vtkXMLUnstructuredDataReader.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkXMLUnstructuredDataReader.h
 
  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
 
     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.
 
=========================================================================*/
#ifndef vtkXMLUnstructuredDataReader_h
#define vtkXMLUnstructuredDataReader_h
 
#include "vtkIOXMLModule.h" // For export macro
#include "vtkXMLDataReader.h"
 
class vtkCellArray;
class vtkIdTypeArray;
class vtkPointSet;
class vtkUnsignedCharArray;
 
class VTKIOXML_EXPORT vtkXMLUnstructuredDataReader : public vtkXMLDataReader
{
public:
  vtkTypeMacro(vtkXMLUnstructuredDataReader, vtkXMLDataReader);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  vtkIdType GetNumberOfPoints() override;
 
  vtkIdType GetNumberOfCells() override;
 
  virtual vtkIdType GetNumberOfPieces();
 
  void SetupUpdateExtent(int piece, int numberOfPieces, int ghostLevel);
 
  // For the specified port, copy the information this reader sets up in
  // SetupOutputInformation to outInfo
  void CopyOutputInformation(vtkInformation* outInfo, int port) override;
 
protected:
  vtkXMLUnstructuredDataReader();
  ~vtkXMLUnstructuredDataReader() override;
 
  vtkPointSet* GetOutputAsPointSet();
  vtkXMLDataElement* FindDataArrayWithName(vtkXMLDataElement* eParent, const char* name);
 
  // note that these decref the input array and return an array with a
  // new reference:
  vtkIdTypeArray* ConvertToIdTypeArray(vtkDataArray* a);
  vtkUnsignedCharArray* ConvertToUnsignedCharArray(vtkDataArray* a);
 
  // Pipeline execute data driver.  Called by vtkXMLReader.
  void ReadXMLData() override;
 
  void SetupEmptyOutput() override;
  virtual void GetOutputUpdateExtent(int& piece, int& numberOfPieces, int& ghostLevel) = 0;
  virtual void SetupOutputTotals();
  virtual void SetupNextPiece();
  void SetupPieces(int numPieces) override;
  void DestroyPieces() override;
 
  // Setup the output's information.
  void SetupOutputInformation(vtkInformation* outInfo) override;
 
  void SetupOutputData() override;
  int ReadPiece(vtkXMLDataElement* ePiece) override;
  int ReadPieceData() override;
  int ReadCellArray(vtkIdType numberOfCells, vtkIdType totalNumberOfCells,
    vtkXMLDataElement* eCells, vtkCellArray* outCells);
 
  // Read faces and faceoffsets arrays for unstructured grid with polyhedon cells
  int ReadFaceArray(vtkIdType numberOfCells, vtkXMLDataElement* eCells, vtkIdTypeArray* outFaces,
    vtkIdTypeArray* outFaceOffsets);
 
  // Read a data array whose tuples coorrespond to points.
  int ReadArrayForPoints(vtkXMLDataElement* da, vtkAbstractArray* outArray) override;
 
  // Get the number of points/cells in the given piece.  Valid after
  // UpdateInformation.
  virtual vtkIdType GetNumberOfPointsInPiece(int piece);
  virtual vtkIdType GetNumberOfCellsInPiece(int piece) = 0;
 
  // The update request.
  int UpdatePieceId;
  int UpdateNumberOfPieces;
  int UpdateGhostLevel;
 
  // The range of pieces from the file that will form the UpdatePiece.
  int StartPiece;
  int EndPiece;
  vtkIdType TotalNumberOfPoints;
  vtkIdType TotalNumberOfCells;
  vtkIdType StartPoint;
 
  // The Points element for each piece.
  vtkXMLDataElement** PointElements;
  vtkIdType* NumberOfPoints;
 
  int PointsTimeStep;
  unsigned long PointsOffset;
  int PointsNeedToReadTimeStep(vtkXMLDataElement* eNested);
  int CellsNeedToReadTimeStep(
    vtkXMLDataElement* eNested, int& cellstimestep, unsigned long& cellsoffset);
 
private:
  vtkXMLUnstructuredDataReader(const vtkXMLUnstructuredDataReader&) = delete;
  void operator=(const vtkXMLUnstructuredDataReader&) = delete;
};
 
#endif