private Resultset CreateResultset(Stream stream, out string fileName, QueryContext queryContext)
{
DataTable dt = null;
TextFileDataFormat format = queryContext.GetTextFileDataFormat();
fileName = null;
if (stream is FileStream)
{
fileName = ((FileStream)stream).Name;
dt = CreateRowType(fileName, ref format);
}
StreamReader reader = new StreamReader(stream, format.Encoding);
if (dt == null || dt.Rows.Count == 0)
{
switch (format.TextFormat)
{
case TextDataFormat.Delimited:
dt = CreateRowType(reader, format.Delimiter[0], format.ColumnNameHeader);
break;
case TextDataFormat.TabDelimited:
dt = CreateRowType(reader, '\t', format.ColumnNameHeader);
break;
default:
throw new ArgumentException("Delimiter");
}
stream.Seek(0, SeekOrigin.Begin);
reader = new StreamReader(stream, format.Encoding);
}
ProcessingContextBase context;
if (format.SequentialProcessing)
{
if (format.TextFormat == TextDataFormat.FixedLength)
context = new ProcessingContext(reader, format.Width, format.NullValue, format.ColumnNameHeader,
GetNumberFormatInfo(format), GetDateTimeFormatInfo(format));
else
context = new ProcessingContext(reader, format.Delimiter[0], format.NullValue, format.ColumnNameHeader,
GetNumberFormatInfo(format), GetDateTimeFormatInfo(format));
}
else
{
if (format.TextFormat == TextDataFormat.FixedLength)
context = new ParallelProcessingContext(reader, format.Width, format.NullValue, format.ColumnNameHeader,
GetNumberFormatInfo(format), GetDateTimeFormatInfo(format));
else
context = new ParallelProcessingContext(reader, format.Delimiter[0], format.NullValue, format.ColumnNameHeader,
GetNumberFormatInfo(format), GetDateTimeFormatInfo(format));
}
return new Resultset(new RowType(dt), context);
}
