/// <summary>
/// GetHeader
/// Build the hl7 message header (MSH)
/// Each HL7 object contains a list of errors.
/// Verify no errors have been detected during processing
/// </summary>
/// <param name="hl7Msg">hl7 message</param>
/// <returns>HL7Header object</returns>
public HL7Header GetHeader(List <string> hl7Msg)
{
HL7Encoding hl7Encoding = null;
MSH msh = null;
NTE nte = null;
bool bMSHFound = false;
List <NTE> notes = new List <NTE>();
List <ErrorMsg> lErrorMsg = new List <ErrorMsg>();
string line = string.Empty;
try
{
// search for the MSH segment should be the first one
// any following NTE at the top level we need to keep with the MSH Header object
for (int nIdx = 0; nIdx < hl7Msg.Count; nIdx++)
{
line = hl7Msg[nIdx].ToString(); // index 0 must be the MSH segment
if (line.Substring(0, 3).Equals("MSH"))
{
// ok we have a Message Header line
// now lets get the decoding informaiton
hl7Encoding = new HL7Encoding((line.Substring(3, 5)).ToCharArray());
}
else
{
continue; // not found get next line
}
string sTmp = GetField(hl7Encoding, line, 0); // should be the message segment
if (string.IsNullOrEmpty(sTmp))
{
lErrorMsg.Add(new ErrorMsg(1, line));
}
else
{
// Enum.TryParse<Segments>(sTmp, out sResult);
switch (((Segments)Enum.Parse(typeof(Segments), sTmp)))
{
case Segments.MSH:
msh = new BuildMSH().GetMSH(hl7Encoding, line);
bMSHFound = true;
break;
case Segments.NTE: // can be more than one
if (bMSHFound) // only keep NTE segments on this level
{
nte = new BuildNTE().GetNTE(hl7Encoding, line);
notes.Add(nte);
}
break;
default:
nIdx = hl7Msg.Count; // we are done, leave
break;
}
}
}
}
catch (Exception ex)
{
string sErr = string.Format("GetHeader:GetHeader: Exception {0}", ex);
msh.Errors.Add(sErr);
Console.WriteLine(sErr);
}
return(new HL7Header(msh, notes, hl7Encoding));
}
/// <summary>
/// GetOrders - get all the segments that make up an order
/// {
/// ORC - Required (Order)
/// [
/// OBR - Required
/// [{NTE}] - Optional, if present can repeat
/// [{DG1}] - Optional, if present can repeat
/// [{
/// OBX - Required
/// [{NTE}] - Optional, if present can repeat
/// }]
/// ]
/// [{CTI}] - Optional, if present can repeat
/// [BLG] - Optional
/// }
///
/// </summary>
/// <param name="hl7Msg">HL7 ORM message</param>
/// <returns>List<HL7Orders> object</returns>
public List <HL7Order> GetOrders(HL7Encoding _encode, List <string> hl7Msg)
{
HL7Order order = null;
HL7Details od = null;
HL7Observation obs = null;
List <HL7Order> hl7Orders = new List <HL7Order>();
BuildOrders bldOrders = new BuildOrders();
BuildNTE bldNTE = new BuildNTE();
ErrorMsg errorMsg = new ErrorMsg();
List <ErrorMsg> lErrorMsg = new List <ErrorMsg>();
string line = string.Empty;
bool bOrder = false; // order
bool bOrderDetails = false; // order details
bool bObservation = false; // observation
try
{
// search for the ORC segment
for (int nIdx = 0; nIdx < hl7Msg.Count; nIdx++)
{
line = hl7Msg[nIdx].ToString();
string sTmp = GetField(_encode, line, 0);
if (string.IsNullOrEmpty(sTmp))
{
lErrorMsg.Add(new ErrorMsg(1, line));
}
else
{
// Enum.TryParse<Segments>(sTmp, out sResult);
switch (((Segments)Enum.Parse(typeof(Segments), sTmp)))
{
case Segments.ORC: // start HL7 order
if (order != null)
{
if (bOrderDetails)
{
if (bObservation)
{
if (obs != null)
{
od.Observations.Add(obs);
obs = null;
}
bObservation = false;
}
if (od != null)
{
order.HL7Details.Add(od);
od = null;
}
bOrderDetails = false;
}
// we are working on a current order and a new order was found
// we need to add the existing order to the array
// create new order and start again
hl7Orders.Add(order);
order = null;
}
// lets start again
order = new HL7Order
{
ORCSegment = new BuildORC().GetORC(_encode, line) // build ORC object
};
bOrder = true; // working on new order
bOrderDetails = false;
bObservation = false;
break;
case Segments.OBR: // order details
if (od != null)
{
// already building Order Detail object
// new message found add existing order detial and start again
order.HL7Details.Add(od);
od = null;
}
od = new HL7Details("ORM")
{
OBRSegment = new BuildOBR().GetOBR(_encode, line)
};
bOrderDetails = true;
bObservation = false;
break;
case Segments.DG1: // order details
od.DG1Segments.Add(new BuildDG1().GetDG1(_encode, line));
bObservation = false;
break;
// Observations consist of OBX, NTE
case Segments.OBX: // Observations
if (obs != null)
{
od.Observations.Add(obs);
obs = null;
}
obs = new HL7Observation("ORM")
{
OBXSegment = new BuildOBX().GetOBX(_encode, line, "ORM")
};
bObservation = true;
break;
case Segments.NTE:
// note the order of the if statements matter.
// Observations than orderDetails than order
if (bObservation) // NTE for Observations
{
obs.NTESegments.Add(bldNTE.GetNTE(_encode, line)); // build NTE for OBR group
}
else if (bOrderDetails) // NTE for Order details
{
od.NTESegments.Add(bldNTE.GetNTE(_encode, line)); // build NTE for OBR group
}
else if (bOrder) // NTE for Order
{
order.NTESegments.Add(bldNTE.GetNTE(_encode, line)); // build NTE for ORC group
}
break;
case Segments.BLG:
order.BLGSegment = new BuildBLG().GetBLG(_encode, line); // build BLG
break;
case Segments.CTI:
order.CTISegments.Add(new BuildCTI().GetCTI(_encode, line)); // build CT1
break;
default:
// nIdx = hl7Msg.Count; // we are done, leave
break;
}
}
}
// we need to finish what we stated
if (bOrder)
{
if (order != null)
{
if (bOrderDetails)
{
if (bObservation)
{
if (obs != null)
{
od.Observations.Add(obs);
obs = null;
}
bObservation = false;
}
if (od != null)
{
order.HL7Details.Add(od);
od = null;
}
bOrderDetails = false;
}
// we are working on a current order and a new order was found
// we need to add the existing order to the array
// create new order and start again
hl7Orders.Add(order);
order = null;
}
}
}
catch (Exception ex)
{
string sErr = string.Format("BuildOrders:GetOrders: Exception {0}", ex);
errorMsg.Message = sErr;
Console.WriteLine(sErr);
}
return(hl7Orders);
}
/// <summary>
/// GetResults - get the HL7Result object based on the hl7 message
/// </summary>
/// <param name="_encode"></param>
/// <param name="hl7Msg"></param>
/// <returns></returns>
public List <HL7Results> GetResults(HL7Encoding _encode, List <string> hl7Msg)
{
HL7Results result = null;
HL7Details od = null;
HL7Observation obs = null;
List <HL7Results> hl7Results = new List <HL7Results>();
BuildResults bldResult = new BuildResults();
BuildNTE bldNTE = new BuildNTE();
var errorMsg = new ErrorMsg();
List <ErrorMsg> lErrorMsg = new List <ErrorMsg>();
string line = string.Empty;
bool bResult = false; // result
bool bResultDetails = false; // result details
bool bObservation = false; // observation
try
{
// search for the ORC segment
for (int nIdx = 0; nIdx < hl7Msg.Count; nIdx++)
{
line = hl7Msg[nIdx].ToString();
string sTmp = GetField(_encode, line, 0);
if (string.IsNullOrEmpty(sTmp))
{
lErrorMsg.Add(new ErrorMsg(1, line));
}
else
{
// Enum.TryParse<Segments>(sTmp, out sResult);
switch (((Segments)Enum.Parse(typeof(Segments), sTmp)))
{
case Segments.ORC: // start HL7 order
if (result != null)
{
if (bResultDetails)
{
if (bObservation)
{
if (obs != null)
{
od.Observations.Add(obs);
obs = null;
}
bObservation = false;
}
if (od != null)
{
result.HL7Details.Add(od);
od = null;
}
bResultDetails = false;
}
// we are working on a current order and a new order was found
// we need to add the existing order to the array
// create new order and start again
hl7Results.Add(result);
result = null;
}
// lets start again
result = new HL7Results
{
ORCSegment = new BuildORC().GetORC(_encode, line) // build ORC object
};
bResult = true; // working on new order
bResultDetails = false;
bObservation = false;
break;
case Segments.OBR: // order details
if (od != null)
{
// already building Order Detail object
// new message found add existing order detial and start again
result.HL7Details.Add(od);
od = null;
}
od = new HL7Details("ORU")
{
OBRSegment = new BuildOBR().GetOBR(_encode, line)
};
bResultDetails = true;
bObservation = false;
break;
// Observations consist of OBX, NTE
case Segments.OBX: // Observations
if (obs != null)
{
od.Observations.Add(obs);
obs = null;
}
obs = new HL7Observation("ORU")
{
OBXSegment = new BuildOBX().GetOBX(_encode, line, "ORU")
};
bObservation = true;
// if ("ED".Equals(obs.OBXSegment.ValueType))
// {
// // this is the Embedded PDF segment so lets end this
// bObservation = true;
// }
break;
case Segments.NTE:
// Note the order matters keep this order
//
if (bObservation) // NTE for Observations
{
obs.NTESegments.Add(bldNTE.GetNTE(_encode, line)); // build NTE for OBR group
}
else if (bResultDetails) // NTE for Order details
{
od.NTESegments.Add(bldNTE.GetNTE(_encode, line)); // build NTE for OBR group
}
else if (bResult) // NTE for Order
{
result.NTESegments.Add(bldNTE.GetNTE(_encode, line)); // build NTE for ORC group
}
break;
default:
// nIdx = hl7Msg.Count; // we are done, leave
break;
}
}
}
// we need to finish what we stated
if (bResult)
{
if (result != null)
{
if (bResultDetails)
{
if (bObservation)
{
if (obs != null)
{
od.Observations.Add(obs);
obs = null;
}
bObservation = false;
}
if (od != null)
{
result.HL7Details.Add(od);
od = null;
}
bResultDetails = false;
}
// we are working on a current order and a new order was found
// we need to add the existing order to the array
// create new order and start again
hl7Results.Add(result);
result = null;
}
}
}
catch (Exception ex)
{
string sErr = string.Format("BuildResults:GetResults: Exception {0}", ex);
errorMsg.Message = sErr;
Console.WriteLine(sErr);
}
return(hl7Results);
}
