public TrackStretch Add(TrackStretch stretch)
{
if (stretch == null)
{
throw new ArgumentNullException(nameof(stretch));
}
if (TrackStretches.Contains(stretch))
{
return(stretch);
}
TrackStretches.Add(stretch);
return(TrackStretches.Last());
}
public Maybe <TrackStretch> TrackStretch(Station from, Station to)
{
var stretches = TrackStretches.Where(ts => (ts.Start.Station.Equals(from) && ts.End.Station.Equals(to)) ||
(ts.Start.Station.Equals(to) && ts.End.Station.Equals(from)));
if (stretches.Count() == 1)
{
return(Maybe <TrackStretch> .Item(stretches.First()));
}
if (!stretches.Any())
{
return(Maybe <TrackStretch> .None(string.Format(CultureInfo.CurrentCulture, Resources.Strings.ThereIsNoStretchBetweenStation1AndStation2, from, to)));
}
return(Maybe <TrackStretch> .None(string.Format(CultureInfo.CurrentCulture, Resources.Strings.MoreThanOneStretchBetweenStations, from, to)));
}
