org.eclipse.rdf4j.model.Statement#getSubject

Source File: RepositoryConnectionTest.java From rdf4j with BSD 3-Clause "New" or "Revised" License

6 votes

@Test
public void testBNodeSerialization() throws Exception {
	testCon.add(bob, name, nameBob);

	Statement st;
	try (RepositoryResult<Statement> statements = testCon.getStatements(null, null, null, false);) {
		st = statements.next();
	}

	BNode bnode = (BNode) st.getSubject();

	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	ObjectOutputStream out = new ObjectOutputStream(baos);
	out.writeObject(bnode);
	out.close();

	ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
	ObjectInputStream in = new ObjectInputStream(bais);
	BNode deserializedBNode = (BNode) in.readObject();
	in.close();

	assertThat(deserializedBNode).isEqualTo(bnode);

	assertThat(testCon.hasStatement(bnode, name, nameBob, true)).isTrue();
	assertThat(testCon.hasStatement(deserializedBNode, name, nameBob, true)).isTrue();
}

Source File: ExploreServlet.java From rdf4j with BSD 3-Clause "New" or "Revised" License

6 votes

/**
 * Gets whether this is the first time the result quad has been seen.
 *
 * @param patternPredicate the predicate asked for, or null if another quad element was asked for
 * @param patternObject    the object asked for, or null if another quad element was asked for
 * @param result           the result statement to determine if we've already seen
 * @param patternContext   the context asked for, or null if another quad element was asked for
 * @return true, if this is the first time the quad has been seen, false otherwise
 */
private boolean isFirstTimeSeen(Statement result, IRI patternPredicate, Value patternObject,
		Resource... patternContext) {
	Resource resultSubject = result.getSubject();
	IRI resultPredicate = result.getPredicate();
	Value resultObject = result.getObject();
	boolean firstTimeSeen;
	if (1 == patternContext.length) {
		// I.e., when context matches explore value.
		Resource ctx = patternContext[0];
		firstTimeSeen = !(ctx.equals(resultSubject) || ctx.equals(resultPredicate) || ctx.equals(resultObject));
	} else if (null != patternObject) {
		// I.e., when object matches explore value.
		firstTimeSeen = !(resultObject.equals(resultSubject) || resultObject.equals(resultPredicate));
	} else if (null != patternPredicate) {
		// I.e., when predicate matches explore value.
		firstTimeSeen = !(resultPredicate.equals(resultSubject));
	} else {
		// I.e., when subject matches explore value.
		firstTimeSeen = true;
	}
	return firstTimeSeen;
}

Source File: ConformanceTest.java From rya with Apache License 2.0

6 votes

/**
 * Determine that a statement is trivially true for purposes of entailment
 * tests, such as an implicit "[bnode] type Ontology" triple or a
 * "[class] type Class" triple as long as the class exists.
 */
boolean triviallyTrue(final Statement triple, final Schema schema) {
    final Resource s = triple.getSubject();
    final IRI p = triple.getPredicate();
    final Value o = triple.getObject();
    if (p.equals(RDF.TYPE)) {
        if (o.equals(OWL.ONTOLOGY)) {
            return true;
        }
        else if (o.equals(OWL.CLASS)) {
            return schema.hasClass(s);
        }
        else if ((o.equals(OWL.OBJECTPROPERTY)
            || o.equals(OWL.DATATYPEPROPERTY))
            && s instanceof IRI) {
            // Distinction not maintained, irrelevant to RL rules
            return schema.hasProperty((IRI) s);
        }
    }
    return false;
}

Source File: InferenceEngine.java From rya with Apache License 2.0

5 votes

private static void addStatementEdge(final Graph graph, final String edgeName, final Statement st) {
    final Resource subj = st.getSubject();
    Vertex a = getVertex(graph, subj);
    if (a == null) {
        a = graph.addVertex(T.id, subj.toString());
        a.property(URI_PROP, subj);
    }
    final Value obj = st.getObject();
    Vertex b = getVertex(graph, obj);
    if (b == null) {
        b = graph.addVertex(T.id, obj.toString());
        b.property(URI_PROP, obj);
    }
    a.addEdge(edgeName, b);
}

Source File: CombineContextsRdfInserter.java From rya with Apache License 2.0

5 votes

@Override
public void handleStatement(Statement st)
        throws RDFHandlerException {
    Resource subj = st.getSubject();
    IRI pred = st.getPredicate();
    Value obj = st.getObject();
    Resource ctxt = st.getContext();

    if (!preserveBNodeIDs) {
        if (subj instanceof BNode) {
            subj = mapBNode((BNode) subj);
        }

        if (obj instanceof BNode) {
            obj = mapBNode((BNode) obj);
        }

        if (!enforcesContext() && ctxt instanceof BNode) {
            ctxt = mapBNode((BNode) ctxt);
        }
    }

    try {
        if (enforcesContext()) {
            Resource[] ctxts = contexts;
            if (ctxt != null) {
                ctxts = combineContexts(contexts, ctxt);
            }
            con.add(subj, pred, obj, ctxts);
        } else {
            con.add(subj, pred, obj, ctxt);
        }
    } catch (RepositoryException e) {
        throw new RDFHandlerException(e);
    }
}