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 // Copyright (c) 2021 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 _RWMesh_TriangulationSource_HeaderFile
 #define _RWMesh_TriangulationSource_HeaderFile
 
 #include <Poly_Triangulation.hxx>
 
 class RWMesh_TriangulationReader;
 
 //! Mesh data wrapper for delayed triangulation loading.
 //! Class inherits Poly_Triangulation so that it can be put temporarily into TopoDS_Face within assembly structure.
 class RWMesh_TriangulationSource : public Poly_Triangulation
 {
   DEFINE_STANDARD_RTTIEXT(RWMesh_TriangulationSource, Poly_Triangulation)
 public:
 
   //! Constructor.
   Standard_EXPORT RWMesh_TriangulationSource();
 
   //! Destructor.
   Standard_EXPORT virtual ~RWMesh_TriangulationSource();
 
   //! Returns reader allowing to read data from the buffer.
   const Handle(RWMesh_TriangulationReader)& Reader() const { return myReader; }
 
   //! Sets reader allowing to read data from the buffer.
   void SetReader (const Handle(RWMesh_TriangulationReader)& theReader) { myReader = theReader; }
 
   //! Returns number of degenerated triangles collected during data reading.
   //! Used for debug statistic purpose.
   Standard_Integer DegeneratedTriNb() const { return myStatisticOfDegeneratedTriNb; }
 
   //! Gets access to number of degenerated triangles to collect them during data reading.
   Standard_Integer& ChangeDegeneratedTriNb() { return myStatisticOfDegeneratedTriNb; }
 
 public: //! @name late-load deferred data interface
 
   //! Returns number of nodes for deferred loading.
   //! Note: this is estimated values defined in object header, which might be different from actually loaded values
   //! (due to broken header or extra mesh processing).
   //! Always check triangulation size of actually loaded data in code to avoid out-of-range issues.
   virtual Standard_Integer NbDeferredNodes() const Standard_OVERRIDE { return myNbDefNodes; }
 
   //! Sets number of nodes for deferred loading.
   void SetNbDeferredNodes (const Standard_Integer theNbNodes) { myNbDefNodes = theNbNodes; }
 
   //! Returns number of triangles for deferred loading.
   //! Note: this is estimated values defined in object header, which might be different from actually loaded values
   //! (due to broken header or extra mesh processing).
   //! Always check triangulation size of actually loaded data in code to avoid out-of-range issues.
   virtual Standard_Integer NbDeferredTriangles() const Standard_OVERRIDE { return myNbDefTriangles; }
 
   //! Sets number of triangles for deferred loading.
   void SetNbDeferredTriangles (const Standard_Integer theNbTris) { myNbDefTriangles = theNbTris; }
 
 protected:
 
   //! Loads triangulation data from deferred storage using specified shared input file system.
   Standard_EXPORT virtual Standard_Boolean loadDeferredData (const Handle(OSD_FileSystem)& theFileSystem,
                                                              const Handle(Poly_Triangulation)& theDestTriangulation) const Standard_OVERRIDE;
 
 protected:
 
   Handle(RWMesh_TriangulationReader) myReader;
   Standard_Integer                   myNbDefNodes;
   Standard_Integer                   myNbDefTriangles;
   mutable Standard_Integer           myStatisticOfDegeneratedTriNb;
 
 };
 
 #endif // _RWMesh_TriangulationSource_HeaderFile

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