Example usage for org.apache.commons.rdf.api Triple getObject

Introduction

In this page you can find the example usage for org.apache.commons.rdf.api Triple getObject.

Prototype

RDFTerm getObject();

Source Link

Document

The object of this triple, which may be either a BlankNode , an IRI , or a Literal , which are represented in Commons RDF by the interface RDFTerm .

Usage

From source file:example.IntroToRDF.java

public static void main(String[] args) {
    RDF rdf = new SimpleRDF();

    IRI alice = rdf.createIRI("Alice");
    System.out.println(alice.ntriplesString());

    IRI knows = rdf.createIRI("knows");
    IRI bob = rdf.createIRI("Bob");

    Triple aliceKnowsBob = rdf.createTriple(alice, knows, bob);
    System.out.println(aliceKnowsBob.getSubject().ntriplesString());

    System.out.println(aliceKnowsBob);

    Graph graph = rdf.createGraph();/*w ww .  j av a2  s. com*/
    graph.add(aliceKnowsBob);

    IRI charlie = rdf.createIRI("Charlie");

    IRI plays = rdf.createIRI("plays");

    IRI football = rdf.createIRI("Football");
    IRI tennis = rdf.createIRI("Tennis");

    graph.add(alice, knows, charlie);
    graph.add(alice, plays, tennis);
    graph.add(bob, knows, charlie);
    graph.add(bob, plays, football);
    graph.add(charlie, plays, tennis);

    System.out.println("Who plays Tennis?");
    for (Triple triple : graph.iterate(null, plays, tennis)) {
        System.out.println(triple.getSubject());
        System.out.println(plays.equals(triple.getPredicate()));
        System.out.println(tennis.equals(triple.getObject()));
    }

    System.out.println("Who does Alice know?");
    for (Triple triple : graph.iterate(alice, knows, null)) {
        System.out.println(triple.getObject());
    }

    System.out.println("Does Alice anyone that plays Football?");
    for (Triple triple : graph.iterate(alice, knows, null)) {
        RDFTerm aliceFriend = triple.getObject();
        if (!(aliceFriend instanceof BlankNodeOrIRI)) {
            continue;
        }
        if (graph.contains((BlankNodeOrIRI) aliceFriend, plays, football)) {
            System.out.println("Yes, it is " + aliceFriend);
        }
    }

    Literal aliceName = rdf.createLiteral("Alice W. Land");
    IRI name = rdf.createIRI("name");
    graph.add(alice, name, aliceName);

    Optional<? extends Triple> nameTriple = graph.stream(alice, name, null).findAny();
    if (nameTriple.isPresent()) {
        System.out.println(nameTriple.get());
    }

    graph.stream(alice, name, null).findAny().map(Triple::getObject).filter(obj -> obj instanceof Literal)
            .map(literalName -> ((Literal) literalName).getLexicalForm()).ifPresent(System.out::println);

    IRI playerRating = rdf.createIRI("playerRating");
    Literal aliceRating = rdf.createLiteral("13.37", Types.XSD_FLOAT);
    graph.add(alice, playerRating, aliceRating);

    Literal footballInEnglish = rdf.createLiteral("football", "en");
    Literal footballInNorwegian = rdf.createLiteral("fotball", "no");
    graph.add(football, name, footballInEnglish);
    graph.add(football, name, footballInNorwegian);

    Literal footballInAmericanEnglish = rdf.createLiteral("soccer", "en-US");
    graph.add(football, name, footballInAmericanEnglish);

    BlankNode someone = rdf.createBlankNode();
    graph.add(charlie, knows, someone);
    graph.add(someone, plays, football);

    BlankNode someoneElse = rdf.createBlankNode();
    graph.add(charlie, knows, someoneElse);

    for (Triple heKnows : graph.iterate(charlie, knows, null)) {
        if (!(heKnows.getObject() instanceof BlankNodeOrIRI)) {
            continue;
        }
        BlankNodeOrIRI who = (BlankNodeOrIRI) heKnows.getObject();
        System.out.println("Charlie knows " + who);
        for (Triple whoPlays : graph.iterate(who, plays, null)) {
            System.out.println("  who plays " + whoPlays.getObject());
        }
    }

    // Delete previous BlankNode statements
    graph.remove(null, null, someone);
    graph.remove(someone, null, null);

    // no Java variable for the new BlankNode instance
    graph.add(charlie, knows, rdf.createBlankNode("someone"));
    // at any point later (with the same RDF instance)
    graph.add(rdf.createBlankNode("someone"), plays, football);

    for (Triple heKnows : graph.iterate(charlie, knows, null)) {
        if (!(heKnows.getObject() instanceof BlankNodeOrIRI)) {
            continue;
        }
        BlankNodeOrIRI who = (BlankNodeOrIRI) heKnows.getObject();
        System.out.println("Charlie knows " + who);
        for (Triple whoPlays : graph.iterate(who, plays, null)) {
            System.out.println("  who plays " + whoPlays.getObject());
        }
    }

}

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From source file:example.UserGuideTest.java

public static String tripleAsString(Triple t) {
    return t.getSubject().ntriplesString() + " " + t.getPredicate().ntriplesString() + " "
            + t.getObject().ntriplesString() + " .";
}

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From source file:example.UserGuideTest.java

@Test
public void graph() throws Exception {
    IRI nameIri = factory.createIRI("http://example.com/name");
    BlankNode aliceBlankNode = factory.createBlankNode();
    Literal aliceLiteral = factory.createLiteral("Alice");
    Triple triple = factory.createTriple(aliceBlankNode, nameIri, aliceLiteral);

    Graph graph = factory.createGraph();

    graph.add(triple);//from w  w  w  . j a va2s .c  o m

    IRI bob = factory.createIRI("http://example.com/bob");
    Literal bobName = factory.createLiteral("Bob");
    graph.add(bob, nameIri, bobName);

    System.out.println(graph.contains(triple));

    System.out.println(graph.contains(null, nameIri, bobName));

    System.out.println(graph.size());

    for (Triple t : graph.iterate()) {
        System.out.println(t.getObject());
    }

    for (Triple t : graph.iterate(null, null, bobName)) {
        System.out.println(t.getPredicate());
    }

    Stream<RDFTerm> subjects = graph.getTriples().map(t -> t.getObject());
    String s = subjects.map(RDFTerm::ntriplesString).collect(Collectors.joining(" "));
    System.out.println(s);

    Stream<? extends Triple> namedB = graph.getTriples(null, nameIri, null)
            .filter(t -> t.getObject().ntriplesString().contains("B"));
    System.out.println(namedB.map(t -> t.getSubject()).findAny().get());

    graph.remove(triple);
    System.out.println(graph.contains(triple));

    graph.remove(null, nameIri, null);

    graph.clear();
    System.out.println(graph.contains(null, null, null));

}

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From source file:example.UserGuideTest.java

@Test
public void triple() throws Exception {
    BlankNodeOrIRI subject = factory.createBlankNode();
    IRI predicate = factory.createIRI("http://example.com/says");
    RDFTerm object = factory.createLiteral("Hello");
    Triple triple = factory.createTriple(subject, predicate, object);

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

    IRI pred = triple.getPredicate();/*from w w  w  .  ja v a 2s.  c  o m*/
    System.out.println(pred.getIRIString());

    RDFTerm obj = triple.getObject();
    System.out.println(obj.ntriplesString());

    if (subj instanceof IRI) {
        String s = ((IRI) subj).getIRIString();
        System.out.println(s);
    }
    // ..
    if (obj instanceof Literal) {
        IRI type = ((Literal) obj).getDatatype();
        System.out.println(type);
    }

    System.out.println(triple.equals(factory.createTriple(subj, pred, obj)));
}

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From source file:org.apache.jena.commonsrdf.impl.JCR_Triple.java

JCR_Triple(org.apache.jena.graph.Triple triple) {
    this.subject = (BlankNodeOrIRI) JCR_Factory.fromJena(triple.getSubject());
    this.predicate = (IRI) JCR_Factory.fromJena(triple.getPredicate());
    this.object = JCR_Factory.fromJena(triple.getObject());
    this.triple = triple;
}

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From source file:org.apache.jena.commonsrdf.impl.JCR_Triple.java

@Override
public boolean equals(Object other) {
    if (other == this)
        return true;
    if (other == null)
        return false;
    if (!(other instanceof Triple))
        return false;
    Triple triple = (Triple) other;
    return getSubject().equals(triple.getSubject()) && getPredicate().equals(triple.getPredicate())
            && getObject().equals(triple.getObject());
}

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From source file:org.apache.jena.commonsrdf.JenaCommonsRDF.java

/** Convert a CommonsRDF Triple to a Jena Triple.
 * If the Triple was from Jena originally, return that original object else
 * create a copy using Jena objects. /*from w ww.  j  a  v  a2 s .c  o  m*/
 */
public static org.apache.jena.graph.Triple toJena(Triple triple) {
    if (triple instanceof JenaTriple)
        return ((JenaTriple) triple).getTriple();
    return new org.apache.jena.graph.Triple(toJena(triple.getSubject()), toJena(triple.getPredicate()),
            toJena(triple.getObject()));
}

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From source file:org.apache.jena.commonsrdf.JenaCommonsRDF.java

/** Convert from Jena {@link org.apache.jena.graph.Triple} to any RDFCommons implementation */
public static Triple fromJena(RDFTermFactory factory, org.apache.jena.graph.Triple triple) {
    BlankNodeOrIRI subject = (BlankNodeOrIRI) (fromJena(factory, triple.getSubject()));
    IRI predicate = (IRI) (fromJena(factory, triple.getPredicate()));
    RDFTerm object = fromJena(factory, triple.getObject());
    return factory.createTriple(subject, predicate, object);
}

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From source file:org.semanticweb.owlapi.io.RDFTriple.java

@Override
public boolean equals(@Nullable Object obj) {
    if (obj == this) {
        return true;
    }/* w ww .  j  av  a 2 s . c  om*/
    if (obj instanceof RDFTriple) {
        RDFTriple other = (RDFTriple) obj;
        return subject.equals(other.subject) && predicate.equals(other.predicate)
                && object.equals(other.object);
    }
    // Commons RDF Triple.equals() contract
    if (obj instanceof Triple) {
        // Note: This also works on RDFLiteral
        // but is slightly more expensive as it must call the
        // getter methods when accessing obj.
        //
        // To ensure future compatibility, the Commons RDF getter
        // methods are also called on this rather than using the fields.
        Triple triple = (Triple) obj;
        return getSubject().equals(triple.getSubject()) && getPredicate().equals(triple.getPredicate())
                && getObject().equals(triple.getObject());
    }
    return false;
}

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From source file:org.trellisldp.rdfa.HtmlData.java

private LabelledTriple labelTriple(final Triple triple) {
    final String pred = triple.getPredicate().getIRIString();
    if (triple.getObject() instanceof IRI) {
        return new LabelledTriple(triple, getLabel(pred), getLabel(((IRI) triple.getObject()).getIRIString()));
    } else if (triple.getObject() instanceof Literal) {
        return new LabelledTriple(triple, getLabel(pred), ((Literal) triple.getObject()).getLexicalForm());
    }//from  ww w. ja va  2s . c  o m
    return new LabelledTriple(triple, getLabel(pred), triple.getObject().ntriplesString());
}

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