code: private NailStats getOrCreateStatsFor(Class nailClass) {
      NailStats result;
      synchronized (allNailStats) {
        String nailClassName = nailClass.getName();
        result = allNailStats.get(nailClassName);
        if (result == null) {
          result = new NailStats(nailClassName);
          allNailStats.put(nailClassName, result);
        }
      }
      return result;
    }
docs: Returns the current NailStats object for the specified class, creating a new one if necessary
  
  @param nailClass the class for which we're gathering stats
  @return a NailStats object for the specified class