// 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:

// SQL Literal value and node classes

// 

//

#include "UQ_STD.H"

// internalising literal strings, overload selectors

inline HBufC8* Alloc8L(const TDesC8& aDes)

	{return aDes.AllocL();}

inline HBufC8* Alloc8L(const TDesC16& aDes)

	{HBufC8* cell=HBufC8::NewL(aDes.Length());cell->Des().Copy(aDes);return cell;}

inline HBufC16* Alloc16L(const TDesC16& aDes)

	{return aDes.AllocL();}

inline HBufC16* Alloc16L(const TDesC8& aDes)

	{HBufC16* cell=HBufC16::NewL(aDes.Length());cell->Des().Copy(aDes);return cell;}

template <class B,class T>

inline B* DoInternString(B* aBuf,T*)

	{

	const T* base=aBuf->Ptr();

	const T* from=base;

	const T* end=base+aBuf->Length();

	for (;;)

		{

		if (from==end)

			return aBuf;

		if (*from++=='\'')

			break;

		}

	T* to=(T*)from;

	++from;

	while (from<end)

		{

		T c=*from++;

		if (c=='\'')

			++from;

		*to++=c;

		}

	aBuf->Des().SetLength(to-base);

	return aBuf;

	}

template <class B>

inline B* InternString(B* aBuf)

	{return DoInternString(aBuf,PtrType(*aBuf));}

// Class RSqlLiteral

void RSqlLiteral::Close()

//

// Free any allocated cell

//

	{

	if(iBuffer)

		delete iBuffer;

	if (IsAlloc())

		User::Free(iVal.iAlloc);

	}

void RSqlLiteral::ToInt32L()

//

// Convert a numeric type to Int32

//

	{

	ToInt64L();

	const TInt64& v=iVal.iInt64;

	TInt32 l = I64LOW(v);

	TInt32 h = I64HIGH(v);

	if (h==(l>>31))	// domain check, in signed 32-bit range

		{

		iVal.iInt32=l;

		iType=EInt32;

		}

	else

		__LEAVE(KErrOverflow);	// cannot convert

	}

void RSqlLiteral::ToUint32L()

//

// Convert a numeric type to Uint32

//

	{

	ToInt64L();

	const TInt64& v=iVal.iInt64;

	if (I64HIGH(v)==0)		// domain check, in unsigned 32-bit range

		{

		iVal.iUint32 = I64LOW(v);

		iType=EUint32;

		}

	else

		__LEAVE(KErrOverflow);	// cannot convert

	}

void RSqlLiteral::ToInt64L()

//

// Convert a numeric type to int64

//

	{

	__ASSERT(IsBasic());	// only apply conversions once

	TType t=iType;

	if (t==EReal64)

		{

		iVal.iInt64() = static_cast<TInt64>(Real64());

		iType=EInt64;

		}

	else if (t!=EInt64)

		__LEAVE(KErrGeneral);

	}

void RSqlLiteral::ToReal64L()

//

// Convert a numeric type to real64

//

	{

	__ASSERT(IsBasic());	// only apply conversions once

	TType t=iType;

	if (t==EInt64)

		{

		iVal.iReal64=I64REAL(Int64());

		iType=EReal64;

		}

	else if (t!=EReal64)

		__LEAVE(KErrGeneral);

	}

void RSqlLiteral::ToReal32L()

//

// Convert a numeric type to real32

//

	{

	ToReal64L();

	__LEAVE_IF_ERROR(TRealX(iVal.iReal64).GetTReal(iVal.iReal32));

	iType=EReal32;

	}

void RSqlLiteral::ToTimeL()

//

// Ensure we are a time

//

	{

	__ASSERT(IsBasic());	// only apply conversions once

	if (iType!=ETime)

		__LEAVE(KErrGeneral);	// type mismatch

	}

void RSqlLiteral::ToText8L()

//

// Convert a ptr to a text8

//

	{

	__ASSERT(IsBasic());	// only apply conversions once

	if (iType==EPtr)

		{

		iVal.iAlloc=InternString(Alloc8L(DesC()));

		iType=EBuf8;

		}

	else

		__LEAVE(KErrGeneral);	// type mismatch

	}

void RSqlLiteral::ToText16L()

//

// Convert a ptr to a text8

//

	{

	__ASSERT(IsBasic());	// only apply conversions once

	if (iType==EPtr)

		{

		iVal.iAlloc=InternString(Alloc16L(DesC()));

		iType=EBuf16;

		}

	else

		__LEAVE(KErrGeneral);	// type mismatch

	}

// class CSqlLiteralNode

CSqlLiteralNode::CSqlLiteralNode(TType aType,const TDesC& aColumn,const RSqlLiteral& aLiteral)

	:CSqlBoundNode(aType,aColumn),iLiteral(aLiteral)

	{}

CSqlLiteralNode::~CSqlLiteralNode()

	{

	iLiteral.Close();

	}

void CSqlLiteralNode::BindL(const RDbTableRow& aSource)

	{

	CSqlBoundNode::BindL(aSource);

	switch (ColType())

		{

	default:	// type not allowed in evaluation expressions

		__LEAVE(KErrGeneral);

		break;

	case EDbColBit:

	case EDbColInt8:

	case EDbColUint8:

	case EDbColInt16:

	case EDbColUint16:

	case EDbColInt32:

	case EDbColUint32:

	case EDbColInt64:

		iLiteral.ToInt64L();

		break;

	case EDbColReal32:

	case EDbColReal64:

		iLiteral.ToReal64L();

		break;

	case EDbColDateTime:

		iLiteral.ToTimeL();

		break;

	case EDbColText8:

	case EDbColLongText8:

		iLiteral.ToText8L();

		break;

	case EDbColText16:

	case EDbColLongText16:

		iLiteral.ToText16L();

		break;

		}

	}

// copy text to buffer for LIKE Escape support

TInt RSqlLiteral::CopyText()

	{

	if (iType==EPtr)

		{

		TInt length = iVal.iPtr.iEnd - iVal.iPtr.iPtr;

		if(iBuffer)

			delete iBuffer;

		if((iBuffer=HBufC::New(length+1)) == NULL)

	        	{

			return KErrNoMemory;

			}

		iBuffer->Des().Copy(iVal.iPtr.iPtr,length);

		iVal.iPtr.iPtr= &iBuffer->Des()[0];

		iBuffer->Des().Append(iVal.iPtr.iEnd,1);

		iVal.iPtr.iEnd=&iBuffer->Des()[length]; 

		}

	else

		return KErrGeneral;	// type mismatch

	return KErrNone;

	}