code: private Match matchImpl(List<Entry> desiredLocales, int threshold) {
      int bestDistance = MAX_DISTANCE;
      Entry bestMatch = null;
      for (Entry desired : desiredLocales) {
        List<String> exact = exactMatch.get(desired.locale);
        if (exact != null) {
          return new Match(exact.get(0), 0);
        }
        for (Entry supported : supportedLocales) {
          int distance = DISTANCE_TABLE.distance(desired.locale, supported.locale, threshold);
          if (distance < bestDistance) {
            bestDistance = distance;
            bestMatch = supported;
          }
        }
      }
      return bestMatch == null 
          ? new Match(firstEntry.bundleId, MAX_DISTANCE)
          : new Match(bestMatch.bundleId, bestDistance);
    }
docs: Return the best match that exceeds the threshold, or the default.
  If the default is returned its distance is set to MAX_DISTANCE.
  An exact match has distance of 0.