/**
  * Get all the PoiTypes in the database.
  *
  * @return A ID,PoiType map with all the PoiTypes.
  */
 public Map<Long, PoiType> loadPoiTypes() {
   List<PoiType> poiTypes = poiTypeDao.queryForAll();
   Map<Long, PoiType> result = new HashMap<>();
   for (PoiType poiType : poiTypes) {
     result.put(poiType.getId(), poiType);
   }
   return result;
 }