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