1 // Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #ifndef __LOGFILTQ__

    17 #define __LOGFILTQ__

    18 

    19 #include <badesca.h>

    20 #include <logwrap.h>

    21 #include "LogDynBuf.h"

    22 #include "LogCliServShared.h"

    23 

    24 // Classes referenced

    25 class CLogFilter;

    26 class CLogFilterList;

    27 class MLogServDatabaseTransactionInterface;

    28 

    29 /**

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

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

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

    33 

    34 @see CLogFilterList

    35 @see RLogDynBuf

    36 @see MLogServDatabaseTransactionInterface

    37 @internalComponent

    38 */

    39 class TLogFilterExprBuilder

    40 	{

    41 public:

    42     TLogFilterExprBuilder(MLogServDatabaseTransactionInterface& aDatabase);

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

    44                      TLogFilterConstructionType aType = ELogFilterConstructFilterByFilterFieldByField);

    45 	

    46 private:

    47 	void DoNextProcessFilterByFilterFieldByFieldL(RLogDynBuf& aExpr);

    48 	void DoNextProcessFieldByFieldFilterByFilterL(RLogDynBuf& aExpr);

    49 	void MakePredicatesL();

    50 	void MakeConditionL(RLogDynBuf& aExpr);

    51 	void MakeFlagPredicatesL();

    52 	const TDesC& ColumnName() const;

    53     void MakeNullPredicate(TDes& aDes);

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

    55     TBool IsDuplicateNullField() const;

    56 	TBool IsDuplicateField(const CLogFilter& aFilter) const;

    57 	TBool IsFieldEmpty(const CLogFilter& aFilter) const;

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

    59 	void Invariant() const;

    60 

    61 private:

    62 	MLogServDatabaseTransactionInterface& iDatabase;

    63     const CLogFilterList* iFilterList;

    64     const TDesC* iInitial;

    65     TLogFilterConstructionType iConstructionType;

    66 	TInt iFilterIndex;

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

    68 					//See CLogServRecentCondition::ConstructL() implementation. 

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

    70 					//ELogContactField...ELogSimIdField. 

    71 	TInt iFlagIndex;

    72     CDesCArrayFlat* iPredicateList;

    73 	};

    74 

    75 #endif