vtkXMLCompositeDataReader.h

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/*=========================================================================
 
  Program:   ParaView
  Module:    vtkXMLCompositeDataReader.h
 
  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html 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 vtkXMLCompositeDataReader_h
#define vtkXMLCompositeDataReader_h
 
#include "vtkIOXMLModule.h" // For export macro
#include "vtkXMLReader.h"
 
class vtkCompositeDataSet;
class vtkInformationIntegerKey;
class vtkInformationIntegerVectorKey;
struct vtkXMLCompositeDataReaderInternals;
 
#include <set>    // for std::set
#include <string> // for std::string
 
class VTKIOXML_EXPORT vtkXMLCompositeDataReader : public vtkXMLReader
{
public:
  vtkTypeMacro(vtkXMLCompositeDataReader, vtkXMLReader);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  enum
  {
    Block,
    Interleave
  };
 
  vtkSetClampMacro(PieceDistribution, int, Block, Interleave);
  vtkGetMacro(PieceDistribution, int);
 
  vtkCompositeDataSet* GetOutput();
  vtkCompositeDataSet* GetOutput(int);
 
  void SetFileName(VTK_FILEPATH const char*) override;
 
protected:
  vtkXMLCompositeDataReader();
  ~vtkXMLCompositeDataReader() override;
 
  // Get the name of the data set being read.
  const char* GetDataSetName() override;
 
  // Returns the primary element pass to ReadPrimaryElement().
  vtkXMLDataElement* GetPrimaryElement();
 
  void ReadXMLData() override;
  int ReadPrimaryElement(vtkXMLDataElement* ePrimary) override;
 
  // Setup the output with no data available.  Used in error cases.
  void SetupEmptyOutput() override;
 
  int FillOutputPortInformation(int, vtkInformation* info) override;
 
  // Create a default executive.
  vtkExecutive* CreateDefaultExecutive() override;
 
  // Find the path to this file in case the internal files are
  // specified as relative paths.
  std::string GetFilePath();
 
  std::string GetFileNameFromXML(vtkXMLDataElement* xmlElem, const std::string& filePath);
 
  vtkXMLReader* GetReaderOfType(const char* type);
  vtkXMLReader* GetReaderForFile(const std::string& filename);
 
  int RequestInformation(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
 
  void SyncDataArraySelections(
    vtkXMLReader* accum, vtkXMLDataElement* xmlElem, const std::string& filePath);
 
  // Adds a child data object to the composite parent. childXML is the XML for
  // the child data object need to obtain certain meta-data about the child.
  void AddChild(vtkCompositeDataSet* parent, vtkDataObject* child, vtkXMLDataElement* childXML);
 
  // Read the XML element for the subtree of a the composite dataset.
  // dataSetIndex is used to rank the leaf nodes in an inorder traversal.
  virtual void ReadComposite(vtkXMLDataElement* element, vtkCompositeDataSet* composite,
    const char* filePath, unsigned int& dataSetIndex) = 0;
 
  // Read the vtkDataSet (a leaf) in the composite dataset.
  virtual vtkDataSet* ReadDataset(vtkXMLDataElement* xmlElem, const char* filePath);
 
  // Read the vtkDataObject (a leaf) in the composite dataset.
  virtual vtkDataObject* ReadDataObject(vtkXMLDataElement* xmlElem, const char* filePath);
 
  int ShouldReadDataSet(
    unsigned int datasetIndex, unsigned int pieceIndex = 0, unsigned int numPieces = 0);
 
#ifndef __VTK_WRAP__
  static unsigned int CountNestedElements(vtkXMLDataElement* element, const std::string& tagName,
    const std::set<std::string>& exclusions = std::set<std::string>());
#endif
private:
  vtkXMLCompositeDataReader(const vtkXMLCompositeDataReader&) = delete;
  void operator=(const vtkXMLCompositeDataReader&) = delete;
 
 
  static int GetPieceAssignmentForBlockStrategy(
    unsigned int datasetIndex, unsigned int numDatasets, int numPieces);
  static int GetPieceAssignmentForInterleaveStrategy(
    unsigned int datasetIndex, unsigned int numDatasets, int numPieces);
 
  int PieceDistribution;
 
  vtkXMLCompositeDataReaderInternals* Internal;
};
 
#endif