/*

 * 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:   Definition of the event observer class

 *

 */

 #ifndef CSOURCEDOPPLEREVENTOBSERVER_H

 #define CSOURCEDOPPLEREVENTOBSERVER_H

 // INCLUDES

 #include <e32base.h>

 #include "SourceDopplerProxy.h"

 // CLASS DECLARATION

 /**

 *  Doppler event observer provides encapsulates a monitoring request towards the message handler.

 *

 *  @lib SourceDopplerProxy.lib

 *  @since 3.0

 */

 class CSourceDopplerEventObserver : public CActive

     {

     public: // Constructors and destructor

         /**

         * Two-phased constructor.

         */

         static CSourceDopplerEventObserver* NewL(TMMFMessageDestinationPckg aMessageHandler, MCustomCommand& aCustomCommand,

         								  MSourceDopplerCallback& aCallback);

         /**

         * Destructor.

         */

         virtual ~CSourceDopplerEventObserver();

     public: // New functions

         /**

         * Start event monitoring

         * @since 3.0

         */

         void Start();

        	/**

         * Stop event monitoring

         * @since 3.0

         */

         void Stop();

     private:

         /**

         * C++ default constructor.

         */

         CSourceDopplerEventObserver();

         /**

         * By default Symbian 2nd phase constructor is private.

         */

         void ConstructL(TMMFMessageDestinationPckg aMessageHandler, MCustomCommand& aCustomCommand,

         				MSourceDopplerCallback& aCallback);

         void RunL();

         void DoCancel();

     private:

 		// Pointer to custom command utility

 		MCustomCommand* iCustomCommand;

 		// Message handler handle

 		TMMFMessageDestinationPckg iMessageHandler;

 		// Doppler change event Callbacks

 		MSourceDopplerCallback* iCallback;

 		// Data package received from server

 		TEfDopplerDataPckg iDataPckgFrom;

 		//

 		TBool iStopped;

 	};

 #endif 		// CDOPPLEREVENTOBSERVER_H