/*

* Copyright (c) 2004 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:  Observer interface to receive NWSessionSlot change notifications.

*

*/

#ifndef __MPENGNWSESSIONSLOTOBSERVER2_H

#define __MPENGNWSESSIONSLOTOBSERVER2_H

//  INCLUDES

#include <E32Std.h>

// FORWARD DECLARATIONS

class CPEngNWSessionSlotNotifier2;

class CPEngNWSessionSlotEvent2;

// CLASS DECLARATION

/**

 * Observer interface to get NWSessionSlot change notifications.

 * Observer is registered to CPEngNWSessionSlotNotifier2.

 *

 * @since 3.0

 */

class MPEngNWSessionSlotObserver2

    {

    public: //Observing methods

        /**

         * NWSessionSlot change handler.

         *

         * Called by CPEngNWSessionSlotNotifier2 to report NWSessionSlot

         * changed events. If this method leaves, error code is

         * reported back to HandleNWSessionSlotError().

         *

         * @since 3.0

         * @param aNotifier The notifier source where notification

         *        is coming from. No ownership transferred.

         * @param aEvent The event container.  No ownership transferred.

         */

        virtual void HandleNWSessionSlotChangeL(

            CPEngNWSessionSlotNotifier2& aNotifier,

            CPEngNWSessionSlotEvent2& aEvent ) = 0;

        /**

         * Notification failure handler.

         *

         * @since 3.0

         * @param aError The error resulting from Presence Engine internal

         *        change event handling (e.g. out of memory) or

         *        leave error from HandleNWSessionSlotChangeL().

         * @param aNotifier The notifier of which event handling failed.

         *        No ownership transferred.

         */

        virtual void HandleNWSessionSlotError(

            TInt aError,

            CPEngNWSessionSlotNotifier2& aNotifier ) = 0;

    private: //Extensions

        /**

         * Reserved virtual table slots for future use.

         * Do not implement this.

         *

         * @since 3.0

         */

        virtual TInt NWSessionSlotObserverReserved() {

            return KErrNotSupported;

            }

    protected:  //Destructor

        /**

         * Protected destructor.

         * Observers can't be destroyed via this interface.

         */

        virtual ~MPEngNWSessionSlotObserver2() { }

    };

#endif //__MPENGNWSESSIONSLOTOBSERVER2_H

//End of file