/*

* Copyright (c) 2007 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:  Channel change handler

*

*/

#ifndef CSENSRVCHANNELCHANGEHANDLER_H

#define CSENSRVCHANNELCHANGEHANDLER_H

#include <e32base.h>

#include "sensrvclient.h"

#include "sensrvchannelinfo.h"

class MSensrvChannelChangeHandlerObserver;

/**

 *  Channel Change handler class

 *

 *  @lib sensrvclient.lib

 *  @since S60 5.0

 */

NONSHARABLE_CLASS( CSensrvChannelChangeHandler ) : public CActive

    {

    public:

        static CSensrvChannelChangeHandler* NewL( RSensrvClient& aSensrvClient );

        static CSensrvChannelChangeHandler* NewLC( RSensrvClient& aSensrvClient );

        /**

        * Destructor

        */

        virtual ~CSensrvChannelChangeHandler();        

    public:

        /**

        * Start channel change listening. Send request to server.

        * 

        * @since S60 5.0

        * @param aChannelChangeObserver Channel change observer

        * @param aSearchParameters Search parameters.

        */

        void StartListening( MSensrvChannelChangeHandlerObserver* aChannelChangeObserver,

                             const TSensrvChannelInfo& aSearchParameters );

    protected: // From CActive

          void DoCancel();

          void RunL();

          TInt RunError(TInt aError);

    private:

        /**

        * Constructor

        */

        CSensrvChannelChangeHandler( RSensrvClient& aSensrvClient );

        /**

        * Create and send request to server

        */

        void CreateAndSendRequest();

    private: // data

        /**

        * Client

        * Not own.

        */

        RSensrvClient& iSensrvClient;

        /**

        * Observer

        * Not own.         

        */

        MSensrvChannelChangeHandlerObserver* iObserver;       

        /**

        * Server writes channel info of new or removed channel here.

        */

        TSensrvChannelInfoPckgBuf iChannelInfoPckgBuf;

        /**

        * Server writes type of change here.

        */

        TSensrvTSensrvChannelChangeTypePckgBuf iChangeTypePckgBuf;

        /**

        * Error count

        */

        TInt iErrorCount;

        /**

        * Stores the current search parameters.

        */

        TSensrvChannelInfoPckgBuf iSearchParameterBuf;

    };

#endif // CSENSRVCHANNELCHANGEHANDLER_H