private static @NotNull Object2IntMap<HighlightSeverity> fromList(@NotNull List<? extends HighlightSeverity> orderList) {
    if (orderList.isEmpty()) {
      return Object2IntMaps.emptyMap();
    }

    Object2IntMap<HighlightSeverity> map = new Object2IntOpenHashMap<>(orderList.size());
    map.defaultReturnValue(-1);
    for (int index = 0; index < orderList.size(); index++) {
      HighlightSeverity severity = orderList.get(index);
      map.put(severity, index);
    }
    if (map.size() != orderList.size()) {
      Logger.getInstance(SeverityRegistrar.class).error("Severities order list must contain unique severities but got: " + orderList);
    }
    return Object2IntMaps.unmodifiable(map);
  }
private static @NotNull Object2IntMap<HighlightSeverity> fromList(@NotNull List<? extends HighlightSeverity> orderList)