/// <summary>
/// Reads an EDI item from the stream.
/// </summary>
/// <returns>Indication if an item was read.</returns>
public override bool Read()
{
if (Item is ReaderErrorContext && !ContinueOnError)
{
return(false);
}
Item = null;
try
{
while ((!StreamReader.EndOfStream || InternalBuffer.Any()) && Item == null)
{
var segment = ReadSegment();
if (Separators == null)
{
throw new ReaderException("No valid separator set was found.", ReaderErrorCode.InvalidControlStructure);
}
if (string.IsNullOrEmpty(segment))
{
continue;
}
Item = Split(segment) ?? Process(segment);
}
}
catch (ReaderException ex)
{
Item = new ReaderErrorContext(ex, ex.ErrorCode);
}
catch (ParserMessageException ex)
{
Item = new ReaderErrorContext(ex, ReaderErrorCode.InvalidSpecOrAssembly, ex.MessageErrorContext);
}
catch (Exception ex)
{
Item = new ReaderErrorContext(ex, ReaderErrorCode.Unknown);
}
if (StreamReader.EndOfStream && CurrentSegments.Any())
{
Item = new ReaderErrorContext(new Exception("Improper end of file."), ReaderErrorCode.ImproperEndOfFile);
}
var readerErrorContext = Item as ReaderErrorContext;
if (readerErrorContext != null)
{
CurrentSegments.Clear();
if (readerErrorContext.MessageErrorContext == null)
{
Separators = null;
}
}
return(Item != null);
}
/// <summary>
/// Reads an item from the stream.
/// </summary>
/// <returns>Indication if an item was read.</returns>
public override bool Read()
{
if (Item is ReaderErrorContext && !ContinueOnError)
{
return(false);
}
Item = null;
try
{
while ((!StreamReader.EndOfStream || InternalBuffer.Any()) && Item == null)
{
var segment = ReadSegment();
if (string.IsNullOrEmpty(segment))
{
continue;
}
Item = Process(segment);
}
}
catch (ReaderException ex)
{
Item = new ReaderErrorContext(ex, ex.ErrorCode);
}
catch (ParserMessageException ex)
{
Item = new ReaderErrorContext(ex, ReaderErrorCode.InvalidSpecOrAssembly, ex.MessageErrorContext);
}
catch (Exception ex)
{
Item = new ReaderErrorContext(ex, ReaderErrorCode.Unknown);
}
if (StreamReader.EndOfStream && CurrentSegments.Any())
{
Item = Flush(null);
}
var readerErrorContext = Item as ReaderErrorContext;
if (readerErrorContext != null)
{
CurrentSegments.Clear();
}
return(Item != null);
}
/// <summary>
/// Reads from the stream until a non-escaped segment terminator was reached.
/// Breaks if no segment terminator was encountered after 5000 symbols were read.
/// This is to avoid loading large and corrupt files.
/// </summary>
/// <returns>
/// The segment.
/// </returns>
protected override string ReadSegment()
{
var line = "";
var postFix = "";
while ((!StreamReader.EndOfStream || InternalBuffer.Any()) && line.Length < MaxSegmentLength)
{
line = line + Read(1);
}
while (!string.IsNullOrEmpty(_postFix) && !StreamReader.EndOfStream && postFix.Length < _postFix.Length)
{
postFix = postFix + Read(1);
}
if (!string.IsNullOrEmpty(_postFix) && postFix != _postFix)
{
throw new Exception(string.Format("Postfix {0} is different than the expected {1}", postFix, _postFix));
}
return(line);
}
/// <summary>
/// Reads from the stream until a non-escaped segment terminator was reached.
/// Breaks if no segment terminator was encountered after 5000 symbols were read.
/// This is to avoid loading large and corrupt files.
/// </summary>
/// <returns>
/// An EDI segment.
/// </returns>
protected override string ReadSegment()
{
var line = "";
while (!StreamReader.EndOfStream || InternalBuffer.Any())
{
line = line + Read(1);
if (line.Length > 2)
{
var last3 = line.Substring(line.Length - 3);
Separators separators;
string probed;
if (TryReadHeader(last3, out probed, out separators))
{
Separators = separators;
Trims = Trims.Except(new[] { Separators.Segment }).ToArray();
line = probed;
}
else
{
if (!string.IsNullOrEmpty(probed))
{
Buffer(probed.Skip(3));
}
}
}
// Segment terminator may never be reached
if (line.Length > MaxSegmentLength)
{
// Reset and continue or break
if (ContinueOnError)
{
line = "";
}
else
{
throw new ReaderException(
string.Format("No segment was found before the buffer reached the allowed maximum of {0}.", MaxSegmentLength),
ReaderErrorCode.InvalidInterchangeContent);
}
}
if (Separators == null)
{
continue;
}
if (!line.EndsWith(Separators.Segment.ToString(), StringComparison.Ordinal))
{
continue;
}
if (Separators.Escape.HasValue &&
line.EndsWith(string.Concat(Separators.Escape.Value, Separators.Segment),
StringComparison.Ordinal))
{
continue;
}
var index = line.LastIndexOf(Separators.Segment.ToString(), StringComparison.Ordinal);
if (index > 0)
{
line = line.Remove(index);
}
if (!string.IsNullOrEmpty(line))
{
break;
}
}
return(line.Trim(Trims));
}