/**
  * @param DocumentationEntity
  *
  * @return DocumentationEntity
  */
 public function getStableVersion(DocumentationEntity $entity)
 {
     foreach ($this->getEntities() as $check) {
         if ($check->getKey() == $entity->getKey()) {
             if ($check->getLanguage() == $entity->getLanguage()) {
                 if ($check->getIsStable()) {
                     return $check;
                 }
             }
         }
     }
     return $entity;
 }