/*
 *	DNN - Data News Network
 *
 *	by Stephane Chatty
 *
 *	Copyright 1993-1996
 *	Centre d'Etudes de la Navigation Aerienne (CENA)
 *
 *	Behaviours.
 *
 *	$Id$
 *	$CurLog$
 */

#ifndef DnnBehaviour_H_
#define DnnBehaviour_H_

#include "cplus_bugs.h"
#include "Reaction.h"
#include "ccu/String.h"
#include "ccu/List.h"

class DnnBehaviour;
class DnnTransition;
class DnnEvent;

class DnnToken {
public:
		DnnToken ();
virtual		~DnnToken ();
};

typedef void (DnnActivation) (DnnBaseReaction*, DnnToken*);
typedef void (DnnAction) (DnnToken*, DnnEvent*);

class DnnState {
protected:
	CcuString	Name;
	CcuListOf <DnnTransition>	Transitions;
public:
		DnnState (const char*);
		~DnnState ();
	DnnTransition*	CreateTransition (const char*, DnnState*, DnnActivation*, DnnAction*);
	void	Activate (DnnBehaviour*, DnnToken*);
	
};

class DnnTransition {
protected:
	CcuString	Name;
	DnnState*	From;
	DnnState*	To;
	DnnActivation*	Activation;
	DnnAction*	Action;

public:
		DnnTransition (const char*, DnnState*, DnnState*, DnnActivation*, DnnAction*);
		~DnnTransition ();
inline	DnnState*	GetDestination () const	{ return To;}
inline	DnnState*	GetOrigin () const	{ return From;}
	void	Activate (DnnBaseReaction*, DnnToken*);
	DnnState*	Fire (DnnToken*, DnnEvent*);
};


class DnnBehaviourModel {
protected:
	DnnState*	Initial;
	CcuListOf <DnnState>	States;
public:
		DnnBehaviourModel ();
		~DnnBehaviourModel ();
inline	DnnState*	GetInitial () const	{ return Initial; }
inline	void	SetInitial (DnnState* s)	{ Initial = s; }
	DnnState*	CreateState (const char* = 0);
};

class DnnBehaviour {
friend	class	DnnBehaviourReaction;
protected:
	DnnBehaviourModel*	TheModel;
	DnnState*	CurState;
	CcuListOf <DnnBaseReaction>	CurReactions;
	DnnToken*	CurToken;
	void	Fire (DnnTransition*, DnnEvent*);
public:
		DnnBehaviour (DnnBehaviourModel&, DnnToken*);
		~DnnBehaviour ();
inline	void	AddReaction (DnnBaseReaction* r) { CurReactions.Append (r); }

};

class DnnBehaviourReaction : public DnnBaseReaction {
protected:
	DnnBehaviour*	TheBehaviour;
	DnnTransition*	TheTransition;
public:
		DnnBehaviourReaction (DnnBehaviour*, DnnTransition*);
		~DnnBehaviourReaction ();
	void	Manage (DnnEvent&);
};	

#endif	/* DnnBehaviour_H_ */