code: public IntegerRanges getRange(String name) {
      String valueString = get(name);
      Preconditions.checkNotNull(valueString);
      return new IntegerRanges(valueString);
    }
docs: Parse the given attribute as a set of integer ranges.
  @param name the attribute name
  @throws NullPointerException if the configuration property does not exist
  @return a new set of ranges from the configured value