public SparqlResponseProperty GetNodeValuesFromSparqlResult(SparqlResult sparqlResult, string value)
{
INode node;
var data = new SparqlResponseProperty();
if (sparqlResult.TryGetValue(value, out node))
{
if (node != null)
{
data.Type = node.NodeType.ToString().ToLower();
switch (node.NodeType)
{
case NodeType.Uri:
data.Value = ((IUriNode)node).Uri.AbsoluteUri;
break;
case NodeType.Blank:
data.Value = ((IBlankNode)node).InternalID;
break;
case NodeType.Literal:
//You may want to inspect the DataType and Language properties and generate
//a different string here
data.Value = ((ILiteralNode)node).Value;
data.DataType = ((ILiteralNode)node).DataType?.OriginalString;
break;
default:
throw new RdfOutputException("Unexpected Node Type");
}
}
}
return(data);
}
public static T GetNode <T>(this SparqlResult result, string variable) where T : class
{
if (result.TryGetValue(variable, out INode subNode))
{
return(subNode as T);
}
return(default(T));
}
public static T GetValue <T>(this SparqlResult result, string variable)
where T : INode
{
if (result.TryGetValue(variable, out var node) && node is T tNode)
{
return(tNode);
}
throw new InvalidOperationException($"The result does not contain any values for '{variable}'.");
}
public static bool TryGetValue <T>(this SparqlResult result, string variable, out T value)
where T : INode
{
if (result.TryGetValue(variable, out var node) && node is T tNode)
{
value = tNode;
return(true);
}
value = default(T);
return(false);
}
public static SparqlResponseProperty GetNodeValuesFromSparqlResult(this SparqlResult sparqlResult, string value)
{
INode node;
var data = new SparqlResponseProperty();
if (sparqlResult.TryGetValue(value, out node))
{
if (node != null)
{
data.Type = node.NodeType.ToString().ToLower();
switch (node.NodeType)
{
case NodeType.Uri:
data.Type = Shacl.NodeKinds.IRI;
data.Value = ((IUriNode)node).Uri.AbsoluteUri;
break;
case NodeType.Blank:
data.Type = Shacl.NodeKinds.BlankNode;
data.Value = ((IBlankNode)node).InternalID;
break;
case NodeType.Literal:
//You may want to inspect the DataType and Language properties and generate
//a different string here
data.Type = Shacl.NodeKinds.Literal;
data.DataType = ((ILiteralNode)node).DataType?.OriginalString;
data.Value = ((ILiteralNode)node).Value;
data.Language = ((ILiteralNode)node).Language;
break;
default:
#pragma warning disable CA1303 // Do not pass literals as localized parameters
throw new RdfOutputException("Unexpected Node Type");
#pragma warning restore CA1303 // Do not pass literals as localized parameters
}
}
}
return(data);
}
private static string GetResultValue(SparqlResult result, string variable)
{
string data;
if (result.TryGetValue(variable, out var n))
{
switch (n.NodeType)
{
case NodeType.Uri:
data = ((IUriNode)n).Uri.AbsoluteUri;
break;
case NodeType.Blank:
data = ((IBlankNode)n).InternalID;
break;
case NodeType.Literal:
data = ((ILiteralNode)n).Value;
break;
case NodeType.GraphLiteral:
data = n.ToString();
break;
case NodeType.Variable:
data = n.ToString();
break;
default:
throw new RdfOutputException("Unexpected Node Type");
}
}
else
{
data = Empty;
}
return(data);
}
private static string GetValue(string variable, SparqlResult result, WebClient webClient)
{
string _answer = string.Empty;
INode _node;
if (result.TryGetValue(variable, out _node))
{
switch (_node.NodeType)
{
case NodeType.Uri:
string _uri = ((IUriNode)_node).Uri.AbsoluteUri;
if (webClient == null)
_answer = _uri;
else
try
{
_answer = webClient.DownloadString(_uri);
}
catch (WebException)
{
_answer = string.Empty;
}
break;
case NodeType.Blank:
_answer = ((IBlankNode)_node).ToString();
break;
case NodeType.Literal:
_answer = ((ILiteralNode)_node).Value;
break;
default:
throw new RdfOutputException("Unexpected Node Type");
}
}
return _answer;
}
