/// <summary>
/// Gets the specified element without removing it.
/// </summary>
/// <param name="index"> The index of the specific element to peek. </param>
/// <returns> The element at the specified position or default(T) when the queue was empty. </returns>
/// <exception cref="LoggedException"> The index was out of bounds. </exception>
/// <exception cref="LoggedException"> An unhandled exception occured whilst excecuting the method. </exception>
public T Peek(int index)
{
EnterWriteLock();
if (size == 0)
{
ExitWriteLock();
return(default(T));
}
if (index >= size)
{
ExitWriteLock();
LoggedException.Raise(nameof(ThreadSafeQueue <T>), "index must be smaller than the size of the queue", new IndexOutOfRangeException());
}
T result = data[(head + index) % data.Length];
ExitWriteLock();
return(result);
}
private static void RaiseLinqException(string method, Exception inner)
{
LoggedException.Raise(nameof(ArrayExtensions), $"{method} has encountered an unhandled exception", inner);
}
public static List <RETRoute> ReadRoutesFromFile(string fileName)
{
fileName = $"{Settings.Default.DataDirectory}{fileName}";
List <RETRoute> result = new List <RETRoute>();
curLine = 0;
LoggedException.RaiseIf(!fileName.EndsWith(".PAS"), nameof(PASReader),
$"Cannot open file with extension {Path.GetExtension(fileName)}, supply .pas file");
try
{
using (StreamReader sr = new StreamReader(fileName))
{
Log.Verbose(nameof(CSVReader), $"Started parsing file: '{Path.GetFileName(fileName)}'");
RETRoute cur = null;
string line;
while ((line = sr.ReadLine()) != null)
{
++curLine;
try
{
switch (line[0])
{
case ('!'):
CheckFormat(line);
break;
case ('&'):
CheckValidity(line);
break;
case ('#'):
cur = ReadRouteLine(line);
break;
case ('-'):
Log.Debug(nameof(PASReader), "Skipped day code line (Useless)");
ReadDayCodeLine(line);
break;
case ('>'):
if (cur == null)
{
Log.Error(nameof(PASReader), $"Floating stop at line: {curLine} (Ignored)");
}
else if (cur.Stops.Count > 0)
{
Log.Error(nameof(PASReader), $"Second start stop at line: {curLine} (Ignored)");
}
else
{
cur.Stops.Add(ReadStopStartLine(line));
}
break;
case ('.'):
if (cur == null)
{
Log.Error(nameof(PASReader), $"Floating stop at line: {curLine} (Ignored)");
}
else if (cur.Stops.Count < 1)
{
Log.Error(nameof(PASReader), $"Intermediate stop with no start at line: {curLine} (Ignored)");
}
else
{
cur.Stops.Add(ReadStopLine(line));
}
break;
case ('+'):
if (cur == null)
{
Log.Error(nameof(PASReader), $"Floating big stop at line: {curLine} (Ignored)");
}
else if (cur.Stops.Count < 1)
{
Log.Error(nameof(PASReader), $"Big stop with no start at line: {curLine} (Ignored)");
}
else
{
cur.Stops.Add(ReadBigStopLine(line));
}
break;
case ('<'):
if (cur == null)
{
Log.Error(nameof(PASReader), $"Floating stop at line: {curLine} (Ignored)");
}
else if (cur.Stops.Count < 1)
{
Log.Error(nameof(PASReader), $"End stop with no start at line: {curLine} (Ignored)");
}
else
{
cur.Stops.Add(ReadStopEndLine(line));
}
result.Add(cur);
cur = null;
break;
default:
Log.Warning(nameof(PASReader), $"Unknown line type at line: {curLine}");
break;
}
}
catch (Exception e)
{
LoggedException.Raise(nameof(PASReader), $"An unhandled excpetion was raised at line: {curLine}", e);
}
}
Log.Info(nameof(CSVReader), $"File contains {result.Count} readable entries");
}
}
catch (Exception e)
{
Log.Fatal(nameof(CSVReader), new FileLoadException($"An unhandled exception was raised during the processing of file: '{Path.GetFullPath(fileName)}'", e));
}
Log.Verbose(nameof(CSVReader), $"Finished parsing file: '{Path.GetFileName(fileName)}'");
return(result);
}