/**
  * Adds the change order count fields to the current total change order count fields. Serves as
  * the accumulator for the total of all change orders in an artifact identifier.
  *
  * @param tco total change order, fields incremented by change order values
  * @param coc change order count to add to total
  */
 private void addToTotalChangeOrder(TotalChangeOrders tco, ChangeOrderCount coc) {
   if (coc == null) return;
   tco.setBrokenLines(tco.getBrokenLines() + coc.getBrokenLines());
   tco.setFixedLines(tco.getFixedLines() + coc.getFixedLines());
   tco.setRepairEffort(tco.getRepairEffort() + coc.getRepairEffort());
   tco.setValue(tco.getValue() + coc.getValue());
 }