Method CreateOutput

IO/Legacy/vtkGenericDataObjectReader.cxx:95–173

vtkGenericDataObjectReader::~vtkGenericDataObjectReader() = default;

vtkDataObject* vtkGenericDataObjectReader::CreateOutput(vtkDataObject* currentOutput)
{
  if (this->GetFileName() == nullptr &&
    (this->GetReadFromInputString() == 0 ||
      (this->GetInputArray() == nullptr && this->GetInputString() == nullptr)))
  {
    vtkWarningMacro(<< "FileName must be set");
    return nullptr;
  }

  int outputType = this->ReadOutputType();

  if (currentOutput && (currentOutput->GetDataObjectType() == outputType))
  {
    return currentOutput;
  }

  vtkDataObject* output = nullptr;
  switch (outputType)
  {
    case VTK_DIRECTED_GRAPH:
      output = vtkDirectedGraph::New();
      break;
    case VTK_MOLECULE:
    case VTK_UNDIRECTED_GRAPH:
      output = vtkUndirectedGraph::New();
      break;
    case VTK_IMAGE_DATA:
      output = vtkImageData::New();
      break;
    case VTK_POLY_DATA:
      output = vtkPolyData::New();
      break;
    case VTK_RECTILINEAR_GRID:
      output = vtkRectilinearGrid::New();
      break;
    case VTK_STATISTICAL_MODEL:
      output = vtkStatisticalModel::New();
      break;
    case VTK_STRUCTURED_GRID:
      output = vtkStructuredGrid::New();
      break;
    case VTK_STRUCTURED_POINTS:
      output = vtkStructuredPoints::New();
      break;
    case VTK_TABLE:
      output = vtkTable::New();
      break;
    case VTK_TREE:
      output = vtkTree::New();
      break;
    case VTK_UNSTRUCTURED_GRID:
      output = vtkUnstructuredGrid::New();
      break;
    case VTK_MULTIBLOCK_DATA_SET:
      output = vtkMultiBlockDataSet::New();
      break;
    case VTK_MULTIPIECE_DATA_SET: