/*

* 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_HNCOMPLEXCONDITION_H

#define C_HNCOMPLEXCONDITION_H

#include <e32base.h>

#include <e32hashtab.h>

#include <xmlengelement.h>

#include "hnconditioninterface.h"

class CLiwGenericParamList;

/**

 * Complex condition.

 * 

 * This class is designed to support complex conditions in the xml configuration.

 *  

 * @lib hnmetadatamodel

 * @since S60 v3.2

 * @ingroup group_hnmetadatamodel

 */

NONSHARABLE_CLASS(CHnComplexCondition) : public CHnConditionInterface

    {

public:

    /**

     * Standard factory function.

     * 

     * @param aElement Xml element.

     * @return Fully constructed object.

     */

    static CHnComplexCondition* NewL( TDesC8 & aElement );

    /**

     * Standard C++ Destructor

     */

    ~CHnComplexCondition();

    /**

     * Returns result.

     *

     * @since S60 v3.2

     * @param aQueryResults Results of query.

     * @param aPos Position in the list.

     * @return True if condition of true, otherwise false.

     */    

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

protected:

    /**

     *  Standard C++ Constructor

     */

    CHnComplexCondition();

    /**

     * Standard symbian second phase constructor.

     * 

     * @param aElement Xml element.

     */

    void ConstructL( TDesC8 & aElement );

    /**

     * Prepares the condition for processng.

     * Removes excessive white characters and 

     * superfluous parentheses

     * 

     * @param aConditionString Condition string.

     */

    TBool CheckForOrOnTheSameLevelL( TDesC8 & aConditionString );

protected: // data

    /**

     * Logical operation between conditions.

     */

    TOperator iOperation;

    /**

     * Own - left side of the condition.

     */

    CHnConditionInterface* iLeftCondition;

    /**

     * Own - right side of the condition.

     */

    CHnConditionInterface* iRightCondition;

    };

#endif // C_HNCOMPLEXCONDITION_H