/*

* Copyright (c) 2007-2008 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 C_HNSIMPLECONDITION_H

#define C_HNSIMPLECONDITION_H

#include <e32base.h>

#include <e32hashtab.h>

#include <xmlengelement.h> 

#include <liwgenericparam.h>

#include "hnglobals.h"

#include "hnconditioninterface.h"

class CLiwGenericParamList;

class TLiwVariant;

/**

 * Simple Condition.

 * 

 * The simple condition class. This is the base class for different

 * condition classes, e.g. Greater, Has, HasNot conditions.

 *  

 * @lib hierarchynavigatorengine

 * @since S60 v3.2

 * @ingroup group_hnmetadatamodel

 */

NONSHARABLE_CLASS(CHnSimpleCondition) : public CHnConditionInterface

    {

public:

    /**

     * Standard factory function.

     * 

     * @param aElement Xml element.

     * @return Fully constructed object.

     */

    static CHnSimpleCondition* NewL( TDesC8 & aElement );

    /**

     * Standard C++ Destructor

     */

    ~CHnSimpleCondition();

    /**

     * Removes quotes.

     *

     * @since S60 v3.2

     * @param aValue String to remove quotes from.

     */

    static void RemoveQuotes( RBuf8 & aValue );

    /**

     * Returns result.

     *

     * @since S60 v3.2

     * @param aQueryResults Results of query.

     * @param aPos Position.

     * @return True if condition is satisfied.

     */    

    TBool ResultL( const CLiwGenericParamList& aQueryResults, TInt aPos );

    /**

     * Returns result.

     *

     * @since S60 v3.2

     * @param aVarLeft Left variant.

     * @param aVarRight Right variant.

     * @return True if condition is satisfied.

     */    

    virtual TBool CheckCondition( TLiwVariant& aVarLeft, TLiwVariant& aVarRight ) = 0;

protected:

    /**

     *  Standard C++ Constructor

     */

    CHnSimpleCondition();

    /**

     * Standard symbian second phase constructor.

     * 

     * @param aElement Xml element.

     */

    void ConstructL( TDesC8 & aElement );

    /**

     * Gets positions.

     * 

     * @param aBuffer Buffer.

     * @return Position.

     */

    virtual TInt GetPositionL( const TDesC8& aBuffer ) = 0;

    /**

     * Gets length.

     * 

     * @return Length of an operator.

     */

    virtual TInt SignLength() = 0;

private:

    /**

     * Checks if both combinations, if either of the pairs, has this 

     * sort of type configuration.

     *

     * @since S60 v3.2

     * @param aVarLeft Left variant.

     * @param aVarRight Right variant.

     * @param aType1 Variant type 1.

     * @param aType2 Variant type 2.

     */

    static TLiwVariant* CheckTypes( TLiwVariant* aVarLeft, TLiwVariant* aVarRight, 

            LIW::TVariantTypeId aType1, LIW::TVariantTypeId aType2 );

    /**

     * Normalizes to one sort of descriptor type.

     *

     * @since S60 v3.2

     * @param aVar Variant.

     */

    static void NormalizeVariantTypeDesL( TLiwVariant* aVar );

    /**

     * Tries to match types of content.

     *

     * @since S60 v3.2

     * @param aVarLeft Left variant.

     * @param aVarRight Right variant.

     */    

    static void NegotiateTypesL( TLiwVariant* aVarLeft, TLiwVariant* aVarRight );

    /**

     * If list is compared to a string, a decision is made, to substitute list a

     * its Count() scalar.

     *

     * @since S60 v3.2

     * @param aVar Variant.

     */    

    static void NegotiateListL( TLiwVariant & aVar );

    /**

     * If map is compared to a string, a decision is made, to substitute list a

     * its Count() scalar.

     *

     * @since S60 v3.2

     * @param aVar Variant.

     */    

    static void NegotiateMapL( TLiwVariant & aVar );

    /**

     * If tuint is compared to a string, a decision is made, to substitute 

     * it as tuint

     *

     * @since S60 v3.2

     * @param aVar Variant.

     */    

    static void NegotiateTUintL( TLiwVariant & aVar );

    /**

     * 

     * @since S60 v3.2

     * @param aVar Variant.

     */

    static void NegotiateTBoolL( TLiwVariant & aVar );

    /**

     * If tuint is compared to a string, a decision is made, to substitute 

     * it as tin32

     *

     * @since S60 v3.2

     * @param aVar Variant.

     */  

    static void NegotiateTInt32L( TLiwVariant & aVar );

    /**

     * If tuint is compared to a string, a decision is made, to substitute 

     * it as tin32

     *

     * @since S60 v3.2

     * @param aVar Variant.

     */  

    static void NegotiateTInt64L( TLiwVariant & aVar );

    /**

     * Creates implementation of CHnMenuCondition.

     * 

     * @param aElement Xml element.

     * @return Instance of CHnMenuCondition.

     */

    static CHnSimpleCondition* CreateImplementationL( TDesC8 & aElement );

protected: // data

    /**

     * Own - Key.

     */

    RBuf8 iReferenceRight;

    /**

     * Own - Key.

     */

    RBuf8 iReferenceLeft;

    };

#endif // C_HNSIMPLECONDITION_H

//End of file