// Constructor - takes a one-char name of a train station
public Station(char name)
{
mName = name;
outboundTracks = new Tracks();
}
// constructor - takes a filename with lines of the following format
// xyn, where x and y are single char names of train stations, and n is the distance between them
// Note that there is no error checking in reading the file
public TrainSystem(string strFileName)
{
// Instantiate an empty stations collection
mStations = new Stations();
// Instantiate an empty tracks collection
mTracks = new Tracks();
// Open the file for reading as a stream
StreamReader fsIn = File.OpenText(strFileName);
// local variable to hold the string representing each track
string strTrack;
// local variables to hold the source and target station objects
Station sourceStation, targetStation;
// Loop through each string in the input file, setting str to each string
while ((strTrack = fsIn.ReadLine()) != null)
{
// If the source station doesn't already exist in the station collection, add it
// Also - set a local variable to represent the source station
if (!mStations.Exists(strTrack[0]))
{
Station newStation = new Station(strTrack[0]);
mStations.Add(newStation);
sourceStation = newStation;
}
// else, the source station exists - simply retrieve it from the collection
else
{
sourceStation = mStations.GetStation(strTrack[0]);
}
// If the target station doesn't already exist in the station collection, add it
// Also - set a local variable to represent the target station
if (!mStations.Exists(strTrack[1]))
{
Station newStation = new Station(strTrack[1]);
mStations.Add(newStation);
targetStation = newStation;
}
// else, the target station exists - simply retrieve it from the collection
else
{
targetStation = mStations.GetStation(strTrack[1]);
}
// Create a new track object to represent the track
// Get the distance by converting the 1-character representation of the distance to a value
int distance = Convert.ToByte(strTrack[2]) - Convert.ToByte('0');
Track newTrack = new Track(sourceStation, targetStation, distance);
// Add the track to the track collection
mTracks.Add(newTrack);
// Add the track to the outbound track collection for the source station
sourceStation.AddTrack(newTrack);
}
// Close the file
fsIn.Close();
}