/// <summary>
/// Enlists the skos:exactMatch concepts of the given concept within the given scheme
/// </summary>
public static RDFSKOSConceptScheme GetExactMatchConceptsOf(this RDFSKOSConceptScheme conceptScheme,
RDFSKOSConcept concept)
{
var result = new RDFSKOSConceptScheme((RDFResource)conceptScheme.Value);
if (concept != null && conceptScheme != null)
{
result = conceptScheme.GetExactMatchConceptsOfInternal(concept, null)
.RemoveConcept(concept); //Safety deletion
}
return(result);
}
/// <summary>
/// Subsumes the "skos:exactMatch" taxonomy to discover direct and indirect exactmatches of the given concept
/// </summary>
internal static RDFSKOSConceptScheme GetExactMatchConceptsOfInternal(this RDFSKOSConceptScheme conceptScheme,
RDFSKOSConcept concept,
Dictionary <long, RDFSKOSConcept> visitContext)
{
var result = new RDFSKOSConceptScheme((RDFResource)conceptScheme.Value);
#region visitContext
if (visitContext == null)
{
visitContext = new Dictionary <long, RDFSKOSConcept>()
{
{ concept.PatternMemberID, concept }
};
}
else
{
if (!visitContext.ContainsKey(concept.PatternMemberID))
{
visitContext.Add(concept.PatternMemberID, concept);
}
else
{
return(result);
}
}
#endregion
// Transitivity of "skos:exactMatch" taxonomy:
//((A SKOS:EXACTMATCH B) && (B SKOS:EXACTMATCH C)) => (A SKOS:EXACTMATCH C)
foreach (var em in conceptScheme.Relations.ExactMatch.SelectEntriesBySubject(concept))
{
result.AddConcept((RDFSKOSConcept)em.TaxonomyObject);
result = result.UnionWith(conceptScheme.GetExactMatchConceptsOfInternal((RDFSKOSConcept)em.TaxonomyObject, visitContext));
}
return(result);
}