/*

* Copyright (c) 2007 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:  Abstract interface for observable classes

*

*  Copyright © 2007 Nokia.  All rights reserved.

*  This material, including documentation and any related computer

*  programs, is protected by copyright controlled by Nokia.  All

*  rights are reserved.  Copying, including reproducing, storing,

*  adapting or translating, any or all of this material requires the

*  prior written consent of Nokia.  This material also contains

*  confidential information which may not be disclosed to others

*  without the prior written consent of Nokia.

*

*

*/

// INCLUDE FILES

#include "Cam.hrh"

#ifndef MCAMOBSERVABLE_H

#define MCAMOBSERVABLE_H

class MCamObserver;

class MCamObservable

    {

public:

    /**

    * Registers an observer if not previously registered

    * @param aObserver The observer concerned

    * @since 3.0

    */

    virtual void RegisterObserverL( MCamObserver* aObserver ) = 0;

    /**

    * Deregisters an observer if previously registered

    * @param aObserver The observer concerned

    * @since 3.0

    */

    virtual void DeregisterObserver( MCamObserver* aObserver ) = 0;

    /**

    * Broadcasts an event code to all registered observers

    * @param aEvent The event code

    */    

    virtual void BroadcastEvent( TCamObserverEvent aEvent ) = 0;            

    };

#endif // MCAMOBSERVABLE_H