code: public boolean isExceeded() {
          lastAggregatedValue = getAggregatedValue();
          lastExceededValue = false;
          switch (operator) {
              case lessThan:
                  lastExceededValue = (lastAggregatedValue < thresholdValue);
                  break;
              case greaterThan: lastExceededValue = (lastAggregatedValue > thresholdValue);
                  break;
          }
          return lastExceededValue;
      }
docs: Returns true of this threshold has been exceeded.
  
  @return true if exceeded