Method RequestDataObject

IO/XML/vtkXMLGenericDataObjectReader.cxx:216–288

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//------------------------------------------------------------------------------
int vtkXMLGenericDataObjectReader::RequestDataObject(
  vtkInformation* request, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  if (!this->Stream && !this->FileName)
  {
    vtkErrorMacro("File name not specified");
    return 0;
  }

  if (this->Reader != nullptr)
  {
    if (auto observer = this->GetReaderErrorObserver())
    {
      this->Reader->RemoveObserver(observer);
    }
    if (auto observer = this->GetParserErrorObserver())
    {
      this->Reader->RemoveObserver(observer);
    }
    this->Reader->Delete();
    this->Reader = nullptr;
  }

  vtkDataObject* output = nullptr;

  // Create reader.
  bool parallel = false;
  auto data_type = this->ReadOutputType(this->FileName, parallel);
  if (auto reader = vtkXMLGenericDataObjectReader::CreateReader(data_type, parallel))
  {
    output = vtkDataObjectTypes::NewDataObject(data_type);
    this->Reader = reader;
    this->Reader->Register(this);
  }
  else
  {
    this->Reader = nullptr;
  }

  if (this->Reader != nullptr)
  {
    this->Reader->SetFileName(this->GetFileName());
    //    this->Reader->SetStream(this->GetStream());
    // Delegate the error observers
    if (this->GetReaderErrorObserver())
    {
      this->Reader->AddObserver(vtkCommand::ErrorEvent, this->GetReaderErrorObserver());
    }
    if (this->GetParserErrorObserver())
    {
      this->Reader->SetParserErrorObserver(this->GetParserErrorObserver());
    }
    // Delegate call. RequestDataObject() would be more appropriate but it is
    // protected.
    int result = this->Reader->ProcessRequest(request, inputVector, outputVector);
    if (result)
    {
      vtkInformation* outInfo = outputVector->GetInformationObject(0);