/*

* Copyright (c) 2009 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 DATAOBSERVER_H

#define DATAOBSERVER_H

#include <e32base.h>

class MHsDataObserver {

public:

    virtual void DataChanged() =0;

};

class CHsDataObserver: public CBase,

                       public MHsDataObserver

{

public:

    virtual void Cancel(const RMessage2& reason) =0;

};

class MHsDataObserverStorage

{

public:

    virtual void PushL(CHsDataObserver*) =0;

    virtual void Pop(CHsDataObserver*) =0;

    virtual void Cancel(const RMessage2& reason) =0;

};

#endif //DATAOBSERVER_H