/*

 * 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:   Implementation of the active event observer.

 *

 */

 // INCLUDE FILES

 #ifdef _DEBUG

 #include 	<e32svr.h>

 #endif

 #include 	"LoudnessEventObserver.h"

 // ============================ MEMBER FUNCTIONS ===============================

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::CLoudnessEventObserver

 // C++ default constructor can NOT contain any code, that

 // might leave.

 // -----------------------------------------------------------------------------

 //

 CLoudnessEventObserver::CLoudnessEventObserver()

     :   CActive(CActive::EPriorityStandard),

     	iStopped(EFalse)

     {

     }

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::ConstructL

 // Symbian 2nd phase constructor can leave.

 // -----------------------------------------------------------------------------

 //

 void CLoudnessEventObserver::ConstructL(

 	TMMFMessageDestinationPckg aMessageHandler,

 	MCustomCommand& aCustomCommand,

 	MLoudnessCallback& aCallback )

     {

     CActiveScheduler::Add(this);

 	iMessageHandler = aMessageHandler;

 	iCustomCommand = &aCustomCommand;

 	iCallback = &aCallback;

 	}

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::NewL

 // Two-phased constructor.

 // -----------------------------------------------------------------------------

 //

 CLoudnessEventObserver* CLoudnessEventObserver::NewL(

 	TMMFMessageDestinationPckg aMessageHandler,

 	MCustomCommand& aCustomCommand,

 	MLoudnessCallback& aCallback )

     {

     CLoudnessEventObserver* self = new(ELeave) CLoudnessEventObserver();

     CleanupStack::PushL(self);

     self->ConstructL(aMessageHandler, aCustomCommand, aCallback);

     CleanupStack::Pop(self);

     return self;

     }

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::~CLoudnessEventObserver

 // Destructor

 // -----------------------------------------------------------------------------

 //

 CLoudnessEventObserver::~CLoudnessEventObserver()

     {

     // We should not have to cancel the outstanding request because the message

     // handler will complete our request with KErrCancel in its destructor.

     Cancel();

     }

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::Start

 // Kickoff the event observer by issuing the first observation message.

 // -----------------------------------------------------------------------------

 //

 void CLoudnessEventObserver::Start()

     {

 	if( !iStopped && !IsActive() )

 		{

     	iCustomCommand->CustomCommandAsync(iMessageHandler, (TInt)ELefObserve, KNullDesC8, KNullDesC8, iDataPckgFrom, iStatus);

     	iStopped = EFalse;

     	SetActive();

 		}

     }

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::Stop

 // -----------------------------------------------------------------------------

 //

 void CLoudnessEventObserver::Stop()

     {

 	iStopped = ETrue;

     }

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::RunL

 // Invoke by the active scheduler when a request completes, In this case, our

 // observation message has completed.

 // The proxy is notified. Afterwards, reissue the request to continue observation.

 // -----------------------------------------------------------------------------

 //

 void CLoudnessEventObserver::RunL()

     {

 #ifdef _DEBUG

     RDebug::Print(_L("CLoudnessEventObserver::RunL()\n"));

 #endif

 	if( iStatus == KErrNone )

 		{

 		iCallback->LoudnessEvent(iDataPckgFrom);

 		Start();

 		}

 	else

 		{

 		iStopped = ETrue;

 		}

     }

 // -----------------------------------------------------------------------------

 // CLoudnessEventObserver::DoCancel

 // Cancels the current and any on going requests/tasks.

 // -----------------------------------------------------------------------------

 //

 void CLoudnessEventObserver::DoCancel()

     {

 #ifdef _DEBUG

     RDebug::Print(_L("CLoudnessEventObserver::DoCancel()\n"));

 #endif

     iStopped = ETrue;

     }

 // End of file