/// <summary>
        /// Tries to load a Generic IO Manager 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)
        {
            IStorageProvider          storageProvider = null;
            IStorageServer            storageServer   = null;
            SparqlConnectorLoadMethod loadMode;

            obj = null;

            String server, user, pwd, store, catalog, loadModeRaw;

            Object temp;
            INode  storeObj;

            // Create the URI Nodes we're going to use to search for things
            INode propServer          = g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyServer)),
                  propDb              = g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyDatabase)),
                  propStore           = g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyStore)),
                  propAsync           = g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyAsync)),
                  propStorageProvider = g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyStorageProvider));

            switch (targetType.FullName)
            {
            case AllegroGraph:
                // Get the Server, Catalog and Store
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                catalog = ConfigurationLoader.GetConfigurationString(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyCatalog)));
                store   = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }

                // Get User Credentials
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                if (user != null && pwd != null)
                {
                    storageProvider = new AllegroGraphConnector(server, catalog, store, user, pwd);
                }
                else
                {
                    storageProvider = new AllegroGraphConnector(server, catalog, store);
                }
                break;

            case AllegroGraphServer:
                // Get the Server, Catalog and User Credentials
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                catalog = ConfigurationLoader.GetConfigurationString(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyCatalog)));
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                if (user != null && pwd != null)
                {
                    storageServer = new AllegroGraphServer(server, catalog, user, pwd);
                }
                else
                {
                    storageServer = new AllegroGraphServer(server, catalog);
                }
                break;

            case DatasetFile:
                // Get the Filename and whether the loading should be done asynchronously
                String file = ConfigurationLoader.GetConfigurationString(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyFromFile)));
                if (file == null)
                {
                    return(false);
                }
                file = ConfigurationLoader.ResolvePath(file);
                bool isAsync = ConfigurationLoader.GetConfigurationBoolean(g, objNode, propAsync, false);
                storageProvider = new DatasetFileManager(file, isAsync);
                break;

            case Dydra:
                throw new DotNetRdfConfigurationException("DydraConnector is no longer supported by dotNetRDF and is considered obsolete");

            case FourStore:
                // Get the Server and whether Updates are enabled
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                bool enableUpdates = ConfigurationLoader.GetConfigurationBoolean(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyEnableUpdates)), true);
                storageProvider = new FourStoreConnector(server, enableUpdates);
                break;

            case Fuseki:
                // Get the Server URI
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                storageProvider = new FusekiConnector(server);
                break;

            case InMemory:
                // Get the Dataset/Store
                INode datasetObj = ConfigurationLoader.GetConfigurationNode(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyUsingDataset)));
                if (datasetObj != null)
                {
                    temp = ConfigurationLoader.LoadObject(g, datasetObj);
                    if (temp is ISparqlDataset)
                    {
                        storageProvider = new InMemoryManager((ISparqlDataset)temp);
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the In-Memory Manager identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:usingDataset property points to an Object that cannot be loaded as an object which implements the ISparqlDataset interface");
                    }
                }
                else
                {
                    // If no dnr:usingDataset try dnr:usingStore instead
                    storeObj = ConfigurationLoader.GetConfigurationNode(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyUsingStore)));
                    if (storeObj != null)
                    {
                        temp = ConfigurationLoader.LoadObject(g, storeObj);
                        if (temp is IInMemoryQueryableStore)
                        {
                            storageProvider = new InMemoryManager((IInMemoryQueryableStore)temp);
                        }
                        else
                        {
                            throw new DotNetRdfConfigurationException("Unable to load the In-Memory Manager identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:usingStore property points to an Object that cannot be loaded as an object which implements the IInMemoryQueryableStore interface");
                        }
                    }
                    else
                    {
                        // If no dnr:usingStore either then create a new empty store
                        storageProvider = new InMemoryManager();
                    }
                }
                break;

            case ReadOnly:
                // Get the actual Manager we are wrapping
                storeObj = ConfigurationLoader.GetConfigurationNode(g, objNode, propStorageProvider);
                temp     = ConfigurationLoader.LoadObject(g, storeObj);
                if (temp is IStorageProvider)
                {
                    storageProvider = new ReadOnlyConnector((IStorageProvider)temp);
                }
                else
                {
                    throw new DotNetRdfConfigurationException("Unable to load the Read-Only Connector identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:genericManager property points to an Object which cannot be loaded as an object which implements the required IStorageProvider interface");
                }
                break;

            case ReadOnlyQueryable:
                // Get the actual Manager we are wrapping
                storeObj = ConfigurationLoader.GetConfigurationNode(g, objNode, propStorageProvider);
                temp     = ConfigurationLoader.LoadObject(g, storeObj);
                if (temp is IQueryableStorage)
                {
                    storageProvider = new QueryableReadOnlyConnector((IQueryableStorage)temp);
                }
                else
                {
                    throw new DotNetRdfConfigurationException("Unable to load the Queryable Read-Only Connector identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:genericManager property points to an Object which cannot be loaded as an object which implements the required IQueryableStorage interface");
                }
                break;

            case Sesame:
            case SesameV5:
            case SesameV6:
                // Get the Server and Store ID
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                store = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);
                if (user != null && pwd != null)
                {
                    storageProvider = (IStorageProvider)Activator.CreateInstance(targetType, new Object[] { server, store, user, pwd });
                }
                else
                {
                    storageProvider = (IStorageProvider)Activator.CreateInstance(targetType, new Object[] { server, store });
                }
                break;

            case SesameServer:
                // Get the Server and User Credentials
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                if (user != null && pwd != null)
                {
                    storageServer = new SesameServer(server, user, pwd);
                }
                else
                {
                    storageServer = new SesameServer(server);
                }
                break;

            case Sparql:
                // Get the Endpoint URI or the Endpoint
                server = ConfigurationLoader.GetConfigurationString(g, objNode, new INode[] { g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyQueryEndpointUri)), g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyEndpointUri)) });

                // What's the load mode?
                loadModeRaw = ConfigurationLoader.GetConfigurationString(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyLoadMode)));
                loadMode    = SparqlConnectorLoadMethod.Construct;
                if (loadModeRaw != null)
                {
                    try
                    {
                        loadMode = (SparqlConnectorLoadMethod)Enum.Parse(typeof(SparqlConnectorLoadMethod), loadModeRaw);
                    }
                    catch
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the SparqlConnector identified by the Node '" + objNode.ToString() + "' as the value given for the property dnr:loadMode is not valid");
                    }
                }

                if (server == null)
                {
                    INode endpointObj = ConfigurationLoader.GetConfigurationNode(g, objNode, new INode[] { g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyQueryEndpoint)), g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyEndpoint)) });
                    if (endpointObj == null)
                    {
                        return(false);
                    }
                    temp = ConfigurationLoader.LoadObject(g, endpointObj);
                    if (temp is SparqlRemoteEndpoint)
                    {
                        storageProvider = new SparqlConnector((SparqlRemoteEndpoint)temp, loadMode);
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the SparqlConnector identified by the Node '" + objNode.ToString() + "' as the value given for the property dnr:endpoint points to an Object which cannot be loaded as an object which is of the type SparqlRemoteEndpoint");
                    }
                }
                else
                {
                    // Are there any Named/Default Graph URIs
                    IEnumerable <Uri> defGraphs = from def in ConfigurationLoader.GetConfigurationData(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyDefaultGraphUri)))
                                                  where def.NodeType == NodeType.Uri
                                                  select((IUriNode)def).Uri;

                    IEnumerable <Uri> namedGraphs = from named in ConfigurationLoader.GetConfigurationData(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyNamedGraphUri)))
                                                    where named.NodeType == NodeType.Uri
                                                    select((IUriNode)named).Uri;

                    if (defGraphs.Any() || namedGraphs.Any())
                    {
                        storageProvider = new SparqlConnector(new SparqlRemoteEndpoint(UriFactory.Create(server), defGraphs, namedGraphs), loadMode);
                    }
                    else
                    {
                        storageProvider = new SparqlConnector(UriFactory.Create(server), loadMode);
                    }
                }
                break;

            case ReadWriteSparql:
                SparqlRemoteEndpoint       queryEndpoint;
                SparqlRemoteUpdateEndpoint updateEndpoint;

                // Get the Query Endpoint URI or the Endpoint
                server = ConfigurationLoader.GetConfigurationString(g, objNode, new INode[] { g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyUpdateEndpointUri)), g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyEndpointUri)) });

                // What's the load mode?
                loadModeRaw = ConfigurationLoader.GetConfigurationString(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyLoadMode)));
                loadMode    = SparqlConnectorLoadMethod.Construct;
                if (loadModeRaw != null)
                {
                    try
                    {
                        loadMode = (SparqlConnectorLoadMethod)Enum.Parse(typeof(SparqlConnectorLoadMethod), loadModeRaw);
                    }
                    catch
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the ReadWriteSparqlConnector identified by the Node '" + objNode.ToString() + "' as the value given for the property dnr:loadMode is not valid");
                    }
                }

                if (server == null)
                {
                    INode endpointObj = ConfigurationLoader.GetConfigurationNode(g, objNode, new INode[] { g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyQueryEndpoint)), g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyEndpoint)) });
                    if (endpointObj == null)
                    {
                        return(false);
                    }
                    temp = ConfigurationLoader.LoadObject(g, endpointObj);
                    if (temp is SparqlRemoteEndpoint)
                    {
                        queryEndpoint = (SparqlRemoteEndpoint)temp;
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the ReadWriteSparqlConnector identified by the Node '" + objNode.ToString() + "' as the value given for the property dnr:queryEndpoint/dnr:endpoint points to an Object which cannot be loaded as an object which is of the type SparqlRemoteEndpoint");
                    }
                }
                else
                {
                    // Are there any Named/Default Graph URIs
                    IEnumerable <Uri> defGraphs = from def in ConfigurationLoader.GetConfigurationData(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyDefaultGraphUri)))
                                                  where def.NodeType == NodeType.Uri
                                                  select((IUriNode)def).Uri;

                    IEnumerable <Uri> namedGraphs = from named in ConfigurationLoader.GetConfigurationData(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyNamedGraphUri)))
                                                    where named.NodeType == NodeType.Uri
                                                    select((IUriNode)named).Uri;

                    if (defGraphs.Any() || namedGraphs.Any())
                    {
                        queryEndpoint = new SparqlRemoteEndpoint(UriFactory.Create(server), defGraphs, namedGraphs);
                        ;
                    }
                    else
                    {
                        queryEndpoint = new SparqlRemoteEndpoint(UriFactory.Create(server));
                    }
                }

                // Find the Update Endpoint or Endpoint URI
                server = ConfigurationLoader.GetConfigurationString(g, objNode, new INode[] { g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyUpdateEndpointUri)), g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyEndpointUri)) });

                if (server == null)
                {
                    INode endpointObj = ConfigurationLoader.GetConfigurationNode(g, objNode, new INode[] { g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyUpdateEndpoint)), g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyEndpoint)) });
                    if (endpointObj == null)
                    {
                        return(false);
                    }
                    temp = ConfigurationLoader.LoadObject(g, endpointObj);
                    if (temp is SparqlRemoteUpdateEndpoint)
                    {
                        updateEndpoint = (SparqlRemoteUpdateEndpoint)temp;
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the ReadWriteSparqlConnector identified by the Node '" + objNode.ToString() + "' as the value given for the property dnr:updateEndpoint/dnr:endpoint points to an Object which cannot be loaded as an object which is of the type SparqlRemoteUpdateEndpoint");
                    }
                }
                else
                {
                    updateEndpoint = new SparqlRemoteUpdateEndpoint(UriFactory.Create(server));
                }
                storageProvider = new ReadWriteSparqlConnector(queryEndpoint, updateEndpoint, loadMode);
                break;

            case SparqlHttpProtocol:
                // Get the Service URI
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                storageProvider = new SparqlHttpProtocolConnector(UriFactory.Create(server));
                break;

            case Stardog:
            case StardogV1:
            case StardogV2:
            case StardogV3:
                // Get the Server and Store
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                store = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }

                // Get User Credentials
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                // Get Reasoning Mode
                StardogReasoningMode reasoning = StardogReasoningMode.None;
                String mode = ConfigurationLoader.GetConfigurationString(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyLoadMode)));
                if (mode != null)
                {
                    try
                    {
                        reasoning = (StardogReasoningMode)Enum.Parse(typeof(StardogReasoningMode), mode, true);
                    }
                    catch
                    {
                        reasoning = StardogReasoningMode.None;
                    }
                }

                if (user != null && pwd != null)
                {
                    switch (targetType.FullName)
                    {
                    case StardogV1:
                        storageProvider = new StardogV1Connector(server, store, reasoning, user, pwd);
                        break;

                    case StardogV2:
                        storageProvider = new StardogV2Connector(server, store, reasoning, user, pwd);
                        break;

                    case StardogV3:
                        storageProvider = new StardogV3Connector(server, store, user, pwd);
                        break;

                    case Stardog:
                    default:
                        storageProvider = new StardogConnector(server, store, user, pwd);
                        break;
                    }
                }
                else
                {
                    switch (targetType.FullName)
                    {
                    case StardogV1:
                        storageProvider = new StardogV1Connector(server, store, reasoning);
                        break;

                    case StardogV2:
                        storageProvider = new StardogV2Connector(server, store, reasoning);
                        break;

                    case StardogV3:
                        storageProvider = new StardogV3Connector(server, store);
                        break;

                    case Stardog:
                    default:
                        storageProvider = new StardogConnector(server, store);
                        break;
                    }
                }
                break;

            case StardogServer:
            case StardogServerV1:
            case StardogServerV2:
            case StardogServerV3:
                // Get the Server and User Credentials
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                if (user != null && pwd != null)
                {
                    switch (targetType.FullName)
                    {
                    case StardogServerV1:
                        storageServer = new StardogV1Server(server, user, pwd);
                        break;

                    case StardogServerV2:
                        storageServer = new StardogV2Server(server, user, pwd);
                        break;

                    case StardogServerV3:
                        storageServer = new StardogV3Server(server, user, pwd);
                        break;

                    case StardogServer:
                    default:
                        storageServer = new StardogServer(server, user, pwd);
                        break;
                    }
                }
                else
                {
                    switch (targetType.FullName)
                    {
                    case StardogServerV1:
                        storageServer = new StardogV1Server(server);
                        break;

                    case StardogServerV2:
                        storageServer = new StardogV2Server(server);
                        break;

                    case StardogServerV3:
                        storageServer = new StardogV3Server(server);
                        break;

                    case StardogServer:
                    default:
                        storageServer = new StardogServer(server);
                        break;
                    }
                }
                break;
            }

            // Set the return object if one has been loaded
            if (storageProvider != null)
            {
                obj = storageProvider;
            }
            else if (storageServer != null)
            {
                obj = storageServer;
            }

            // Check whether this is a standard HTTP manager and if so load standard configuration
            if (obj is BaseHttpConnector)
            {
                BaseHttpConnector connector = (BaseHttpConnector)obj;

                int timeout = ConfigurationLoader.GetConfigurationInt32(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyTimeout)), 0);
                if (timeout > 0)
                {
                    connector.Timeout = timeout;
                }
                INode proxyNode = ConfigurationLoader.GetConfigurationNode(g, objNode, g.CreateUriNode(UriFactory.Create(ConfigurationLoader.PropertyProxy)));
                if (proxyNode != null)
                {
                    temp = ConfigurationLoader.LoadObject(g, proxyNode);
                    if (temp is IWebProxy)
                    {
                        connector.Proxy = (IWebProxy)temp;
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load storage provider/server identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:proxy property pointed to an Object which could not be loaded as an object of the required type WebProxy");
                    }
                }
            }

            return(obj != null);
        }
Beispiel #2
0
        /// <summary>
        /// Tries to load a Generic IO Manager 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)
        {
            IGenericIOManager manager = null;

            obj = null;

            String server, user, pwd, store;
            bool   isAsync;

            Object temp;
            INode  storeObj;

            //Create the URI Nodes we're going to use to search for things
            INode propServer = ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyServer),
                  propDb     = ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyDatabase),
                  propStore  = ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyStore),
                  propAsync  = ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyAsync);

            switch (targetType.FullName)
            {
#if !NO_SYNC_HTTP
            case AllegroGraph:
                //Get the Server, Catalog and Store
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                String catalog = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyCatalog));
                store = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }

                //Get User Credentials
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                if (user != null && pwd != null)
                {
                    manager = new AllegroGraphConnector(server, catalog, store, user, pwd);
                }
                else
                {
                    manager = new AllegroGraphConnector(server, catalog, store);
                }
                break;
#endif

            case DatasetFile:
                //Get the Filename and whether the loading should be done asynchronously
                String file = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyFromFile));
                if (file == null)
                {
                    return(false);
                }
                file    = ConfigurationLoader.ResolvePath(file);
                isAsync = ConfigurationLoader.GetConfigurationBoolean(g, objNode, propAsync, false);
                manager = new DatasetFileManager(file, isAsync);
                break;

#if !NO_SYNC_HTTP
            case Dydra:
                //Get the Account Name and Store
                String account = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyCatalog));
                if (account == null)
                {
                    return(false);
                }
                store = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }

                //Get User Credentials
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                if (user != null)
                {
                    manager = new DydraConnector(account, store, user);
                }
                else
                {
                    manager = new DydraConnector(account, store);
                }
                break;

            case FourStore:
                //Get the Server and whether Updates are enabled
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                bool enableUpdates = ConfigurationLoader.GetConfigurationBoolean(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyEnableUpdates), true);
                manager = new FourStoreConnector(server, enableUpdates);
                break;

            case Fuseki:
                //Get the Server URI
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                manager = new FusekiConnector(server);
                break;
#endif

            case InMemory:
                //Get the Dataset/Store
                INode datasetObj = ConfigurationLoader.GetConfigurationNode(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyUsingDataset));
                if (datasetObj != null)
                {
                    temp = ConfigurationLoader.LoadObject(g, datasetObj);
                    if (temp is ISparqlDataset)
                    {
                        manager = new InMemoryManager((ISparqlDataset)temp);
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the In-Memory Manager identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:usingDataset property points to an Object that cannot be loaded as an object which implements the ISparqlDataset interface");
                    }
                }
                else
                {
                    //If no dnr:usingDataset try dnr:usingStore instead
                    storeObj = ConfigurationLoader.GetConfigurationNode(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyUsingStore));
                    if (storeObj != null)
                    {
                        temp = ConfigurationLoader.LoadObject(g, storeObj);
                        if (temp is IInMemoryQueryableStore)
                        {
                            manager = new InMemoryManager((IInMemoryQueryableStore)temp);
                        }
                        else
                        {
                            throw new DotNetRdfConfigurationException("Unable to load the In-Memory Manager identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:usingStore property points to an Object that cannot be loaded as an object which implements the IInMemoryQueryableStore interface");
                        }
                    }
                    else
                    {
                        //If no dnr:usingStore either then create a new empty store
                        manager = new InMemoryManager();
                    }
                }
                break;

#if !NO_SYNC_HTTP
            case Joseki:
                //Get the Query and Update URIs
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                String queryService = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyQueryPath));
                if (queryService == null)
                {
                    return(false);
                }
                String updateService = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyUpdatePath));
                if (updateService == null)
                {
                    manager = new JosekiConnector(server, queryService);
                }
                else
                {
                    manager = new JosekiConnector(server, queryService, updateService);
                }
                break;
#endif

            case ReadOnly:
                //Get the actual Manager we are wrapping
                storeObj = ConfigurationLoader.GetConfigurationNode(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyGenericManager));
                temp     = ConfigurationLoader.LoadObject(g, storeObj);
                if (temp is IGenericIOManager)
                {
                    manager = new ReadOnlyConnector((IGenericIOManager)temp);
                }
                else
                {
                    throw new DotNetRdfConfigurationException("Unable to load the Read-Only Connector identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:genericManager property points to an Object which cannot be loaded as an object which implements the required IGenericIOManager interface");
                }
                break;

            case ReadOnlyQueryable:
                //Get the actual Manager we are wrapping
                storeObj = ConfigurationLoader.GetConfigurationNode(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyGenericManager));
                temp     = ConfigurationLoader.LoadObject(g, storeObj);
                if (temp is IQueryableGenericIOManager)
                {
                    manager = new QueryableReadOnlyConnector((IQueryableGenericIOManager)temp);
                }
                else
                {
                    throw new DotNetRdfConfigurationException("Unable to load the Queryable Read-Only Connector identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:genericManager property points to an Object which cannot be loaded as an object which implements the required IQueryableGenericIOManager interface");
                }
                break;

#if !NO_SYNC_HTTP
            case Sesame:
            case SesameV5:
            case SesameV6:
                //Get the Server and Store ID
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                store = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);
                if (user != null && pwd != null)
                {
                    manager = (IGenericIOManager)Activator.CreateInstance(targetType, new Object[] { server, store, user, pwd });
                }
                else
                {
                    manager = (IGenericIOManager)Activator.CreateInstance(targetType, new Object[] { server, store });
                }
                break;

            case Sparql:
                //Get the Endpoint URI or the Endpoint
                server = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyEndpointUri));

                //What's the load mode?
                String loadModeRaw = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyLoadMode));
                SparqlConnectorLoadMethod loadMode = SparqlConnectorLoadMethod.Construct;
                if (loadModeRaw != null)
                {
                    try
                    {
#if SILVERLIGHT
                        loadMode = (SparqlConnectorLoadMethod)Enum.Parse(typeof(SparqlConnectorLoadMethod), loadModeRaw, false);
#else
                        loadMode = (SparqlConnectorLoadMethod)Enum.Parse(typeof(SparqlConnectorLoadMethod), loadModeRaw);
#endif
                    }
                    catch
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the SparqlConnector identified by the Node '" + objNode.ToString() + "' as the value given for the property dnr:loadMode is not valid");
                    }
                }

                if (server == null)
                {
                    INode endpointObj = ConfigurationLoader.GetConfigurationNode(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyEndpoint));
                    if (endpointObj == null)
                    {
                        return(false);
                    }
                    temp = ConfigurationLoader.LoadObject(g, endpointObj);
                    if (temp is SparqlRemoteEndpoint)
                    {
                        manager = new SparqlConnector((SparqlRemoteEndpoint)temp, loadMode);
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load the SparqlConnector identified by the Node '" + objNode.ToString() + "' as the value given for the property dnr:endpoint points to an Object which cannot be loaded as an object which is of the type SparqlRemoteEndpoint");
                    }
                }
                else
                {
                    //Are there any Named/Default Graph URIs
                    IEnumerable <Uri> defGraphs = from def in ConfigurationLoader.GetConfigurationData(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyDefaultGraphUri))
                                                  where def.NodeType == NodeType.Uri
                                                  select((IUriNode)def).Uri;

                    IEnumerable <Uri> namedGraphs = from named in ConfigurationLoader.GetConfigurationData(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyNamedGraphUri))
                                                    where named.NodeType == NodeType.Uri
                                                    select((IUriNode)named).Uri;

                    if (defGraphs.Any() || namedGraphs.Any())
                    {
                        manager = new SparqlConnector(new SparqlRemoteEndpoint(UriFactory.Create(server), defGraphs, namedGraphs), loadMode);
                    }
                    else
                    {
                        manager = new SparqlConnector(UriFactory.Create(server), loadMode);
                    }
                }
                break;

            case SparqlHttpProtocol:
                //Get the Service URI
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                manager = new SparqlHttpProtocolConnector(UriFactory.Create(server));
                break;

            case Stardog:
                //Get the Server and Store
                server = ConfigurationLoader.GetConfigurationString(g, objNode, propServer);
                if (server == null)
                {
                    return(false);
                }
                store = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }

                //Get User Credentials
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);

                //Get Reasoning Mode
                StardogReasoningMode reasoning = StardogReasoningMode.None;
                String mode = ConfigurationLoader.GetConfigurationString(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyLoadMode));
                if (mode != null)
                {
                    try
                    {
                        reasoning = (StardogReasoningMode)Enum.Parse(typeof(StardogReasoningMode), mode);
                    }
                    catch
                    {
                        reasoning = StardogReasoningMode.None;
                    }
                }

                if (user != null && pwd != null)
                {
                    manager = new StardogConnector(server, store, reasoning, user, pwd);
                }
                else
                {
                    manager = new StardogConnector(server, store, reasoning);
                }
                break;

            case Talis:
                //Get the Store Name and User credentials
                store = ConfigurationLoader.GetConfigurationString(g, objNode, propStore);
                if (store == null)
                {
                    return(false);
                }
                ConfigurationLoader.GetUsernameAndPassword(g, objNode, true, out user, out pwd);
                if (user != null && pwd != null)
                {
                    manager = new TalisPlatformConnector(store, user, pwd);
                }
                else
                {
                    manager = new TalisPlatformConnector(store);
                }
                break;
#endif
            }

#if !NO_PROXY
            //Check whether this is a proxyable manager and if we need to load proxy settings
            if (manager is BaseHttpConnector)
            {
                INode proxyNode = ConfigurationLoader.GetConfigurationNode(g, objNode, ConfigurationLoader.CreateConfigurationNode(g, ConfigurationLoader.PropertyProxy));
                if (proxyNode != null)
                {
                    temp = ConfigurationLoader.LoadObject(g, proxyNode);
                    if (temp is WebProxy)
                    {
                        ((BaseHttpConnector)manager).Proxy = (WebProxy)temp;
                    }
                    else
                    {
                        throw new DotNetRdfConfigurationException("Unable to load Generic Manager identified by the Node '" + objNode.ToString() + "' as the value given for the dnr:proxy property pointed to an Object which could not be loaded as an object of the required type WebProxy");
                    }
                }
            }
#endif

            obj = manager;
            return(manager != null);
        }