/*

* Copyright (c) 2006-2006 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* 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:

*

*

*/

#ifndef CBSBACKUPOBSERVER_H

#define CBSBACKUPOBSERVER_H

#include <e32base.h>

#include <e32property.h>

#include "mbsbackupobserver.h"

/**

 *  Gets and notifies backup and Restore events from system

 *

 *  @lib bsserver.exe

 *  @since S60 v3.2

 */

class CBSBackupObserver : public CActive

{

public:

    static CBSBackupObserver* NewL();

    static CBSBackupObserver* NewLC();

    ~CBSBackupObserver();

private: // From CActive

    /**

     * @see CActive

     */

    void RunL();

    /**

     * @see CActive

     */

    void DoCancel();

    /**

     * @see CActive

     */

    TInt RunError( TInt aError );

private: // Private constructors

    CBSBackupObserver();

    void ConstructL();

public: // New Methods

    /**

     * Register observer to observe backup state changes

     * @param aObserver observer to register

     * @return KErrNone or some other system wide errorcode

     */

    TInt RegisterObserver( MBSBackupObserver* aObserver );

    /**

     * Unregister observer

     * @param aObserver observer to remove

     */

    void UnregisterObserver( MBSBackupObserver* aObserver );   

private: // New methods

    /**

     * Subscribes to backup and restore P&S value.

     */

    void Subscribe();

    /**

     * Notify registered observers of new backup state

     */

    void NotifyObserversL( MBSBackupObserver::TBackupState aState );

    /**

     * Read current backup state

     * @return current backup state

     */

    MBSBackupObserver::TBackupState BackupStateL();

private: // Data

    // backup state property

    RProperty iProperty;

    // Own (array only). Observers

    RPointerArray<MBSBackupObserver> iObservers;

    // latest state of backup and restore;

    MBSBackupObserver::TBackupState iLatestState;

};

#endif //CBSBACKUPOBSERVER_H