/*

* Copyright (c) 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:  DS notepad datastore.

*

*/

#ifndef __NSMLNOTEPADMODSFETCHER_H__

#define __NSMLNOTEPADMODSFETCHER_H__

//Forward declaraations

class CNSmlChangeFinder;

class CNSmlNotepadDatabase;

class TNSmlSnapshotItem;

// CONSTANTS

const TInt KNSmlSnapshotSize = 56;

const TInt KNSmlSnapshotSmallSize = 8;

const TInt KNSmlSnapshotItemCount = 20;

// CLASS DECLARATION

// ------------------------------------------------------------------------------------------------

// CNSmlnotepadModsFetcher

//

// @lib nsmlnotepaddataprovider.lib

// ------------------------------------------------------------------------------------------------

class CNSmlNotepadModsFetcher : public CActive

	{

	public:

		/**

		* two phase constructor

		* @param		aSnapshotRegistered	Is snapshot registered.

		* @param		aCntDb				Pointer to opened database.

		* @param		aKey				Key array.

		* @param		aChangeFinder		Pointer to Changefinder.

		*/

		static CNSmlNotepadModsFetcher* NewL(TBool& aSnapshotRegistered, 

											CNSmlNotepadDatabase* aNpdDb, 

											TKeyArrayFix& aKey, 

											CNSmlChangeFinder& aChangeFinder );

		/**

		* two phase constructor

		* @param		aSnapshotRegistered	Is snapshot registered.

		* @param		aCntDb				Pointer to opened database.

		* @param		aKey				Key array.

		* @param		aChangeFinder		Pointer to Changefinder.

		*/

		static CNSmlNotepadModsFetcher* NewLC(TBool& aSnapshotRegistered, 

												CNSmlNotepadDatabase* aNpdDb, 

												TKeyArrayFix& aKey, 

												CNSmlChangeFinder& aChangeFinder );

		/**

		* C++ constructor.

		* @param		aSnapshotRegistered	Is snapshot registered.

		* @param		aCntDb				Pointer to opened database.

		* @param		aKey				Key array.

		* @param		aChangeFinder		Pointer to Changefinder.

		*/

		/**

		* ~CCNSmlNotepadModsFetcher() desctructor.

		*/

		virtual ~CNSmlNotepadModsFetcher();

	private:		

		CNSmlNotepadModsFetcher( TBool& aSnapshotRegistered, 

									CNSmlNotepadDatabase* aNpdDb, 

									TKeyArrayFix& aKey, 

									CNSmlChangeFinder& aChangeFinder );

		/**

		* Second phase constructor.

		*/

		void ConstructL();

	public:	

		/**

		* Reads all modifications from clients notepad databse.

		* @param		aStatus				On completion of the operation, contains the result code.

		*/

		TInt FetchModificationsL( TRequestStatus& aStatus );

		/**

		* Reset the flag to avoid duplication of snapshotitem.

		*/

		void Reset();

	private:

		/**

		* Fetches next chunk of data (client notepad data changes).

		*/

		void FetchNextChunkL();

		/**

		* From CActive. Called when asynchronous operation completes.

		*/

		void RunL();  

		/**

		* From CActive. Cancels operation.

		*/

		void DoCancel();

	private: // data

		TRequestStatus* iCallerStatus;

		TBool iBeginning;

		TBool iEnd;

		CArrayFixSeg<TNSmlSnapshotItem>* iSnapshot;

		TBool& iSnapshotRegistered;

		CNSmlNotepadDatabase* iNpdDb;

		TKeyArrayFix& iKey;

		CNSmlChangeFinder& iChangeFinder;

		TInt iCurrentSnapshotCounter;

	};

#endif // __NSMLNOTEPADMODSFETCHER_H__

// End of File