/// <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 new Blank Node for this Context
/// </summary>
/// <param name="id">ID</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// If the same Blank Node ID is used multiple times in this Context you will always get the same Blank Node for that ID
/// </para>
/// </remarks>
public INode GetBlankNode(String id)
{
if (_bnodeMap == null)
{
_bnodeMap = new Dictionary <string, INode>();
}
if (_bnodeMap.ContainsKey(id))
{
return(_bnodeMap[id]);
}
INode temp;
if (_g != null)
{
temp = _g.CreateBlankNode();
}
else if (_factory != null)
{
temp = _factory.CreateBlankNode();
}
else if (_s != null)
{
temp = new BlankNode(_g, id.Substring(2) + _s.ID);
}
else
{
temp = new BlankNode(_g, id.Substring(2));
}
_bnodeMap.Add(id, temp);
return(temp);
}
public static INode ToNode(this EntityId entityId, INodeFactory factory)
{
if (entityId is BlankId)
{
return(factory.CreateBlankNode(entityId.Uri.Authority));
}
return(factory.CreateUriNode(entityId.Uri));
}
public static INode ToNode(this EntityId entityId, INodeFactory factory)
{
if (entityId is BlankId)
{
return factory.CreateBlankNode(entityId.Uri.Authority);
}
return factory.CreateUriNode(entityId.Uri);
}
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));
}
//OPT: Replace with usage of MapTriple instead?
/// <summary>
/// Helper method which rewrites Blank Node IDs for Describe Queries
/// </summary>
/// <param name="t">Triple</param>
/// <param name="mapping">Mapping of IDs to new Blank Nodes</param>
/// <param name="factory">Factory to create Nodes in</param>
/// <returns></returns>
protected Triple RewriteDescribeBNodes(Triple t, Dictionary <String, INode> mapping, INodeFactory factory)
{
INode s, p, o;
String id;
if (t.Subject.NodeType == NodeType.Blank)
{
id = t.Subject.GetHashCode() + "-" + t.Graph.GetHashCode();
if (mapping.ContainsKey(id))
{
s = mapping[id];
}
else
{
s = factory.CreateBlankNode(id);
mapping.Add(id, s);
}
}
else
{
s = Tools.CopyNode(t.Subject, factory);
}
if (t.Predicate.NodeType == NodeType.Blank)
{
id = t.Predicate.GetHashCode() + "-" + t.Graph.GetHashCode();
if (mapping.ContainsKey(id))
{
p = mapping[id];
}
else
{
p = factory.CreateBlankNode(id);
mapping.Add(id, p);
}
}
else
{
p = Tools.CopyNode(t.Predicate, factory);
}
if (t.Object.NodeType == NodeType.Blank)
{
id = t.Object.GetHashCode() + "-" + t.Graph.GetHashCode();
if (mapping.ContainsKey(id))
{
o = mapping[id];
}
else
{
o = factory.CreateBlankNode(id);
mapping.Add(id, o);
}
}
else
{
o = Tools.CopyNode(t.Object, factory);
}
return(new Triple(s, p, o));
}
/// <summary>
/// Creates a Blank Node
/// </summary>
/// <returns></returns>
public virtual IBlankNode CreateBlankNode()
{
return(_factory.CreateBlankNode());
}
/// <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 AsBlankNode(this INodeFactory nodeFactory, string nodeId)
{
return(nodeFactory.CreateBlankNode(nodeId));
}
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);
}
}
//OPT: Replace with usage of MapTriple instead?
/// <summary>
/// Helper method which rewrites Blank Node IDs for Describe Queries
/// </summary>
/// <param name="t">Triple</param>
/// <param name="mapping">Mapping of IDs to new Blank Nodes</param>
/// <param name="factory">Factory to create Nodes in</param>
/// <returns></returns>
protected Triple RewriteDescribeBNodes(Triple t, Dictionary<String, INode> mapping, INodeFactory factory)
{
INode s, p, o;
String id;
if (t.Subject.NodeType == NodeType.Blank)
{
id = t.Subject.GetHashCode() + "-" + t.Graph.GetHashCode();
if (mapping.ContainsKey(id))
{
s = mapping[id];
}
else
{
s = factory.CreateBlankNode(id);
mapping.Add(id, s);
}
}
else
{
s = Tools.CopyNode(t.Subject, factory);
}
if (t.Predicate.NodeType == NodeType.Blank)
{
id = t.Predicate.GetHashCode() + "-" + t.Graph.GetHashCode();
if (mapping.ContainsKey(id))
{
p = mapping[id];
}
else
{
p = factory.CreateBlankNode(id);
mapping.Add(id, p);
}
}
else
{
p = Tools.CopyNode(t.Predicate, factory);
}
if (t.Object.NodeType == NodeType.Blank)
{
id = t.Object.GetHashCode() + "-" + t.Graph.GetHashCode();
if (mapping.ContainsKey(id))
{
o = mapping[id];
}
else
{
o = factory.CreateBlankNode(id);
mapping.Add(id, o);
}
}
else
{
o = Tools.CopyNode(t.Object, factory);
}
return new Triple(s, p, o);
}
/// <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;
}
