/*+
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description:  	This class inherits the common functionalities for requests to the +
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*				Location Monitor from EPos_CPosLocMonitorReqHandlerBase.h and also+
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*				implements the functions specific to empty last known position store req.+
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*+
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*/+
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+
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#include "EPos_CPosEmptyLastKnownPosStoreHandler.h"+
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#include  "EPos_CPosCallbackTimer.h"+
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+
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+
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// ============================ CONSTANTS ===========================================================+
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#ifdef _DEBUG+
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_LIT(KTraceFileName, "EPos_CPosEmptyLastKnownPosStoreHandler.cpp");+
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#endif+
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+
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+
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// ============================== MEMBER FUNCTIONS ===================================================+
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CPosEmptyLastKnownPosStoreHandler* CPosEmptyLastKnownPosStoreHandler::NewL()+
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	{+
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	CPosEmptyLastKnownPosStoreHandler* self = new( ELeave ) CPosEmptyLastKnownPosStoreHandler();+
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	CleanupStack::PushL( self );+
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	self->ConstructL();+
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	CleanupStack::Pop( self );+
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	return self;+
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	}+
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+
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CPosEmptyLastKnownPosStoreHandler::CPosEmptyLastKnownPosStoreHandler()+
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+
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	{+
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	CActiveScheduler::Add(this);+
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	}+
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+
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void CPosEmptyLastKnownPosStoreHandler::ConstructL()+
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	{+
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    TCallBack timeoutCallBack(HandleTimeOut, this);+
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    iTimeoutTimer = CPosCallbackTimer::NewL(timeoutCallBack);+
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	}+
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+
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CPosEmptyLastKnownPosStoreHandler::~CPosEmptyLastKnownPosStoreHandler()+
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	{+
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	+
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	if (iStatus==KRequestPending)+
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		{+
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		// Cancel the request sent to the location monitor+
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		Cancel();+
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		}+
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	// The requests on the queue are completed by the base class destructor+
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	+
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	delete iTimeoutTimer;+
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	}+
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+
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/** +
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 * EmptyLastKnownPosStoreL +
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 * 		>>  Initiate a new request with the location monitor if the request queue is empty. +
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 * 			Otherwise, check if the session id of any request on the queue matches that of the +
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 *			new request [ie. a duplicate request from the client]. If it matches panic the client. +
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 * 			If not add the new request to the queue. 		 +
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 *+
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 * @param  aLocMonSession    - The handle to the session with the location monitor passed on from+
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 * 							   CPosLocMonitorReqHandlerHub.+
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 * @param  aMessage  		 - The new request from the client +
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 */+
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void CPosEmptyLastKnownPosStoreHandler::EmptyLastKnownPosStoreL(const RLbsLocMonitorSession& aLocMonSession, const RMessage2& aMessage)+
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	{+
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	DEBUG_TRACE("CPosEmptyLastKnownPosStoreHandler::EmptyLastKnownPosStoreL", __LINE__)+
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+
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	if (!(aLocMonSession.Handle()))+
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		{+
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		// Session with the location monitor is not found+
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		RequestComplete(aMessage, KErrCouldNotConnect);+
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		return;+
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		}+
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	// Check the session id of the new request before adding to the queue of requests.+
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	CheckAndAddReqToQueueL(EReqOnSession, aMessage);+
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	+
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	if ((iLocMonitorReqQ.Count()>0) && !IsActive())+
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		{+
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		// Store the session handle for use in a subsequent cancel request+
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		iLocMonitorSession = const_cast<RLbsLocMonitorSession&> (aLocMonSession);+
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+
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		// Initiate a new last known position request with the location monitor+
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		iLocMonitorSession.WipeOutDatabase(iStatus);+
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		SetActive();+
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		+
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	    // Start timer if necessary+
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	    if (KEmptyLastKnownPosStoreTimeOut.Int64()>0)+
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	        {+
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	        DEBUG_TRACE("CPosEmptyLastKnownPosStoreHandler::EmptyLastKnownPosStoreL() Start Timeout Timer", __LINE__)+
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	        iTimeoutTimer->StartTimer(KEmptyLastKnownPosStoreTimeOut);+
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	        }+
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	    +
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		}+
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+
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	}+
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+
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/** +
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 * CancelEmptyLastKnownPosStoreL +
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 * 		>> Cancel the outstanding request with the location monitor if there is only one request on the queue. +
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  *		>> Otherwise just complete the cancel request with KErrNone, remove the original request from the queue+
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 * 		   and complete it with KErrCancel.+
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 * @param  aMessage  		 - The cancel request from the client +
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 */+
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void CPosEmptyLastKnownPosStoreHandler::CancelEmptyLastKnownPosStoreL(const RMessage2& aMessage)+
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	{+
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	DEBUG_TRACE("CPosEmptyLastKnownPosStoreHandler::CancelEmptyLastKnownPosStoreL", __LINE__)+
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+
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	// The subsession with the location monitor is not found+
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	if (!(iLocMonitorSession.Handle()))+
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		{+
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		RequestComplete(aMessage, KErrCouldNotConnect); //TODO - Validate KErrCouldNotConnect +
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		return;+
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		}+
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	+
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	// Call CancelRequest inherited from the baseclass+
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	CancelRequest(EReqOnSession, aMessage);+
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+
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	}+
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+
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/** +
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 * RunL +
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 * 		>> Complete all the requests on the queue.+
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 */+
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void CPosEmptyLastKnownPosStoreHandler::RunL()+
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	{+
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	// Cancel the timeout timer+
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	iTimeoutTimer->Cancel();+
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	+
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	// Complete all the requests in the queue with the result +
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	// of the empty last known position store operation+
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	QRequestsComplete(iStatus.Int());+
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+
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	}+
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+
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TInt CPosEmptyLastKnownPosStoreHandler::RunError(TInt aError)+
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	{+
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	return aError;+
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	}+
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+
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/** +
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 * DoCancel +
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 * 		>> Cancel the active object.+
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 */+
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void CPosEmptyLastKnownPosStoreHandler::DoCancel()+
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	{+
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	__ASSERT_DEBUG((iLocMonitorSession.Handle())!=NULL, DebugPanic(EPosServerPanicPositionerNotInitialized));+
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	+
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	// Cancel the timer as the request with the location monitor is going to be cancelled+
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	iTimeoutTimer->Cancel();+
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+
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	DEBUG_TRACE("calling RLbsAreaPositioner::CancelDatabaseWipeOut()", __LINE__)+
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	TInt err = iLocMonitorSession.CancelDatabaseWipeOut();+
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	// As the cancel request is immediately completed, this return value +
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	// is not useful.+
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	}+
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+
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+
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/** +
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 * HandleTimeOut +
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 * 		>> Complete all the requests on the queue with KErrTimedOut.+
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 * @param  aRequestHandler - self pointer used to call the appropriate timeout handling method+
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 */+
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TInt CPosEmptyLastKnownPosStoreHandler::HandleTimeOut(TAny* aRequestHandler)+
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    {+
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    DEBUG_TRACE("CPosEmptyLastKnownPosStoreHandler::HandleTimeOut()", __LINE__)    +
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    +
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    CPosEmptyLastKnownPosStoreHandler* self = reinterpret_cast<CPosEmptyLastKnownPosStoreHandler*>(aRequestHandler);+
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    // The request with the location monitor has timed out. So complete all the outstanding +
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    // requests with KErrTimedOut+
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    self->QRequestsComplete(KErrTimedOut);+
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    +
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    // Cancel the pending request with the location monitor+
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    self->Cancel();+
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+
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    return KErrNone;+
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    +
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    }+
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+
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