Method RequestData

IO/Infovis/vtkXMLTreeReader.cxx:160–294

}

int vtkXMLTreeReader::RequestData(
  vtkInformation*, vtkInformationVector**, vtkInformationVector* outputVector)
{
  if (!this->FileName && !this->XMLString)
  {
    vtkErrorMacro("A FileName or XMLString must be specified");
    return 0;
  }

  xmlDoc* doc = nullptr;
  if (this->FileName)
  {
    // Parse the file and get the DOM
    doc = xmlReadFile(this->FileName, nullptr, 0);
  }
  else if (this->XMLString)
  {
    // Parse from memory and get the DOM
    doc = xmlReadMemory(
      this->XMLString, static_cast<int>(strlen(this->XMLString)), "noname.xml", nullptr, 0);
  }

  // Store the XML hierarchy into a vtkMutableDirectedGraph,
  // later to be placed in a vtkTree.
  vtkSmartPointer<vtkMutableDirectedGraph> builder =
    vtkSmartPointer<vtkMutableDirectedGraph>::New();

  vtkDataSetAttributes* data = builder->GetVertexData();

  if (this->ReadTagName)
  {
    vtkStringArray* nameArr = vtkStringArray::New();
    nameArr->SetName(vtkXMLTreeReader::TagNameField);
    data->AddArray(nameArr);
    nameArr->Delete();
  }

  if (this->ReadCharData)
  {
    vtkStringArray* charArr = vtkStringArray::New();
    charArr->SetName(vtkXMLTreeReader::CharDataField);
    data->AddArray(charArr);
    charArr->Delete();
  }

  // Get the root element node
  xmlNode* rootElement = xmlDocGetRootElement(doc);
  if (!rootElement)
  {
    vtkErrorMacro(<< "Could not get root element of document.");
    return 0;
  }

  vtkXMLTreeReaderProcessElement(builder, -1, rootElement, this->ReadCharData, this->MaskArrays);

  xmlFreeDoc(doc);

  // Make all the arrays the same size