/// <inheritdoc/>
public async Task <FhirTransactionRequestEntry> BuildAsync(FhirTransactionContext context, CancellationToken cancellationToken)
{
EnsureArg.IsNotNull(context, nameof(context));
EnsureArg.IsNotNull(context.ChangeFeedEntry, nameof(context.ChangeFeedEntry));
ChangeFeedEntry changeFeedEntry = context.ChangeFeedEntry;
Identifier imagingStudyIdentifier = ImagingStudyIdentifierUtility.CreateIdentifier(changeFeedEntry.StudyInstanceUid);
ImagingStudy imagingStudy = await _fhirService.RetrieveImagingStudyAsync(imagingStudyIdentifier, cancellationToken);
// Returns null if imagingStudy does not exists for given studyInstanceUid
if (imagingStudy == null)
{
return(null);
}
string imagingStudySource = imagingStudy.Meta.Source;
ImagingStudy.SeriesComponent series = ImagingStudyPipelineHelper.GetSeriesWithinAStudy(changeFeedEntry.SeriesInstanceUid, imagingStudy.Series);
ImagingStudy.InstanceComponent instance = ImagingStudyPipelineHelper.GetInstanceWithinASeries(changeFeedEntry.SopInstanceUid, series);
// Return null if the given instance is not present in ImagingStudy
if (instance == null)
{
return(null);
}
// Removes instance from series collection
series.Instance.Remove(instance);
// Removes series from ImagingStudy if its instance collection is empty
if (series.Instance.Count == 0)
{
imagingStudy.Series.Remove(series);
}
if (imagingStudy.Series.Count == 0 && _dicomWebEndpoint.Equals(imagingStudySource, System.StringComparison.Ordinal))
{
return(new FhirTransactionRequestEntry(
FhirTransactionRequestMode.Delete,
ImagingStudyPipelineHelper.GenerateDeleteRequest(imagingStudy),
imagingStudy.ToServerResourceId(),
imagingStudy));
}
return(new FhirTransactionRequestEntry(
FhirTransactionRequestMode.Update,
ImagingStudyPipelineHelper.GenerateUpdateRequest(imagingStudy),
imagingStudy.ToServerResourceId(),
imagingStudy));
}
