/// <summary>
/// Gets the message fields with proper field number for MSH.
/// </summary>
/// <param name="MSH Segment">MSH segment string</param>
/// <returns>Split MSH Segment</returns>
private static string[] GetMessageFieldsForMSH(string s)
{
string[] sFieldsPlaceHolder = HL7ToXmlConverter.GetMessgeFields(s);
string[] sFieldsForMSG = new string[sFieldsPlaceHolder.Length + 1];
sFieldsForMSG[0] = sFieldsPlaceHolder[0];
sFieldsForMSG[1] = "|";
for (int x = 2; x < sFieldsForMSG.Length; x++)
{
sFieldsForMSG[x] = sFieldsPlaceHolder[x - 1];
}
return(sFieldsForMSG);
}
/// <summary>
/// Converts an HL7 message into an XML representation of the same message.
/// </summary>
///
/// <param name="sHL7">The HL7 to convert</param>
/// <returns></returns>
public static string ConvertToXml(string sHL7, string validationType)
{
try
{
// Go and create the base XML
_xmlDoc = CreateXmlDoc();
// HL7 message segments are terminated by carriage returns,
// so to get an array of the message segments, split on carriage return
char[] delimiter = { '\r', '\n' };
string[] sHL7Lines = sHL7.Split(delimiter);
// Now we want to replace any other unprintable control
// characters with whitespace otherwise they'll break the XML
int j = -1;
for (int i = 0; i < sHL7Lines.Length; i++)
{
//sHL7Lines[i] = Regex.Replace(sHL7Lines[i], @"[^-~]", " ");
j = sHL7Lines[i].IndexOf(@"<");
}
//Retrieve the field separator
_fieldSeparator = sHL7Lines[0][3];
//Retrieve the encoding characters
_componentSeparator = sHL7Lines[0][4];
_subComponentSeparator = sHL7Lines[0][7];
_repetitionSeparator = '~';
string encodingCharacters = GetEncodingCharacters
(_componentSeparator, _repetitionSeparator, _escapeCharacter, _subComponentSeparator);
/// Go through each segment in the message
/// and first get the fields, separated by pipe (|),
/// then for each of those, check for repetition (~)
/// then get the field components,separated by carat (^)
/// and also check each component for subcomponents.
for (int i = 0; i < sHL7Lines.Length; i++)
{
// Don't care about empty lines
if (sHL7Lines[i] != string.Empty)
{
// Get the line and get the line's segments
string sHL7Line = sHL7Lines[i];
string[] sFields;
// For the first segment(MSG), handle it so that MSG-1 is a pipe(|)
if (i == 0)
{
sFields = HL7ToXmlConverter.GetMessageFieldsForMSH(sHL7Line);
}
else
{
sFields = HL7ToXmlConverter.GetMessgeFields(sHL7Line);
}
if ((sFields[0] == "OBX" && validationType == "Syndromic Surveillance") ||
(sFields[0] == "OBX" && validationType == "Immunization"))
{
sFields[0] = sFields[0] + "-" + GetComponents(sFields[3])[0];
}
if (sFields[0] == "OBX" && validationType == "Lab")
{
// intentionally left blank
}
// Create a new element in the XML for the line
XmlElement el = _xmlDoc.CreateElement(sFields[0]);
_xmlDoc.DocumentElement.AppendChild(el);
// For each field in the line of HL7
for (int a = 0; a < sFields.Length; a++)
{
// Create a new element
/// Part of the HL7 specification is that part
/// of the message header defines which characters
/// are going to be used to delimit the message
/// and since we want to capture the field that
/// contains those characters we need
/// to just capture them and stick them in an element.intrane
if (sFields[a] != encodingCharacters)
{
string[] fieldRepetitions = GetRepetitions(sFields[a]);
if (fieldRepetitions.Length > 1)
{
for (int d = 0; d < fieldRepetitions.Length; d++)
{
if (d == 0)
{
XmlElement fieldEl = _xmlDoc.CreateElement(sFields[0] +
"-" + a.ToString());
string[] sComponents = HL7ToXmlConverter.GetComponents
(fieldRepetitions[d]);
if (sComponents.Length > 1)
{
for (int b = 0; b < sComponents.Length; b++)
{
XmlElement componentEl = _xmlDoc.CreateElement
(sFields[0] + "-" + a.ToString() +
"." + (b + 1).ToString());
string[] subComponents =
GetSubComponents(sComponents[b]);
if (subComponents.Length > 1)
// There were subcomponents
{
for (int c = 0; c < subComponents.Length; c++)
{
XmlElement subComponentEl =
_xmlDoc.CreateElement(sFields[0] + "-" +
a.ToString() + "." +
(b + 1).ToString() + "." + (c + 1).ToString());
subComponentEl.InnerText = subComponents[c];
componentEl.AppendChild(subComponentEl);
}
fieldEl.AppendChild(componentEl);
}
else
{
componentEl.InnerText = sComponents[b];
fieldEl.AppendChild(componentEl);
el.AppendChild(fieldEl);
}
}
el.AppendChild(fieldEl);
}
else
{
fieldEl.InnerText = fieldRepetitions[d];
el.AppendChild(fieldEl);
}
}
else
{
XmlElement fieldEl = _xmlDoc.CreateElement(sFields[0] +
"-" + a.ToString() + "_" + (d + 1).ToString());
string[] sComponents = HL7ToXmlConverter.GetComponents
(fieldRepetitions[d]);
if (sComponents.Length > 1)
{
for (int b = 0; b < sComponents.Length; b++)
{
XmlElement componentEl = _xmlDoc.CreateElement
(fieldEl.Name + "." + (b + 1).ToString());
string[] subComponents = GetSubComponents
(sComponents[b]);
if (subComponents.Length > 1)
{
for (int c = 0; c < subComponents.Length; c++)
{
XmlElement subComponentEl =
_xmlDoc.CreateElement(componentEl.Name +
"." + (c + 1).ToString());
subComponentEl.InnerText = subComponents[c];
componentEl.AppendChild(subComponentEl);
}
fieldEl.AppendChild(componentEl);
}
else
{
componentEl.InnerText = sComponents[b];
fieldEl.AppendChild(componentEl);
el.AppendChild(fieldEl);
}
}
el.AppendChild(fieldEl);
}
else
{
fieldEl.InnerText = fieldRepetitions[d];
el.AppendChild(fieldEl);
}
}
}
}
else
{
XmlElement fieldEl = _xmlDoc.CreateElement(sFields[0] + "-" +
a.ToString());
string[] sComponents = HL7ToXmlConverter.GetComponents(sFields[a]);
if (sComponents.Length > 1)
{
for (int b = 0; b < sComponents.Length; b++)
{
XmlElement componentEl = _xmlDoc.CreateElement(sFields[0] +
"-" + a.ToString() +
"." + (b + 1).ToString());
string[] subComponents = GetSubComponents(sComponents[b]);
if (subComponents.Length > 1)
// There were subcomponents
{
for (int c = 0; c < subComponents.Length; c++)
{
XmlElement subComponentEl =
_xmlDoc.CreateElement(sFields[0] + "-" +
a.ToString() + "." +
(b + 1).ToString() + "." + (c + 1).ToString());
subComponentEl.InnerText = subComponents[c];
componentEl.AppendChild(subComponentEl);
}
fieldEl.AppendChild(componentEl);
}
else
{
componentEl.InnerText = sComponents[b];
fieldEl.AppendChild(componentEl);
el.AppendChild(fieldEl);
}
}
el.AppendChild(fieldEl);
}
else
{
fieldEl.InnerText = sFields[a];
el.AppendChild(fieldEl);
}
}
}
else
{
XmlElement fieldEl = _xmlDoc.CreateElement(sFields[0] + "-" + a.ToString());
fieldEl.InnerText = sFields[a];
el.AppendChild(fieldEl);
}
}
}
}
return(_xmlDoc.OuterXml);
}
catch (Exception ex)
{
ex.Message.ToString();
return(ex.Message.ToString());
}
}
