/*

* Copyright (c) 2006-2009 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 "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: 

* Cluster class for FileSystem component

* @internalComponent

* @released

*

*/

#ifndef CLUSTER_H

#define CLUSTER_H

#include "errorhandler.h"

#include "directory.h"

typedef std::multimap <unsigned int,unsigned int> TClustersPerEntryMap;

/*

 * This class is used by classes CDirRegion and CLongName. This class describes 

 * the basic Data members and Member functions related to cluster number 

 * allocation and FAT input map creation.

 *

 * @internalComponent

 * @released

 */

class CCluster

{

	public:

		static CCluster* Instance (unsigned int aClusterSize, 

								   unsigned int aTotalNumberOfClusters);

		unsigned int GetCurrentClusterNumber() const;

		void DecrementCurrentClusterNumber();

		unsigned short int GetHighWordClusterNumber() const;

		unsigned short int GetLowWordClusterNumber() const;

		void CreateMap(unsigned int aStartingClusterNumber,unsigned int aPairClusterNumber);

		TClustersPerEntryMap* GetClustersPerEntryMap();

		void UpdateNextAvailableClusterNumber();

		unsigned int GetClusterSize() const;

		~CCluster ();

	private:

		CCluster(unsigned int aClusterSize,

				 unsigned int aTotalNumberOfClusters);

		static CCluster* iClusterInstance;

		unsigned long int iClusterSize;

		unsigned int iRootClusterNumber;

		unsigned int iCurrentClusterNumber;

		unsigned int iTotalNumberOfClusters;

		/* used to store the mapping of Starting cluster and Number's of

		 * clusters occupied by the specific entry

		 */

		TClustersPerEntryMap iClustersPerEntry;

};

#endif //CLUSTER_H