private async Task <TResource> SearchByQueryParameterAsync <TResource>(string queryParameter, CancellationToken cancellationToken)
where TResource : Resource, new()
{
EnsureArg.IsNotNullOrEmpty(queryParameter, nameof(queryParameter));
string fhirTypeName = ModelInfo.GetFhirTypeNameForType(typeof(TResource));
if (!Enum.TryParse(fhirTypeName, out ResourceType resourceType))
{
Debug.Assert(false, "Resource type could not be parsed from TResource");
}
Bundle bundle = await _fhirClient.SearchAsync(
resourceType,
queryParameter,
count : null,
cancellationToken);
int matchCount = 0;
TResource result = null;
while (bundle != null)
{
matchCount += bundle.Entry.Count;
if (matchCount > 1)
{
// Multiple matches.
throw new MultipleMatchingResourcesException(typeof(TResource).Name);
}
else if (bundle?.Entry.Count == 1)
{
// There was only one match but because the server could return empty continuation token
// with more results, we need to follow the links to make sure there are no additional matching resources.
result = (TResource)bundle.Entry[0].Resource;
}
if (bundle.NextLink != null)
{
bundle = await _fhirClient.SearchAsync(bundle.NextLink.ToString(), cancellationToken);
}
else
{
break;
}
}
// Validate to make sure the resource is valid.
if (result != null)
{
_fhirResourceValidator.Validate(result);
}
return(result);
}
private async Task <IEnumerable <TResource> > SearchByQueryParameterAsync <TResource>(string queryParameter, int?maxCount, CancellationToken cancellationToken)
where TResource : Resource, new()
{
EnsureArg.IsNotNullOrEmpty(queryParameter, nameof(queryParameter));
string fhirTypeName = ModelInfo.GetFhirTypeNameForType(typeof(TResource));
if (!Enum.TryParse(fhirTypeName, out ResourceType resourceType))
{
Debug.Assert(false, "Resource type could not be parsed from TResource");
}
Bundle bundle = await _fhirClient.SearchAsync(
resourceType,
queryParameter,
count : null,
cancellationToken);
int matchCount = 0;
var results = new List <TResource>();
while (bundle != null)
{
matchCount += bundle.Entry.Count;
if (matchCount > maxCount)
{
// Multiple matches.
throw new MultipleMatchingResourcesException(typeof(TResource).Name);
}
results.AddRange(bundle.Entry.Select(x => (TResource)x.Resource));
if (bundle.NextLink != null)
{
bundle = await _fhirClient.SearchAsync(bundle.NextLink.ToString(), cancellationToken);
}
else
{
break;
}
}
// Validate to make sure the resource is valid.
foreach (TResource result in results)
{
_fhirResourceValidator.Validate(result);
}
return(results);
}