public virtual int CompareTo(RDFDataset.Node o)
{
if (this.IsIRI())
{
if (!o.IsIRI())
{
// IRIs > everything
return(1);
}
}
else
{
if (this.IsBlankNode())
{
if (o.IsIRI())
{
// IRI > blank node
return(-1);
}
else
{
if (o.IsLiteral())
{
// blank node > literal
return(1);
}
}
}
}
return(string.CompareOrdinal(this.GetValue(), o.GetValue()));
}
public Quad(RDFDataset.Node subject, RDFDataset.Node predicate, RDFDataset.Node @object
, string graph) : base()
{
this["subject"] = subject;
this["predicate"] = predicate;
this["object"] = @object;
if (graph != null && !"@default".Equals(graph))
{
// TODO: i'm not yet sure if this should be added or if the
// graph should only be represented by the keys in the dataset
this["name"] = graph.StartsWith("_:") ? (Node) new RDFDataset.BlankNode(graph) : (Node) new RDFDataset.IRI
(graph);
}
}
public override int CompareTo(RDFDataset.Node o)
{
if (o == null)
{
// valid nodes are > null nodes
return(1);
}
if (o.IsIRI())
{
// literals < iri
return(-1);
}
if (o.IsBlankNode())
{
// blank node < iri
return(-1);
}
if (this.GetLanguage() == null && ((RDFDataset.Literal)o).GetLanguage() != null)
{
return(-1);
}
else
{
if (this.GetLanguage() != null && ((RDFDataset.Literal)o).GetLanguage() == null)
{
return(1);
}
}
if (this.GetDatatype() != null)
{
return(string.CompareOrdinal(this.GetDatatype(), ((RDFDataset.Literal)o).GetDatatype
()));
}
else
{
if (((RDFDataset.Literal)o).GetDatatype() != null)
{
return(-1);
}
}
return(0);
}
internal static string ToNQuad(RDFDataset.Quad triple, string graphName, string bnode
)
{
RDFDataset.Node s = triple.GetSubject();
RDFDataset.Node p = triple.GetPredicate();
RDFDataset.Node o = triple.GetObject();
string quad = string.Empty;
// subject is an IRI or bnode
if (s.IsIRI())
{
quad += "<" + Escape(s.GetValue()) + ">";
}
else
{
// normalization mode
if (bnode != null)
{
quad += bnode.Equals(s.GetValue()) ? "_:a" : "_:z";
}
else
{
// normal mode
quad += s.GetValue();
}
}
if (p.IsIRI())
{
quad += " <" + Escape(p.GetValue()) + "> ";
}
else
{
// otherwise it must be a bnode (TODO: can we only allow this if the
// flag is set in options?)
quad += " " + Escape(p.GetValue()) + " ";
}
// object is IRI, bnode or literal
if (o.IsIRI())
{
quad += "<" + Escape(o.GetValue()) + ">";
}
else
{
if (o.IsBlankNode())
{
// normalization mode
if (bnode != null)
{
quad += bnode.Equals(o.GetValue()) ? "_:a" : "_:z";
}
else
{
// normal mode
quad += o.GetValue();
}
}
else
{
string escaped = Escape(o.GetValue());
quad += "\"" + escaped + "\"";
if (JSONLDConsts.RdfLangstring.Equals(o.GetDatatype()))
{
quad += "@" + o.GetLanguage();
}
else
{
if (!JSONLDConsts.XsdString.Equals(o.GetDatatype()))
{
quad += "^^<" + Escape(o.GetDatatype()) + ">";
}
}
}
}
// graph
if (graphName != null)
{
if (graphName.IndexOf("_:") != 0)
{
quad += " <" + Escape(graphName) + ">";
}
else
{
if (bnode != null)
{
quad += " _:g";
}
else
{
quad += " " + graphName;
}
}
}
quad += " .\n";
return(quad);
}
/// <summary>Creates an array of RDF triples for the given graph.</summary>
/// <remarks>Creates an array of RDF triples for the given graph.</remarks>
/// <param name="graph">the graph to create RDF triples for.</param>
internal virtual void GraphToRDF(string graphName, JObject graph
)
{
// 4.2)
IList <RDFDataset.Quad> triples = new List <RDFDataset.Quad>();
// 4.3)
IEnumerable <string> subjects = graph.GetKeys();
// Collections.sort(subjects);
foreach (string id in subjects)
{
if (JsonLdUtils.IsRelativeIri(id))
{
continue;
}
JObject node = (JObject)graph[id];
JArray properties = new JArray(node.GetKeys());
properties.SortInPlace();
foreach (string property in properties)
{
var localProperty = property;
JArray values;
// 4.3.2.1)
if ("@type".Equals(localProperty))
{
values = (JArray)node["@type"];
localProperty = JSONLDConsts.RdfType;
}
else
{
// 4.3.2.2)
if (JsonLdUtils.IsKeyword(localProperty))
{
continue;
}
else
{
// 4.3.2.3)
if (localProperty.StartsWith("_:") && !api.opts.GetProduceGeneralizedRdf())
{
continue;
}
else
{
// 4.3.2.4)
if (JsonLdUtils.IsRelativeIri(localProperty))
{
continue;
}
else
{
values = (JArray)node[localProperty];
}
}
}
}
RDFDataset.Node subject;
if (id.IndexOf("_:") == 0)
{
// NOTE: don't rename, just set it as a blank node
subject = new RDFDataset.BlankNode(id);
}
else
{
subject = new RDFDataset.IRI(id);
}
// RDF predicates
RDFDataset.Node predicate;
if (localProperty.StartsWith("_:"))
{
predicate = new RDFDataset.BlankNode(localProperty);
}
else
{
predicate = new RDFDataset.IRI(localProperty);
}
foreach (JToken item in values)
{
// convert @list to triples
if (JsonLdUtils.IsList(item))
{
JArray list = (JArray)((JObject)item)["@list"];
RDFDataset.Node last = null;
RDFDataset.Node firstBNode = nil;
if (!list.IsEmpty())
{
last = ObjectToRDF(list[list.Count - 1]);
firstBNode = new RDFDataset.BlankNode(api.GenerateBlankNodeIdentifier());
}
triples.Add(new RDFDataset.Quad(subject, predicate, firstBNode, graphName));
for (int i = 0; i < list.Count - 1; i++)
{
RDFDataset.Node @object = ObjectToRDF(list[i]);
triples.Add(new RDFDataset.Quad(firstBNode, first, @object, graphName));
RDFDataset.Node restBNode = new RDFDataset.BlankNode(api.GenerateBlankNodeIdentifier
());
triples.Add(new RDFDataset.Quad(firstBNode, rest, restBNode, graphName));
firstBNode = restBNode;
}
if (last != null)
{
triples.Add(new RDFDataset.Quad(firstBNode, first, last, graphName));
triples.Add(new RDFDataset.Quad(firstBNode, rest, nil, graphName));
}
}
else
{
// convert value or node object to triple
RDFDataset.Node @object = ObjectToRDF(item);
if (@object != null)
{
triples.Add(new RDFDataset.Quad(subject, predicate, @object, graphName));
}
}
}
}
}
this[graphName] = triples;
}
private Quad(string subject, string predicate, RDFDataset.Node @object, string graph
) : this(subject.StartsWith("_:") ? (Node) new RDFDataset.BlankNode(subject) : (Node) new RDFDataset.IRI
(subject), new RDFDataset.IRI(predicate), @object, graph)
{
}
