// Created on: 2000-03-01
// Created by: Denis PASCAL
// Copyright (c) 2000-2014 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.

#ifndef _TDF_Reference_HeaderFile
#define _TDF_Reference_HeaderFile

#include <Standard.hxx>
#include <Standard_Type.hxx>

#include <TDF_Label.hxx>
#include <TDF_Attribute.hxx>
#include <Standard_OStream.hxx>
class Standard_GUID;
class TDF_Label;
class TDF_Attribute;
class TDF_RelocationTable;
class TDF_DataSet;


class TDF_Reference;
DEFINE_STANDARD_HANDLE(TDF_Reference, TDF_Attribute)

//! This  attribute is  used to  store in the  framework a
//! reference to an other label.
class TDF_Reference : public TDF_Attribute
{

public:

  
  Standard_EXPORT static const Standard_GUID& GetID();
  
  Standard_EXPORT static Handle(TDF_Reference) Set (const TDF_Label& I, const TDF_Label& Origin);
  
  Standard_EXPORT void Set (const TDF_Label& Origin);
  
  Standard_EXPORT TDF_Label Get() const;
  
  Standard_EXPORT const Standard_GUID& ID() const Standard_OVERRIDE;
  
  Standard_EXPORT void Restore (const Handle(TDF_Attribute)& With) Standard_OVERRIDE;
  
  Standard_EXPORT Handle(TDF_Attribute) NewEmpty() const Standard_OVERRIDE;
  
  Standard_EXPORT void Paste (const Handle(TDF_Attribute)& Into, const Handle(TDF_RelocationTable)& RT) const Standard_OVERRIDE;
  
  Standard_EXPORT virtual void References (const Handle(TDF_DataSet)& DS) const Standard_OVERRIDE;
  
  Standard_EXPORT virtual Standard_OStream& Dump (Standard_OStream& anOS) const Standard_OVERRIDE;
  
  Standard_EXPORT TDF_Reference();




  DEFINE_STANDARD_RTTIEXT(TDF_Reference,TDF_Attribute)

protected:




private:


  TDF_Label myOrigin;


};







#endif // _TDF_Reference_HeaderFile