public async Task <IActionResult> PostPredicate(NamedPredicateVm namedPredicateVm)
{
Parameters parameters =
_parametersProcessorService.ProcessParameters(Request.RouteValues, Request.QueryString);
string?query = _sparqlFactoryService.GetFinalPostQueryForPredicate(parameters, namedPredicateVm);
if (query != null)
{
bool successful = await _endpointService.ExecuteUpdateSparqlQueryAsync(
parameters.RouteParameters.Endpoint,
parameters.RouteParameters.Graph, query);
if (successful)
{
return(Created(new Uri(Request.GetEncodedUrl() + "/" + namedPredicateVm.PredicateCurie), namedPredicateVm));
}
}
return(BadRequest(new ValidationErrorVm()
{
CustomError = new CustomErrorVm()
{
CustomErrorMessage =
$"Predicate could not have been created! Check selected endpoint configuration at {UrlHelperClass.GetEndpointUrl(Request.GetEncodedUrl())}.",
GeneratedQuery = query
}
}));
}
public string?GetFinalPostQueryForPredicate(Parameters parameters, NamedPredicateVm namedPredicateVm)
{
string resourceCurie = parameters.RouteParameters.Resource;
string predicateCurie = namedPredicateVm.PredicateCurie;
if (_namespaceFactoryService.GetAbsoluteUriFromQname(resourceCurie, out string resourceAbsoluteUri) &&
_namespaceFactoryService.GetAbsoluteUriFromQname(predicateCurie, out string predicateAbsoluteUri))
{
string?insertQuery =
ConstructInsertPredicateQueryString(namedPredicateVm, resourceAbsoluteUri, predicateAbsoluteUri);
if (string.IsNullOrEmpty(insertQuery))
{
return(null);
}
insertQuery = ImplementFromGraphClauseToInsertDeleteQuery(insertQuery, parameters);
return(insertQuery);
}
return(null);
}