/// <summary>
/// The RoverGraph constructor stores the injected IDirectionsInfoContainer as well as
/// the ParsedCoordinatesData of the IParser.
/// </summary>
/// <param name="fileParser">The IParsed containing the grid and rover data.</param>
/// <param name="directionsInfoContainer">The injected IDirectionsInfoContainer object that defines the directions in which the IGraphNodes are connected.</param>
public RoverGraph(IParser fileParser, IDirectionsInfoContainer directionsInfoContainer)
{
_directionsInfoContainer = directionsInfoContainer;
// Set the upper right boundary
_upperRightCoordinateBoundary = fileParser.ParsedCoordinatesData;
_graphData = PopulateGraphNodes();
ConnectAllNodes();
}
/// <summary>
/// Reads the input text file sequentially and passes the rover information to a Parse function
/// which parses the data into meaningful representative objects. Does all error checking
/// regarding the input file.
/// </summary>
/// <param name="strFilePath">The windows path (relative or absolute) to the input text file.</param>
/// <returns>An IList of IParsedRoverData objects representing rover information.</returns>
private IList <IParsedRoverData> DoReadFile(string strFilePath)
{
IList <IParsedRoverData> parsedRoverDataObjects = new List <IParsedRoverData>();
StreamReader streamReader;
try
{
using (streamReader = File.OpenText(strFilePath))
{
// The first line is the top-right coordinates
string currentLine = streamReader.ReadLine();
if (currentLine == null)
{
throw new Exception("Input file is empty");
}
Regex properCoordinatesInputPattern = new Regex("^[0-9]+ [0-9]+$");
if (!properCoordinatesInputPattern.IsMatch(currentLine))
{
throw new Exception("Mal-formed or missing top-right coordinates data encountered in input file");
}
string[] result = currentLine.Trim().Split(' ');
int xCoord = Convert.ToInt32(result[0]);
int yCoord = Convert.ToInt32(result[1]);
_parsedCoordinatesData = new ParsedCoordinatesData(xCoord, yCoord);
// Now handle all other lines per usual for rover data
string roverInitialLocation;
string roverControlCommands;
bool isRoverDataPresent = false;
while ((roverInitialLocation = streamReader.ReadLine()) != null)
{
isRoverDataPresent = true;
if ((roverControlCommands = streamReader.ReadLine()) == null)
{
throw new Exception("Missing rover data encountered in input file");
}
parsedRoverDataObjects.Add(Parse(roverInitialLocation.ToUpper(), roverControlCommands.ToUpper()));
}
if (!isRoverDataPresent)
{
throw new Exception("No rover data encountered in input file");
}
}
}
catch (FileNotFoundException ex)
{
throw new Exception("The input file cannot be found.", ex);
}
catch (Exception ex)
{
throw new Exception("The input file cannot be read (" + ex.Message + ")", ex);
}
return(parsedRoverDataObjects);
}