// 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:

//

/**

 @file

 @internalTechnology

*/

#ifndef __CMTPREQUESTPROCESSOR_H__

#define __CMTPREQUESTPROCESSOR_H__

#include <e32base.h>

#include <mtp/mtpdataproviderapitypes.h>

#include <mtp/mtpprotocolconstants.h>

#include <mtp/tmtptyperesponse.h>

#include <mtp/tmtptypenull.h>

#include "cmtprequestchecker.h"

#include "mtpdebug.h"

class MMTPConnection;

class TMTPTypeRequest;

class CMTPDataProviderPlugin;

class MMTPDataProviderFramework;

class TMTPTypeEvent;

class CMTPObjectInfo;

/** 

Defines a request processor interface

@internalTechnology

*/	

class MMTPRequestProcessor

	{

public:	

	/**

	Process a request from the initiator

	@param aRequest	The request to be processed

	@param aPhase	The transaction phase of the request

	@return ETrue to signal that the processor object can be deleted, EFalse to keep the processor object

	*/

	virtual TBool HandleRequestL(const TMTPTypeRequest& aRequest, TMTPTransactionPhase aPhase) = 0;

	/**

	Process an event from the initiator

	@param aEvent	The event to be processed

	*/

	virtual void HandleEventL(const TMTPTypeEvent& aEvent) = 0;

	/**

	delete the request processor object

	*/

	virtual void Release() = 0;

	/**

	Check if the processor matches the request on the connection

	@param aRequest	The request to be checked

	@param aConnection The connection from which the request comes

	@return ETrue to indicate the processor can handle the request, otherwise, EFalse

	*/

	virtual TBool Match(const TMTPTypeRequest& aRequest, MMTPConnection& aConnection) const = 0;

	/**

	Check if the processor matches the event on the connection

	@param aEvent The event to be checked

	@param aConnection The connection from which the event comes

	@return ETrue to indicate the processor can handle the event, otherwise, EFalse

	*/	

	virtual TBool Match(const TMTPTypeEvent& aEvent, MMTPConnection& aConnection) const = 0;

	/**

	Get the request object which the processor is currently handling

	@return the request object which the processor is currently handling

	*/

	virtual const TMTPTypeRequest& Request() const = 0;

	/**

	Get the connection object associated with the current request object

	@return the connection object associated with the current request object

	*/

	virtual MMTPConnection& Connection() const = 0;

    /**

    Get the Session ID associated with the current request object

    @return Session ID associated with the current request object

    */	

	virtual TUint32 SessionId() = 0;

	};

/** 

Defines a processor factory function pointer

@internalTechnology

*/

typedef MMTPRequestProcessor* (*TMTPRequestProcessorCreateFunc)(

																MMTPDataProviderFramework& aFramework, 

																MMTPConnection& aConnection);

/** 

Defines an entry which maps from operation code to the request processor

@internalTechnology

*/																

typedef struct 

	{

	TUint16							iOperationCode;

	TMTPRequestProcessorCreateFunc	iCreateFunc;

	}TMTPRequestProcessorEntry;

/** 

Defines a generic request processor interface from which all processors derive

@internalTechnology

*/		

class CMTPRequestProcessor : public CActive, public MMTPRequestProcessor

	{

protected:	

	IMPORT_C CMTPRequestProcessor(

						MMTPDataProviderFramework& aFramework,

						MMTPConnection& aConnection,

						TInt aElementCount,

						const TMTPRequestElementInfo* aElements);

	IMPORT_C virtual ~CMTPRequestProcessor();	

protected:	//utility methods	

	IMPORT_C void SendResponseL(TMTPResponseCode aResponseCode, TInt aParameterCount = 0, TUint32* aParams = NULL);

	IMPORT_C void CompleteRequestL();

	IMPORT_C void SendDataL(const MMTPType& aData);

	IMPORT_C void ReceiveDataL(MMTPType& aData);

protected:	//	from MMTPRequestProcessor	

	IMPORT_C virtual TBool HandleRequestL(const TMTPTypeRequest& aRequest, TMTPTransactionPhase aPhase);

	IMPORT_C virtual void HandleEventL(const TMTPTypeEvent& aEvent);

	IMPORT_C virtual void Release();

	IMPORT_C virtual TBool Match(const TMTPTypeRequest& aRequest, MMTPConnection& aConnection) const;

	IMPORT_C virtual TBool Match(const TMTPTypeEvent& aEvent, MMTPConnection& aConnection) const;

	IMPORT_C virtual const TMTPTypeRequest& Request() const;

	IMPORT_C virtual MMTPConnection& Connection() const;

    IMPORT_C virtual TUint32 SessionId();

protected:	// from CActive

	IMPORT_C virtual void RunL();

	IMPORT_C virtual void DoCancel();

	IMPORT_C virtual TInt RunError(TInt aError);

protected:	//new virtuals 	

	IMPORT_C virtual TBool DoHandleRequestPhaseL();

	IMPORT_C virtual TBool DoHandleDataIToRPhaseL();

	IMPORT_C virtual TBool DoHandleRToIPhaseL();

	IMPORT_C virtual TBool DoHandleResponsePhaseL();

	IMPORT_C virtual TBool DoHandleCompletingPhaseL();

	IMPORT_C virtual TMTPResponseCode CheckRequestL();

	IMPORT_C virtual TBool HasDataphase() const;

	/**

	service a request at request phase

	*/

	IMPORT_C virtual void ServiceL() = 0;

private:

	void ExtractSessionTransactionId();					

protected:

	MMTPDataProviderFramework&	    iFramework;

	const TMTPTypeRequest*		    iRequest;			//the pending requst object

	MMTPConnection&				    iConnection;		//the connection from which the request comes

	TMTPTypeResponse			    iResponse;			//the response object to send to the initiator

	TBool						    iCancelled;			//indicates whether this request has been cancelled

	CMTPRequestChecker*		    	iRequestChecker;	//a utility class providing generic request verification service

	TInt					    	iElementCount;		//number of verification elements used for request checker

	const TMTPRequestElementInfo*	iElements;	 		//pointer to an array of verification elements

	TUint32						    iSessionId;			//session id for the pending request

	TUint32						    iTransactionCode;	//transaction code for the pending request

private:

	TMTPResponseCode 				iResponseCode;		// contains response from CheckRequestL call

	RBuf8 							iNullBuffer; 		// buffer to receive data from discarded data phase

	TMTPTypeNull 					iNull;

	/**

    FLOGGER debug trace member variable.

    */

    __FLOG_DECLARATION_MEMBER_MUTABLE;

	};

#endif // __CMTPREQUESTPROCESSOR_H__