/*

* 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:  Virtual class defining an interface for an observer which gets

*                notified when the topic list is changed. 

*

*/

#ifndef     MCBSDBTOPICLISTOBSERVER_H

#define     MCBSDBTOPICLISTOBSERVER_H

//  INCLUDES

#include <e32base.h>

#include "CbsCommon.h"

//  CLASS DECLARATION 

/**

*   This class defines the interface for topic list observers.

*/

class MCbsDbTopicListObserver

    {

    public:        // New functions

        /**

        *   Indicates that the topic list has been initialized.

        */

        virtual void TopicListInitializedIndL() = 0;

        /**

        *   Indicates that a new topic has been added.

        *

        *   @param  aNumber         Number of the topic that has been added

        */

        virtual void TopicAddedIndL( const TCbsDbTopicNumber& aNumber ) = 0;

        /**

        *   Indicates that a topic has been deleted.

        *

        *   @param  aNumber         Number of the topic that was deleted.

        */

        virtual void TopicDeletedIndL( const TCbsDbTopicNumber& aNumber ) = 0;

        /**

        *   Indicates that a topic has been modified.

        *

        *   @param  aNumber         Number of the topic that has been modified.

        */

        virtual void TopicModifiedIndL( const TCbsDbTopicNumber& aNumber ) = 0;

        /**

        *   Indicates that a topic has received a new message.

        *

        *   @param  aNumber         Number of the topic that has received 

        *                           a new message.

        */

        virtual void TopicNewMessageReceivedIndL( 

            const TCbsDbMessageHandle& aNumber ) = 0;

    };

#endif      //  MCBSDBTOPICLISTOBSERVER_H   

// End of File