code: public List<String> getProperties() {
  		List<String> properties = null;
  		if (has()) {
  			properties = getDao().querySingleColumnTypedResults(
  					"SELECT DISTINCT " + COLUMN_PROPERTY + " FROM "
  							+ TABLE_NAME, null);
  		} else {
  			properties = new ArrayList<>();
  		}
  		return properties;
  	}
docs: Get the properties
  
  @return list of properties