/// <summary>
/// Generates a SPARQL Service Description Graph for the given Update Handler Configuration or uses the configuration supplied Description Graph
/// </summary>
/// <param name="context">HTTP Context</param>
/// <param name="config">Update Handler Configuration</param>
/// <param name="descripUri">Base URI of the Description</param>
/// <returns></returns>
public static IGraph GetServiceDescription(HttpContext context, BaseUpdateHandlerConfiguration config, Uri descripUri)
{
//Use user specified Service Description if present
if (config.ServiceDescription != null)
{
return(config.ServiceDescription);
}
IGraph g = SparqlServiceDescriber.GetNewGraph();
//Add the Top Level Node representing the Service
IUriNode descrip = g.CreateUriNode(descripUri);
IUriNode rdfType = g.CreateUriNode(new Uri(RdfSpecsHelper.RdfType));
IUriNode service = g.CreateUriNode("sd:" + ClassService);
g.Assert(descrip, rdfType, service);
//Add its sd:url
IUriNode url = g.CreateUriNode("sd:" + PropertyUrl);
g.Assert(descrip, url, descrip);
//Add the sd:supportedLanguage
IUriNode supportedLang = g.CreateUriNode("sd:" + PropertySupportedLanguage);
g.Assert(descrip, supportedLang, g.CreateUriNode("sd:" + InstanceSparql11Update));
//Add Features and Dataset Description
//First add descriptions for Global Expression Factories
IUriNode extensionFunction = g.CreateUriNode("sd:" + PropertyExtensionFunction);
IUriNode extensionAggregate = g.CreateUriNode("sd:" + PropertyExtensionAggregate);
foreach (ISparqlCustomExpressionFactory factory in SparqlExpressionFactory.Factories)
{
foreach (Uri u in factory.AvailableExtensionFunctions)
{
g.Assert(descrip, extensionFunction, g.CreateUriNode(u));
}
foreach (Uri u in factory.AvailableExtensionAggregates)
{
g.Assert(descrip, extensionAggregate, g.CreateUriNode(u));
}
}
//Then get the Configuration Object to add any other Feature Descriptions it wishes to
config.AddFeatureDescription(g, descrip);
return(g);
}
