifier,

                                   TInt aError,

                                   TInt aAdditionalData);

    public:

		/**

		* Call observer with delay

		* @param None

		* @return None

        */

		void CallObserverWithDelay();

		/**

		* Call observer

		* @param None

		* @return None

        */		

		void CallObserver();

		/**

		* Set as disabled

		* @param aDisable

		* @return None

        */		

		void SetDisabled( TBool aDisable );

		/**

		* Change profile count

		* @param None

		* @return TInt

        */		

		TInt ChangedProfileCount();

		/**

		* DB event

		* @param aIndex

		* @return db event

        */        

        TNSmlDMDbEvent Event(TInt aIndex);

		/**

		* Event count

		* @param None

		* @return TInt

        */		

		TInt EventCount();

		/**

		* Reset

		* @param None

		* @return None

        */		

		void Reset();

		/**

		* Find event

		* @param None

		* @return TInt

        */

		TInt FindCloseEvent();

		/**

		* Find event

		* @param None

		* @return TInt

        */

		TInt FindSingleProfileEvent();

		/**

		* Find event

		* @param None

		* @return TInt

        */

		TInt FindProfileEvent();

		/**

		* Check if profile id is unique

		* @param aId Profile id

		* @return ETrue if unique

        */

		TBool IsUniqueProfileId(TInt aId);

		/**

		* Utility function.

		* @return Sync session.

        */

		RSyncMLSession& Session();

	private:  

		// sync session

		RSyncMLSession* iSyncSession;

		// Pointer to event handler

		MNSmlDMDbEventHandler* iHandler;

		// for making function call via active scheduler

		CNSmlDMActiveCaller* iActiveCaller;

		// for storing ids of changed profiles

		RArray<TNSmlDMDbEvent> iList;

		// can observer be called

		TBool iDisabled;

		// is synchronizing going on

		TBool iSyncRunning;

	};

#endif // NSMLDMDBNOTIFIER_H

// End of File