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

#ifndef DnnSource_H_
#define DnnSource_H_

#include "cplus_bugs.h"
template <class ITEM> class CcuArrayOf;
template <class ITEM> class CcuHashTableOf;
class DnnTrigger;
class DnnEvent;
class DnnBaseReaction;


class DnnEventSource {
protected:
		DnnEventSource ();
virtual		~DnnEventSource ();
	void	Emit (DnnEvent*);
virtual	void	DispatchEvent (DnnEvent*) = 0;
};

class DnnEventSelector {
public:
		DnnEventSelector ();
virtual		~DnnEventSelector ();
virtual	DnnTrigger*	FindTrigger (DnnEvent*) = 0;
};

typedef int (*DnnIntExtractor) (DnnEvent*);

class DnnEventIntSelector : public DnnEventSelector {
protected:
	DnnIntExtractor	IdExtractor;
	int	MaxSize;
	CcuArrayOf<DnnTrigger>	*Triggers;
public:
		DnnEventIntSelector (DnnIntExtractor, int);
		~DnnEventIntSelector ();
	DnnTrigger*	UseTrigger (int);
	void	UnuseTrigger (int, DnnBaseReaction*);
	DnnTrigger*	FindTrigger (DnnEvent*);
};

typedef void* (*DnnPtrExtractor) (DnnEvent*);

class DnnEventPtrSelector : public DnnEventSelector {
protected:
	DnnPtrExtractor	PtrExtractor;
	int	TblSize;
	CcuHashTableOf<DnnTrigger>	*Triggers;
public:
		DnnEventPtrSelector (DnnPtrExtractor, int);
		~DnnEventPtrSelector ();
	DnnTrigger*	UseTrigger (void*);
	void	UnuseTrigger (void*, DnnBaseReaction*);
	DnnTrigger*	FindTrigger (DnnEvent*);
};


#endif	/* DnnSource_H_ */