code: private static void addFiltersAndValuesToIndex(BufferedReader br, PackageIndex<Integer> packageIndex) throws IOException {
          String line;
          while ((line = br.readLine()) != null) {
              if (line.isEmpty() || line.startsWith("#")) {
                  continue;
              }
              int pos = line.indexOf('=');
              if (pos > 0) {
                  String filter = line.substring(0, pos).trim();
                  String value = line.substring(pos + 1).trim();
                  packageIndex.add(filter, getMinLevelIndex(value));
              }
          }
      }
docs: /*
  Add the filters and values to the index.
  The values are inserted as Integers for easy comparison in TraceComponent
  and to avoid having to recompute each time the spec is checked.