public IEnumerable <T> ReadAll()
{
using (var reader = File.OpenText(_path))
{
int lineNo = 0;
T parsedLine = null;
while (reader.Peek() >= 0)
{
try
{
lineNo++;
string line = reader.ReadLine();
if (string.IsNullOrWhiteSpace(line))
{
InvalidFormatException.EmptyOrNull();
}
parsedLine = Parse(line);
}
catch (Exception e)
{
throw InvalidFormatException.Create(lineNo, e);
}
yield return(parsedLine);
}
}
}
protected override UserDetail Parse(string line)
{
var lineItems = line.Split(_userAndFollowsSplit, StringSplitOptions.RemoveEmptyEntries);
if (lineItems.Length != 2)
{
throw InvalidFormatException.Create(line);
}
try
{
return(new UserDetail()
{
User = lineItems[0],
Follows = ParseFollows(lineItems[1])
});
}
catch (Exception e)
{
throw InvalidFormatException.Create(line, e);
}
}
protected override Tweet Parse(string line)
{
int index = line.IndexOf("> ");
if (index < 0)
{
InvalidFormatException.Create(line);
}
User creator = line.Substring(0, index);
index += 2;
if (index > line.Length)
{
InvalidFormatException.Create(line);
}
string text = line.Substring(index, line.Length - index);
return(new Tweet(creator, text));
}