// Copyright (c) 1999-2012 OPEN CASCADE SAS
//
// The content of this file is subject to the Open CASCADE Technology Public
// License Version 6.5 (the "License"). You may not use the content of this file
// except in compliance with the License. Please obtain a copy of the License
// at http://www.opencascade.org and read it completely before using this file.
//
// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
//
// The Original Code and all software distributed under the License is
// distributed on an "AS IS" basis, without warranty of any kind, and the
// Initial Developer hereby disclaims all such warranties, including without
// limitation, any warranties of merchantability, fitness for a particular
// purpose or non-infringement. Please see the License for the specific terms
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//#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();
  Standard_NoSuchObject::Raise ("Recognizer evaluation has failed");
  return theres;  // pour calmer le compilateur
}

    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();  }