/// <summary>
/// Constructs querying function for BrightstarDB
/// </summary>
/// <returns>Querying function</returns>
public Func<string, SPARQLQueryResults> GetQueryingFunction()
{
Func<string, SPARQLQueryResults> queringFunction = xquery =>
{
var queryProcessor = new LeviathanQueryProcessor(Dataset);
var dnRdfResultSet = queryProcessor.ProcessQuery(new SparqlQueryParser().ParseFromString(xquery)) as SparqlResultSet;
var results = new SPARQLQueryResults();
foreach (var dnRdfVariable in dnRdfResultSet.Variables)
results.Variables.Add(dnRdfVariable);
foreach (var dnRdfResult in dnRdfResultSet)
{
var result = new SPARQLQueryResult();
foreach (var node in dnRdfResult)
{
ResultBinding binding = null;
if (node.Value.NodeType == VDS.RDF.NodeType.Uri)
{
var uriNode = node.Value as IUriNode;
var iriBinding = new IriBinding();
iriBinding.Iri = uriNode.Uri;
binding = iriBinding;
}
else if (node.Value.NodeType == VDS.RDF.NodeType.Literal)
{
var literalNode = node.Value as ILiteralNode;
var litBinding = new LiteralBinding();
litBinding.DataType = literalNode.DataType;
litBinding.Language = literalNode.Language;
litBinding.Literal = literalNode.Value;
binding = litBinding;
}
else
binding = new LiteralBinding();
binding.Name = node.Key;
result.AddBinding(binding);
}
results.AddResult(result);
}
return results;
};
return queringFunction;
}
/// <summary>
/// Constructs querying function for BrightstarDB
/// </summary>
/// <returns>Querying function</returns>
public Func<string, SPARQLQueryResults> GetQueryingFunction()
{
Func<string, SPARQLQueryResults> queringFunction = xquery =>
{
var settings = new XmlReaderSettings();
settings.ConformanceLevel = ConformanceLevel.Auto;
settings.IgnoreComments = true;
settings.IgnoreWhitespace = true;
XmlDocument doc = new XmlDocument();
var reader = XmlReader.Create(Client.ExecuteQuery(StoreName, xquery, resultsFormat: SparqlResultsFormat.Xml), settings);
var root = XElement.Load(reader, LoadOptions.None);
var resultSet = new SPARQLQueryResults();
var head = root.Elements().First(x => x.Name.LocalName.ToLower() == "head");
foreach (var variableElement in head.Elements())
{
if (variableElement.Name.LocalName.ToLower() != "variable")
continue;
var variable = variableElement.Attributes().FirstOrDefault(attr => attr.Name.LocalName.ToLower() == "name");
if (variable!=null)
resultSet.Variables.Add(variable.Value);
}
var results = root.Elements().First(x => x.Name.LocalName.ToLower() == "results");
foreach (var resultElement in results.Elements())
{
var result = new SPARQLQueryResult();
foreach (var bindingElement in resultElement.Elements())
{
var valueElement = bindingElement.Elements().First();
ResultBinding binding = null;
if (valueElement.Name.LocalName.ToLower() == "literal")
{
var literalBinding = new LiteralBinding();
literalBinding.Literal = valueElement.Value;
binding = literalBinding;
var attribute = valueElement.Attributes().FirstOrDefault(attr => attr.Name.LocalName.ToLower() == "datatype");
if (attribute != null)
literalBinding.DataType = new Uri(attribute.Value);
attribute = valueElement.Attributes().FirstOrDefault(attr => attr.Name.LocalName.ToLower() == "lang");
if (attribute != null)
literalBinding.Language = attribute.Value;
}
else if (valueElement.Name.LocalName.ToLower() == "uri")
{
var iriBinding = new IriBinding();
iriBinding.Iri = new Uri(valueElement.Value);
binding = iriBinding;
}
binding.Name = bindingElement.Attributes().First(attr => attr.Name.LocalName.ToLower() == "name").Value;
result.AddBinding(binding);
}
resultSet.AddResult(result);
}
return resultSet;
};
return queringFunction;
}