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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>
 #include <NCollection_Array1.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 ~RWMesh_TriangulationSource() override;
 
   //! Returns reader allowing to read data from the buffer.
   const occ::handle<RWMesh_TriangulationReader>& Reader() const { return myReader; }
 
   //! Sets reader allowing to read data from the buffer.
   void SetReader(const occ::handle<RWMesh_TriangulationReader>& theReader) { myReader = theReader; }
 
   //! Returns number of degenerated triangles collected during data reading.
   //! Used for debug statistic purpose.
   int DegeneratedTriNb() const { return myStatisticOfDegeneratedTriNb; }
 
   //! Gets access to number of degenerated triangles to collect them during data reading.
   int& ChangeDegeneratedTriNb() { return myStatisticOfDegeneratedTriNb; }
 
   //! Returns TRUE if triangulation has some geometry.
   bool HasGeometry() const override
   {
     return !myNodes.IsEmpty() && (!myTriangles.IsEmpty() || !myEdges.IsEmpty());
   }
 
   //! Returns the number of edges for this triangulation.
   int NbEdges() const { return myEdges.Length(); }
 
   //! Returns edge at the given index.
   //! @param[in] theIndex edge index within [1, NbEdges()] range
   //! @return edge node indices, with each node defined within [1, NbNodes()] range
   int Edge(int theIndex) const { return myEdges.Value(theIndex); }
 
   //! Sets an edge.
   //! @param[in] theIndex edge index within [1, NbEdges()] range
   //! @param[in] theEdge edge node indices, with each node defined within [1, NbNodes()] range
   void SetEdge(int theIndex, int theEdge) { myEdges.SetValue(theIndex, theEdge); }
 
 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.
   int NbDeferredNodes() const override { return myNbDefNodes; }
 
   //! Sets number of nodes for deferred loading.
   void SetNbDeferredNodes(const int 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.
   int NbDeferredTriangles() const override { return myNbDefTriangles; }
 
   //! Sets number of triangles for deferred loading.
   void SetNbDeferredTriangles(const int theNbTris) { myNbDefTriangles = theNbTris; }
 
   //! Returns an internal array of edges.
   //! Edge()/SetEdge() should be used instead in portable code.
   NCollection_Array1<int>& InternalEdges() { return myEdges; }
 
   //! Method resizing an internal array of triangles.
   //! @param[in] theNbTriangles  new number of triangles
   //! @param[in] theToCopyOld    copy old triangles into the new array
   Standard_EXPORT void ResizeEdges(int theNbEdges, bool theToCopyOld);
 
 protected:
   //! Loads triangulation data from deferred storage using specified shared input file system.
   Standard_EXPORT bool loadDeferredData(
     const occ::handle<OSD_FileSystem>&     theFileSystem,
     const occ::handle<Poly_Triangulation>& theDestTriangulation) const override;
 
 protected:
   occ::handle<RWMesh_TriangulationReader> myReader;
   NCollection_Array1<int>                 myEdges;
   int                                     myNbDefNodes;
   int                                     myNbDefTriangles;
   mutable int                             myStatisticOfDegeneratedTriNb;
 };
 
 #endif // _RWMesh_TriangulationSource_HeaderFile

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