/**
  * Processes the row data
  *
  * @param array $row
  *
  * @return array
  */
 protected function transformRow($row, ColumnTransformerCollection $transformers)
 {
     foreach ($row as $field => $value) {
         if ($transformers->has($field)) {
             $row[$field] = $transformers->get($field)->transformValue($value);
         }
     }
     return $row;
 }