1using Gorilla.Commons.Utility;
 2
 3namespace presentation.windows.server.domain.payroll
 4{
 5    public class Vest
 6    {
 7        Fraction portion;
 8        Date vesting_date;
 9
10        public Vest(Fraction portion, Date vesting_date)
11        {
12            this.portion = portion;
13            this.vesting_date = vesting_date;
14        }
15
16        public Units unvested_units(Units total_units, Date date)
17        {
18            return expires_before(date) ? Units.Empty : total_units.reduced_by(portion);
19        }
20
21        bool expires_before(Date date)
22        {
23            return vesting_date.is_before(date);
24        }
25    }
26}