public class UDFExample {
public static Integer fact( Integer x ) {
if (x == null)
return null;
int x_t = x.intValue();
if (x_t < 0)
return new Integer(0);
int factResult = 1;
while (x_t > 1) {
factResult = factResult * x_t;
x_t = x_t - 1;
}
return new Integer(factResult);
}
}