private void AddLineRelation(StationRelation relation)
{
if (relation.From.Line == relation.To.Line)
{
throw new ArgumentException();
}
ISet <Station> r1;
if (!LineRelationStations.TryGetValue(relation.From.Line, out r1))
{
r1 = new HashSet <Station>();
LineRelationStations.Add(relation.From.Line, r1);
}
r1.Add(relation.From);
ISet <Station> r2;
if (!LineRelationStations.TryGetValue(relation.To.Line, out r2))
{
r2 = new HashSet <Station>();
LineRelationStations.Add(relation.To.Line, r2);
}
r2.Add(relation.To);
}
public IEnumerable <Station> GetLineRelationStations(Line line)
{
if (LineRelationStations.TryGetValue(line, out var result))
{
return(result);
}
throw new KeyNotFoundException();
}