/*

* Copyright (c) 2003 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 get notifications from presence events.

*

*/

#ifndef __MIMPSCONNUIPRESENCEEVENTOBSERVERNG_H

#define __MIMPSCONNUIPRESENCEEVENTOBSERVERNG_H

#include <E32Std.h>

#include <impspresenceconnectionuiconstsng.h>

//FORWARD DECLARATION

class CIMPSConnUiPresEventNotifier;

class CPEngNWSessionSlotID2;

/**

 * Observer interface to get notifcations from

 * presence events.

 *

 * This interface can be reqisterd both standard

 * event notifier (CIMPSConnUiPresEventNotifier)

 * and the client filtered event notifier

 * (CIMPSConnUiClntFilteredPresEventNotifier).

 *

 * @since 2.1

 */

NONSHARABLE_CLASS( MIMPSConnUiPresenceEventObserver )

    {

public: //notify methods

    /**

     * Notifies from presence event.

     *

     * If event handling causes a leave, leave is

     * reported back to HandlePresenceEventNotifyError()

     * callback.

     *

     * @since 2.1

     * @param aNotifier The presence notifier where this

     * event is coming from.

     * @param aEvent The presence event.

     */

    virtual void HandlePresenceEventL( CIMPSConnUiPresEventNotifier* aNotifier,

                                       const CPEngNWSessionSlotID2& aSessionSlotID,

                                       TIMPSConnectionClient aClient,

                                       TIMPSPresenceServiceEvent aEvent ) = 0;

    /**

     * Called when presence event listening or event

     * handling fails.

     *

     * Here is reported both errors from handling the

     * actual event and also asynchronously the errors

     * coming from starting the presence notify.

     *

     * When reporting the error, the notifier is stopped.

     * However, the observer may restart the notifier

     * during the notify callback if desired so.

     *

     * @since 2.1

     * @param aNotifier The presence notifier where this

     * error is coming from.

     * @param aError is the error code.

     */

    virtual void HandlePresenceEventNotifyError( CIMPSConnUiPresEventNotifier* aNotifier,

                                                 TInt aError ) = 0;

    };

#endif //__MIMPSCONNUIPRESENCEEVENTOBSERVERNG_H