internal static IGraph CreateUpdateControlledDataset(this SpinWrappedDataset queryModel)
{
IGraph dataset = queryModel._configuration;
IUpdateableStorage storage = queryModel.UnderlyingStorage;
if (!dataset.ContainsTriple(new Triple(RDFUtil.CreateUriNode(dataset.BaseUri), RDF.PropertyType, SD.ClassDataset)) && !dataset.ContainsTriple(new Triple(RDFUtil.CreateUriNode(dataset.BaseUri), RDF.PropertyType, RDFRuntime.ClassUpdateControlledDataset)))
{
throw new Exception("Invalid dataset to operate on : " + dataset.BaseUri.ToString());
}
// TODO ?See whether we should nest "transactions" or not? Currently not
if (dataset.ContainsTriple(new Triple(RDFUtil.CreateUriNode(dataset.BaseUri), RDF.PropertyType, RDFRuntime.ClassUpdateControlledDataset)))
{
return(dataset);
}
// creates the work Dataset
SpinDatasetDescription workingset = new SpinDatasetDescription();
workingset.BaseUri = UriFactory.Create(RDFRuntime.DATASET_NS_URI + Guid.NewGuid().ToString());
workingset.Assert(dataset.Triples);
INode datasetNode = RDFUtil.CreateUriNode(dataset.BaseUri);
INode workingsetNode = RDFUtil.CreateUriNode(workingset.BaseUri);
// adds workingset metadata
workingset.Retract(dataset.GetTriplesWithSubject(datasetNode));
workingset.Assert(workingsetNode, RDFRuntime.PropertyUpdatesGraph, workingsetNode);
workingset.Assert(workingsetNode, RDF.PropertyType, RDFRuntime.ClassUpdateControlledDataset);
workingset.Assert(workingsetNode, RDFRuntime.PropertyUpdatesDataset, datasetNode);
workingset.Assert(workingsetNode, DCTerms.PropertyCreated, DateTime.Now.ToLiteral(RDFUtil.nodeFactory));
queryModel._configuration = workingset;
queryModel.Initialise();
return(workingset);
}
internal static SpinDatasetDescription Load(IUpdateableStorage storage, Uri datasetUri = null, IEnumerable <Uri> graphsUri = null)
{
SpinDatasetDescription dataset;
if (datasetUri == null)
{
SparqlResultSet datasetDiscovery = (SparqlResultSet)storage.Query("SELECT ?dataset WHERE {?dataset a <" + SD.ClassDataset.Uri.ToString() + ">}");
int datasetCount = datasetDiscovery.Results.Count;
if (datasetCount > 1)
{
throw new Exception("More than one dataset has been found in the current storage provider. Please specify which to use through the datasetUri parameter.");
}
else if (datasetCount == 1)
{
datasetUri = ((IUriNode)datasetDiscovery.Results.FirstOrDefault().Value("dataset")).Uri;
}
else
{
datasetUri = UriFactory.Create(RDFRuntime.DATASET_NS_URI + Guid.NewGuid().ToString());
}
}
dataset = new SpinDatasetDescription(datasetUri);
storage.LoadGraph(dataset, datasetUri);
dataset.BaseUri = datasetUri;
Triple isUpdateControlledDataset = dataset.GetTriplesWithPredicate(RDFRuntime.PropertyUpdatesDataset).FirstOrDefault();
if (isUpdateControlledDataset != null)
{
dataset._sourceUri = ((IUriNode)isUpdateControlledDataset.Object).Uri;
}
else
{
dataset.Assert(RDFUtil.CreateUriNode(datasetUri), RDF.PropertyType, SD.ClassDataset);
}
return(dataset);
}
