/// <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);
}
}
/// <summary>
/// Flushes any outstanding changes to the underlying dataset.
/// </summary>
public void Flush()
{
if (!_canCommit)
{
throw new SparqlUpdateException("Unable to commit since one/more Commands executed in the current Transaction failed");
}
_dataset.Flush();
}
/// <summary>
/// Saves a Graph to the Store.
/// </summary>
/// <param name="g">Graph.</param>
public override void SaveGraph(IGraph g)
{
if (_dataset.HasGraph(g.BaseUri))
{
_dataset.RemoveGraph(g.BaseUri);
}
_dataset.AddGraph(g);
_dataset.Flush();
}
/// <summary>
/// Creates a new Leviathan Update Processor.
/// </summary>
/// <param name="data">SPARQL Dataset.</param>
public LeviathanUpdateProcessor(ISparqlDataset data)
{
_dataset = data;
if (!_dataset.HasGraph(null))
{
// Create the Default unnamed Graph if it doesn't exist and then Flush() the change
_dataset.AddGraph(new Graph());
_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>
/// Flushes any changes to the dataset.
/// </summary>
public virtual void Flush()
{
_dataset.Flush();
}
