public void AddStation(String stationName)
{
if(!this.HasStation(stationName))
{
Station station = new Station(stationName);
stations.Add(station);
}
}
public void AddConnection(string station1Name, string station2Name, string connectionName)
{
if ((this.HasStation(station1Name)) && (this.HasStation(station2Name)))
{
Station station1 = new Station(station1Name);
Station station2 = new Station(station2Name);
Connection connection = new Connection(station1, station2, connectionName);
connections.Add(connection);
connections.Add(new Connection(station2, station1, connection.LineName));
AddToNetwork(station1, station2);
AddToNetwork(station2, station1);
}
else
{
throw new KeyNotFoundException("Invalid connection!");
}
}
public Connection(Station station1, Station station2, string lineName)
{
this.station1 = station1;
this.station2 = station2;
this.lineName = lineName;
}
public List<Connection> GetDirections(string startStationName, string endStartionName)
{
if (!this.HasStation(startStationName) || (!this.HasStation(endStartionName)))
{
throw new KeyNotFoundException("Stations enterered do not exists on this subway");
}
Station start = new Station(startStationName);
Station end = new Station(endStartionName);
List<Connection> route = new List<Connection>();
List<Station> reachableStations = new List<Station>();
Dictionary<Station, Station> previousStation = new Dictionary<Station, Station>();
List<Station> neighbours = (List<Station>)network[start];
foreach (var station in neighbours)
{
if (station.Equals(end))
{
route.Add(GetConnection(start, end));
return route;
}
else
{
reachableStations.Add(station);
previousStation.Add(station, start);
}
}
List<Station> nextStations = new List<Station>();
nextStations.AddRange(neighbours);
Station currentStation = start;
//searchLoop
for (int i = 0; i < stations.Count; i++)
{
List<Station> tmpNextStations = new List<Station>();
foreach (var station in nextStations)
{
reachableStations.Add(station);
currentStation = station;
List<Station> currentNeighbours = (List<Station>)network[currentStation];
foreach (var neighbor in currentNeighbours)
{
if (neighbor.Equals(end))
{
reachableStations.Add(neighbor);
previousStation.Add(neighbor, currentStation);
goto loopEnd;
}
else if (!reachableStations.Contains(neighbor))
{
reachableStations.Add(neighbor);
tmpNextStations.Add(neighbor);
previousStation.Add(neighbor, currentStation);
}
}
}
nextStations = tmpNextStations;
}
loopEnd:
bool keepLooping = true;
Station keyStation = end;
while (keepLooping)
{
Station station = (Station)previousStation[keyStation];
route.Add(GetConnection(station, keyStation));
if (start.Equals(station))
keepLooping = false;
keyStation = station;
}
return route;
}
private Connection GetConnection(Station station1, Station station2)
{
foreach (var connection in connections)
{
Station one = connection.Station1;
Station two = connection.Station2;
if((station1.Equals(one) && (station2.Equals(two))))
return connection;
}
return null;
}
private void AddToNetwork(Station station1, Station station2)
{
if (network.ContainsKey(station1))
{
List<Station> connectingStations = (List<Station>)network[station1];
if (!connectingStations.Contains(station2))
connectingStations.Add(station2);
}
else
{
List<Station> connectingStations = new List<Station>();
connectingStations.Add(station2);
network.Add(station1, connectingStations);
}
}
public bool HasConnection(string station1Name, string station2Name, string lineName)
{
Station station1 = new Station(station1Name);
Station station2 = new Station(station2Name);
foreach (Connection connection in connections)
{
if (connection.LineName.Equals(lineName, StringComparison.OrdinalIgnoreCase))
{
if((connection.Station1.Equals(station1)) && (connection.Station2.Equals(station2)))
return true;
}
}
return false;
}
