/*
 *	DNN - Data News Network
 *
 *	by Stephane Chatty
 *
 *	Copyright 1993-1995
 *	Centre d'Etudes de la Navigation Aerienne (CENA)
 *
 *	Criteria.
 *
 *	$Id$
 *	$CurLog$
 *	Removed pragma interfaces
 */

#ifndef DnnCriterion_H_
#define DnnCriterion_H_

#include "cplus_bugs.h"
#include "ccu/bool.h"
#include "ccu/List.h"
class DnnEvent;

class DnnBaseCriterion {
friend	class	DnnAndCriterion;
friend	class	DnnOrCriterion;
protected:
		DnnBaseCriterion ();
		~DnnBaseCriterion ();
public:
virtual	bool	Test (DnnEvent&) = 0;
};

class DnnOrCriterion;

class DnnAndCriterion : public DnnBaseCriterion {
friend	class	DnnOrCriterion;
protected:
	CcuListOf <DnnBaseCriterion>	Conditions;
	bool	Test (DnnEvent&);
public:
		DnnAndCriterion ();
		~DnnAndCriterion ();
	DnnAndCriterion&	operator &= (DnnBaseCriterion&);
	DnnAndCriterion&	operator &= (DnnOrCriterion&);
	DnnAndCriterion&	operator &= (DnnAndCriterion&);
};

class DnnOrCriterion : public DnnBaseCriterion {
friend	class	DnnAndCriterion;
protected:
	CcuListOf <DnnBaseCriterion>	Alternatives;
	bool	Test (DnnEvent&);
public:
		DnnOrCriterion ();
		~DnnOrCriterion ();
	DnnOrCriterion&	operator |= (DnnBaseCriterion&);
	DnnOrCriterion&	operator |= (DnnOrCriterion&);
	DnnOrCriterion&	operator |= (DnnAndCriterion&);
};

class DnnBasicCriterion : public DnnBaseCriterion {
protected:
	bool  (*Check) (DnnEvent&);
	bool Test (DnnEvent& e);

public:
		DnnBasicCriterion ();
		DnnBasicCriterion (bool  (*c) (DnnEvent&));
		~DnnBasicCriterion ();
inline	void	ChangeCriterion (bool (*c) (DnnEvent&))	{Check = c; }
};

template <class T> class DnnCriterionOf : public DnnBaseCriterion {
protected:
	T&	Object;
	void	(T::*Check)	(DnnEvent&);

public:
		DnnCriterionOf (T& o, void (T::*c) (DnnEvent&)) : DnnBaseCriterion (), Object (o), Check (c)	{}
		~DnnCriterionOf ()	{}
	bool	Test (DnnEvent& ev)	{ return (Object.*Check) (ev); }
};

#define SpecializedCriterion(R,S) \
\
class R : public DnnBaseCriterion { \
\
protected: \
\
    S& Body; \
    bool  (S::*SpecializedCheck) (DnnEvent&); \
\
public: \
\
    R (S& s, bool  (S::*sc) (DnnEvent&)) : DnnBaseCriterion (), Body (s), SpecializedCheck (sc) {} \
   ~R () {} \
\
    bool  Test (DnnEvent& e) { return (Body.*SpecializedCheck) (e); } \
\
};

#endif	/* DnnCriterion_H_ */