/// <summary>
/// Gets the direct (rdf:type) and indirect (rdfs:subClassOf) instances of the given class within the given data graph
/// </summary>
internal static List <RDFPatternMember> GetInstancesOfClass(this RDFGraph dataGraph, RDFResource className, HashSet <long> visitContext = null)
{
var result = new List <RDFPatternMember>();
if (className != null && dataGraph != null)
{
#region visitContext
if (visitContext == null)
{
visitContext = new HashSet <long>()
{
{ className.PatternMemberID }
};
}
else
{
if (!visitContext.Contains(className.PatternMemberID))
{
visitContext.Add(className.PatternMemberID);
}
else
{
return(result);
}
}
#endregion
//rdf:type
foreach (var triple in dataGraph.SelectTriplesByPredicate(RDFVocabulary.RDF.TYPE)
.SelectTriplesByObject(className))
{
result.Add(triple.Subject);
}
//rdfs:subClassOf
foreach (var triple in dataGraph.SelectTriplesByPredicate(RDFVocabulary.RDFS.SUB_CLASS_OF)
.SelectTriplesByObject(className))
{
result.AddRange(dataGraph.GetInstancesOfClass((RDFResource)triple.Subject, visitContext));
}
}
return(result);
}
/// <summary>
/// Evaluates this constraint against the given data graph
/// </summary>
internal override RDFValidationReport ValidateConstraint(RDFShapesGraph shapesGraph, RDFGraph dataGraph, RDFShape shape, RDFPatternMember focusNode, List <RDFPatternMember> valueNodes)
{
RDFValidationReport report = new RDFValidationReport();
List <RDFPatternMember> classInstances = dataGraph.GetInstancesOfClass(this.ClassType);
#region Evaluation
foreach (RDFPatternMember valueNode in valueNodes)
{
switch (valueNode)
{
//Resource
case RDFResource valueNodeResource:
if (!classInstances.Any(x => x.Equals(valueNodeResource)))
{
report.AddResult(new RDFValidationResult(shape,
RDFVocabulary.SHACL.CLASS_CONSTRAINT_COMPONENT,
focusNode,
shape is RDFPropertyShape ? ((RDFPropertyShape)shape).Path : null,
valueNode,
shape.Messages,
shape.Severity));
}
break;
//Literal
case RDFLiteral valueNodeLiteral:
report.AddResult(new RDFValidationResult(shape,
RDFVocabulary.SHACL.CLASS_CONSTRAINT_COMPONENT,
focusNode,
shape is RDFPropertyShape ? ((RDFPropertyShape)shape).Path : null,
valueNode,
shape.Messages,
shape.Severity));
break;
}
}
#endregion
return(report);
}
/// <summary>
/// Gets the focus nodes of the given shape
/// </summary>
internal static List <RDFPatternMember> GetFocusNodesOf(this RDFGraph dataGraph, RDFShape shape)
{
List <RDFPatternMember> result = new List <RDFPatternMember>();
if (shape != null && dataGraph != null)
{
foreach (RDFTarget target in shape.Targets)
{
switch (target)
{
//sh:targetClass
case RDFTargetClass targetClass:
result.AddRange(dataGraph.GetInstancesOfClass(target.TargetValue)
.OfType <RDFResource>());
break;
//sh:targetNode
case RDFTargetNode targetNode:
result.Add(target.TargetValue);
break;
//sh:targetSubjectsOf
case RDFTargetSubjectsOf targetSubjectsOf:
result.AddRange(dataGraph.SelectTriplesByPredicate(target.TargetValue)
.Select(x => x.Subject)
.OfType <RDFResource>());
break;
//sh:targetObjectsOf
case RDFTargetObjectsOf targetObjectsOf:
result.AddRange(dataGraph.SelectTriplesByPredicate(target.TargetValue)
.Select(x => x.Object)
.OfType <RDFResource>());
break;
}
}
}
return(RDFQueryUtilities.RemoveDuplicates(result));
}