/// <summary>
/// Validates the HL7 message for basic syntax
/// </summary>
/// <returns>A boolean indicating whether the whole message is valid or not</returns>
private bool validateMessage()
{
try
{
if (!string.IsNullOrEmpty(HL7Message))
{
//check message length - MSH+Delimeters+12Fields in MSH
if (HL7Message.Length < 20)
{
throw new HL7Exception("Message Length too short: " + HL7Message.Length + " chars.", HL7Exception.BAD_MESSAGE);
}
//check if message starts with header segment
if (!HL7Message.StartsWith("MSH"))
{
throw new HL7Exception("MSH segment not found at the beggining of the message", HL7Exception.BAD_MESSAGE);
}
this.Encoding.EvaluateSegmentDelimiter(this.HL7Message);
this.HL7Message = string.Join(this.Encoding.SegmentDelimiter, MessageHelper.SplitMessage(this.HL7Message)) + this.Encoding.SegmentDelimiter;
//check Segment Name & 4th character of each segment
char fourthCharMSH = HL7Message[3];
this.allSegments = MessageHelper.SplitMessage(HL7Message);
foreach (string strSegment in this.allSegments)
{
if (string.IsNullOrWhiteSpace(strSegment))
{
continue;
}
bool isValidSegName = false;
string segmentName = strSegment.Substring(0, 3);
string segNameRegEx = "[A-Z][A-Z][A-Z1-9]";
isValidSegName = System.Text.RegularExpressions.Regex.IsMatch(segmentName, segNameRegEx);
if (!isValidSegName)
{
throw new HL7Exception("Invalid segment name found: " + strSegment, HL7Exception.BAD_MESSAGE);
}
char fourthCharSEG = strSegment[3];
if (fourthCharMSH != fourthCharSEG)
{
throw new HL7Exception("Invalid segment found: " + strSegment, HL7Exception.BAD_MESSAGE);
}
}
string _fieldDelimiters_Message = this.allSegments[0].Substring(3, 8 - 3);
this.Encoding.EvaluateDelimiters(_fieldDelimiters_Message);
// Count field separators, MSH.12 is required so there should be at least 11 field separators in MSH
int countFieldSepInMSH = this.allSegments[0].Count(f => f == Encoding.FieldDelimiter);
if (countFieldSepInMSH < 11)
{
throw new HL7Exception("MSH segment doesn't contain all the required fields", HL7Exception.BAD_MESSAGE);
}
// Find Message Version
var MSHFields = MessageHelper.SplitString(this.allSegments[0], Encoding.FieldDelimiter);
if (MSHFields.Count >= 12)
{
this.Version = MessageHelper.SplitString(MSHFields[11], Encoding.ComponentDelimiter)[0];
}
else
{
throw new HL7Exception("HL7 version not found in the MSH segment", HL7Exception.REQUIRED_FIELD_MISSING);
}
//Find Message Type & Trigger Event
try
{
string MSH_9 = MSHFields[8];
if (!string.IsNullOrEmpty(MSH_9))
{
var MSH_9_comps = MessageHelper.SplitString(MSH_9, this.Encoding.ComponentDelimiter);
if (MSH_9_comps.Count >= 3)
{
this.MessageStructure = MSH_9_comps[2];
}
else if (MSH_9_comps.Count > 0 && MSH_9_comps[0] != null && MSH_9_comps[0].Equals("ACK"))
{
this.MessageStructure = "ACK";
}
else if (MSH_9_comps.Count == 2)
{
this.MessageStructure = MSH_9_comps[0] + "_" + MSH_9_comps[1];
}
else
{
throw new HL7Exception("Message Type & Trigger Event value not found in message", HL7Exception.UNSUPPORTED_MESSAGE_TYPE);
}
}
else
{
throw new HL7Exception("MSH.10 not available", HL7Exception.UNSUPPORTED_MESSAGE_TYPE);
}
}
catch (System.IndexOutOfRangeException e)
{
throw new HL7Exception("Can't find message structure (MSH.9.3) - " + e.Message, HL7Exception.UNSUPPORTED_MESSAGE_TYPE);
}
try
{
this.MessageControlID = MSHFields[9];
if (string.IsNullOrEmpty(this.MessageControlID))
{
throw new HL7Exception("MSH.10 - Message Control ID not found", HL7Exception.REQUIRED_FIELD_MISSING);
}
}
catch (Exception ex)
{
throw new HL7Exception("Error occured while accessing MSH.10 - " + ex.Message, HL7Exception.REQUIRED_FIELD_MISSING);
}
try
{
this.ProcessingID = MSHFields[10];
if (string.IsNullOrEmpty(this.ProcessingID))
{
throw new HL7Exception("MSH.11 - Processing ID not found", HL7Exception.REQUIRED_FIELD_MISSING);
}
}
catch (Exception ex)
{
throw new HL7Exception("Error occured while accessing MSH.11 - " + ex.Message, HL7Exception.REQUIRED_FIELD_MISSING);
}
}
else
{
throw new HL7Exception("No Message Found", HL7Exception.BAD_MESSAGE);
}
}
catch (Exception ex)
{
throw new HL7Exception("Failed to validate the message with error - " + ex.Message, HL7Exception.BAD_MESSAGE);
}
return(true);
}
/// <summary>
/// validates the HL7 message for basic syntax
/// </summary>
/// <returns>boolean</returns>
private bool ValidateMessage()
{
try
{
if (!String.IsNullOrEmpty(HL7Message))
{
HL7Message = HL7Message.Trim(messageTrimChars);
//check message length - MSH+Delemeters+12Fields in MSH
if (HL7Message.Length < 20)
{
throw new HL7Exception("Message Length too short" + HL7Message.Length + " fields.", HL7Exception.BAD_MESSAGE);
}
//check if message starts with header segment
if (!HL7Message.StartsWith("MSH"))
{
throw new HL7Exception("MSH Segment not found at the beggining of the message", HL7Exception.BAD_MESSAGE);
}
//Find segment separator
if (HL7Message.Contains(DefaultSegmentSeparatorString[0]))
{
msgSegmentSeparatorIndex = 0;
}
else if (HL7Message.Contains(DefaultSegmentSeparatorString[1]))
{
msgSegmentSeparatorIndex = 1;
}
else
{
msgSegmentSeparatorIndex = 0;
}
//check Segment Name & 4th character of each segment
char fourthCharMSH = HL7Message[3];
AllSegments = MessageHelper.SplitString(HL7Message, new Char[1] {
DefaultSegmentSeparatorString[msgSegmentSeparatorIndex]
});
foreach (String strSegment in AllSegments)
{
bool isValidSegName = false;
String segmentName = strSegment.Substring(0, 3);
String segNameRegEx = "[A-Z][A-Z][A-Z1-9]";
isValidSegName = System.Text.RegularExpressions.Regex.IsMatch(segmentName, segNameRegEx);
if (!isValidSegName)
{
throw new HL7Exception("Invalid Segment Name Found :" + strSegment, HL7Exception.BAD_MESSAGE);
}
char fourthCharSEG = strSegment[3];
if (fourthCharMSH != fourthCharSEG)
{
throw new HL7Exception("Invalid Segment Found :" + strSegment, HL7Exception.BAD_MESSAGE);
}
}
Char[] _fieldDelimiters_Message = AllSegments[0].Substring(3, 8 - 3).ToArray <Char>();
FieldDelimiters = _fieldDelimiters_Message;
//count field separators, MSH.12 is required so there should be at least 11 field separators in MSH
int countFieldSepInMSH = AllSegments[0].Count(f => f == FieldDelimiters[0]);
if (countFieldSepInMSH < 11)
{
throw new HL7Exception("MSH segment doesn't contain all required fields", HL7Exception.BAD_MESSAGE);
}
//Find Message Version
char[] fieldSeparator = new char[1] {
FieldDelimiters[0]
};
char[] componentSeparator = new char[1] {
FieldDelimiters[1]
};
List <String> MSHFields = AllSegments[0].Split(fieldSeparator, StringSplitOptions.None).ToList <String>();
if (MSHFields.Count >= 12)
{
this._Version = MSHFields[11].Split(componentSeparator, StringSplitOptions.None)[0];
}
else
{
throw new HL7Exception("HL7 version not found in MSH Segment", HL7Exception.REQUIRED_FIELD_MISSING);
}
//Find Message Type & Trigger Event
try
{
String MSH_9 = MSHFields[8];
if (!String.IsNullOrEmpty(MSH_9))
{
System.String[] MSH_9_comps = MSH_9.Split(componentSeparator, StringSplitOptions.None);
if (MSH_9_comps.Length >= 3)
{
this._MessageStructure = MSH_9_comps[2];
}
else if (MSH_9_comps.Length > 0 && MSH_9_comps[0] != null && MSH_9_comps[0].Equals("ACK"))
{
this._MessageStructure = "ACK";
}
else if (MSH_9_comps.Length == 2)
{
this._MessageStructure = MSH_9_comps[0] + "_" + MSH_9_comps[1];
}
else
{
throw new HL7Exception("Message Type & Trigger Event value not found in message", HL7Exception.UNSUPPORTED_MESSAGE_TYPE);
}
}
else
{
throw new HL7Exception("MSH.10 not available", HL7Exception.UNSUPPORTED_MESSAGE_TYPE);
}
}
catch (System.IndexOutOfRangeException e)
{
throw new HL7Exception("Can't find message structure (MSH.9.3) - " + e.Message, HL7Exception.UNSUPPORTED_MESSAGE_TYPE);
}
try
{
this._MessageControlID = MSHFields[9];
if (String.IsNullOrEmpty(this._MessageControlID))
{
throw new HL7Exception("MSH.10 - Message Control ID not found", HL7Exception.REQUIRED_FIELD_MISSING);
}
}
catch (Exception ex)
{
throw new HL7Exception("Error occured while accessing MSH.10 - " + ex.Message, HL7Exception.REQUIRED_FIELD_MISSING);
}
try
{
this._ProcessingID = MSHFields[10];
if (String.IsNullOrEmpty(this._ProcessingID))
{
throw new HL7Exception("MSH.11 - Processing ID not found", HL7Exception.REQUIRED_FIELD_MISSING);
}
}
catch (Exception ex)
{
throw new HL7Exception("Error occured while accessing MSH.11 - " + ex.Message, HL7Exception.REQUIRED_FIELD_MISSING);
}
}
else
{
throw new HL7Exception("No Message Found", HL7Exception.BAD_MESSAGE);
}
}
catch (Exception ex)
{
throw new HL7Exception("Failed to validate the message with error - " + ex.Message, HL7Exception.BAD_MESSAGE);
}
return(true);
}