/*

* Copyright (c) 2005 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:   

*

*/

#ifndef CMCENATSTATE_H

#define CMCENATSTATE_H

#include <e32base.h>

class TMceNatStateTransitionEvent;

//state indexes

typedef TUint TMceNatStateIndex;

const TMceNatStateIndex KMceNatStateInitializing = 0;

const TMceNatStateIndex KMceNatStateIdle = 1;

const TMceNatStateIndex KMceNatStateCreateOffer = 2;

const TMceNatStateIndex KMceNatStateCreateAnswer = 3;

const TMceNatStateIndex KMceNatStateDecodeOffer = 4;

const TMceNatStateIndex KMceNatStateDecodeAnswer = 5;

const TMceNatStateIndex KMceNatStateWait = 6;

const TMceNatStateIndex KMceNatStateConnected = 7;

const TMceNatStateIndex KMceNatStateCreateOfferRequested = 8;

/**

*  MCE SIP state transition handler

*

*  @lib 

*  @since

*/

class MMceNatStateTransitionHandler

	{

public:

	/**

	* Hanldes state transition message and executes

	* necessary actions

	* @param aEvent atransition event

	*/

    virtual void EntryL( TMceNatStateTransitionEvent& aEvent ) = 0;

	/**

	* Resolves state to which current state exit

	* @param aEvent atransition event

	*/

    virtual void ExitL( TMceNatStateTransitionEvent& aEvent ) = 0;

	};

/**

*  MCE SIP state machine

*

*  @lib 

*  @since

*/

class CMceNatState : public CBase

	{

public: // Constructors and destructor

	/**

	* Destructor.

	*/

	virtual ~CMceNatState();

public: // New functions

	/**

	* Checks if state accepts event

	* @param aEvent atransition event

	*/

    virtual TBool Accept( TMceNatStateTransitionEvent& aEvent ) = 0;

	/**

	* Returns transition handler

	* @return transition handler

	*/

    virtual MMceNatStateTransitionHandler& TransitionHandler() = 0;

protected: // Constructors and destructor

	/**

	* Constructor

	*/

    CMceNatState();

	};

#endif // CMCENATSTATE_H

// End of File