public void quad()

in commons-rdf-examples/src/example/UserGuideTest.java [161:198]
21 lines of code
2 McCabe index (conditional complexity)

    public void quad() throws Exception {
        BlankNodeOrIRI graph = factory.createIRI("http://example.com/graph");
        BlankNodeOrIRI subject = factory.createBlankNode();
        IRI predicate = factory.createIRI("http://example.com/says");
        RDFTerm object = factory.createLiteral("Hello");
        Quad quad = factory.createQuad(graph, subject, predicate, object);

        Optional<BlankNodeOrIRI> g = quad.getGraphName();
        if (g.isPresent()) {
            System.out.println(g.get().ntriplesString());
        }

        BlankNodeOrIRI subj = quad.getSubject();
        System.out.println(subj.ntriplesString());

        // null means default graph
        Quad otherQuad = factory.createQuad(null, subject, predicate, object);
        // Equal quads must have same g,s,p,o
        System.out.println(quad.equals(otherQuad));

        // all quads can be viewed as triples - "stripping" the graph
        Triple asTriple = quad.asTriple();
        Triple otherAsTriple = quad.asTriple();
        System.out.println(asTriple.equals(otherAsTriple));

        // NOTE: Quad does NOT extend Triple, however both Triple and Quad
        // extend TripleLike

        TripleLike a = quad;
        TripleLike b = quad.asTriple();
        // Unlike Triple and Quad, TripleLike does not mandate any .equals(),
        // it just provides common access to getSubject(), getPredicate(),
        // getObject()

        // TripleLike supports generalized RDF - therefore all s/p/o are of type
        // RDFTerm
        RDFTerm s = a.getSubject();
    }