Examples with BNode org.eclipse.rdf4j.model.BNode used on opensource projects

Example 21 with BNode

use of org.eclipse.rdf4j.model.BNode in project rdf4j by eclipse.

the class SPARQLConnection method createInsertDataCommand.

private String createInsertDataCommand(Iterable<? extends Statement> statements, Resource... contexts) {
    StringBuilder qb = new StringBuilder();
    qb.append("INSERT DATA \n");
    qb.append("{ \n");
    if (contexts.length > 0) {
        for (Resource context : contexts) {
            if (context != null) {
                String namedGraph = context.stringValue();
                if (context instanceof BNode) {
                    // SPARQL does not allow blank nodes as named graph
                    // identifiers, so we need to skolemize
                    // the blank node id.
                    namedGraph = "urn:nodeid:" + context.stringValue();
                }
                qb.append("    GRAPH <" + namedGraph + "> { \n");
            }
            createDataBody(qb, statements, true);
            if (context != null) {
                qb.append(" } \n");
            }
        }
    } else {
        createDataBody(qb, statements, false);
    }
    qb.append("}");
    return qb.toString();
}

Example 22 with BNode

use of org.eclipse.rdf4j.model.BNode in project rdf4j by eclipse.

the class SPARQLConnection method createDeleteDataCommand.

private String createDeleteDataCommand(Iterable<? extends Statement> statements, Resource... contexts) {
    StringBuilder qb = new StringBuilder();
    qb.append("DELETE DATA \n");
    qb.append("{ \n");
    if (contexts.length > 0) {
        for (Resource context : contexts) {
            if (context != null) {
                String namedGraph = context.stringValue();
                if (context instanceof BNode) {
                    // SPARQL does not allow blank nodes as named graph
                    // identifiers, so we need to skolemize
                    // the blank node id.
                    namedGraph = "urn:nodeid:" + context.stringValue();
                }
                qb.append("    GRAPH <" + namedGraph + "> { \n");
            }
            createDataBody(qb, statements, true);
            if (context != null) {
                qb.append(" } \n");
            }
        }
    } else {
        createDataBody(qb, statements, false);
    }
    qb.append("}");
    return qb.toString();
}

Example 23 with BNode

use of org.eclipse.rdf4j.model.BNode in project rdf4j by eclipse.

the class RDFJSONWriter method writeObject.

/**
 * Helper method to reduce complexity of the JSON serialisation algorithm Any null contexts will only be
 * serialised to JSON if there are also non-null contexts in the contexts array
 *
 * @param object
 *        The RDF value to serialise
 * @param contexts
 *        The set of contexts that are relevant to this object, including null contexts as they are found.
 * @param jg
 *        the {@link JsonGenerator} to write to.
 * @throws IOException
 * @throws JsonGenerationException
 * @throws JSONException
 */
public static void writeObject(final Value object, final Set<Resource> contexts, final JsonGenerator jg) throws JsonGenerationException, IOException {
    jg.writeStartObject();
    if (object instanceof Literal) {
        jg.writeObjectField(RDFJSONUtility.VALUE, object.stringValue());
        jg.writeObjectField(RDFJSONUtility.TYPE, RDFJSONUtility.LITERAL);
        final Literal l = (Literal) object;
        if (Literals.isLanguageLiteral(l)) {
            jg.writeObjectField(RDFJSONUtility.LANG, l.getLanguage().orElse(null));
        } else {
            jg.writeObjectField(RDFJSONUtility.DATATYPE, l.getDatatype().stringValue());
        }
    } else if (object instanceof BNode) {
        jg.writeObjectField(RDFJSONUtility.VALUE, resourceToString((BNode) object));
        jg.writeObjectField(RDFJSONUtility.TYPE, RDFJSONUtility.BNODE);
    } else if (object instanceof IRI) {
        jg.writeObjectField(RDFJSONUtility.VALUE, resourceToString((IRI) object));
        jg.writeObjectField(RDFJSONUtility.TYPE, RDFJSONUtility.URI);
    }
    if (contexts != null && !contexts.isEmpty() && !(contexts.size() == 1 && contexts.iterator().next() == null)) {
        jg.writeArrayFieldStart(RDFJSONUtility.GRAPHS);
        for (final Resource nextContext : contexts) {
            if (nextContext == null) {
                jg.writeNull();
            } else {
                jg.writeString(resourceToString(nextContext));
            }
        }
        jg.writeEndArray();
    }
    jg.writeEndObject();
}

Example 24 with BNode

use of org.eclipse.rdf4j.model.BNode in project rdf4j by eclipse.

the class TriGParserCustomTest method testGraphLocalNameNotGraph.

@Test
public void testGraphLocalNameNotGraph() throws Exception {
    Model model = Rio.parse(new StringReader("@prefix ex: <urn:> .\n ex:a { [] <http://www.example.net/test> \"Foo\" }"), "", RDFFormat.TRIG);
    assertEquals(1, model.size());
    assertNotNull(model.contexts().iterator().next());
    assertEquals("urn:a", model.contexts().iterator().next().stringValue());
    assertTrue(model.subjects().iterator().next() instanceof BNode);
    assertEquals("http://www.example.net/test", model.predicates().iterator().next().stringValue());
    assertEquals("Foo", model.objects().iterator().next().stringValue());
}

Example 25 with BNode

use of org.eclipse.rdf4j.model.BNode in project rdf4j by eclipse.

the class TriGParserCustomTest method testSPARQLGraphKeyword.

@Test
public void testSPARQLGraphKeyword() throws Exception {
    Model model = Rio.parse(new StringReader("GRAPH <urn:a> { [] <http://www.example.net/test> \"Foo\" }"), "", RDFFormat.TRIG);
    assertEquals(1, model.size());
    assertNotNull(model.contexts().iterator().next());
    assertEquals("urn:a", model.contexts().iterator().next().stringValue());
    assertTrue(model.subjects().iterator().next() instanceof BNode);
    assertEquals("http://www.example.net/test", model.predicates().iterator().next().stringValue());
    assertEquals("Foo", model.objects().iterator().next().stringValue());
}