// Copyright (c) 1998-2009 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:

//

#include "UT_STD.H"

// Class HDbColumnMap

class HDbColumnMap

	{

public:

	static HDbColumnMap* NewL(const RSqlColumnList& aSelect,const HDbColumnSet& aColumns);

	inline const TDbColNo& operator[](TDbColNo aCol) const

		{__ASSERT(aCol>0&&aCol<=iCount);return iMap[aCol-1];}

	inline TInt Count() const

		{return iCount;}

private:

	TInt iCount;

	TDbColNo iMap[1];	// at least one

	};

HDbColumnMap* HDbColumnMap::NewL(const RSqlColumnList& aSelect,const HDbColumnSet& aColumns)

	{

	TInt count=aSelect.Count();

	HDbColumnMap* self=(HDbColumnMap*)User::AllocLC(_FOFF(HDbColumnMap,iMap[count]));

	self->iCount=count;

	TDbColNo* pCol=&self->iMap[0];

	for (TInt ii=0;ii<count;++ii)

		{

		TDbColNo col=aColumns.ColNoL(aSelect[ii]);

		if (col==KDbNullColNo)

			__LEAVE(KErrNotFound);

		*pCol++=col;

		}

	CleanupStack::Pop();

	return self;

	}

// Class CDbProjectStage

CDbProjectStage::CDbProjectStage()

	{}

CDbProjectStage::~CDbProjectStage()

	{

	delete iMap;

	}

void CDbProjectStage::ConstructL(const RSqlColumnList& aSelect,const HDbColumnSet& aColumns)

//

// Build the column map and allocate a row buffer

//

	{

	iMap=HDbColumnMap::NewL(aSelect,aColumns);

	}

RDbRow* CDbProjectStage::RowBuffer()

//

// whole-row access cannot be done through a projection

//

	{

	return 0;

	}

TDbColumn CDbProjectStage::Column(TDbColNo aColNo)

	{

	return CDbDataStage::Column((*iMap)[aColNo]);

	}

TInt CDbProjectStage::ColumnCount() const

	{

	return iMap->Count();

	}

const TDbColumnDef& CDbProjectStage::ColumnDef(TDbColNo aCol) const

	{

	return CDbDataStage::ColumnDef((*iMap)[aCol]);

	}