Examples of org.jrdf.graph.GraphElementFactory

org.jrdf.graph.GraphElementFactory
A Graph Element Factory is a class which creates the various components of a graph including: resources, literals and blank nodes. It is generally tied to a specific graph (in the case of blank nodes it must be). @author Andrew Newman @version $Revision: 2894 $

        init();
    }


    private void init() {
        try {
            GraphElementFactory elementFactory = graph.getElementFactory();
            PredicateNode type = elementFactory.createURIReference(RDF.TYPE);
            ObjectNode graphName = elementFactory.createURIReference(GRAPH);
            for (Triple triple : graph.find(ANY_SUBJECT_NODE, type, graphName)) {
                addResource(elementFactory, triple);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);

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    public boolean hasGraph(String name) {
        return graphNameToId.keySet().contains(name);
    }


    public long addGraph(String name) {
        GraphElementFactory graphElementFactory = graph.getElementFactory();
        highestId++;
        Resource resource = tryAddGraph(name, highestId, graphElementFactory);
        graphs.add(resource);
        return highestId;
    }

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    private static void createNewTriples() throws GraphException {
        System.out.println("Creating new graphs");
        Graph fooGraph = JRDF_FACTORY.getNewGraph("foo");
        Graph barGraph = JRDF_FACTORY.getNewGraph("bar");
        GraphElementFactory barElementFactory = barGraph.getElementFactory();
        URI uri1 = URI.create("urn:hello");
        URI uri2 = URI.create("urn:there");
        Resource resource = barElementFactory.createResource(uri1);
        resource.addValue(uri1, uri2);
        resource.addValue(uri2, uri2);
        GraphElementFactory fooElementFactory = fooGraph.getElementFactory();
        Resource blankResource = fooElementFactory.createResource();
        blankResource.addValue(uri1, uri2);
        blankResource.addValue(uri1, uri1);
        blankResource.addValue(uri2, uri2);
    }

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        performQuery(graph);
        System.out.println("Example finished.");
    }


    private void populateGraph(Graph graph) throws GraphException {
        GraphElementFactory elementFactory = graph.getElementFactory();
        person = elementFactory.createResource(PERSON);
        address = elementFactory.createResource();
        addressStatement = person.asTriple(HAS_ADDRESS, address);
        graph.add(addressStatement);
        address.addValue(HAS_STREET, "1501 Grant Avenue");
        cityStatement = address.asTriple(HAS_CITY, "Bedford");
        graph.add(cityStatement);

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     */
    private void performReification(Graph graph) throws Exception {
        System.out.println("Reifying a statement...");


        //get the Factories
        GraphElementFactory elementFactory = graph.getElementFactory();
        TripleFactory tripleFactory = graph.getTripleFactory();


        //create a resource to identify the statement
        URIReference statement = elementFactory.createURIReference(new URI("http://example.org/statement#address"));


        //reify the address statement (person, hasAddress, address)
        tripleFactory.reifyTriple(addressStatement, statement);


        //insert a statement about the original statement
        URIReference manager = elementFactory.createURIReference(new URI("http://example.org/managerid#65"));
        URIReference hasConfirmed = elementFactory.createURIReference(new URI("http://example.org/terms#hasConfirmed"));
        Triple confirmationStatement = tripleFactory.createTriple(manager, hasConfirmed, statement);
        graph.add(confirmationStatement);


        //print the contents
        print("Graph contains (after reification): ", graph);

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            throws GraphElementFactoryException {
        if (n instanceof URIReference) {
            return getLocalizedResource(n);
        } else if (n instanceof Literal) {
            Literal l = (Literal) n;
            GraphElementFactory elementFactory = _connector.getElementFactory();
            if (l.getDatatypeURI() != null) {
                return elementFactory.createLiteral(l.getLexicalForm(),
                                                    l.getDatatypeURI());
            } else if (l.getLanguage() != null) {
                return elementFactory.createLiteral(l.getLexicalForm(),
                                                    l.getLanguage());
            } else {
                return elementFactory.createLiteral(l.getLexicalForm());
            }
        } else {
            throw new RuntimeException("Error localizing triple; "
                    + n.getClass().getName() + " is not a URIReference "
                    + "or a Literal");

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