public void CopyFrom(FinalLine f) // avoids aliasing problems => copies values form f to this
{
this.StartStn = f.StartStn;
this.EndStn = f.EndStn;
this.StartTime = f.StartTime;
this.EndTime = f.EndTime;
}
// Mocking methods
private int LoadPreSortedData() // speeds up debugging by not having to re sort file
{
FinalLine f = new FinalLine();
StreamReader r = new StreamReader(SourceFile);
List <FinalLine> sorted = new List <FinalLine>();
FileInfo fi = new FileInfo(SourceFile);
long size = fi.Length; // size in bits
long bytesRead = 0;
int percent = 0;
const int bytesPerChar = 1; //ASCII
string line;
while (!r.EndOfStream)
{
line = r.ReadLine();
f.ReadLine(line);
sorted.Add(new FinalLine(f));
bytesRead += (line.Length + 2) * bytesPerChar; // +2 to account for return char and new line
if (percent < bytesRead * 100 / size)
{
percent++;
bgw.ReportProgress(percent);
}
}
r.Close();
Records.AddFirst(sorted);
return(Records.First().Count());
}
public bool ComesBefore(FinalLine f) // returns true if this FinalLine comes before f according to ordering
{
// if result is false => swap
if (this.StartStn < f.StartStn) // primary ordering
{
return(true);
}
else if (this.StartStn > f.StartStn)
{
return(false);
}
else // start stations are the same
{
if (this.EndStn < f.EndStn) // secondary ordering
{
return(true);
}
else if (this.EndStn > f.EndStn)
{
return(false);
}
else // end stations also the same
{
if (this.StartTime <= f.StartTime) // tertiary ordering
{
return(true);
}
else
{
return(false);
}
}
}
}
private int FirstPass(StationDictionary stations) // reads in data and converts to numerical form
{
StreamReader r = new StreamReader(SourceFile);
FinalLine f = new FinalLine();
FileInfo fi = new FileInfo(SourceFile);
long size = fi.Length; //bytes in file
long bytesRead = 0;
int percent = 0;
string line;
const int bytesPerChar = 1; // UTF-8
while (!r.EndOfStream)
{
line = r.ReadLine();
if (f.TryInitialise(line, stations))
{
Records.AddFirst(new List <FinalLine> {
new FinalLine(f)
});
}
bytesRead += (line.Length + 2) * bytesPerChar; // +2 to account for return and new line
if (percent < (bytesRead * split) / size)
{
percent++;
bgw.ReportProgress(percent);
}
}
r.Close();
return(Records.Count());
}
public FinalLine(FinalLine f) // creates new instance of class with same attributes as f
{
CopyFrom(f);
}
private void MergeFirstTwo() // merges first two lists and puts result at back
{
List <FinalLine> aList = Records.First();
List <FinalLine> bList = Records.ElementAt(1);
List <FinalLine> merged = new List <FinalLine>();
FinalLine aLine = new FinalLine();
FinalLine bLine = new FinalLine();
int a = 0;
int b = 0;
bool ongoing = true;
aLine = aList[a];
a++;
bLine = bList[b];
b++;
while (ongoing)
{
if (aLine.ComesBefore(bLine))
{
merged.Add(new FinalLine(aLine));
if (a < aList.Count())
{
aLine = aList[a];
a++;
}
else
{
ongoing = false;
merged.Add(new FinalLine(bLine));
for (int i = b; i < bList.Count(); i++)
{
merged.Add(new FinalLine(bList[i]));
}
}
}
else
{
merged.Add(new FinalLine(bLine));
if (b < bList.Count())
{
bLine = bList[b];
b++;
}
else
{
ongoing = false;
merged.Add(new FinalLine(aLine));
for (int i = a; i < aList.Count(); i++)
{
merged.Add(new FinalLine(aList[i]));
}
}
}
}
Records.RemoveFirst(); // remove first two lists
Records.RemoveFirst();
Records.AddLast(merged); // add merged result to back
}
