| public static IsRelativeIri ( string value ) : bool | ||
| value | string | |
| return | bool | |
/// <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;
}
/// <summary>
/// Converts a JSON-LD value object to an RDF literal or a JSON-LD string or
/// node object to an RDF resource.
/// </summary>
/// <remarks>
/// Converts a JSON-LD value object to an RDF literal or a JSON-LD string or
/// node object to an RDF resource.
/// </remarks>
/// <param name="item">the JSON-LD value or node object.</param>
/// <param name="namer">the UniqueNamer to use to assign blank node names.</param>
/// <returns>the RDF literal or RDF resource.</returns>
private RDFDataset.Node ObjectToRDF(JToken item)
{
// convert value object to RDF
if (JsonLdUtils.IsValue(item))
{
JToken value = ((JObject)item)["@value"];
JToken datatype = ((JObject)item)["@type"];
// convert to XSD datatypes as appropriate
if (value.Type == JTokenType.Boolean || value.Type == JTokenType.Float || value.Type == JTokenType.Integer)
{
// convert to XSD datatype
if (value.Type == JTokenType.Boolean)
{
var serializeObject = JsonConvert.SerializeObject(value, Formatting.None).Trim('"');
return(new RDFDataset.Literal(serializeObject, datatype.IsNull() ? JSONLDConsts.XsdBoolean
: (string)datatype, null));
}
else
{
if (value.Type == JTokenType.Float || datatype.SafeCompare(JSONLDConsts.XsdDouble))
{
// Workaround for Newtonsoft.Json's refusal to cast a JTokenType.Integer to a double.
if (value.Type == JTokenType.Integer)
{
int number = (int)value;
value = new JValue((double)number);
}
// canonical double representation
return(new RDFDataset.Literal(string.Format(CultureInfo.InvariantCulture, "{0:0.0###############E0}", (double)value), datatype.IsNull() ? JSONLDConsts.XsdDouble
: (string)datatype, null));
}
else
{
return(new RDFDataset.Literal(string.Format("{0:0}", value), datatype.IsNull() ? JSONLDConsts.XsdInteger
: (string)datatype, null));
}
}
}
else
{
if (((JObject)item).ContainsKey("@language"))
{
return(new RDFDataset.Literal((string)value, datatype.IsNull() ? JSONLDConsts.RdfLangstring
: (string)datatype, (string)((JObject)item)["@language"]));
}
else
{
var serializeObject = JsonConvert.SerializeObject(value, Formatting.None).Trim('"');
return(new RDFDataset.Literal(serializeObject, datatype.IsNull() ? JSONLDConsts.XsdString
: (string)datatype, null));
}
}
}
else
{
// convert string/node object to RDF
string id;
if (JsonLdUtils.IsObject(item))
{
id = (string)((JObject)item)["@id"];
if (JsonLdUtils.IsRelativeIri(id))
{
return(null);
}
}
else
{
id = (string)item;
}
if (id.IndexOf("_:") == 0)
{
// NOTE: once again no need to rename existing blank nodes
return(new RDFDataset.BlankNode(id));
}
else
{
return(new RDFDataset.IRI(id));
}
}
}
/// <summary>
/// Converts a JSON-LD value object to an RDF literal or a JSON-LD string or
/// node object to an RDF resource.
/// </summary>
/// <remarks>
/// Converts a JSON-LD value object to an RDF literal or a JSON-LD string or
/// node object to an RDF resource.
/// </remarks>
/// <param name="item">the JSON-LD value or node object.</param>
/// <param name="namer">the UniqueNamer to use to assign blank node names.</param>
/// <returns>the RDF literal or RDF resource.</returns>
private RDFDataset.Node ObjectToRDF(JToken item)
{
// convert value object to RDF
if (JsonLdUtils.IsValue(item))
{
JToken value = ((JObject)item)["@value"];
JToken datatype = ((JObject)item)["@type"];
// convert to XSD datatypes as appropriate
if (value.Type == JTokenType.Boolean || value.Type == JTokenType.Float || value.Type == JTokenType.Integer)
{
// convert to XSD datatype
if (value.Type == JTokenType.Boolean)
{
return(new RDFDataset.Literal(value.ToString(), datatype.IsNull() ? JSONLDConsts.XsdBoolean
: (string)datatype, null));
}
else
{
if (value.Type == JTokenType.Float || datatype.SafeCompare(JSONLDConsts.XsdDouble))
{
// canonical double representation
return(new RDFDataset.Literal(string.Format("{0:0.0###############E0}", value), datatype.IsNull() ? JSONLDConsts.XsdDouble
: (string)datatype, null));
}
else
{
return(new RDFDataset.Literal(string.Format("{0:0}", value), datatype.IsNull() ? JSONLDConsts.XsdInteger
: (string)datatype, null));
}
}
}
else
{
if (((JObject)item).ContainsKey("@language"))
{
return(new RDFDataset.Literal((string)value, datatype.IsNull() ? JSONLDConsts.RdfLangstring
: (string)datatype, (string)((JObject)item)["@language"]));
}
else
{
return(new RDFDataset.Literal((string)value, datatype.IsNull() ? JSONLDConsts.XsdString
: (string)datatype, null));
}
}
}
else
{
// convert string/node object to RDF
string id;
if (JsonLdUtils.IsObject(item))
{
id = (string)((JObject)item)["@id"];
if (JsonLdUtils.IsRelativeIri(id))
{
return(null);
}
}
else
{
id = (string)item;
}
if (id.IndexOf("_:") == 0)
{
// NOTE: once again no need to rename existing blank nodes
return(new RDFDataset.BlankNode(id));
}
else
{
return(new RDFDataset.IRI(id));
}
}
}
