Method RequestData

Infovis/BoostGraphAlgorithms/vtkBoostSplitTableField.cxx:93–166

}

int vtkBoostSplitTableField::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkTable* const input = vtkTable::GetData(inputVector[0]);
  vtkTable* const output = vtkTable::GetData(outputVector);

  // If the number of fields and delimiters don't match, we're done ...
  if (this->Fields->GetNumberOfValues() != this->Delimiters->GetNumberOfValues())
  {
    vtkErrorMacro("The number of fields and the number of delimiters must match");
    return 0;
  }

  // If no fields were specified, we don't do any splitting - just shallow copy ...
  if (0 == this->Fields->GetNumberOfValues())
  {
    output->ShallowCopy(input);
    return 1;
  }

  // Setup the columns for our output table ...
  for (vtkIdType i = 0; i < input->GetNumberOfColumns(); ++i)
  {
    vtkAbstractArray* const column = input->GetColumn(i);
    vtkAbstractArray* const new_column = vtkAbstractArray::CreateArray(column->GetDataType());
    new_column->SetName(column->GetName());
    new_column->SetNumberOfComponents(column->GetNumberOfComponents());
    output->AddColumn(new_column);
    if (input->GetRowData()->GetPedigreeIds() == column)
    {
      output->GetRowData()->SetPedigreeIds(new_column);
    }
    new_column->Delete();
  }

  // Setup a tokenizer for each column that will be split ...
  implementation::tokenizers_t tokenizers;
  for (vtkIdType column = 0; column < input->GetNumberOfColumns(); ++column)
  {
    tokenizers.push_back(static_cast<implementation::tokenizer_t*>(nullptr));

    for (vtkIdType field = 0; field < this->Fields->GetNumberOfValues(); ++field)
    {
      if (this->Fields->GetValue(field) == input->GetColumn(column)->GetName())
      {
        tokenizers[column] = new implementation::tokenizer_t(
          std::string(), implementation::delimiter_t(this->Delimiters->GetValue(field).c_str()));
        break;
      }
    }
  }

  // Iterate over each row in the input table, generating one-to-many rows in the output table ...
  vtkVariantArray* const output_row = vtkVariantArray::New();
  output_row->SetNumberOfValues(input->GetNumberOfColumns());

  for (vtkIdType i = 0; i < input->GetNumberOfRows(); ++i)
  {