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namespace domain
{
using System;
public class Month : IComparable<Month>, IIncrementable<Month>
{
DateTime date;
public static readonly Month Infinity = new Month(2099, 12);
public Month(int year, int month)
{
date = new DateTime(year, month, 01);
}
public Month Plus(int months)
{
return ToMonth(date.AddMonths(months));
}
public bool IsBefore(Month other)
{
return this.CompareTo(other) < 0;
}
Month ToMonth(DateTime date)
{
return new Month(date.Year, date.Month);
}
static public Month Now()
{
var now = Clock.Now();
return new Month(now.Year, now.Month);
}
public int CompareTo(Month other)
{
return this.date.CompareTo(other.date);
}
public Month Next()
{
return Plus(1);
}
public bool Equals(Month other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return other.date == date;
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != typeof (Month)) return false;
return Equals((Month) obj);
}
public override int GetHashCode()
{
unchecked
{
return (date.Year*397) ^ date.Month;
}
}
public override string ToString()
{
return string.Format("{0} {1}", date.Year, date.Month);
}
}
}
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