docs: @SuppressWarnings("rawtypes")
    public final Map<String, MtasDataItemNumberComparator> getComparatorList()
        throws IOException {
      if (collectorType.equals(DataCollector.COLLECTOR_TYPE_LIST)) {
        LinkedHashMap<String, MtasDataItemNumberComparator> comparatorList = new LinkedHashMap<>();
        for (Entry<String, MtasDataItem<T1, T2>> entry : list.entrySet()) {
          comparatorList.put(entry.getKey(),
              entry.getValue().getComparableValue());
        }
        return comparatorList;
      } else {
        throw new IOException("type " + collectorType + " not supported");
      }
    }