Method RequestData

IO/XML/vtkXMLCompositeDataWriter.cxx:160–234

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

//------------------------------------------------------------------------------
int vtkXMLCompositeDataWriter::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector*)
{
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);

  this->InputInformation = inInfo;

  vtkCompositeDataSet* compositeData =
    vtkCompositeDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  if (!compositeData)
  {
    vtkErrorMacro("No hierarchical input has been provided. Cannot write");
    this->InputInformation = nullptr;
    return 0;
  }

  // Create writers for each input.
  this->CreateWriters(compositeData);

  this->SetErrorCode(vtkErrorCode::NoError);

  // Make sure we have a file to write.
  if (!this->Stream && !this->FileName)
  {
    vtkErrorMacro("Writer called with no FileName set.");
    this->SetErrorCode(vtkErrorCode::NoFileNameError);
    this->InputInformation = nullptr;
    return 0;
  }

  // We are just starting to write.  Do not call
  // UpdateProgressDiscrete because we want a 0 progress callback the
  // first time.
  this->UpdateProgress(0);

  // Initialize progress range to entire 0..1 range.
  float wholeProgressRange[2] = { 0.f, 1.f };
  this->SetProgressRange(wholeProgressRange, 0, 1);

  // Prepare file prefix for creation of internal file names.
  this->SplitFileName();

  float progressRange[2] = { 0.f, 0.f };
  this->GetProgressRange(progressRange);

  // Create the subdirectory for the internal files.
  std::string subdir = this->Internal->FilePath;
  subdir += this->Internal->FilePrefix;
  this->MakeDirectory(subdir.c_str());

  this->Internal->Root = vtkSmartPointer<vtkXMLDataElement>::New();
  this->Internal->Root->SetName(compositeData->GetClassName());

  int writerIdx = 0;
  if (!this->WriteComposite(compositeData, this->Internal->Root, writerIdx))
  {
    this->RemoveWrittenFiles(subdir.c_str());
    return 0;