/*

* Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* Definition of the Swi::Sis::CExpression

*

*/

/**

 @file 

 @internalTechnology

*/

#ifndef __SISEXPRESSION_H__

#define __SISEXPRESSION_H__

#include <e32base.h>

#include "sisfield.h"

namespace Swi

{

const static TInt KVariableLanguage = 0x1000;

const static TInt KVariableRemoteInstall = 0x1001;

namespace Sis

 {

class CString;

class CExpression;

class TPtrProvider;

/**

 * This class represents a SisExpression. SisExpression is a basic structure found in  files.

 * It is described in SGL.GT0188.251.

 *

 * @released

 * @internalTechnology

 */

class CExpression : public CField

	{

public:

	/**

	 * This creates a new CExpression object.

	 *

	 * @param aDataProvider 	 An instance of a MSisDataProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 *

	 * @return An instance of CExpression representing the data read.	 	 	 	 	 	 	 	 

	 */

	IMPORT_C static CExpression* NewL(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour = EReadType);

	/**

	 * This creates a new CExpression object and places it on the cleanup stack.

	 *

	 * @param aDataProvider 	 An instance of a MSisDataProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 *

	 * @return An instance of CExpression representing the data read.	 

	 */

	IMPORT_C static CExpression* NewLC(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour = EReadType);

	/**

	 * This creates a new CExpression object in place.

	 *

	 * @param aDataProvider 	 An instance of a TPtrProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 *

	 * @return An instance of CExpression representing the data read.	 

	 */

	IMPORT_C static CExpression* NewL(TPtrProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour = EReadType);

	/**

	 * This creates a new CExpression object in place and places it on the cleanup stack.

	 *

	 * @param aDataProvider 	 An instance of a TPtrProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 *

	 * @return An instance of CExpression representing the data read.	 

	 */

	IMPORT_C static CExpression* NewLC(TPtrProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour = EReadType);

	IMPORT_C virtual ~CExpression();

public: // Accessors

	TOperator Operator() const;

	CExpression* Lhs() const;

	CExpression* Rhs() const;

	TInt32 IntegerValue() const;

	CString* StringValue() const;

private:

	CExpression();

	/**

	 * The second-phase constructor.

	 *

	 * @param aDataProvider		 An instance of a MSisDataProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 */

	void ConstructL(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour);

	/**

	 * The second-phase in-place constructor.

	 *

	 * @param aDataProvider		 An instance of a MSisDataProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 */

	void ConstructL(TPtrProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour);

private:

	TOperator iOperator;

	CExpression* iLeftExpression;

	CExpression* iRightExpression;

	TInt32 iIntegerValue;

	CString* iString;

	};

// inline functions from CExpression

inline TOperator CExpression::Operator() const

	{

	return iOperator;	

	}

inline CExpression* CExpression::Lhs() const

	{

	return iLeftExpression;

	}

inline CExpression* CExpression::Rhs() const

	{

	return iRightExpression;

	}

inline TInt32 CExpression::IntegerValue() const

	{

	return iIntegerValue;

	}

inline CString* CExpression::StringValue() const

	{

	return iString;

	}

 } // namespace Sis

} //namespace Swi

#endif // #ifndef __SISEXPRESSION_H__