// Copyright (c) 2001-2009 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:

//

#ifndef __CMSVCACHEDSTORE_H__

#define __CMSVCACHEDSTORE_H__

#include <e32base.h>

#include <f32file.h>

#include <s32mem.h>

class CMsvStore;

class RFileWriteStream;

#include "MSVSTD.H"

class MMsvStoreManager;

/**

The TPairedTUidHBufC8  class

 Implementes a uid/HBufC8 pair, with functions to load/save them to/from a file

*/

class TPairedTUidHBufC8

/**

@internalComponent

@released

*/

	{

public:

	TPairedTUidHBufC8();

	TUid	iUid;

	HBufC8 *iBuf;

	void ExternalizeL(RWriteStream& aStream) const;

	void InternalizeL(RReadStream& aStream);

	};

/**

The CMsvCachedStore  class

 Implementes a set of uid/HBufC8 pairs, and persists them to a file

 Replaces a Dictionary Store in the message server. The difference

 being that this class keeps all the pairs in memory.

*/

class CMsvCachedStore : public CBase

/**

@internalComponent

@released

*/

	{

public:

	static CMsvCachedStore* OpenL(TMsvId aId, MMsvStoreManager& aStoreManager, TBool aReadOnly);

#if (defined SYMBIAN_MESSAGESTORE_HEADER_BODY_USING_SQLDB)

	static CMsvCachedStore* OpenL(TMsvId aId, MMsvStoreManager& aStoreManager, TBool aReadOnly,TUid aMtmId);

	void AssignL(CHeaderFields* aHeaderFields);

	void GetHeaderL(TUid aUid, CHeaderFields*& aHeaderFields);

	void LoadHeaderEntryL(const TUid aMtmId,TBool aReadOnly);

#endif	

	TInt Size() const;

	void DeleteL();

	TBool IsNullL() const;

	TBool IsPresentL(TUid aUid) const;

	void Remove(TUid aUid);

	void RemoveL(TUid aUid);

	void Revert();

	void RevertL();

	TInt Commit(); 

	void CommitL();

	~CMsvCachedStore();

private:

	HBufC8* GetStreamL(TUid aUid) const;

	void CreateOrReplaceStreamL(TUid aUid, CBufBase &aBuf);

	TInt FindStream(TUid aUid,TInt &pos) const;

	TInt DeleteStream(TUid aUid);

	CMsvCachedStore(TMsvId aId, MMsvStoreManager& aStoreManager);

	void CleanArray();

	static HBufC8* FlattenLC(CBufBase &aBuf);

	void ConstructL(TBool aReadOnly);

#if (defined SYMBIAN_MESSAGESTORE_HEADER_BODY_USING_SQLDB)

	void ConstructDBL(TBool aReadOnly,TUid aMtmId);

#endif

	void LoadL(RFile &aFile);

	void SaveL();

	void WriteToFileStreamL(RFileWriteStream &aOut);

#if (defined SYMBIAN_MESSAGESTORE_HEADER_BODY_USING_SQLDB)	

public:

	TUid iMtmId;

	RPointerArray<CHeaderFields> iHeaderFieldList;

	TBool isBodyPartDeleted;

	TBool isNewEntry;

	TBool isDbStore;

#endif		

private:

	CArrayFix<TPairedTUidHBufC8> *iStreams;

	TInt   iReaderCount;

	TInt   iWriterCount;

	const TMsvId iEntryId;

	MMsvStoreManager& iStoreManager;

	TInt iSize;

//

#if (defined SYMBIAN_MESSAGESTORE_HEADER_BODY_USING_SQLDB)

friend class CMsvStore;

#endif

friend class RMsvReadStream;

friend class RMsvWriteStream;

friend class HMsvReadBuf;

friend class HMsvWriteBuf;

};

#endif