private static List expandSeq()

in spectator-api/src/main/java/com/netflix/spectator/impl/matcher/PatternUtils.java [272:305]

33 lines of code
10 McCabe index (conditional complexity)


  private static List<Matcher> expandSeq(SeqMatcher seqMatcher, int max) {
    List<List<Matcher>> results = new ArrayList<>();
    for (Matcher matcher : seqMatcher.matchers()) {
      if (results.isEmpty()) {
        List<Matcher> rs = expandOrClauses(matcher, max);
        if (rs == null)
          return null;
        for (Matcher m : rs) {
          List<Matcher> tmp = new ArrayList<>();
          tmp.add(m);
          results.add(tmp);
        }
      } else {
        List<Matcher> rs = expandOrClauses(matcher, max);
        if (rs == null || results.size() * rs.size() > max)
          return null;
        List<List<Matcher>> tmp = new ArrayList<>(results.size() * rs.size());
        for (List<Matcher> ms : results) {
          for (Matcher r : rs) {
            List<Matcher> seq = new ArrayList<>(ms);
            seq.add(r);
            tmp.add(seq);
          }
        }
        results = tmp;
      }
    }

    List<Matcher> tmp = new ArrayList<>(results.size());
    for (List<Matcher> ms : results) {
      tmp.add(SeqMatcher.create(ms));
    }
    return tmp;
  }