/// <summary>
/// Attempts to resolve a QName or URI Token into a URI Node and produces appropriate error messages if this fails
/// </summary>
/// <param name="handler">Results Handler</param>
/// <param name="t">Token to resolve</param>
/// <returns></returns>
/// <remarks>
/// It is <strong>not</strong> recommended to use this overload since an <see cref="IRdfHandler">IRdfHandler</see> cannot resolve QNames
/// </remarks>
internal static INode TryResolveUri(ISparqlResultsHandler handler, IToken t)
{
switch (t.TokenType)
{
case Token.QNAME:
throw new RdfException("Unable to resolve the QName since a Results Handler does not have a Namespace Map that can be used to resolve QNames");
case Token.URI:
try
{
String uri = Tools.ResolveUri(t.Value, String.Empty);
return(handler.CreateUriNode(new Uri(uri)));
}
catch (UriFormatException formatEx)
{
throw new RdfParseException("Unable to resolve the URI '" + t.Value + "' due to the following error:\n" + formatEx.Message, t, formatEx);
}
catch (RdfException rdfEx)
{
throw new RdfParseException("Unable to resolve the URI '" + t.Value + "' due to the following error:\n" + rdfEx.Message, t, rdfEx);
}
default:
throw ParserHelper.Error("Unexpected Token '" + t.GetType().ToString() + "' encountered, expected a URI/QName Token to resolve into a URI", t);
}
}
private INode GetSparqlValue(XElement binding, ISparqlResultsHandler resultSetHandler)
{
if (binding.Nodes().OfType <XElement>().Count() == 1)
{
var element = binding.Nodes().OfType <XElement>().First();
if (element.Name.LocalName == "uri")
{
string uri = element.Value;
return(resultSetHandler.CreateUriNode(new Uri(uri)));
}
else if (element.Name.LocalName == "literal")
{
string value = element.Value;
if (element.Attribute("type") != null)
{
var type = element.Attribute("type").Value;
if (type.StartsWith("xsd:"))
{
type = "http://www.w3.org/2001/XMLSchema#" + type.Substring(4);
}
var uriType = new Uri(type);
return(resultSetHandler.CreateLiteralNode(value, uriType));
}
else if (element.Attribute("lang") != null)
{
var lang = element.Attribute("lang").Value;
return(resultSetHandler.CreateLiteralNode(value, lang));
}
else
{
return(resultSetHandler.CreateLiteralNode(value));
}
}
else if (element.Name.LocalName == "unbound")
{
return(null);
}
}
throw new NotImplementedException();
}
/// <summary>
/// Attempts to resolve a QName or URI Token into a URI Node and produces appropriate error messages if this fails
/// </summary>
/// <param name="handler">Results Handler</param>
/// <param name="t">Token to resolve</param>
/// <returns></returns>
/// <remarks>
/// It is <strong>not</strong> recommended to use this overload since an <see cref="IRdfHandler">IRdfHandler</see> cannot resolve QNames
/// </remarks>
internal static INode TryResolveUri(ISparqlResultsHandler handler, IToken t)
{
switch (t.TokenType)
{
case Token.QNAME:
throw new RdfException("Unable to resolve the QName since a Results Handler does not have a Namespace Map that can be used to resolve QNames");
case Token.URI:
try
{
String uri = Tools.ResolveUri(t.Value, String.Empty);
return handler.CreateUriNode(UriFactory.Create(uri));
}
catch (UriFormatException formatEx)
{
throw new RdfParseException("Unable to resolve the URI '" + t.Value + "' due to the following error:\n" + formatEx.Message, t, formatEx);
}
catch (RdfException rdfEx)
{
throw new RdfParseException("Unable to resolve the URI '" + t.Value + "' due to the following error:\n" + rdfEx.Message, t, rdfEx);
}
default:
throw ParserHelper.Error("Unexpected Token '" + t.GetType().ToString() + "' encountered, expected a URI/QName Token to resolve into a URI", t);
}
}
