code: @Override
      public WSStatistic getStatistic(int dataId) {
          ArrayList members = copyStatistics();
          if (members == null || members.size() <= 0)
              return null;
  
          int sz = members.size();
          for (int i = 0; i < sz; i++) {
              StatisticImpl data = (StatisticImpl) members.get(i);
              if (data != null && data.getId() == dataId) {
                  return data;
              }
          }
          return null;
      }
docs: get Statistic by data id