vrfObjectPredicate.h

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/*******************************************************************************
** Copyright (c) 2001 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/
#pragma once



#include <vlutil/vlMachineTypes.h>
#include <ostream>

class DtVrfObject;

#include "vrfobjcore/vrfobjcoreDefines.h"
class DT_DLL_vrfobjcore DtVrfObjectPredicate
{
public:

   DtVrfObjectPredicate(bool negate = false);

   virtual ~DtVrfObjectPredicate();

   DtVrfObjectPredicate(const DtVrfObjectPredicate& orig);

   DtVrfObjectPredicate& operator=(const DtVrfObjectPredicate& orig);

   virtual DtVrfObjectPredicate* clone() const = 0;

   bool operator==(const DtVrfObjectPredicate& orig) const;
   bool operator!=(const DtVrfObjectPredicate& orig) const;

   virtual bool negated() const;
   virtual void setNegate(bool negate);

   bool isTrue(const DtVrfObject* vrfObject);

   
   virtual bool canBeTrue(const DtVrfObject* vrfObject);
   virtual bool canBeFalse(const DtVrfObject* vrfObject);

   virtual void stringRep(std::ostream& str, int indentLevel = 0) const;

public:

   static const DtVrfObjectPredicate& nullPredicate();

protected:

   virtual bool eval(const DtVrfObject* vrfObject) = 0;

   virtual bool predicateEqual(const DtVrfObjectPredicate& orig) const;

   virtual bool canEvalTrue(const DtVrfObject* vrfObject) { return true; };
   virtual bool canEvalFalse(const DtVrfObject* vrfObject) { return true; };

   virtual void typeSpecificStringRep(std::ostream& str, int indentLevel) const;

protected:

   bool myNegated;
};