/// <summary>
/// Parses the received HL7 message.
/// </summary>
/// <param name="messageForm">The raw message encoded in HL7 'pipes and hats' format.</param>
/// <returns>The parsed HL7 message object</returns>
/// <exception cref="HL7ParseException">Thrown when parsing fails</exception>
public static HL7Message Parse(string messageForm)
{
// Determine the HL7 separators dynamically from the incoming message (usually "|^~\&")
HL7Separators sep = new HL7Separators(messageForm);
// Change CRLF or LF into the standard CR separators
if (messageForm.Contains("\r\n"))
{
messageForm = messageForm.Replace("\r\n", "\r");
}
if (messageForm.Contains("\n"))
{
messageForm = messageForm.Replace("\n", "\r");
}
// Remove consecutive segment separators
while (messageForm.Contains("\r\r"))
{
messageForm = messageForm.Replace("\r\r", "\r");
}
// Parse all the segments
messageForm = messageForm.TrimEnd(new char[] { sep.SegmentSeparator });
string[] segmentForm = messageForm.Split(sep.SegmentSeparator);
for (int count = 0; count < segmentForm.Count(); count++)
{
segmentForm[count] = segmentForm[count].Replace("\n", string.Empty);
}
HL7Segment[] segments = new HL7Segment[segmentForm.Length];
for (int i = 0; i < segmentForm.Length; i++)
{
segments[i] = HL7Segment.Parse(segmentForm[i], sep);
}
// Grab the MSH segment in order to determine which message structure to use
MSH msh = segments[0] as MSH;
if (msh == null)
{
throw new HL7ParseException(ConstantsResource.HL7NoMshSegment);
}
if (msh.MessageType == null)
{
throw new HL7ParseException(ConstantsResource.NoMessageType);
}
// Determine the structure for the indicated message identifier
Type messageStructure = GetMessageStructure(msh.MessageType);
// Create the message and populate all the matching segments into its structure
int segmentIndex = 0;
HL7Message message = BuildSegmentGroup(messageStructure, segments, ref segmentIndex) as HL7Message;
return(message);
}
/// <summary>
/// Creates an HL7 acknowledgement for a received message. If there is an
/// error condition, the acknowledgement will be a negative acknowledgement
/// (code AE), otherwise it will be a positive acknowedgement (code AA).
/// </summary>
/// <param HL7Name="message">The received message</param>
/// <param HL7Name="facility">The facility that is returning the acknowledgement</param>
/// <param HL7Name="application">The application that is returning the acknowledgement</param>
/// <param HL7Name="errorCondition">Null if no error, otherwise a code and description of the error</param>
/// <returns>The HL7 acknowledgement</returns>
public static HL7Acknowledgement Acknowledge(HL7Message message, string facility, string application, CE errorCondition)
{
HL7Acknowledgement ack = new HL7Acknowledgement();
ack.MessageHeader = new MSH();
ack.MessageHeader.FieldSeparator = message.MessageHeader.FieldSeparator;
ack.MessageHeader.EncodingCharacters = message.MessageHeader.EncodingCharacters;
ack.MessageHeader.SendingApplication = new HD()
{
namespaceID = application
};
ack.MessageHeader.SendingFacility = new HD()
{
namespaceID = facility
};
ack.MessageHeader.ReceivingApplication = message.MessageHeader.SendingApplication;
ack.MessageHeader.ReceivingFacility = message.MessageHeader.SendingFacility;
ack.MessageHeader.DateTimeOfMessage = new TS()
{
TimestampValue = DateTime.Now
};
ack.MessageHeader.Security = message.MessageHeader.Security;
ack.MessageHeader.MessageType = message.MessageHeader.MessageType;
ack.MessageHeader.MessageControlID = NewMessageControlID();
ack.MessageHeader.ProcessingID = message.MessageHeader.ProcessingID;
ack.MessageHeader.VersionID = message.MessageHeader.VersionID;
ack.MessageHeader.SequenceNumber = message.MessageHeader.SequenceNumber;
ack.MessageHeader.ContinuationPointer = message.MessageHeader.ContinuationPointer;
ack.MessageHeader.AcceptAcknowledgmentType = message.MessageHeader.AcceptAcknowledgmentType;
ack.MessageHeader.ApplicationAcknowledgmentType = message.MessageHeader.ApplicationAcknowledgmentType;
ack.MessageHeader.CountryCode = message.MessageHeader.CountryCode;
ack.MessageHeader.CharacterSet = message.MessageHeader.CharacterSet;
ack.MessageHeader.PrincipalLanguageOfMessage = message.MessageHeader.PrincipalLanguageOfMessage;
ack.MessageHeader.AltCharsetHandlingScheme = message.MessageHeader.AltCharsetHandlingScheme;
ack.MessageAcknowledgement = new MSA();
if (errorCondition == null)
{
ack.MessageAcknowledgement.AcknowledgmentCode = "AA";
}
else
{
ack.MessageAcknowledgement.AcknowledgmentCode = "AE";
ack.MessageAcknowledgement.ErrorCondition = errorCondition;
}
ack.MessageAcknowledgement.MessageControlID = message.MessageHeader.MessageControlID;
return(ack);
}
