private static IList <StationLocation> RedwardPath(StationLocation fromLocation, StationLocation toLocation)
{
var redwardLocation = fromLocation.RedwardStationLocation();
if (redwardLocation == null)
{
return(null);
}
if (redwardLocation == toLocation)
{
return new List <StationLocation> {
toLocation
}
}
;
var oppositeDeckPath = OppositeDeckPath(redwardLocation.Value, toLocation);
if (oppositeDeckPath != null)
{
return new List <StationLocation> {
redwardLocation.Value, oppositeDeckPath.Single()
}
}
;
var redwardPath = RedwardPath(redwardLocation.Value, toLocation);
return(redwardPath == null ? null : new[] { redwardLocation.Value }.Concat(RedwardPath(redwardLocation.Value, toLocation)).ToList());
}
protected override StationLocation?GetStationToSpreadTo(StationLocation stationLocation)
{
return(stationLocation.RedwardStationLocation());
}
