int itemCount = dataset.getItemCount(series);
for (int item = 0; item < itemCount; item++) {
double lvalue;
double uvalue;
if (dataset instanceof IntervalXYDataset) {
IntervalXYDataset intervalXYData = (IntervalXYDataset) dataset;
lvalue = intervalXYData.getStartYValue(series, item);
uvalue = intervalXYData.getEndYValue(series, item);
}
else if (dataset instanceof OHLCDataset) {
OHLCDataset highLowData = (OHLCDataset) dataset;
lvalue = highLowData.getLowValue(series, item);
uvalue = highLowData.getHighValue(series, item);