// Copyright (c) 2002-2009 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 __LOGFILTQ__

#define __LOGFILTQ__

#include <badesca.h>

#include <logwrap.h>

#include "LogDynBuf.h"

#include "LogCliServShared.h"

// Classes referenced

class CLogFilter;

class CLogFilterList;

class MLogServDatabaseTransactionInterface;

/**

This class provides only one public method (apart from constructor) - BuildExprLC().

BuildExprLC() accepts as an input parameter a list with view filters and constructs from them

a "WHERE" SQL expression that is returned to the caller into the RLogDynBuf output parameter. 

@see CLogFilterList

@see RLogDynBuf

@see MLogServDatabaseTransactionInterface

@internalComponent

*/

class TLogFilterExprBuilder

	{

public:

    TLogFilterExprBuilder(MLogServDatabaseTransactionInterface& aDatabase);

	void BuildExprLC(RLogDynBuf& aExpr, const CLogFilterList& aFilterList, const TDesC& aInitial, 

                     TLogFilterConstructionType aType = ELogFilterConstructFilterByFilterFieldByField);

private:

	void DoNextProcessFilterByFilterFieldByFieldL(RLogDynBuf& aExpr);

	void DoNextProcessFieldByFieldFilterByFilterL(RLogDynBuf& aExpr);

	void MakePredicatesL();

	void MakeConditionL(RLogDynBuf& aExpr);

	void MakeFlagPredicatesL();

	const TDesC& ColumnName() const;

    void MakeNullPredicate(TDes& aDes);

	void MakePredicateL(TDes& aDes, const CLogFilter& aFilter);

    TBool IsDuplicateNullField() const;

	TBool IsDuplicateField(const CLogFilter& aFilter) const;

	TBool IsFieldEmpty(const CLogFilter& aFilter) const;

	TBool IsDuplicate(const CLogFilter& aFilter1, const CLogFilter& aFilter2) const;

	void Invariant() const;

private:

	MLogServDatabaseTransactionInterface& iDatabase;

    const CLogFilterList* iFilterList;

    const TDesC* iInitial;

    TLogFilterConstructionType iConstructionType;

	TInt iFilterIndex;

	TUint16 iField; //It must be 16-bit. The iField value is read from a resource file. 

					//See CLogServRecentCondition::ConstructL() implementation. 

					//The iField type width then restricts the max number of field macro values - 

					//ELogContactField...ELogSimIdField. 

	TInt iFlagIndex;

    CDesCArrayFlat* iPredicateList;

	};

#endif