// Copyright (c) 2006-2009 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:

//

#include <mtp/mtpprotocolconstants.h>

#include <mtp/tmtptyperequest.h>

#include <mtp/mmtpdataproviderframework.h>

#include <mtp/tmtptypeevent.h>

#include <mtp/mmtpconnection.h>

#include <mtp/mmtpobjectmgr.h>

#include "cmtprequestprocessor.h"

#include "cmtprequestchecker.h"

const static TInt KNullBufferSize = 4096;

__FLOG_STMT(_LIT8(KComponent,"MTPRequestProcessor");)

/**

Standard c++ constructor

@param aFramework	The data provider framework

@param aConnection	The connection from which the request comes

@param aElementCount Number of element in the request.

@param aElements	The element info data.

@return a pointer to the created request processor object

*/   

EXPORT_C CMTPRequestProcessor::CMTPRequestProcessor(

											MMTPDataProviderFramework& aFramework,											

											MMTPConnection& aConnection,

											TInt aElementCount,

											const TMTPRequestElementInfo* aElements)

	:CActive(EPriorityStandard),

	iFramework(aFramework),

	iConnection(aConnection),

	iElementCount(aElementCount),

	iElements(aElements)

	{

	CActiveScheduler::Add(this);

	__FLOG_OPEN(KMTPSubsystem, KComponent);

	}

/**

Destructor

*/	

EXPORT_C CMTPRequestProcessor::~CMTPRequestProcessor()

	{

	Cancel();

	iNullBuffer.Close();

	delete iRequestChecker;

	__FLOG_CLOSE;

	}

/**

Relese (delete) this request processor

*/	

EXPORT_C void CMTPRequestProcessor::Release()

	{

	delete this;

	}

/**

Send a response to the initiator

@param aResponseCode The response code to send

@param aParamCount	The number of parameters

@param aParmas	The pointer to array of parameters

*/	

EXPORT_C void CMTPRequestProcessor::SendResponseL(TMTPResponseCode aResponseCode, TInt aParameterCount, TUint32* aParams)

    iResponse.SetUint32(TMTPTypeResponse::EResponseSessionID, iSessionId);

/**

The current active request

@return A reference to the current request

*/	

EXPORT_C const TMTPTypeRequest& CMTPRequestProcessor::Request() const

	{

	__ASSERT_DEBUG(iRequest, User::Invariant()); 

	return *iRequest;

	}

/**

The connection from which the current request comes

@return A reference to the current connection

*/	

EXPORT_C MMTPConnection& CMTPRequestProcessor::Connection() const

	{

	return iConnection;

	}

/**

The Session ID from the current request

@return the value of the session ID

 */

EXPORT_C TUint32 CMTPRequestProcessor::SessionId()

    {

    return iSessionId;

    }

/**

Signal to the framework that the current request transaction has completed

*/

EXPORT_C void CMTPRequestProcessor::CompleteRequestL()

	{

	__ASSERT_DEBUG(iRequest, User::Invariant()); 

	iFramework.TransactionCompleteL(*iRequest, iConnection);

	}

/**

Send data to the initiator

@param aData	The data to send

*/	

EXPORT_C void CMTPRequestProcessor::SendDataL(const MMTPType& aData)

	{

	__ASSERT_DEBUG(iRequest, User::Invariant()); 

	iFramework.SendDataL(aData, *iRequest, iConnection);

	}

/**

Receive data from the initiator

@param aData 	The data to receive

*/

EXPORT_C void CMTPRequestProcessor::ReceiveDataL(MMTPType& aData)

	{

	__ASSERT_DEBUG(iRequest, User::Invariant()); 

	iFramework.ReceiveDataL(aData, *iRequest, iConnection);

	}

/**

Handle the request

@param aRequest	The request to be processed

@param aPhase	The current transaction phase of the request

@return ETrue if the transaction has completed, otherwise, EFalse

*/	

EXPORT_C TBool CMTPRequestProcessor::HandleRequestL(const TMTPTypeRequest& aRequest, TMTPTransactionPhase aPhase)

	{

	iRequest = &aRequest;

	__ASSERT_DEBUG(iRequest, User::Invariant()); 

	TBool result = EFalse;

	switch(aPhase)

		{

		case ERequestPhase:		

			ExtractSessionTransactionId();

			result = DoHandleRequestPhaseL();

			break;

		case EDataIToRPhase:

			result = DoHandleDataIToRPhaseL();

			break;

		case EDataRToIPhase:

			result = DoHandleRToIPhaseL();

			break;

		case EResponsePhase:

			if (iResponseCode != EMTPRespCodeOK && HasDataphase())

				{

				SendResponseL(TMTPResponseCode(iResponseCode));

				iNullBuffer.Close();

				}

			else

				{

				result = DoHandleResponsePhaseL();	

				}

			break;

		case ECompletingPhase:

			result = DoHandleCompletingPhaseL();

			break;

		}

	return result;	

	}

/**

Handle the event

@param aEvent The event to be processed

*/	

EXPORT_C void CMTPRequestProcessor::HandleEventL(const TMTPTypeEvent& aEvent)

	{

	TUint16 eventCode = aEvent.Uint16(TMTPTypeEvent::EEventCode);

	iCancelled = (eventCode == EMTPEventCodeCancelTransaction);

	}

/**

Check whether the processor can process the request

@param aRequest The request to be processed

@param aConnection The connection from which the request comes

@return ETrue if the processor can process the request, otherwise EFalse

*/	

EXPORT_C TBool CMTPRequestProcessor::Match(const TMTPTypeRequest& aRequest, MMTPConnection& aConnection) const

	{

	__ASSERT_DEBUG(iRequest, User::Invariant()); 

	TBool result = ((&aRequest == iRequest) && (&iConnection == &aConnection));

	return result;		

	}

/**

Check whether the processor can process the event

@param aEvent The event to be processed

@param aConnection The connection from which the request comes

@return ETrue if the processor can process the request, otherwise EFalse

*/	

EXPORT_C TBool CMTPRequestProcessor::Match(const TMTPTypeEvent& aEvent, MMTPConnection& aConnection) const

	{

	TUint32 eventSessionId = aEvent.Uint32(TMTPTypeEvent::EEventSessionID);

	TUint32 eventTransactionCode = aEvent.Uint32(TMTPTypeEvent::EEventTransactionID);

	TBool result = EFalse;

	if(iSessionId == eventSessionId && 

		iTransactionCode == eventTransactionCode &&

		&iConnection == &aConnection)

		{

		result = ETrue;

		}

	return result;	

	}

/**

Handle the request phase of the current request

@return EFalse

*/

EXPORT_C TBool CMTPRequestProcessor::DoHandleRequestPhaseL()

	{

	__FLOG(_L8("DoHandleRequestPhaseL - Entry."));

	TRAPD(err, iResponseCode = CheckRequestL());

	if ((err != KErrNone) || (iResponseCode != EMTPRespCodeOK))

		{

		if (HasDataphase()) 

			{

			// If we have a dataphase

			// we need to read in the data and discard it

			__FLOG(_L8("Response code is not OK, there is data phase."));			

			iNullBuffer.Close();

			iNullBuffer.CreateMaxL(KNullBufferSize);

			iNull.SetBuffer(iNullBuffer);

			ReceiveDataL(iNull);

			}

		else

			{

			if(err != KErrNone)

				{

				User::Leave(err);

				}

			SendResponseL(TMTPResponseCode(iResponseCode));

			}

		}

	else

		{

		TRAP(err, ServiceL());		

		if (err != KErrNone)

			{

			iResponseCode = EMTPRespCodeGeneralError;

			if (HasDataphase())

				{				

				// If we have a dataphase

				// we need to read in the data and discard it		

				iNullBuffer.Close();

				iNullBuffer.CreateMaxL(KNullBufferSize);					

				iNull.SetBuffer(iNullBuffer);			

				ReceiveDataL(iNull);		

				}

			else

				{

				User::Leave(err);

				}			

			}

		}

	__FLOG(_L8("DoHandleRequestPhaseL - Exit."));	

	return EFalse;	

	}

/**

Handle the receiving data phase of the current request

@return EFalse

*/	

EXPORT_C TBool CMTPRequestProcessor::DoHandleDataIToRPhaseL()

	{

	User::Invariant();

	return EFalse;

	}

/**

Handle the sending data phase of the current request

@return EFalse

*/		

EXPORT_C TBool CMTPRequestProcessor::DoHandleRToIPhaseL()

 	{

	User::Invariant();

	return EFalse;

	}

/**

Handle the response phase of the current request

@return EFalse

*/		

EXPORT_C TBool CMTPRequestProcessor::DoHandleResponsePhaseL()

	{

	TMTPResponseCode responseCode = (iCancelled ? EMTPRespCodeIncompleteTransfer : EMTPRespCodeOK);

	SendResponseL(responseCode);

	return EFalse;

	}

/**

Handle the completing phase of the current request

@return ETrue

*/		

EXPORT_C TBool CMTPRequestProcessor::DoHandleCompletingPhaseL()

	{

	CompleteRequestL();

	return ETrue;	

	}

/**

Check the current request

@return EMTPRespCodeOK if the reqeust is good, otherwise, one of the error response codes

*/

EXPORT_C TMTPResponseCode CMTPRequestProcessor::CheckRequestL()

	{

	if(!iRequestChecker)

		{

		iRequestChecker = CMTPRequestChecker::NewL(iFramework, iConnection);	

		}	

	__ASSERT_DEBUG(iRequest, User::Invariant()); 		

	return iRequestChecker->VerifyRequestL(*iRequest, iElementCount, iElements);

	}

/**

part of active object framework, provide default implementation

*/

EXPORT_C void CMTPRequestProcessor::RunL()

	{

	}

/**

part of active object framework, provide default implementation

*/

EXPORT_C void CMTPRequestProcessor::DoCancel()

	{

	}

/**

part of active object framework, provide default implementation

*/

EXPORT_C TInt CMTPRequestProcessor::RunError(TInt /*aError*/)

	{

	TRAP_IGNORE(SendResponseL(EMTPRespCodeGeneralError));

	return KErrNone;

	}

EXPORT_C TBool CMTPRequestProcessor::HasDataphase() const

	{

	return EFalse;

	}

/**

retrieve the session id and transaction code from the current request

*/

void CMTPRequestProcessor::ExtractSessionTransactionId()

	{    

	iSessionId = iRequest->Uint32(TMTPTypeRequest::ERequestSessionID);    

	iTransactionCode = iRequest->Uint32(TMTPTypeRequest::ERequestTransactionID);		

	}