/**
  * Get formatted value maps.
  *
  * @return array
  */
 protected function getFormattedValueMaps()
 {
     if (!isset($this->formattedData['valueMaps'])) {
         $this->formattedData['valueMaps'] = $this->adapter->getValueMaps();
     }
     return $this->formattedData['valueMaps'];
 }