* @return a random Castor recurringDuration.
*/
public static RecurringDuration getRandom(RecurringDuration recurring, Class c) {
short randShort;
long randLong = _rand.nextLong();
TimeDuration randDuration = new TimeDuration(randLong);
RecurringDuration result = new RecurringDuration(randDuration, randDuration);
short[] values = new short[10];
//only positive values are allowed
//century
randShort = (short) _rand.nextInt(99);