/*

* Copyright (c) 2005 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:  GS engine interface.

*

*/

#ifndef GS_ENGINE_INTERFACE_H

#define GS_ENGINE_INTERFACE_H

// INCLUDES

#include <e32base.h>

/**

* Interface to GS engine. Provides functions for creating, deleting, getting 

* and setting settings data. Supported data types are Tint, Treal, TDesC8 and 

* TDesC16.

*/

class MGSEngine

    {

public:

    virtual void MGSEngine() = 0;

    /**

    * Adds an observer. Does not take the ownership of the observer. The 

    * observer will get notification whenever the observed data is changed.

    */

    virtual void AddObserverL(MGSEngineObserver* aObserver, TUnt32 aObservedId) = 0;

    /**

    * Removes an observer.

    */

    virtual void RemoveObserver(MGSEngineObserver* aObserver) = 0;

    virtual TInt Create(TUint32 aId, TInt aVal) = 0;

	virtual TInt Create(TUint32 aId, const TReal& aVal) = 0;

	virtual TInt Create(TUint32 aId, const TDesC8& aVal) = 0;

	virtual TInt Create(TUint32 aId, const TDesC16& aVal) = 0;

	virtual TInt Delete(TUint32 aId) = 0;

    virtual TInt Get(TUint32 aId, TInt& aVal) = 0;

	virtual TInt Set(TUint32 aId, TInt aVal) = 0;

	virtual TInt Get(TUint32 aId, TReal& aVal) = 0;

	virtual TInt Set(TUint32 aId, const TReal& aVal) = 0;

	virtual TInt Get(TUint32 aId, TDes8& aVal) = 0;

	virtual TInt Set(TUint32 aId, const TDesC8& aVal) = 0;

	virtual TInt Get(TUint32 aId, TDes16& aVal) = 0;

	virtual TInt Set(TUint32 aId, const TDesC16& aVal) = 0;

    };

/**

* Observer for GS engine. 

*/

class MGSEngineObserver

    {

    virtual void ValueChanged(TUint32 aId) = 0;

    };

#endif //GS_ENGINE_INTERFACE_H

// End of File