/// <summary>
/// Tries to load a Triple Store based on information from the Configuration Graph
/// </summary>
/// <param name="g">Configuration Graph</param>
/// <param name="objNode">Object Node</param>
/// <param name="targetType">Target Type</param>
/// <param name="obj">Output Object</param>
/// <returns></returns>
public bool TryLoadObject(IGraph g, INode objNode, Type targetType, out object obj)
{
obj = null;
ITripleStore store = null;
INode subObj;
bool async;
Object temp;
//Get Property Nodes we need
INode propSqlManager = ConfigurationLoader.CreateConfigurationNode(g, "dnr:sqlManager"),
propGenericManager = ConfigurationLoader.CreateConfigurationNode(g, "dnr:genericManager"),
propAsync = ConfigurationLoader.CreateConfigurationNode(g, "dnr:async");
//Instantiate the Store Class
switch (targetType.FullName)
{
case TripleStore:
store = new TripleStore();
break;
case WebDemandTripleStore:
store = new WebDemandTripleStore();
break;
#if !NO_DATA && !NO_STORAGE
case SqlTripleStore:
case ThreadedSqlTripleStore:
case OnDemandTripleStore:
subObj = ConfigurationLoader.GetConfigurationNode(g, objNode, propSqlManager);
if (subObj == null) return false;
temp = ConfigurationLoader.LoadObject(g, subObj);
if (temp is ISqlIOManager)
{
if (targetType.FullName.Equals(SqlTripleStore))
{
store = new SqlTripleStore((ISqlIOManager)temp);
}
else if (targetType.FullName.Equals(OnDemandTripleStore))
{
store = new OnDemandTripleStore((ISqlIOManager)temp);
}
else if (temp is IThreadedSqlIOManager)
{
async = ConfigurationLoader.GetConfigurationBoolean(g, objNode, propAsync, false);
store = new ThreadedSqlTripleStore((IThreadedSqlIOManager)temp, async);
}
else
{
throw new DotNetRdfConfigurationException("Unable to load a SQL Triple Store identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:sqlManager property points to an Object which could not be loaded as an object which implements either the ISqlIOManager/IThreadedSqlIOManager interface");
}
}
else
{
throw new DotNetRdfConfigurationException("Unable to load a SQL Triple Store identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:sqlManager property points to an Object which could not be loaded as an object which implements either the ISqlIOManager interface");
}
break;
#endif
#if !NO_STORAGE
case NativeTripleStore:
subObj = ConfigurationLoader.GetConfigurationNode(g, objNode, propGenericManager);
if (subObj == null) return false;
temp = ConfigurationLoader.LoadObject(g, subObj);
if (temp is IQueryableGenericIOManager)
{
store = new NativeTripleStore((IQueryableGenericIOManager)temp);
}
else
{
throw new DotNetRdfConfigurationException("Unable to load a Native Triple Store identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:genericManager property points to an Object which could not be loaded as an object which implements the IQueryableGenericIOManager interface");
}
break;
#endif
}
//Read in additional data to be added to the Store
if (store != null)
{
IEnumerable<INode> sources = ConfigurationLoader.GetConfigurationData(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, "dnr:usingGraph"));
//Read from Graphs
foreach (INode source in sources)
{
temp = ConfigurationLoader.LoadObject(g, source);
if (temp is IGraph)
{
store.Add((IGraph)temp);
}
else
{
throw new DotNetRdfConfigurationException("Unable to load data from a Graph for the Triple Store identified by the Node '" + objNode.ToString() + "' as one of the values for the dnr:usingGraph property points to an Object that cannot be loaded as an object which implements the IGraph interface");
}
}
//Load from Embedded Resources
sources = ConfigurationLoader.GetConfigurationData(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyFromEmbedded));
foreach (INode source in sources)
{
if (source.NodeType == NodeType.Literal)
{
EmbeddedResourceLoader.Load(store, ((ILiteralNode)source).Value);
}
else
{
throw new DotNetRdfConfigurationException("Unable to load data from an Embedded Resource for the Graph identified by the Node '" + objNode.ToString() + "' as one of the values for the dnr:fromEmbedded property is not a Literal Node as required");
}
}
//Read from Files - we assume these files are Dataset Files
sources = ConfigurationLoader.GetConfigurationData(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyFromFile));
foreach (INode source in sources)
{
if (source.NodeType == NodeType.Literal)
{
FileLoader.Load(store, ConfigurationLoader.ResolvePath(((ILiteralNode)source).Value));
}
else
{
throw new DotNetRdfConfigurationException("Unable to load data from a file for the Triple Store identified by the Node '" + objNode.ToString() + "' as one of the values for the dnr:fromFile property is not a Literal Node as required");
}
}
//Finally we'll apply any reasoners
if (store is IInferencingTripleStore)
{
IEnumerable<INode> reasoners = ConfigurationLoader.GetConfigurationData(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyReasoner));
foreach (INode reasoner in reasoners)
{
temp = ConfigurationLoader.LoadObject(g, reasoner);
if (temp is IInferenceEngine)
{
((IInferencingTripleStore)store).AddInferenceEngine((IInferenceEngine)temp);
}
else
{
throw new DotNetRdfConfigurationException("Unable to apply a reasoner for the Graph identified by the Node '" + objNode.ToString() + "' as one of the values for the dnr:reasoner property points to an Object which cannot be loaded as an object which implements the IInferenceEngine interface");
}
}
}
}
obj = store;
return (store != null);
}
public void SparqlViewNativeAllegroGraph()
{
try
{
AllegroGraphConnector agraph = new AllegroGraphConnector("http://localhost:9875", "test", "unit-test");
NativeTripleStore store = new NativeTripleStore(agraph);
//Load a Graph into the Store to ensure there is some data for the view to retrieve
Graph g = new Graph();
FileLoader.Load(g, "InferenceTest.ttl");
agraph.SaveGraph(g);
//Create the SPARQL View
NativeSparqlView view = new NativeSparqlView("CONSTRUCT { ?s ?p ?o } WHERE { ?s ?p ?o . FILTER(IsLiteral(?o)) }", store);
Console.WriteLine("SPARQL View Populated");
TestTools.ShowGraph(view);
Console.WriteLine();
}
catch (RdfQueryException queryEx)
{
TestTools.ReportError("Query Error", queryEx, true);
}
catch (RdfException ex)
{
TestTools.ReportError("Error", ex, true);
}
}
