private IEnumerable <Message> ReadFile(FileInfo file)
{
// whoops, no file, let's return an empty list
if (file == null)
{
yield break;
}
// if no file, don't panic
if (!file.Exists)
{
yield break;
}
// looks like we got the file, read it to the end
// TODO: consider passing a stream to the serializer, in case the file is too big?
bool skipFirstLine = _serializer.IncludeHeaders;
using (StreamReader sr = file.OpenText())
{
string s = "";
while ((s = sr.ReadLine()) != null)
{
// some formatters support a header row, i.e. the CSV files, which means
// we need to skip the header
if (skipFirstLine)
{
skipFirstLine = false;
continue;
}
yield return(_serializer.Parse(s));
}
}
}
/// <summary>
/// It parses the information in the parser context and builds the field.
/// </summary>
/// <param name="parserContext">
/// It's the parser context.
/// </param>
/// <returns>
/// The new field built with the information found in the parser context.
/// </returns>
public override Field Parse(ref ParserContext parserContext)
{
// If MinValue, at this moment the length hasn't been decoded.
if (parserContext.DecodedLength == int.MinValue)
{
if (!_lengthManager.EnoughData(ref parserContext))
{
// Insufficient data to parse length, return null.
return(null);
}
// Save length in parser context just in case field value
// can't be parsed at this time (more data needed).
parserContext.DecodedLength =
_lengthManager.ReadLength(ref parserContext);
}
if (parserContext.DataLength < _encoder.GetEncodedLength(
parserContext.DecodedLength))
{
// Insufficient data to parse field value, return null.
return(null);
}
Message message = null;
if (parserContext.DecodedLength > 0)
{
ParserContext innerMsgParserContext = new ParserContext(parserContext.DecodedLength);
innerMsgParserContext.Write(
_encoder.Decode(ref parserContext, parserContext.DecodedLength));
message = _messageFormatter.Parse(ref innerMsgParserContext);
if (message == null)
{
throw new MessagingException(SR.CantParseInnerMessage);
}
}
// Create the new messaging component with parsing context data.
InnerMessageField field = new InnerMessageField(FieldNumber, message);
_lengthManager.ReadLengthTrailer(ref parserContext);
return(field);
}