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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 DnnTrigger_H_
#define DnnTrigger_H_
#include "cplus_bugs.h"
#include "ccu/List.h"
#include "ccu/bool.h"
class DnnEvent;
class DnnBaseCriterion;
class DnnTrigger {
friend class DnnBaseReaction;
public:
enum REL_PRIORITY { isFirstPriority, isNormalPriority, isLastPriority };
private:
DnnTrigger (const DnnTrigger&);
DnnTrigger& operator = (const DnnTrigger&);
protected:
CcuListOf <DnnBaseReaction> FirstSubscribers;
CcuListOf <DnnBaseReaction> Subscribers;
CcuListOf <DnnBaseReaction> LastSubscribers;
CcuListOf <DnnBaseReaction> Grabs;
CcuListOf <DnnBaseCriterion> Criteria;
void Subscribe (DnnBaseReaction&, REL_PRIORITY);
void Unsubscribe (DnnBaseReaction&);
void Grab (DnnBaseReaction&);
void Release (DnnBaseReaction&);
public:
DnnTrigger ();
~DnnTrigger ();
inline bool IsUnused () const { return bool (Subscribers.IsEmpty () && FirstSubscribers.IsEmpty () && LastSubscribers.IsEmpty ()); }
void Dispatch (DnnEvent&);
bool Check (DnnEvent&);
inline void AddCriterion (DnnBaseCriterion& c) { Criteria.Append (&c); }
inline void RemoveCriterion (DnnBaseCriterion& c) { Criteria.Remove (&c); }
};
#endif /* DnnTrigger_H_ */
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