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/*
* DNN - Data News Network
*
* by Stephane Chatty
*
* Copyright 1993-1995
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* Event triggers.
*
* $Id$
* $CurLog$
*/
#ifndef IvlTrigger_H_
#define IvlTrigger_H_
#include "cplus_bugs.h"
#include "ivl/List.h"
#include "ivl/bool.h"
class IvlEvent;
class IvlBaseCriterion;
class IvlTrigger {
friend class IvlBaseReaction;
public:
enum REL_PRIORITY { isFirstPriority, isNormalPriority, isLastPriority };
private:
IvlTrigger (const IvlTrigger&);
IvlTrigger& operator = (const IvlTrigger&);
protected:
IvlListOf <IvlBaseReaction> FirstSubscribers;
IvlListOf <IvlBaseReaction> Subscribers;
IvlListOf <IvlBaseReaction> LastSubscribers;
IvlListOf <IvlBaseReaction> Grabs;
IvlListOf <IvlBaseCriterion> Criteria;
void Subscribe (IvlBaseReaction&, REL_PRIORITY);
void Unsubscribe (IvlBaseReaction&);
void Grab (IvlBaseReaction&);
void Release (IvlBaseReaction&);
public:
IvlTrigger ();
~IvlTrigger ();
inline bool IsUnused () const { return bool (Subscribers.IsEmpty () && FirstSubscribers.IsEmpty () && LastSubscribers.IsEmpty ()); }
void Dispatch (IvlEvent&);
bool Check (IvlEvent&);
inline void AddCriterion (IvlBaseCriterion& c) { Criteria.Append (&c); }
inline void RemoveCriterion (IvlBaseCriterion& c) { Criteria.Remove (&c); }
};
#endif /* IvlTrigger_H_ */
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