/*

* Copyright (c) 2008-2009 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:  Observes Backup & Restore's state key and status -*

*/

#ifndef CTBACKUPSUBSCRIBER_H

#define CTBACKUPSUBSCRIBER_H

// SYSTEM INCLUDE

#include <e32base.h>

#include <e32cmn.h>

// USER INCLUDE

#include "mpropertyobserver.h"

// FORWARD CLASS DECLERATION

class CPropertyWatcher;

/**

 * Observer interface for Backup & Restore changes.

 */

 class MBackupRestoreObserver

     {

     public:

         /**

          * Called by CBlacklistBackupSubscriberAO when

          * Backup&Restore is backing up or restoring.

          */

         virtual void BackupRestoreStart() = 0;

         /**

          * Called by CBlacklistBackupSubscriberAO when

          * Backup&Restore has finished backup or restore.

          */

         virtual void BackupRestoreReady() = 0;

     };

/**

* This class implements object for watching

* Backup & Restore is state. 

*/

 NONSHARABLE_CLASS( CBackupSubscriber ) : public CBase, public MKeyAndStatusObserver

  	{

public:

    /**

     * Creates and constructs a new instance of CBackupSubscriber.

     *

     * @return A pointer to the new instance.

     */

    static CBackupSubscriber* NewL( MBackupRestoreObserver& aObserver );

    /**

     * Destructor.

     */

    virtual ~CBackupSubscriber();

public:

   /*

    @function NotifyKeyAndStatusL - get called when propertys value has changed.

    @param aKeyValue - key's value.

    @param aStatus - active object status, get from CListener object.

    @param aPropertyCategory observed key's category.       

    @param aKey observed key.

    */

	void CBackupSubscriber::NotifyKeyAndStatusL( 

		const TInt aKeyValue,

		TRequestStatus& aStatus,

		const TUid aPropertyCategory,

		const TUint aKey );

private:

    /**

     * Default constructor, implicitly called by NewL().

     */

    CBackupSubscriber( MBackupRestoreObserver& aObserver );

    /**

     * 2nd phase construction, called by NewL().

     */

    void ConstructL();

    /**

     * Check Backup & Restore's state key status and act accordingly.

     */

    void CheckBackupState( const TInt aKeyValue, TRequestStatus& aStatus );

private: // data

	/*iPropertyWatcher - constains observed key's, owned by this class*/

	CPropertyWatcher* iPropertyWatcher;

	/*iObserver - callback for HarvesterAO to notify when backup/restore starts.*/

	MBackupRestoreObserver& iObserver;

  	};

#endif // CTBACKUPSUBSCRIBER_H