CrontabEntry.java 文件源码

private String fieldToString(RangeSet<Integer> rangeSet, Range<Integer> coveringRange) {
  if (rangeSet.asRanges().size() == 1 && rangeSet.encloses(coveringRange)) {
    return "*";
  }
  List<String> components = Lists.newArrayList();
  for (Range<Integer> range : rangeSet.asRanges()) {
    ContiguousSet<Integer> set = ContiguousSet.create(range, DiscreteDomain.integers());
    if (set.size() == 1) {
      components.add(set.first().toString());
    } else {
      components.add(set.first() + "-" + set.last());
    }
  }
  return String.join(",", components);
}