/// <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);
}
/// <summary>
/// It parses the data contained in the parser context.
/// </summary>
/// <param name="parserContext">
/// It's the context holding the information to produce a new message instance.
/// </param>
/// <returns>
/// The parsed message, or a null reference if the data contained in the context
/// is insufficient to produce a new message.
/// </returns>
public virtual Message Parse(ref ParserContext parserContext)
{
// Create a new message if we are parsing a new one.
if (parserContext.CurrentMessage == null)
{
parserContext.CurrentMessage = NewMessage();
// The message must known its formatter for message.ToString()
parserContext.CurrentMessage.Formatter = this;
}
// Remove packet header data.
if ((_packetHeader != null) && !parserContext.PacketHeaderDataStripped)
{
parserContext.Consumed(_packetHeader.Length);
parserContext.PacketHeaderDataStripped = true;
}
// Parse header if we have a header formatter.
if (_headerFormatter != null)
{
// Check if the header hasn't been parsed yet.
if (parserContext.CurrentMessage.Header == null)
{
try {
parserContext.CurrentMessage.Header =
_headerFormatter.Parse(ref parserContext);
} catch (Exception e) {
throw new MessagingException(SR.CantParseMessageHeader, e);
}
// If null, more data is needed.
if (parserContext.CurrentMessage.Header == null)
{
return(null);
}
parserContext.ResetDecodedLength();
}
}
// Allow subclasses to get information between header data and
// fields data.
if (!parserContext.Signaled)
{
if (!BeforeFieldsParsing(parserContext.CurrentMessage, ref parserContext))
{
return(null);
}
parserContext.Signaled = true;
}
for (int i = parserContext.CurrentField;
i <= _fieldsFormatters.MaximumFieldFormatterNumber; i++)
{
// If we have a bitmap use it to detect present fields,
// otherwise parse known message formatter fields.
if (parserContext.CurrentBitMap != null)
{
// Check if field number is out of bitmap bounds.
if (i > parserContext.CurrentBitMap.UpperFieldNumber)
{
// Locate another bitmap.
bool found = false;
for (int j = parserContext.CurrentBitMap.FieldNumber + 1;
j < i; j++)
{
if (parserContext.CurrentMessage.Fields.Contains(j))
{
Field field = parserContext.CurrentMessage.Fields[j];
if (field is BitMapField)
{
// Another bitmap found.
parserContext.CurrentBitMap = ( BitMapField)field;
found = true;
break;
}
}
}
if (!found)
{
parserContext.CurrentBitMap = null;
// No more bitmaps, continue with posible mandatory fields
// (start from last field covered by known bitmaps, plus one).
i = ((BitMapFieldFormatter)
(_fieldsFormatters[_bitmaps[_bitmaps.Length - 1]])).UpperFieldNumber + 1;
continue;
}
}
if (!parserContext.CurrentBitMap[i])
{
// Save current field number in context.
parserContext.CurrentField = i;
// Bit is not set, field is not present in the received data.
continue;
}
}
// Save current field number in context.
parserContext.CurrentField = i;
if (_fieldsFormatters.Contains(i))
{
// Get field formatter.
FieldFormatter fieldFormatter = _fieldsFormatters[i];
Field field;
try {
// to parse field.
field = fieldFormatter.Parse(ref parserContext);
} catch (Exception e) {
throw new MessagingException(SR.CantParseField(i), e);
}
if (field == null)
{
if (Logger.IsDebugEnabled)
{
Logger.Debug(SR.MoreDataNeeded);
}
// More data needed to parse message.
return(null);
}
else
{
parserContext.CurrentMessage.Fields.Add(field);
// Set parent message.
if (field is InnerMessageField)
{
InnerMessageField innerMessageField = field as InnerMessageField;
Message innerMessage = innerMessageField.Value as Message;
if (innerMessage != null)
{
innerMessage.Parent = parserContext.CurrentMessage;
}
}
if (Logger.IsDebugEnabled)
{
if (field is BitMapField)
{
Logger.Debug(SR.DecodedBitmap(field.FieldNumber, field.ToString()));
}
else
{
Logger.Debug(SR.DecodedField(field.FieldNumber, field.ToString()));
}
}
parserContext.ResetDecodedLength();
// If this is the first located bitmap, save it.
if ((parserContext.CurrentBitMap == null) &&
(field is BitMapField))
{
parserContext.CurrentBitMap = ( BitMapField)field;
}
}
}
else
{
if (parserContext.CurrentBitMap != null)
{
// A field is present in current bitmap, but message formatter
// can't parse it because field formatter isn't present.
throw new MessagingException(SR.UnknownFormatter(i));
}
}
}
// We have a new message, get it and initialize parsing context.
Message parsedMessage = parserContext.CurrentMessage;
// Reset parser context.
parserContext.MessageHasBeenConsumed();
return(parsedMessage);
}
/// <summary>
/// It formats a message.
/// </summary>
/// <param name="message">
/// It's the message to be formatted.
/// </param>
/// <param name="formatterContext">
/// It's the formatter context to be used in the format.
/// </param>
public virtual void Format(Message message,
ref FormatterContext formatterContext)
{
formatterContext.CurrentMessage = message;
// Write header.
if (_packetHeader != null)
{
formatterContext.Write(_packetHeader);
}
// Format header if we have one header formatter.
if (_headerFormatter != null)
{
try {
_headerFormatter.Format(message.Header, ref formatterContext);
} catch (Exception e) {
throw new MessagingException(SR.CantFormatMessageHeader, e);
}
}
// Allow subclasses to put information between header data and
// fields data.
BeforeFieldsFormatting(message, ref formatterContext);
// If bitmaps are present in the message formatter, check if we
// must add them to the message.
bool atLeastOne = false;
int firstBitmap = -1;
for (int i = _bitmaps.Length - 1; (i >= 0) && (_bitmaps[i] >= 0); i--)
{
firstBitmap = i;
if (message.Fields.Contains(_bitmaps[i]))
{
// Check if present field is a bitmap.
if (!(message[_bitmaps[i]] is BitMapField))
{
throw new MessagingException(SR.FieldMustBeBitmap(_bitmaps[i]));
}
atLeastOne = true;
}
else
{
// Get bitmap from field formatters collection.
BitMapFieldFormatter bitmap =
( BitMapFieldFormatter)_fieldsFormatters[_bitmaps[i]];
// Add bitmap to message if required.
if (message.Fields.ContainsAtLeastOne(bitmap.LowerFieldNumber,
bitmap.UpperFieldNumber))
{
message.Fields.Add(new BitMapField(bitmap.FieldNumber,
bitmap.LowerFieldNumber, bitmap.UpperFieldNumber));
atLeastOne = true;
}
}
}
if (!atLeastOne && firstBitmap > -1)
{
// In a bitmaped message, at least the first bitmap must be present.
BitMapFieldFormatter bitmap = ( BitMapFieldFormatter )_fieldsFormatters[_bitmaps[firstBitmap]];
message.Fields.Add(new BitMapField(bitmap.FieldNumber,
bitmap.LowerFieldNumber, bitmap.UpperFieldNumber));
}
// Correct bitmap values.
message.CorrectBitMapsValues();
// Format fields.
for (int i = 0; i <= message.Fields.MaximumFieldNumber; i++)
{
if (message.Fields.Contains(i))
{
// If we haven't the field formatter, throw an exception.
if (!_fieldsFormatters.Contains(i))
{
throw new MessagingException(SR.UnknownFieldFormatter(i));
}
// Set parent message.
if (message.Fields[i] is InnerMessageField)
{
InnerMessageField innerMessageField = message.Fields[i] as InnerMessageField;
if (innerMessageField != null)
{
Message innerMessage = innerMessageField.Value as Message;
if (innerMessage != null)
{
innerMessage.Parent = message;
}
}
}
try {
_fieldsFormatters[i].Format(message.Fields[i],
ref formatterContext);
} catch (Exception e) {
throw new MessagingException(SR.CantFormatField(i), e);
}
}
}
}
