// ZSS-1019
 protected void importAutoFilterColumns(
     AutoFilter poiFilter, SAutoFilter zssFilter, int numberOfColumn) {
   for (int i = 0; i < numberOfColumn; i++) {
     FilterColumn srcColumn = poiFilter.getFilterColumn(i);
     if (srcColumn == null) {
       continue;
     }
     NFilterColumn destColumn = zssFilter.getFilterColumn(i, true);
     destColumn.setProperties(
         PoiEnumConversion.toFilterOperator(srcColumn.getOperator()),
         srcColumn.getCriteria1(),
         srcColumn.getCriteria2(),
         srcColumn.isOn());
   }
 }