C# Graph.CreateLiteralNode方法代码示例

        public override bool Execute(PipelinePackage package, PackagePipelineContext context)
        {
            DateTime? commitTimeStamp = PackagePipelineHelpers.GetCommitTimeStamp(context);
            Guid? commitId = PackagePipelineHelpers.GetCommitId(context);

            IGraph graph = new Graph();

            INode resource = graph.CreateUriNode(context.Uri);

            if (commitTimeStamp != null)
            {
                graph.Assert(
                    resource,
                    graph.CreateUriNode(Schema.Predicates.CatalogTimeStamp),
                    graph.CreateLiteralNode(commitTimeStamp.Value.ToString("O"), Schema.DataTypes.DateTime));
            }

            if (commitId != null)
            {
                graph.Assert(
                    resource,
                    graph.CreateUriNode(Schema.Predicates.CatalogCommitId),
                    graph.CreateLiteralNode(commitId.Value.ToString()));
            }

            context.StageResults.Add(new GraphPackageMetadata(graph));

            return true;
        }

        public void WritingBlankNodeOutput()
        {
            //Create a Graph and add a couple of Triples which when serialized have
            //potentially colliding IDs

            Graph g = new Graph();
            g.NamespaceMap.AddNamespace("ex", new Uri("http://example.org"));
            IUriNode subj = g.CreateUriNode("ex:subject");
            IUriNode pred = g.CreateUriNode("ex:predicate");
            IUriNode name = g.CreateUriNode("ex:name");
            IBlankNode b1 = g.CreateBlankNode("autos1");
            IBlankNode b2 = g.CreateBlankNode("1");

            g.Assert(subj, pred, b1);
            g.Assert(b1, name, g.CreateLiteralNode("First Triple"));
            g.Assert(subj, pred, b2);
            g.Assert(b2, name, g.CreateLiteralNode("Second Triple"));

            TurtleWriter ttlwriter = new TurtleWriter();
            ttlwriter.Save(g, "bnode-output-test.ttl");

            TestTools.ShowGraph(g);

            TurtleParser ttlparser = new TurtleParser();
            Graph h = new Graph();
            ttlparser.Load(h, "bnode-output-test.ttl");

            TestTools.ShowGraph(h);

            Assert.AreEqual(g.Triples.Count, h.Triples.Count, "Expected same number of Triples after serialization and reparsing");

        }

    public static void Main(String[] args) 
    {
	    //Fill in the code shown on this page here to build your hello world application
        Graph g = new Graph();

        IUriNode dotNetRDF = g.CreateUriNode(new Uri("http://www.dotnetrdf.org"));
        IUriNode says = g.CreateUriNode(new Uri("http://example.org/says"));
        ILiteralNode helloWorld = g.CreateLiteralNode("Hello World");
        ILiteralNode bonjourMonde = g.CreateLiteralNode("Bonjour tout le Monde", "fr");

        g.Assert(new Triple(dotNetRDF, says, helloWorld));
        g.Assert(new Triple(dotNetRDF, says, bonjourMonde));

        foreach (Triple t in g.Triples)
        {
            Console.WriteLine(t.ToString());
        }

        NTriplesWriter ntwriter = new NTriplesWriter();
        ntwriter.Save(g, "HelloWorld.nt");

        RdfXmlWriter rdfxmlwriter = new RdfXmlWriter();
        rdfxmlwriter.Save(g, "HelloWorld.rdf");

    }

        public static IGraph CreateCommitMetadata(Uri indexUri, CommitMetadata commitMetadata)
        {
            IGraph graph = new Graph();

            if (commitMetadata.LastCreated != null)
            {
                graph.Assert(
                    graph.CreateUriNode(indexUri), 
                    graph.CreateUriNode(Schema.Predicates.LastCreated), 
                    graph.CreateLiteralNode(commitMetadata.LastCreated.Value.ToString("O"), Schema.DataTypes.DateTime));
            }
            if (commitMetadata.LastEdited != null)
            {
                graph.Assert(
                    graph.CreateUriNode(indexUri),
                    graph.CreateUriNode(Schema.Predicates.LastEdited),
                    graph.CreateLiteralNode(commitMetadata.LastEdited.Value.ToString("O"), Schema.DataTypes.DateTime));
            }
            if (commitMetadata.LastDeleted != null)
            {
                graph.Assert(
                    graph.CreateUriNode(indexUri), 
                    graph.CreateUriNode(Schema.Predicates.LastDeleted), 
                    graph.CreateLiteralNode(commitMetadata.LastDeleted.Value.ToString("O"), Schema.DataTypes.DateTime));
            }

            return graph;
        }

        /// <summary>
        /// Adds the literal triple to a graph.
        /// </summary>
        /// <param name="graph">The graph.</param>
        /// <param name="subject">The subject.</param>
        /// <param name="predicate">The predicate.</param>
        /// <param name="obj">The object (resource).</param>
        /// <remarks></remarks>
        public static void AddTripleLiteral(Graph graph, string subject, string predicate, string obj, string datatype)
        {
            string xmlSchemaDatatype;
            switch (datatype)
            {
                case "Url":
                    xmlSchemaDatatype = XmlSpecsHelper.XmlSchemaDataTypeAnyUri;
                    break;
                case "Date":
                    xmlSchemaDatatype = XmlSpecsHelper.XmlSchemaDataTypeDateTime;
                    break;
                case "Integer":
                    xmlSchemaDatatype = XmlSpecsHelper.XmlSchemaDataTypeInteger;
                    break;
                case "Ntext":
                    xmlSchemaDatatype = XmlSpecsHelper.XmlSchemaDataTypeString;
                    break;
                case "Nvarchar":
                    xmlSchemaDatatype = XmlSpecsHelper.XmlSchemaDataTypeString;
                    break;
                default:
                    xmlSchemaDatatype = XmlSpecsHelper.XmlSchemaDataTypeString;
                    break;
            }

            Triple triple = null;
            if (subject.StartsWith("http") && predicate.StartsWith("http"))
            {
                triple = new Triple(
                        graph.CreateUriNode(new Uri(subject)),
                        graph.CreateUriNode(new Uri(predicate)),
                        graph.CreateLiteralNode(obj, new Uri(xmlSchemaDatatype))
                        );
            }
            else if (!subject.StartsWith("http") && predicate.StartsWith("http"))
            {
                triple = new Triple(
                        graph.CreateUriNode(subject),
                        graph.CreateUriNode(new Uri(predicate)),
                        graph.CreateLiteralNode(obj, new Uri(xmlSchemaDatatype))
                        );
            }
            else if (subject.StartsWith("http") && !predicate.StartsWith("http"))
            {
                triple = new Triple(
                        graph.CreateUriNode(new Uri(subject)),
                        graph.CreateUriNode(predicate),
                        graph.CreateLiteralNode(obj, new Uri(xmlSchemaDatatype))
                        );
            }
            else if (!subject.StartsWith("http") && !predicate.StartsWith("http"))
            {
                triple = new Triple(
                        graph.CreateUriNode(subject),
                        graph.CreateUriNode(predicate),
                        graph.CreateLiteralNode(obj, new Uri(xmlSchemaDatatype))
                        );
            }
            graph.Assert(triple);
        }

        public StorageContent CreateContent(CatalogContext context)
        {
            IGraph graph = new Graph();

            INode rdfTypePredicate = graph.CreateUriNode(Schema.Predicates.Type);
            INode timeStampPredicate = graph.CreateUriNode(Schema.Predicates.CatalogTimestamp);
            INode commitIdPredicate = graph.CreateUriNode(Schema.Predicates.CatalogCommitId);

            INode container = graph.CreateUriNode(_resourceUri);

            graph.Assert(container, rdfTypePredicate, graph.CreateUriNode(GetContainerType()));
            graph.Assert(container, timeStampPredicate, graph.CreateLiteralNode(_timeStamp.ToString("O"), Schema.DataTypes.DateTime));
            graph.Assert(container, commitIdPredicate, graph.CreateLiteralNode(_commitId.ToString()));

            if (_parent != null)
            {
                graph.Assert(container, graph.CreateUriNode(Schema.Predicates.Parent), graph.CreateUriNode(_parent));
            }

            AddCustomContent(container, graph);

            INode itemPredicate = graph.CreateUriNode(Schema.Predicates.CatalogItem);
            INode countPredicate = graph.CreateUriNode(Schema.Predicates.CatalogCount);

            foreach (KeyValuePair<Uri, CatalogContainerItem> item in _items)
            {
                INode itemNode = graph.CreateUriNode(item.Key);

                graph.Assert(container, itemPredicate, itemNode);
                graph.Assert(itemNode, rdfTypePredicate, graph.CreateUriNode(item.Value.Type));

                if (item.Value.PageContent != null)
                {
                    graph.Merge(item.Value.PageContent);
                }

                graph.Assert(itemNode, timeStampPredicate, graph.CreateLiteralNode(item.Value.TimeStamp.ToString("O"), Schema.DataTypes.DateTime));
                graph.Assert(itemNode, commitIdPredicate, graph.CreateLiteralNode(item.Value.CommitId.ToString()));

                if (item.Value.Count != null)
                {
                    graph.Assert(itemNode, countPredicate, graph.CreateLiteralNode(item.Value.Count.ToString(), Schema.DataTypes.Integer));
                }
            }

            JObject frame = context.GetJsonLdContext("context.Container.json", GetContainerType());

            // The below code could be used to compact data storage by using relative URIs.
            //frame = (JObject)frame.DeepClone();
            //frame["@context"]["@base"] = _resourceUri.ToString();

            StorageContent content = new StringStorageContent(Utils.CreateJson(graph, frame), "application/json", "no-store");

            return content;
        }

        public string CreateContent(CatalogContext context)
        {
            IGraph graph = new Graph();

            graph.NamespaceMap.AddNamespace("rdf", new Uri("http://www.w3.org/1999/02/22-rdf-syntax-ns#"));
            graph.NamespaceMap.AddNamespace("catalog", new Uri("http://nuget.org/catalog#"));

            INode rdfTypePredicate = graph.CreateUriNode("rdf:type");
            INode timeStampPredicate = graph.CreateUriNode("catalog:timeStamp");

            Uri dateTimeDatatype = new Uri("http://www.w3.org/2001/XMLSchema#dateTime");

            INode container = graph.CreateUriNode(_resourceUri);

            graph.Assert(container, rdfTypePredicate, graph.CreateUriNode(GetContainerType()));
            graph.Assert(container, timeStampPredicate, graph.CreateLiteralNode(_timeStamp.ToString(), dateTimeDatatype));

            if (_parent != null)
            {
                graph.Assert(container, graph.CreateUriNode("catalog:parent"), graph.CreateUriNode(_parent));
            }

            AddCustomContent(container, graph);

            INode itemPredicate = graph.CreateUriNode("catalog:item");
            INode countPredicate = graph.CreateUriNode("catalog:count");

            foreach (KeyValuePair<Uri, Tuple<Uri, IGraph, DateTime, int?>> item in GetItems())
            {
                INode itemNode = graph.CreateUriNode(item.Key);

                graph.Assert(container, itemPredicate, itemNode);
                graph.Assert(itemNode, rdfTypePredicate, graph.CreateUriNode(item.Value.Item1));

                if (item.Value.Item2 != null)
                {
                    graph.Merge(item.Value.Item2);
                }

                graph.Assert(itemNode, timeStampPredicate, graph.CreateLiteralNode(item.Value.Item3.ToString(), dateTimeDatatype));
                if (item.Value.Item4 != null)
                {
                    Uri integerDatatype = new Uri("http://www.w3.org/2001/XMLSchema#integer");
                    graph.Assert(itemNode, countPredicate, graph.CreateLiteralNode(item.Value.Item4.ToString(), integerDatatype));
                }
            }

            JObject frame = context.GetJsonLdContext("context.Container.json", GetContainerType());

            string content = Utils.CreateJson(graph, frame);

            return content;
        }

 public override StorageContent CreateContent(CatalogContext context)
 {
     IGraph graph = new Graph();
     INode subject = graph.CreateUriNode(GetItemAddress());
     graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.Type), graph.CreateUriNode(Schema.DataTypes.Package));
     graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.Type), graph.CreateUriNode(Schema.DataTypes.Permalink));
     graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.CatalogEntry), graph.CreateUriNode(_catalogUri));
     graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.Registration), graph.CreateUriNode(GetRegistrationAddress()));
     graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.PackageContent), graph.CreateUriNode(GetPackageContentAddress()));
     graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.Published), graph.CreateLiteralNode(GetPublishedDate().ToString("O"), Schema.DataTypes.DateTime));
     graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.Listed), graph.CreateLiteralNode(_listed.ToString(), Schema.DataTypes.Boolean));
     JObject frame = context.GetJsonLdContext("context.Package.json", Schema.DataTypes.Package);
     return new JTokenStorageContent(Utils.CreateJson(graph, frame), "application/json", "no-store");
 }

        public override bool Execute(PipelinePackage package, PackagePipelineContext context)
        {
            string hash = GetHash(package.Stream);
            long size = GetSize(package.Stream);

            IGraph graph = new Graph();
            INode subject = graph.CreateUriNode(context.Uri);
            graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.PackageHashAlgorithm), graph.CreateLiteralNode("SHA512"));
            graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.PackageHash), graph.CreateLiteralNode(hash));
            graph.Assert(subject, graph.CreateUriNode(Schema.Predicates.PackageSize), graph.CreateLiteralNode(size.ToString(), Schema.DataTypes.Integer));

            context.StageResults.Add(new GraphPackageMetadata(graph));

            return true;
        }

 public void TestCreateAssociationLinks()
 {
     var testGraph = new Graph {BaseUri = new Uri("http://dbpedia.org/resource/")};
     var film = testGraph.CreateUriNode(UriFactory.Create("http://dbpedia.org/resource/Un_Chien_Andalou"));
     var rdfType = testGraph.CreateUriNode(UriFactory.Create("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"));
     testGraph.Assert(film,
                      rdfType,
                      testGraph.CreateUriNode(UriFactory.Create("http://dbpedia.org/ontology/Film")));
     testGraph.Assert(film,
                      testGraph.CreateUriNode(UriFactory.Create("http://xmlns.com/foaf/0.1/name")),
                      testGraph.CreateLiteralNode("Un Chien Andalou"));
     var director = testGraph.CreateUriNode(UriFactory.Create("http://dbpedia.org/resource/Luis_Bunuel"));
     testGraph.Assert(director, rdfType, testGraph.CreateUriNode(UriFactory.Create("http://dbpedia.org/ontology/Person")));
     testGraph.Assert(film, testGraph.CreateUriNode(UriFactory.Create("http://dbpedia.org/property/director")), director);
     var mockRequest = new Mock<IODataRequestMessage>();
     mockRequest.Setup(m => m.Url).Returns(new Uri("http://example.org/odata/Films('Un_Chien_Andalou')"));
     var mock = new Mock<IODataResponseMessage>();
     var mockStream = new MemoryStream();
     mock.Setup(m => m.GetStream()).Returns(mockStream);
     var generator = new ODataFeedGenerator(mockRequest.Object, mock.Object, _dbpediaMap, "http://example.org/odata/", new ODataMessageWriterSettings { Indent = true });
     generator.CreateEntryFromGraph(testGraph, film.Uri.ToString(), "DBPedia.Film");
     mockStream.Seek(0, SeekOrigin.Begin);
     var streamXml = XDocument.Load(mockStream);
     Assert.IsNotNull(streamXml);
     Assert.IsNotNull(streamXml.Root);
     Assert.AreEqual(XName.Get("entry", "http://www.w3.org/2005/Atom"), streamXml.Root.Name);
     Console.WriteLine(streamXml.ToString());
 }

        public static void Main(string[] args)
        {
            //Create a new Empty Graph
            Graph g = new Graph();

            //Define Namespaces
            g.NamespaceMap.AddNamespace("pets", new Uri("http://example.org/pets"));
            
            //Create Uri Nodes
            IUriNode dog, fido, rob, owner, name, species, breed, lab;
            dog = g.CreateUriNode("pets:Dog");
            fido = g.CreateUriNode("pets:abc123");
            rob = g.CreateUriNode("pets:def456");
            owner = g.CreateUriNode("pets:hasOwner");
            name = g.CreateUriNode("pets:hasName");
            species = g.CreateUriNode("pets:isAnimal");
            breed = g.CreateUriNode("pets:isBreed");
            lab = g.CreateUriNode("pets:Labrador");

            //Assert Triples
            g.Assert(new Triple(fido, species, dog));
            g.Assert(new Triple(fido, owner, rob));
            g.Assert(new Triple(fido, name, g.CreateLiteralNode("Fido")));
            g.Assert(new Triple(rob, name, g.CreateLiteralNode("Rob")));
            g.Assert(new Triple(fido, breed, lab));

            //Attempt to output GraphViz
            try
            {
                Console.WriteLine("Writing GraphViz DOT file graph_building_example2.dot");
                GraphVizWriter gvzwriter = new GraphVizWriter();
                gvzwriter.Save(g, "graph_building_example2.dot");

                Console.WriteLine("Creating a PNG got this Graph called graph_building_example2.png");
                GraphVizGenerator gvzgen = new GraphVizGenerator("svg", "C:\\Program Files (x86)\\Graphviz2.20\\bin");
                gvzgen.Format = "png";
                gvzgen.Generate(g, "graph_building_example2.png", false);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.StackTrace);
            }
        }

        public override string CreateContent(CatalogContext context)
        {
            IGraph graph = new Graph();

            graph.NamespaceMap.AddNamespace("rdf", new Uri("http://www.w3.org/1999/02/22-rdf-syntax-ns#"));
            graph.NamespaceMap.AddNamespace("nuget", new Uri("http://nuget.org/schema#"));

            INode subject = graph.CreateUriNode(new Uri(GetBaseAddress() + GetItemIdentity()));

            graph.Assert(subject, graph.CreateUriNode("rdf:type"), graph.CreateUriNode("nuget:DeletePackage"));
            graph.Assert(subject, graph.CreateUriNode("nuget:id"), graph.CreateLiteralNode(_id));
            graph.Assert(subject, graph.CreateUriNode("nuget:version"), graph.CreateLiteralNode(_version));

            JObject frame = context.GetJsonLdContext("context.DeletePackage.json", GetItemType());

            string content = Utils.CreateJson(graph, frame);

            return content;
        }

        public void WritingRdfXmlLiteralsWithLanguageTags()
        {
            Graph g = new Graph();
            INode s = g.CreateUriNode(new Uri("http://example.org/subject"));
            INode p = g.CreateUriNode(new Uri("http://example.org/predicate"));
            INode o = g.CreateLiteralNode("string", "en");
            g.Assert(s, p, o);

            this.CheckRoundTrip(g);
        }

        public override IGraph CreatePageContent(CatalogContext context)
        {
            Uri resourceUri = new Uri(GetBaseAddress() + GetRelativeAddress());

            Graph graph = new Graph();

            INode subject = graph.CreateUriNode(resourceUri);
            INode count = graph.CreateUriNode(new Uri("http://nuget.org/schema#count"));
            INode itemGUID = graph.CreateUriNode(new Uri("http://nuget.org/schema#itemGUID"));
            INode minDownloadTimestamp = graph.CreateUriNode(new Uri("http://nuget.org/schema#minDownloadTimestamp"));
            INode maxDownloadTimestamp = graph.CreateUriNode(new Uri("http://nuget.org/schema#maxDownloadTimestamp"));

            graph.Assert(subject, count, graph.CreateLiteralNode(_data.Count.ToString(), Schema.DataTypes.Integer));
            graph.Assert(subject, itemGUID, graph.CreateLiteralNode(_itemGUID.ToString()));
            graph.Assert(subject, minDownloadTimestamp, graph.CreateLiteralNode(_minDownloadTimestamp.ToString("O"), Schema.DataTypes.DateTime));
            graph.Assert(subject, maxDownloadTimestamp, graph.CreateLiteralNode(_maxDownloadTimestamp.ToString("O"), Schema.DataTypes.DateTime));

            return graph;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="g"></param>
        public void insertComunidadeMoodle(ref Graph g)
        {
            g = new Graph();
            g.NamespaceMap.AddNamespace("onto", new Uri("http://www.owl-ontologies.com/OntoAdapt2.owl#"));

            IUriNode sujeito = g.CreateUriNode("onto:" + student.Matricula);
            INode rdfType = g.CreateUriNode("onto:ComunidadeMoodle");
            ILiteralNode literal = g.CreateLiteralNode(student.ComunidadeMoodle);

            Triple triple = new Triple(sujeito, rdfType, literal);
            g.Assert(triple);
        }