/// <summary>
/// Parses a bindeable type (code, Coding, CodeableConcept, Quantity, string, uri) into a FHIR coded datatype.
/// Extensions will be parsed from the 'value' of the (simple) extension.
/// </summary>
/// <param name="instance"></param>
/// <returns>An Element of a coded type (code, Coding or CodeableConcept) dependin on the instance type,
/// or null if no bindable instance data was found</returns>
/// <remarks>The instance type is mapped to a codable type as follows:
/// 'code' => code
/// 'Coding' => Coding
/// 'CodeableConcept' => CodeableConcept
/// 'Quantity' => Coding
/// 'Extension' => depends on value[x]
/// 'string' => code
/// 'uri' => code
/// </remarks>
public static Element ParseBindable(this IElementNavigator instance)
{
var instanceType = ModelInfo.FhirTypeNameToFhirType(instance.Type);
switch (instanceType)
{
case FHIRDefinedType.Code:
return(instance.ParsePrimitive <Code>());
case FHIRDefinedType.Coding:
return(instance.ParseCoding());
case FHIRDefinedType.CodeableConcept:
return(instance.ParseCodeableConcept());
case FHIRDefinedType.Quantity:
return(parseQuantity(instance));
case FHIRDefinedType.String:
return(new Code(instance.ParsePrimitive <FhirString>()?.Value));
case FHIRDefinedType.Uri:
return(new Code(instance.ParsePrimitive <FhirUri>()?.Value));
case FHIRDefinedType.Extension:
return(parseExtension(instance));
case null:
//HACK: fall through - IElementNav did not provide a type
//should not happen, and I have no intention to handle it.
default:
// Not bindable
return(null);
}
Coding parseQuantity(IElementNavigator nav)
{
var newCoding = new Coding();
var q = instance.ParseQuantity();
newCoding.Code = q.Unit;
newCoding.System = q.System ?? "http://unitsofmeasure.org";
return(newCoding);
}
Element parseExtension(IElementNavigator nav)
{
// HACK: For now, assume this is a typed navigator, so we have "value",
// not the unparsed "valueCode" etc AND we have Type (in ParseBindable())
var valueChild = instance.Children("value").FirstOrDefault();
if (valueChild != null)
{
return(valueChild.ParseBindable());
}
else
{
return(null);
}
}
}