protected function getWrapperArgs(): string
  {
    $ret = '';

    if ($this->routine['designation']=='bulk')
    {
      $ret .= 'BulkHandler $bulkHandler';
    }

    foreach ($this->routine['parameters'] as $i => $parameter)
    {
      if ($ret!='') $ret .= ', ';

      $dataType    = DataTypeHelper::columnTypeToPhpTypeHinting($parameter);
      $declaration = DataTypeHelper::phpTypeHintingToPhpTypeDeclaration($dataType.'|null');
      if ($declaration!=='')
      {
        $ret .= $declaration.' ';
      }

      $ret .= '$'.$this->nameMangler->getParameterName($parameter['parameter_name']);
    }

    return $ret;
  }