/// <summary>
/// Adds a Graph to the Collection.
/// </summary>
/// <param name="g">Graph to add.</param>
/// <param name="mergeIfExists">Whether to merge the given Graph with any existing Graph with the same URI.</param>
/// <exception cref="RdfException">Thrown if a Graph with the given URI already exists and the <paramref name="mergeIfExists">mergeIfExists</paramref> is set to false.</exception>
protected internal override bool Add(IGraph g, bool mergeIfExists)
{
if (Contains(g.BaseUri))
{
if (mergeIfExists)
{
IGraph temp = _dataset.GetModifiableGraph(g.BaseUri);
temp.Merge(g);
temp.Dispose();
_dataset.Flush();
return(true);
}
else
{
throw new RdfException("Cannot add this Graph as a Graph with the URI '" + g.BaseUri.ToSafeString() + "' already exists in the Collection and mergeIfExists was set to false");
}
}
else
{
// Safe to add a new Graph
if (_dataset.AddGraph(g))
{
_dataset.Flush();
RaiseGraphAdded(g);
return(true);
}
return(false);
}
}
private void TestDeleteDataThenInsertDataRollback()
{
ISparqlDataset dataset = this.GetNonEmptyDataset();
IGraph g = dataset.GetModifiableGraph(TestGraphUri);
g.Assert(new Triple(g.CreateUriNode(new Uri("ex:subj")), g.CreateUriNode(new Uri("ex:pred")), g.CreateUriNode(new Uri("ex:obj"))));
String updates = "DELETE DATA { GRAPH <" + TestGraphUri.ToString() + "> { <ex:subj> <ex:pred> <ex:obj> } }; INSERT DATA { GRAPH <" + TestGraphUri.ToString() + "> { <ex:subj> <ex:pred> <ex:obj> } }; CREATE GRAPH <" + TestGraphUri.ToString() + ">";
SparqlUpdateCommandSet cmds = this._parser.ParseFromString(updates);
LeviathanUpdateProcessor processor = new LeviathanUpdateProcessor(dataset);
try
{
processor.ProcessCommandSet(cmds);
Assert.True(false, "Did not thrown a SparqlUpdateException as expected");
}
catch (SparqlUpdateException upEx)
{
TestTools.ReportError("Update Exception", upEx);
}
Assert.False(dataset[TestGraphUri].IsEmpty, "Graph should not be empty as the Discard() should reverse first the insert then the delete so the end results should be the triple still being in the Graph");
}
/// <summary>
/// Updates a Graph in the Store.
/// </summary>
/// <param name="graphUri">URI of the Graph to Update.</param>
/// <param name="additions">Triples to be added.</param>
/// <param name="removals">Triples to be removed.</param>
public override void UpdateGraph(Uri graphUri, IEnumerable <Triple> additions, IEnumerable <Triple> removals)
{
if (!_dataset.HasGraph(graphUri))
{
Graph temp = new Graph();
temp.BaseUri = graphUri;
_dataset.AddGraph(temp);
}
if ((additions != null && additions.Any()) || (removals != null && removals.Any()))
{
IGraph g = _dataset.GetModifiableGraph(graphUri);
if (additions != null && additions.Any())
{
g.Assert(additions.ToList());
}
if (removals != null && removals.Any())
{
g.Retract(removals.ToList());
}
}
_dataset.Flush();
}
private void TestDeleteDataThenInsertDataCommit()
{
ISparqlDataset dataset = this.GetNonEmptyDataset();
IGraph g = dataset.GetModifiableGraph(TestGraphUri);
g.Assert(new Triple(g.CreateUriNode(new Uri("ex:subj")), g.CreateUriNode(new Uri("ex:pred")), g.CreateUriNode(new Uri("ex:obj"))));
dataset.Flush();
String updates = "DELETE DATA { GRAPH <" + TestGraphUri.ToString() + "> { <ex:subj> <ex:pred> <ex:obj> } }; INSERT DATA { GRAPH <" + TestGraphUri.ToString() + "> { <ex:subj> <ex:pred> <ex:obj> } }";
SparqlUpdateCommandSet cmds = this._parser.ParseFromString(updates);
LeviathanUpdateProcessor processor = new LeviathanUpdateProcessor(dataset);
processor.ProcessCommandSet(cmds);
Assert.False(dataset[TestGraphUri].IsEmpty, "Graph should not be empty as the Flush() should persist first the delete then the insert so the end results should be the triple still being in the Graph");
}
/// <summary>
/// Gets a modifiable graph from the dataset.
/// </summary>
/// <param name="graphUri">Graph URI.</param>
/// <returns></returns>
public virtual IGraph GetModifiableGraph(Uri graphUri)
{
return(_dataset.GetModifiableGraph(graphUri));
}
