private void VisitStatements(ContentfulClass instance, INode subject)
{
var statements = instance
.GetType()
.GetProperties()
.Where(p => Attribute.IsDefined(p, typeof(PredicateAttribute)))
.Select(p => new
{
Predicate = this.Graph.CreateUriNode(new Uri(p.GetCustomAttribute <PredicateAttribute>().Uri)),
Object = p.GetValue(instance)
})
.Where(field => field.Object != null);
foreach (var statement in statements)
{
if (statement.Object is ContentfulClass contentful)
{
this.VisitObject(subject, statement.Predicate, contentful);
}
else if (statement.Object is IEnumerable <ContentfulClass> collection)
{
this.VisitObject(subject, statement.Predicate, collection);
}
else
{
this.VisitObject(subject, statement.Predicate, statement.Object.ToString());
}
}
}
private void VisitSubject(ContentfulClass instance)
{
var subject = this.GetId(instance);
this.VisitType(instance, subject);
this.VisitStatements(instance, subject);
}
private void VisitObject(INode subject, IUriNode predicate, ContentfulClass item)
{
var @object = this.GetId(item);
this.Graph.Assert(subject, predicate, @object);
if (!this.Graph.GetTriplesWithSubject(@object).Any())
{
this.VisitSubject(item);
}
}
private void VisitType(ContentfulClass instance, INode subject)
{
var classAttribute = instance.GetType().GetCustomAttribute <ClassAttribute>();
if (classAttribute != null)
{
this.Graph.Assert(
subject,
this.Graph.CreateUriNode(new Uri(RdfSpecsHelper.RdfType)),
this.Graph.CreateUriNode(new Uri(classAttribute.Uri))
);
}
}
private INode GetId(ContentfulClass instance)
{
var baseUriAttribute = instance.GetType().GetCustomAttribute <BaseUriAttribute>();
if (baseUriAttribute == null)
{
throw new Exception($"BaseUriAttribute missing on {instance.GetType()}");
}
var id = instance.Sys.Id;
if (instance is IUriEntry uriEntry)
{
id = uriEntry.Uri;
}
return(this.Graph.CreateUriNode(new Uri(new Uri(baseUriAttribute.Uri), id)));
}
public Processor(ContentfulClass instance) : this(instance.AsEnumerable())
{
}