public StatsMatcher(String filename) {
   try {
     Item stats = SSE.readFile(filename);
     if (stats.isNil()) {
       Log.warn(this, "Empty stats file: " + filename);
       return;
     }
     if (!stats.isTagged(STATS)) throw new ARQException("Not a stats file: " + filename);
     init(stats);
   } catch (ItemException ex) { // Debug
     throw ex;
   }
 }