// Copyright (c) 2006-2010 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 __SQLBUFITERATOR_H__

#define __SQLBUFITERATOR_H__

#include <sqldb.h>			//TSqlColumnType

#include "SqlBufFlat.h"		//RSqlBufFlat

#include "SqlAssert.h"	

//Forward declarations

class MStreamBuf;

/**

ZeroBlob column type. Used internally.

@internalComponent

*/

enum {ESqlZeroBlob = ESqlBinary + 1};

inline TBool IsSequenceSqlType(TInt aType)

	{

	return aType == ESqlNull || aType == ESqlText || aType == ESqlBinary;

	}

//////////////////////////////////////////////////////////////////////////////////////

/////////////////////  Column type conversion table  /////////////////////////////////

//////////////////////////////////////////////////////////////////////////////////////

//|--------------------------------------------------------------------------------|//

//|Column type | ColumnInt() ColumnInt64() ColumnReal() ColumnText() ColumnBinary()|//

//|--------------------------------------------------------------------------------|//

//|Null........|.0...........0.............0.0..........KNullDesC....KNullDesC8....|//

//|Int.........|.Int.........Int64.........Real.........KNullDesC....KNullDesC8....|//

//|Int64.......|.clamp.......Int64.........Real.........KNullDesC....KNullDesC8....|//

//|Real........|.round.......round.........Real.........KNullDesC....KNullDesC8....|//

//|Text........|.0...........0.............0.0..........Text.........KNullDesC8....|//   

//|Binary......|.0...........0.............0.0..........KNullDesC....Binary........|//

//|--------------------------------------------------------------------------------|//

//- "clamp": return KMinTInt or KMaxTInt if the value is outside the range that can //

//  be represented by the type returned by the accessor function.                   //

//- "round": the floating point value will be rounded up to the nearest integer.    //

//  If the result is outside the range that can be represented by the type returned //

//  by the accessor function, then it will be clamped.                              //

//////////////////////////////////////////////////////////////////////////////////////

/**

TSqlBufRIterator iterator gives read-only access to the flat buffer content (RSqlBufFlat class).

For convenience TSqlBufRIterator can represent the flat buffer fields content as one of the basic

SQL types: TInt, TInt64, TReal, 16-bit text, 8-bit binary block.

The text and binary fields may be accessed also as a byte stream.

@see RSqlBufFlat

@internalComponent

*/

class TSqlBufRIterator

	{

public:	

	inline void Set(const RSqlBufFlat& aBuf);

	inline TBool Next();

	inline void MoveTo(TInt aIndex);

	inline TBool IsPresent() const;

	inline TInt Type() const;

	inline TInt Size() const;

	TInt Int() const;

	TInt64 Int64() const;

	TReal Real() const;

	TPtrC8 Binary() const;

	TPtrC16 Text() const;

	MStreamBuf* StreamL() const;

private:

	inline TInt AsInt() const;

	inline TInt64 AsInt64() const;

	inline TReal AsReal() const;

private:

	const RSqlBufFlat::TCell*	iCurrent;

	const RSqlBufFlat::TCell*	iBegin;

	const RSqlBufFlat::TCell*	iEnd;

	};

/**

TSqlBufWIterator iterator gives write-only access to the flat buffer content (RSqlBufFlat class).

For convenience, with TSqlBufWIterator flat buffer fields can be set as:

TInt, TInt64, TReal, 16-bit text, 8-bit binary block.

@see RSqlBufFlat

@internalComponent

*/

class TSqlBufWIterator

	{

public:

	inline void Set(RSqlBufFlat& aBuf);

	inline TBool Next();

	inline void MoveTo(TInt aIndex);

	inline void SetNull();

	inline void SetAsNotPresent(TInt aType, TInt aLength);

	inline TInt SetInt(TInt aValue);

	inline TInt SetInt64(TInt64 aValue);

	inline TInt SetReal(TReal aValue);

	inline TInt SetBinary(const TDesC8& aValue);

	inline TInt SetText(const TDesC16& aValue);

	inline TInt SetZeroBlob(TInt aSize);

private:

	RSqlBufFlat*	iBuf;

	TInt			iIndex;

	};

#include "SqlBufIterator.inl"

#endif //__SQLBUFITERATOR_H__