1using System.Collections.Generic;
 2using System.Linq;
 3using gorilla.utility;
 4
 5namespace solidware.financials.service.domain.payroll
 6{
 7    public class Compensation : Visitable<Grant>
 8    {
 9        IList<Grant> grants = new List<Grant>();
10
11        public void issue_grant(Money grant_value, UnitPrice price, Fraction portion_to_issue_at_each_vest, Frequency frequency)
12        {
13            grants.Add(Grant.New(grant_value, price, portion_to_issue_at_each_vest, frequency));
14        }
15
16        public Grant grant_for(Date date)
17        {
18            return grants.Single(x => x.was_issued_on(date));
19        }
20
21        public Money unvested_balance(Date on_date)
22        {
23            var total = Money.Zero;
24            accept(new AnonymousVisitor<Grant>(grant => total = total.plus(grant.balance(on_date))));
25            return total;
26        }
27
28        public void accept(Visitor<Grant> visitor)
29        {
30            grants.each(x => visitor.visit(x));
31        }
32    }
33}