code: protected Priority getPriority(final int lines) {
          if (lines >= highThreshold) {
              return Priority.HIGH;
          }
          else if (lines >= normalThreshold) {
              return Priority.NORMAL;
          }
          else {
              return Priority.LOW;
          }
      }
docs: Returns the priority of the warning.
  
  @param lines
  number of duplicate lines
  @return the priority of the warning