/// <summary>
/// Copies a Node using another Node Factory
/// </summary>
/// <param name="original">Node to copy</param>
/// <param name="target">Factory to copy into</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// <strong>Warning:</strong> Copying Blank Nodes may lead to unforseen circumstances since no remapping of IDs between Factories is done
/// </para>
/// </remarks>
public static INode CopyNode(INode original, INodeFactory target) {
if (ReferenceEquals(original.Graph, target)) return original;
switch (original.NodeType) {
case NodeType.Blank:
return target.CreateBlankNode(((IBlankNode)original).InternalID);
case NodeType.GraphLiteral:
return target.CreateGraphLiteralNode(((IGraphLiteralNode)original).SubGraph);
case NodeType.Literal:
ILiteralNode lit = (ILiteralNode)original;
if (lit.DataType != null) {
return target.CreateLiteralNode(lit.Value, lit.DataType);
} else if (!lit.Language.Equals(String.Empty)) {
return target.CreateLiteralNode(lit.Value, lit.Language);
} else {
return target.CreateLiteralNode(lit.Value);
}
case NodeType.Uri:
return target.CreateUriNode(((IUriNode)original).Uri);
case NodeType.Variable:
return target.CreateVariableNode(((IVariableNode)original).VariableName);
default:
throw new RdfException("Unable to Copy '" + original.GetType().ToString() + "' Nodes between Node Factories");
}
}
/// <summary>
/// Creates a Node for the Context
/// </summary>
/// <param name="n">Node</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// In effect all this does is ensure that all Nodes end up in the same Graph which may occassionally not happen otherwise when Graph wrappers are involved
/// </para>
/// </remarks>
public INode GetNode(INode n)
{
if (_nodeMap == null)
{
_nodeMap = new MultiDictionary <INode, INode>(new FastVirtualNodeComparer());
}
if (_nodeMap.ContainsKey(n))
{
return(_nodeMap[n]);
}
INode temp;
switch (n.NodeType)
{
case NodeType.Blank:
temp = GetBlankNode(((IBlankNode)n).InternalID);
break;
case NodeType.Variable:
IVariableNode v = (IVariableNode)n;
temp = _factory.CreateVariableNode(v.VariableName);
break;
case NodeType.GraphLiteral:
IGraphLiteralNode g = (IGraphLiteralNode)n;
temp = _factory.CreateGraphLiteralNode(g.SubGraph);
break;
case NodeType.Uri:
IUriNode u = (IUriNode)n;
temp = _factory.CreateUriNode(u.Uri);
break;
case NodeType.Literal:
ILiteralNode l = (ILiteralNode)n;
if (l.DataType != null)
{
temp = _factory.CreateLiteralNode(l.Value, l.DataType);
}
else if (!l.Language.Equals(String.Empty))
{
temp = _factory.CreateLiteralNode(l.Value, l.Language);
}
else
{
temp = _factory.CreateLiteralNode(l.Value);
}
break;
default:
throw new RdfQueryException("Cannot construct unknown Node Types");
}
_nodeMap.Add(n, temp);
return(temp);
}
public void SparqlAggregatesOverNullGroupConcat1()
{
SparqlQuery q = _parser.ParseFromString("SELECT (GROUP_CONCAT(?s) AS ?GroupConcat) WHERE { ?s ?p ?o }");
SparqlResultSet results = _processor.ProcessQuery(q) as SparqlResultSet;
Assert.NotNull(results);
Assert.Equal(1, results.Count);
SparqlResult r = results.First();
Assert.Equal(_factory.CreateLiteralNode(string.Empty), r["GroupConcat"]);
}
internal static INode TryParseNodeValue(INodeFactory factory, String value)
{
try
{
if (value.StartsWith("_:"))
{
return(factory.CreateBlankNode(value.Substring(2)));
}
else if (value.StartsWith("<"))
{
return(factory.CreateUriNode(new Uri(UnescapeValue(value.Substring(1, value.Length - 2)))));
}
else
{
if (value.EndsWith("\""))
{
return(factory.CreateLiteralNode(UnescapeValue(value.Substring(1, value.Length - 2))));
}
else if (value.EndsWith(">"))
{
String lit = value.Substring(1, value.LastIndexOf("^^<") - 2);
String dt = value.Substring(lit.Length + 5, value.Length - lit.Length - 6);
return(factory.CreateLiteralNode(UnescapeValue(lit), new Uri(UnescapeValue(dt))));
}
else
{
String lit = value.Substring(1, value.LastIndexOf("\"@") - 1);
String lang = value.Substring(lit.Length + 3);
return(factory.CreateLiteralNode(UnescapeValue(lit), UnescapeValue(lang)));
}
}
}
catch (Exception ex)
{
throw new RdfParseException("Failed to parse the value '" + value + "' into a valid Node: " + ex.Message, ex);
}
}
/// <summary>Converts a RomanticWeb's <see cref="Node"/> into dotNetRDF's <see cref="INode"/>.</summary>
public static INode UnWrapNode(this Node node, INodeFactory nodeFactory)
{
if (node.IsUri)
{
return nodeFactory.CreateUriNode(node.Uri);
}
if (node.IsLiteral)
{
if (node.Language != null)
{
return nodeFactory.CreateLiteralNode(node.Literal, node.Language);
}
if (node.DataType != null)
{
return nodeFactory.CreateLiteralNode(node.Literal, node.DataType);
}
return nodeFactory.CreateLiteralNode(node.Literal);
}
return nodeFactory.CreateBlankNode(node.BlankNode);
}
/// <summary>Converts a RomanticWeb's <see cref="Node"/> into dotNetRDF's <see cref="VDS.RDF.INode"/>.</summary>
public static VDS.RDF.INode UnWrapNode(this Model.INode node, INodeFactory nodeFactory)
{
if (node.IsUri)
{
return(nodeFactory.CreateUriNode(node.Uri));
}
if (node.IsLiteral)
{
if (node.Language != null)
{
return(nodeFactory.CreateLiteralNode(node.Literal, node.Language));
}
if (node.DataType != null)
{
return(nodeFactory.CreateLiteralNode(node.Literal, node.DataType));
}
return(nodeFactory.CreateLiteralNode(node.Literal));
}
return(nodeFactory.CreateBlankNode(node.BlankNode));
}
/// <summary>
/// Creates a Literal Node with the given Datatype
/// </summary>
/// <param name="literal">Value</param>
/// <param name="datatype">Datatype URI</param>
/// <returns></returns>
public virtual ILiteralNode CreateLiteralNode(string literal, Uri datatype)
{
return(_factory.CreateLiteralNode(literal, datatype));
}
/// <summary>
/// This method is called for every Lambda invocation. This method takes in an S3 event object and can be used
/// to respond to S3 notifications.
/// </summary>
/// <param name="s3Event"></param>
/// <param name="context"></param>
/// <returns></returns>
public async Task FunctionHandler(S3Event s3Event, ILambdaContext context)
{
foreach (var record in s3Event.Records)
{
try
{
using (GetObjectResponse response = await _s3Client.GetObjectAsync(new GetObjectRequest()
{
BucketName = record.S3.Bucket.Name,
Key = record.S3.Object.Key
}))
{
using (StreamReader reader = new StreamReader(response.ResponseStream))
{
//
// get text detail
//
var textDetail = JsonConvert.DeserializeObject <TextDetail>(await reader.ReadToEndAsync());
//
// load selfies graph
//
IGraph textsGraph = new Graph();
_blazegraph.LoadGraph(textsGraph, UriFactory.Create(TEXTS_GRAPH));
//
// create triples
//
INode textNode = null;
try
{
textNode = _nodeFactory.CreateUriNode(UriFactory.Create(Uri.EscapeUriString("http://blazegraph-webapp/" + textDetail.Id)));
}
catch (Exception ex)
{
context.Logger.LogLine(ex.Message);
return;
}
var triples = new List <Triple>();
// text instance is of type Text class
triples.Add(new Triple(
subj: textNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text"))
));
// text instance label
triples.Add(new Triple(
subj: textNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDFS + "label")),
obj: _nodeFactory.CreateLiteralNode(textDetail.Id, new Uri(XmlSpecsHelper.XmlSchemaDataTypeString))
));
// text instance has an entityCollection instance
triples.Add(new Triple(
subj: textNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/hasEntityCollection")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection/" + textDetail.Id))
));
// entityCollection instance is of type EntityCollection class
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection/" + textDetail.Id)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection"))
));
// filling entityCollection attributes
foreach (var entity in textDetail.Entities)
{
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection/" + textDetail.Id)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection/hasEntity")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection/" + entity.Type.Value.ToLower()))
));
// entity instance is of type Entity class
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection/" + entity.Type.Value.ToLower())),
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/entityCollection/entity"))
));
}
// text instance has an sentiment instance
triples.Add(new Triple(
subj: textNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/hasSentiment")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/sentiment/" + textDetail.Id))
));
// sentiment instance is of type sentiment that the text has
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/sentiment/" + textDetail.Id)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/" + textDetail.Sentiment.Value.ToLower()))
));
// the class sentiment that the text has is a sublcass of Sentiment class
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/" + textDetail.Sentiment.Value.ToLower())),
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDFS + "subClassOf")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/text/sentiment"))
));
//
// updated triples in graph
//
try
{
_blazegraph.UpdateGraph(UriFactory.Create(TEXTS_GRAPH), triples, new List <Triple>());
context.Logger.LogLine("Updated triples successfully.");
}
catch (Exception ex)
{
context.Logger.LogLine(ex.Message);
context.Logger.LogLine(ex.InnerException.Message);
return;
}
}
}
}
catch (AmazonS3Exception ex)
{
context.Logger.LogLine(ex.Message);
}
}
}
/// <summary>
/// Copies a Node using another Node Factory
/// </summary>
/// <param name="original">Node to copy</param>
/// <param name="target">Factory to copy into</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// <strong>Warning:</strong> Copying Blank Nodes may lead to unforseen circumstances since no remapping of IDs between Factories is done
/// </para>
/// </remarks>
public static INode CopyNode(INode original, INodeFactory target)
{
if (ReferenceEquals(original.Graph, target)) return original;
switch (original.NodeType)
{
case NodeType.Blank:
return target.CreateBlankNode(((IBlankNode)original).InternalID);
case NodeType.GraphLiteral:
return target.CreateGraphLiteralNode(((IGraphLiteralNode)original).SubGraph);
case NodeType.Literal:
ILiteralNode lit = (ILiteralNode)original;
if (lit.DataType != null)
{
return target.CreateLiteralNode(lit.Value, lit.DataType);
}
else if (!lit.Language.Equals(String.Empty))
{
return target.CreateLiteralNode(lit.Value, lit.Language);
}
else
{
return target.CreateLiteralNode(lit.Value);
}
case NodeType.Uri:
return target.CreateUriNode(((IUriNode)original).Uri);
case NodeType.Variable:
return target.CreateVariableNode(((IVariableNode)original).VariableName);
default:
throw new RdfException("Unable to Copy '" + original.GetType().ToString() + "' Nodes between Node Factories");
}
}
public static INode AsLiteralNode(this INodeFactory nodeFactory, string value, string langspec)
{
return(nodeFactory.CreateLiteralNode(value, langspec));
}
internal static INode TryParseNodeValue(INodeFactory factory, String value)
{
try
{
if (value.StartsWith("_:"))
{
return factory.CreateBlankNode(value.Substring(2));
}
else if (value.StartsWith("<"))
{
return factory.CreateUriNode(new Uri(UnescapeValue(value.Substring(1, value.Length - 2))));
}
else
{
if (value.EndsWith("\""))
{
return factory.CreateLiteralNode(UnescapeValue(value.Substring(1, value.Length - 2)));
}
else if (value.EndsWith(">"))
{
String lit = value.Substring(1, value.LastIndexOf("^^<") - 2);
String dt = value.Substring(lit.Length + 5, value.Length - lit.Length - 6);
return factory.CreateLiteralNode(UnescapeValue(lit), new Uri(UnescapeValue(dt)));
}
else
{
String lit = value.Substring(1, value.LastIndexOf("\"@") - 1);
String lang = value.Substring(lit.Length + 3);
return factory.CreateLiteralNode(UnescapeValue(lit), UnescapeValue(lang));
}
}
}
catch (Exception ex)
{
throw new RdfParseException("Failed to parse the value '" + value + "' into a valid Node: " + ex.Message, ex);
}
}
/// <summary>
/// This method is called for every Lambda invocation. This method takes in an S3 event object and can be used
/// to respond to S3 notifications.
/// </summary>
/// <param name="s3Event"></param>
/// <param name="context"></param>
/// <returns></returns>
public async Task FunctionHandler(S3Event s3Event, ILambdaContext context)
{
foreach (var record in s3Event.Records)
{
try
{
using (GetObjectResponse response = await _s3Client.GetObjectAsync(new GetObjectRequest()
{
BucketName = record.S3.Bucket.Name,
Key = record.S3.Object.Key
}))
{
using (StreamReader reader = new StreamReader(response.ResponseStream))
{
//
// get main face
//
var selfieDetail = JsonConvert.DeserializeObject <SelfieDetail>(await reader.ReadToEndAsync());
var mainFace = selfieDetail.FacesDetails.OrderByDescending(faceDetail => faceDetail.BoundingBox.Width * faceDetail.BoundingBox.Height).First();
//
// load selfies graph
//
IGraph selfiesGraph = new Graph();
_blazegraph.LoadGraph(selfiesGraph, UriFactory.Create(SELFIES_GRAPH));
//
// create triples
//
INode imageNode = null;
try
{
imageNode = _nodeFactory.CreateUriNode(UriFactory.Create(Uri.EscapeUriString("http://blazegraph-webapp/" + selfieDetail.ImageName)));
}
catch (Exception ex)
{
context.Logger.LogLine(ex.Message);
return;
}
var triples = new List <Triple>();
// image instance is of type Selfie class
triples.Add(new Triple(
subj: imageNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie"))
));
// image instance label
triples.Add(new Triple(
subj: imageNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDFS + "label")),
obj: _nodeFactory.CreateLiteralNode(selfieDetail.ImageName, new Uri(XmlSpecsHelper.XmlSchemaDataTypeString))
));
// image instance has a faceDetail instance
triples.Add(new Triple(
subj: imageNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/hasFaceDetail")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName))
));
// faceDetail instance is of type FaceDetail class
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail"))
));
// filling faceDetail attributes
triples.AddRange(new List <Triple>()
{
new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/isGender")),
obj: _nodeFactory.CreateLiteralNode(mainFace.Gender.Value.ToString().ToLower(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeString))
),
new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/hasMinAge")),
obj: _nodeFactory.CreateLiteralNode(mainFace.AgeRange.Low.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeInteger))
),
new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/hasMaxAge")),
obj: _nodeFactory.CreateLiteralNode(mainFace.AgeRange.High.ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeInteger))
),
new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/isSmiling")),
obj: _nodeFactory.CreateLiteralNode(Convert.ToInt32(mainFace.Smile.Value).ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeBoolean))
),
new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/hasSunglasses")),
obj: _nodeFactory.CreateLiteralNode(Convert.ToInt32(mainFace.Sunglasses.Value).ToString(), new Uri(XmlSpecsHelper.XmlSchemaDataTypeBoolean))
),
new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/faceDetail/isFeeling")),
obj: _nodeFactory.CreateLiteralNode(mainFace.Emotions.OrderByDescending(emotion => emotion.Confidence).First().Type.ToString().ToLower(),
new Uri(XmlSpecsHelper.XmlSchemaDataTypeString))
)
});
// image instance has scene instance
triples.Add(new Triple(
subj: imageNode,
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/hasScene")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + selfieDetail.ImageName))
));
// scene instance is of type Scene class
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create(NamespaceMapper.RDF + "type")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene"))
));
// filling scence attributes
foreach (var label in selfieDetail.Labels)
{
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + selfieDetail.ImageName)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/isDescribedBy")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + label.Name))
));
foreach (var parentLabel in label.Parents)
{
triples.Add(new Triple(
subj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + label.Name)),
pred: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/hasParent")),
obj: _nodeFactory.CreateUriNode(UriFactory.Create("http://blazegraph-webapp/selfie/scene/" + parentLabel.Name))
));
}
}
//
// updated triples in graph
//
try
{
_blazegraph.UpdateGraph(UriFactory.Create(SELFIES_GRAPH), triples, new List <Triple>());
context.Logger.LogLine("Updated triples successfully.");
}
catch (Exception ex)
{
context.Logger.LogLine(ex.Message);
context.Logger.LogLine(ex.InnerException.Message);
return;
}
}
}
}
catch (AmazonS3Exception ex)
{
context.Logger.LogLine(ex.Message);
}
}
}
/// <summary>
/// Decodes an Object into an appropriate Node
/// </summary>
/// <param name="factory">Node Factory to use to create Node</param>
/// <param name="n">Object to convert</param>
/// <returns></returns>
private INode LoadNode(INodeFactory factory, Object n)
{
INode temp;
if (n is SqlExtendedString)
{
SqlExtendedString iri = (SqlExtendedString)n;
if (iri.IriType == SqlExtendedStringType.BNODE)
{
//Blank Node
temp = factory.CreateBlankNode(n.ToString().Substring(9));
}
else if (iri.IriType != iri.StrType)
{
//Literal
temp = factory.CreateLiteralNode(n.ToString());
}
else if (iri.IriType == SqlExtendedStringType.IRI)
{
//Uri
Uri u = new Uri(n.ToString(), UriKind.RelativeOrAbsolute);
if (!u.IsAbsoluteUri)
{
throw new RdfParseException("Virtuoso returned a URI Node which has a relative URI, unable to resolve the URI for this node");
}
temp = factory.CreateUriNode(u);
}
else
{
//Assume a Literal
temp = factory.CreateLiteralNode(n.ToString());
}
}
else if (n is SqlRdfBox)
{
SqlRdfBox lit = (SqlRdfBox)n;
if (lit.StrLang != null)
{
//Language Specified Literal
temp = factory.CreateLiteralNode(n.ToString(), lit.StrLang);
}
else if (lit.StrType != null)
{
//Data Typed Literal
temp = factory.CreateLiteralNode(n.ToString(), new Uri(lit.StrType));
}
else
{
//Literal
temp = factory.CreateLiteralNode(n.ToString());
}
}
else if (n is String)
{
String s = n.ToString();
if (s.StartsWith("nodeID://"))
{
//Blank Node
temp = factory.CreateBlankNode(s.Substring(9));
}
else
{
//Literal
temp = factory.CreateLiteralNode(s);
}
}
else if (n is Int32)
{
temp = ((Int32)n).ToLiteral(factory);
}
else if (n is Int16)
{
temp = ((Int16)n).ToLiteral(factory);
}
else if (n is Single)
{
temp = ((Single)n).ToLiteral(factory);
}
else if (n is Double)
{
temp = ((Double)n).ToLiteral(factory);
}
else if (n is Decimal)
{
temp = ((Decimal)n).ToLiteral(factory);
}
else if (n is DateTime)
{
temp = ((DateTime)n).ToLiteral(factory);
}
else if (n is TimeSpan)
{
temp = ((TimeSpan)n).ToLiteral(factory);
}
else if (n is Boolean)
{
temp = ((Boolean)n).ToLiteral(factory);
}
else if (n is DBNull)
{
//Fix by Alexander Sidarov for Virtuoso's results for unbound variables in OPTIONALs
temp = null;
}
else
{
throw new RdfStorageException("Unexpected Object Type '" + n.GetType().ToString() + "' returned from SPASQL SELECT query to the Virtuoso Quad Store");
}
return temp;
}