// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

//#include <Interface_Recognizer.ixx>
#include <Standard_NoSuchObject.hxx>

//  ATTENTION : TransRecognizer a exactement le meme code ...
//  Mais produit un Transient au lieu d un Persistent

// Principe : a un objet de depart (cle), un Recognizer tente d'associer un
// resultat. La classe Recognizer offre le mecanisme general gerant cela
// Chaque classe particuliere (une fois definie l'instanciation) doit fournir
// une methode specifique Eval, qui opere la correspondance
// Eval considere l'objet par tous moyens appropries, et en cas de succes,
// appelle  SetOK(result) puis sort (return)
// en cas d'echec, suite au retour d'Eval, Recognizer sait que SetOK n'a pas
// ete appele

Interface_Recognizer::Interface_Recognizer ()
      {  hasnext = Standard_False;  }
  //thekey.Nullify();  inutile, fait par le constructeur ...

    Standard_Boolean Interface_Recognizer::Evaluate
  (const TheKey& akey, Handle(TheResul)& res)
{
  theres.Nullify();
  Eval(akey);
  if (!theres.IsNull()) {
    res = theres;
    return Standard_True;
  }
  else if (hasnext) return thenext->Evaluate(akey,res);
  return Standard_False;
}

    Handle(TheResul) Interface_Recognizer::Result () const
{
  if (!theres.IsNull()) return theres;
  if (hasnext) return thenext->Result();
  throw Standard_NoSuchObject("Recognizer evaluation has failed");
}

    void Interface_Recognizer::Add (const Handle(Interface_Recognizer)& reco)
      {  thenext = reco;  hasnext = Standard_True;  }

    void Interface_Recognizer::SetOK (const Handle(TheResul)& aresult)
      {  theres = aresult;  }

    void Interface_Recognizer::SetKO ()
      {  theres.Nullify();  }