Tim Van Wassenhove

Very often we have to manage objects and their changes over time. Usually we implement this by adding a Range<DateTime> to the data. Martin Fowler has a name for this pattern: Effectivity and i have an implementation for the following interface:

public interface IEffectivity<t> : IComparable<ieffectivity<t>>
{
 T Element { get; }
 IRange<dateTime> ValidityPeriod { get; }
 bool IsEffectiveOn(DateTime validityDate);
}

Feel free to download IEffectivity.txt, Effectivity.txt and EffectivityTester.txt.