/// <summary>
/// Processes a Unknown Operator
/// </summary>
/// <param name="algebra">Unknown Operator</param>
/// <param name="context">SPARQL Evaluation Context</param>
public virtual BaseMultiset ProcessUnknownOperator(ISparqlAlgebra algebra, SparqlEvaluationContext context)
{
if (context == null)
{
context = this.GetContext();
}
return(algebra.Evaluate(context));
}
/// <summary>
/// Evalutes an Algebra Operator in this Context using the current Query Processor (if any) or the default <see cref="ISparqlAlgebra.Evaluate">Evaluate()</see> method.
/// </summary>
/// <param name="algebra">Algebra.</param>
/// <returns></returns>
public BaseMultiset Evaluate(ISparqlAlgebra algebra)
{
if (_processor == null)
{
return(algebra.Evaluate(this));
}
else
{
return(_processor.ProcessAlgebra(algebra, this));
}
}
public void SparqlPropertyPathEvaluationInverseNegatedPropertySet()
{
EnsureTestData();
NegatedSet path = new NegatedSet(Enumerable.Empty <Property>(), new Property[] { new Property(this._factory.CreateUriNode(new Uri(RdfSpecsHelper.RdfType))) });
ISparqlAlgebra algebra = this.GetAlgebra(path);
SparqlEvaluationContext context = new SparqlEvaluationContext(null, this._data);
BaseMultiset results = algebra.Evaluate(context);
TestTools.ShowMultiset(results);
Assert.IsFalse(results.IsEmpty, "Results should not be empty");
}
public void SparqlPropertyPathEvaluationZeroLengthWithTermStart()
{
EnsureTestData();
FixedCardinality path = new FixedCardinality(new Property(this._factory.CreateUriNode(new Uri(RdfSpecsHelper.RdfType))), 0);
ISparqlAlgebra algebra = this.GetAlgebra(path, new Graph().CreateUriNode(UriFactory.Create(ConfigurationLoader.ClassHttpHandler)), null);
SparqlEvaluationContext context = new SparqlEvaluationContext(null, this._data);
BaseMultiset results = algebra.Evaluate(context);
TestTools.ShowMultiset(results);
Assert.IsFalse(results.IsEmpty, "Results should not be empty");
}
public void SparqlPropertyPathEvaluationZeroLength()
{
EnsureTestData();
FixedCardinality path =
new FixedCardinality(new Property(this._factory.CreateUriNode(new Uri(RdfSpecsHelper.RdfType))), 0);
ISparqlAlgebra algebra = this.GetAlgebra(path);
SparqlEvaluationContext context = new SparqlEvaluationContext(null, this._data);
BaseMultiset results = algebra.Evaluate(context);
TestTools.ShowMultiset(results);
Assert.False(results.IsEmpty, "Results should not be empty");
}
public void SparqlPropertyPathEvaluationSequencedAlternatives()
{
EnsureTestData();
INode a = this._factory.CreateUriNode(new Uri(RdfSpecsHelper.RdfType));
INode b = this._factory.CreateUriNode(new Uri(NamespaceMapper.RDFS + "range"));
SequencePath path = new SequencePath(new AlternativePath(new Property(a), new Property(b)), new AlternativePath(new Property(a), new Property(a)));
ISparqlAlgebra algebra = this.GetAlgebraUntransformed(path);
SparqlEvaluationContext context = new SparqlEvaluationContext(null, this._data);
BaseMultiset results = algebra.Evaluate(context);
TestTools.ShowMultiset(results);
Assert.IsFalse(results.IsEmpty, "Results should not be empty");
}
public void SparqlPropertyPathEvaluationZeroLengthWithTermEnd()
{
EnsureTestData();
FixedCardinality path = new FixedCardinality(new Property(this._factory.CreateUriNode(new Uri(RdfSpecsHelper.RdfType))), 0);
INode rdfsClass = this._factory.CreateUriNode(new Uri(NamespaceMapper.RDFS + "Class"));
ISparqlAlgebra algebra = this.GetAlgebra(path, null, rdfsClass);
SparqlEvaluationContext context = new SparqlEvaluationContext(null, this._data);
BaseMultiset results = algebra.Evaluate(context);
TestTools.ShowMultiset(results);
Assert.IsFalse(results.IsEmpty, "Results should not be empty");
Assert.AreEqual(1, results.Count, "Expected 1 Result");
Assert.AreEqual(rdfsClass, results[1]["x"], "Expected 1 Result set to rdfs:Class");
}
public void SparqlPropertyPathEvaluationZeroOrMorePath()
{
TripleStore store = new TripleStore();
Graph g = new Graph();
g.LoadFromFile("InferenceTest.ttl");
store.Add(g);
InMemoryDataset dataset = new InMemoryDataset(store, g.BaseUri);
ZeroOrMore path = new ZeroOrMore(new Property(this._factory.CreateUriNode(new Uri(NamespaceMapper.RDFS + "subClassOf"))));
ISparqlAlgebra algebra = this.GetAlgebra(path);
BaseMultiset results = algebra.Evaluate(new SparqlEvaluationContext(null, dataset));
TestTools.ShowMultiset(results);
Assert.IsFalse(results.IsEmpty, "Results should not be empty");
}
public void SparqlPropertyPathEvaluationZeroOrMorePathForward()
{
TripleStore store = new TripleStore();
Graph g = new Graph();
g.LoadFromFile("resources\\InferenceTest.ttl");
store.Add(g);
InMemoryDataset dataset = new InMemoryDataset(store);
ZeroOrMore path =
new ZeroOrMore(new Property(this._factory.CreateUriNode(new Uri(NamespaceMapper.RDFS + "subClassOf"))));
INode sportsCar = this._factory.CreateUriNode(new Uri("http://example.org/vehicles/SportsCar"));
ISparqlAlgebra algebra = this.GetAlgebra(path, sportsCar, null);
BaseMultiset results = algebra.Evaluate(new SparqlEvaluationContext(null, dataset));
TestTools.ShowMultiset(results);
Assert.False(results.IsEmpty, "Results should not be empty");
}
/// <summary>
/// Evalutes an Algebra Operator in this Context using the current Query Processor (if any) or the default <see cref="ISparqlAlgebra.Evaluate">Evaluate()</see> method
/// </summary>
/// <param name="algebra">Algebra</param>
/// <returns></returns>
public BaseMultiset Evaluate(ISparqlAlgebra algebra)
{
if (this._processor == null)
{
return algebra.Evaluate(this);
}
else
{
return this._processor.ProcessAlgebra(algebra, this);
}
}