// 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