/// <summary> Extracts selected fields from a message.
///
/// </summary>
/// <param name="theMessageText">an unparsed message from which to get fields
/// </param>
/// <param name="thePathSpecs">Terser-like paths to fields in the message. See documentation
/// for Terser. These paths are identical except that they start with the segment
/// name (search flags and group names are to be omitted as they are not relevant
/// with unparsed ER7 messages).
/// </param>
/// <returns> field values corresponding to the given paths
/// </returns>
/// <throws> HL7Exception </throws>
public static System.String[] getFields(System.String theMessageText, System.String[] thePathSpecs)
{
NuGenDatumPath[] paths = new NuGenDatumPath[thePathSpecs.Length];
for (int i = 0; i < thePathSpecs.Length; i++)
{
SupportClass.Tokenizer tok = new SupportClass.Tokenizer(thePathSpecs[i], "-", false);
System.String segSpec = tok.NextToken();
tok = new SupportClass.Tokenizer(segSpec, "()", false);
System.String segName = tok.NextToken();
if (segName.Length != 3)
{
throw new NuGenHL7Exception("In field path, " + segName + " is not a valid segment name");
}
int segRep = 0;
if (tok.HasMoreTokens())
{
System.String rep = tok.NextToken();
try
{
segRep = System.Int32.Parse(rep);
}
catch (System.FormatException e)
{
throw new NuGenHL7Exception("In field path, segment rep" + rep + " is not valid", e);
}
}
int[] indices = Terser.getIndices(thePathSpecs[i]);
paths[i] = new NuGenDatumPath();
paths[i].add(segName).add(segRep);
paths[i].add(indices[0]).add(indices[1]).add(indices[2]).add(indices[3]);
}
return(getFields(theMessageText, paths));
}