private object ProcessNode(NavigationPropertyNode navigation)
{
var source = navigation.Source == null ? _entitySetVariable : ProcessNode(navigation.Source);
if (source != null)
{
IPatternItem sourcePatternItem =
source is Uri ? (IPatternItem) new UriPatternItem(source.ToString()) : new VariablePatternItem(source.ToString());
string propertyUri;
bool isInverse;
string targetVar = _sparqlModel.NextVariable();
_map.TryGetUriForNavigationProperty(navigation.NavigationProperty.DeclaringEntityType().FullName(),
navigation.NavigationProperty.Name,
out propertyUri,
out isInverse);
if (isInverse)
{
// Target is the subject of a triple
_sparqlModel.CurrentGraphPattern.Add(
new TriplePattern(new VariablePatternItem(targetVar),
new UriPatternItem(propertyUri),
sourcePatternItem));
}
else
{
_sparqlModel.CurrentGraphPattern.Add(
new TriplePattern(sourcePatternItem,
new UriPatternItem(propertyUri),
new VariablePatternItem(targetVar)));
}
return(targetVar);
}
throw new Exception("Cannot process navigation node as source could not be processed.");
}
public TriplePattern(IPatternItem subject, IPatternItem predicate, IPatternItem @object)
{
Subject = subject;
Predicate = predicate;
Object = @object;
}
public TriplePattern(IPatternItem subject, IPatternItem predicate, IPatternItem @object)
{
Subject = subject;
Predicate = predicate;
Object = @object;
}