public static void SetColumnIfRequested <T>(this IUpdatableRow source, string colName, Func <T> expr)
{
var colIdx = source.Schema.IndexOf(colName);
if (colIdx != -1)
{
DiagnosticStream.WriteLine(String.Format("Column <{0}> is requested.", colName));
source.Set <T>(colIdx, expr());
}
}
///////////////////////////////////////////////////////////////////////
#region Public Constructors
public Diagnostic(
IHostData hostData
)
: base(hostData)
{
//
// NOTE: Setup the output and error streams.
//
input = new DiagnosticStream(true, false);
output = new DiagnosticStream(false, true);
error = new DiagnosticStream(false, true);
}
public override IEnumerable <IRow> Extract(IUnstructuredReader input, IUpdatableRow outputrow)
{
ulong rowId = 0;
char column_delimiter = '\t';
string lastLine = string.Empty;
string line;
foreach (var stream in input.Split(new byte[] { 0x0d, 0x0a }))
{
var reader = new StreamReader(stream, encoding: Encoding.UTF8);
line = reader.ReadToEnd();
if (string.IsNullOrEmpty(line))
{
DiagnosticStream.WriteLine(String.Format("Skip empty line at line {0}.", rowId));
}
else if (line.StartsWith("id\t"))
{
DiagnosticStream.WriteLine(String.Format("Skip header line at line {0}.", rowId));
}
else
{
try
{
var tokens = line.Split(column_delimiter);
outputrow.Set <int>("id", int.Parse(tokens[0]));
outputrow.Set <DateTime>("date", DateTime.Parse(tokens[1]));
outputrow.Set <string>("market", tokens[2]);
outputrow.Set <string>("searchstring", tokens[3]);
outputrow.Set <int>("time", int.Parse(tokens[4]));
outputrow.Set <string>("found_urls", tokens[5]);
outputrow.Set <string>("visited_urls", tokens[6]);
}
catch
{
DiagnosticStream.WriteLine("============\t <afds />====\n==============\xc4");
DiagnosticStream.WriteLine(String.Format("Last line {0}: {1}", rowId - 1, lastLine));
DiagnosticStream.WriteLine(String.Format("Error line {0}: {1}", rowId, line));
DiagnosticStream.WriteLine("==============================");
}
yield return(outputrow.AsReadOnly());
}
lastLine = line;
++rowId;
}
}