Method RequestDataObject

IO/Parallel/vtkPDataSetReader.cxx:106–186

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkPDataSetReader::RequestDataObject(
  vtkInformation* request, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{

  istream* file;
  char* block;
  char* param;
  char* value;
  int type;

  // Start reading the meta-data pvtk file.
  file = this->OpenFile(this->FileName);
  if (file == nullptr)
  {
    return 0;
  }

  type = this->ReadXML(file, &block, &param, &value);
  if (type == 1 && strcmp(block, "File") == 0)
  {
    this->ReadPVTKFileInformation(file, request, inputVector, outputVector);
    this->VTKFileFlag = 0;
  }
  else if (type == 4 && strncmp(value, "# vtk DataFile Version", 22) == 0)
  {
    // This is a vtk file not a PVTK file.
    this->ReadVTKFileInformation(request, inputVector, outputVector);
    this->VTKFileFlag = 1;
  }
  else
  {
    vtkErrorMacro("This does not look like a VTK file: " << this->FileName);
  }

  delete file;
  file = nullptr;

  vtkInformation* info = outputVector->GetInformationObject(0);
  vtkDataSet* output = vtkDataSet::SafeDownCast(info->Get(vtkDataObject::DATA_OBJECT()));

  if (output && output->GetDataObjectType() == this->DataType)
  {
    return 1;
  }

  vtkDataSet* newOutput = nullptr;
  switch (this->DataType)
  {
    case VTK_POLY_DATA:
      newOutput = vtkPolyData::New();
      break;
    case VTK_UNSTRUCTURED_GRID:
      newOutput = vtkUnstructuredGrid::New();
      break;
    case VTK_STRUCTURED_GRID:
      newOutput = vtkStructuredGrid::New();
      break;
    case VTK_RECTILINEAR_GRID: