// Copyright (c) 2008-2009 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:

//

/**

 @file

 @InternalComponent

*/

#ifndef __LBSREQUESTHANDLER_H__

#define __LBSREQUESTHANDLER_H__

#include <e32base.h>

#include <lbssatellite.h>

#include <lbsposition.h>

#include <lbscriteria.h>

#include "lbstimer.h" // for MLbsCallbackTimerObserver & CLbsCallbackTimer

#include "LbsInternalInterface.h"

class CPositionerQ;

class TRequestParameters;

class MPositioner;

class CRequestHandler : public CBase, public MLbsCallbackTimerObserver

	{

	public:		

		virtual ~CRequestHandler();

		virtual void ReMergeWithCancelRequestL(TInt aError);

        virtual void CancelRequestL();

	    virtual void SubmitNewRequestL(MPositioner* aNewRequest);

	    virtual void WarmDownTimerExpired();

    	void NotifyRequestComplete();

    	// from MLbsCallbackTimerObserver

		void OnTimerEventL(TInt aTimerId);

		TInt OnTimerError(TInt aError, TInt aTimerId);

		enum TEventId // timer event ID at request queue level

			{

			EPowerStandByTimerEvent = 0

			};

		enum TRequestHandlerPanic

			{

			KUnknownTimerEventId

			};

	protected:

		CRequestHandler();

		void ConstructL();

		virtual void IssueStatus(TBool aTracking, TLbsPositionUpdateRequestBase::TPowerAdvice aPower = TLbsPositionUpdateRequestBase::ENoPowerAdvice) = 0;

		virtual void IssueCancel(TBool aTracking, TLbsPositionUpdateRequestBase::TPowerAdvice aPower = TLbsPositionUpdateRequestBase::EPowerAdviceStandby) = 0;

		virtual void IssueMergedRequestL() = 0;

		void BuildUpdateRequest(TLbsLocRequestQuality& aRequest, const TTimeIntervalMicroSeconds& aTimeForFix, const TPositionQuality& aQuality);

		virtual TInt MergeRequest(const TRequestParameters* aRequestParameters,

							const TBool aTracking,

							TLbsPositionUpdateRequestBase::TPowerAdvice aPower = TLbsPositionUpdateRequestBase::ENoPowerAdvice) = 0;

		virtual void ResetMergedRequest() = 0;

	protected:	

		TLbsPositionUpdateRequest iMergedRequest;					// next potential position update request

		TLbsPositionUpdateRequest iCurrentRequest;					// current update request that's on the bus

		CPositionerQ* iPositionerQ;

	private:

		void SubmitRequestL();

		TBool MergedDifferent();

		void MergeAllRequests();

		TInt MergeNewRequest(TInt aNewRequest);

		void TimeOutTimerEvent();

		TInt TimeOutTimerError(TInt /*aError*/);

        TUint iTrackingCount;

		CLbsCallbackTimer* iPowerStandByTimer; // sends a standby if no requests in the queue

	};

#endif // __LBSREQUESTHANDLER_H__