private void generateUnits(SpeedUnit startSpeed, SpeedUnit endSpeed) {
if (!startSpeed.getClass().equals(endSpeed.getClass())) {
endSpeed = (SpeedUnit) Operation.convert(endSpeed, startSpeed.getIdentifier());
}
final int startValue = (int) Math.round(startSpeed.getValue());
final int endValue = (int) Math.round(endSpeed.getValue());
if (startValue > endValue)
throw new IllegalArgumentException(
"Starting value must be less or equal to the ending value.");
unitsList.clear();
for (int i = startValue; i <= endValue; i++) {
unitsList.add((SpeedUnit) startSpeed.valueOf(i));
}
}
@Override
public int getItemIndex(SpeedUnit item) {
SpeedUnit floorItem = (SpeedUnit) item.valueOf(Math.round(item.getValue()));
return unitsList.indexOf(floorItem);
}