docs: public static List<Integer> parseStringToIntegerList(String source,
                                                           String token) {
  
          if (StringUtils.isBlank(source) || StringUtils.isEmpty(token)) {
              return null;
          }
  
          List<Integer> result = new ArrayList<Integer>();
          String[] units = source.split(token);
          for (String unit : units) {
              result.add(Integer.valueOf(unit));
          }
  
          return result;
      }