Java Graph类代码示例

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void testJsonLdNullCache() throws UnsupportedEncodingException {
    final Map<String, String> properties = new HashMap<>();
    properties.put("icon", "//www.trellisldp.org/assets/img/trellis.png");
    properties.put("css", "//www.trellisldp.org/assets/css/trellis.css");

    final ByteArrayOutputStream out = new ByteArrayOutputStream();
    final IOService myservice = new JenaIOService(null, properties, emptySet(),
            singleton("http://www.w3.org/ns/"), null);
    myservice.write(getTriples(), out, JSONLD, rdf.createIRI("http://www.w3.org/ns/anno.jsonld"));
    final String output = out.toString("UTF-8");
    assertTrue(output.contains("\"http://purl.org/dc/terms/title\":[{\"@value\":\"A title\"}]"));
    assertFalse(output.contains("\"@context\":"));
    assertFalse(output.contains("\"@graph\":"));

    final Graph graph = rdf.createGraph();
    myservice.read(new ByteArrayInputStream(output.getBytes(UTF_8)), null, JSONLD).forEach(graph::add);
    validateGraph(graph);
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void testUpdate() {
    final Graph graph = rdf.createGraph();
    getTriples().forEach(graph::add);
    assertEquals(3L, graph.size());
    service.update(graph, "DELETE WHERE { ?s <http://purl.org/dc/terms/title> ?o }", "test:info");
    assertEquals(2L, graph.size());
    service.update(graph, "INSERT { " +
            "<> <http://purl.org/dc/terms/title> \"Other title\" } WHERE {}",
            "trellis:repository/resource");
    assertEquals(3L, graph.size());
    service.update(graph, "DELETE WHERE { ?s ?p ?o };" +
            "INSERT { <> <http://purl.org/dc/terms/title> \"Other title\" } WHERE {}",
            "trellis:repository");
    assertEquals(1L, graph.size());
    assertEquals("<trellis:repository>", graph.stream().findFirst().map(Triple::getSubject)
            .map(RDFTerm::ntriplesString).get());
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
private static Predicate<Graph> checkCardinality(final IRI model) {
    return graph -> {
        final Map<IRI, Long> cardinality = graph.stream()
            .filter(triple -> propertiesWithUriRange.contains(triple.getPredicate()))
            .collect(groupingBy(Triple::getPredicate, counting()));

        if (LDP.IndirectContainer.equals(model)) {
            if (isNull(cardinality.get(LDP.insertedContentRelation)) || !hasMembershipProps(cardinality)) {
                return true;
            }
        } else if (LDP.DirectContainer.equals(model) && !hasMembershipProps(cardinality)) {
            return true;
        }

        return cardinality.entrySet().stream().map(Map.Entry::getValue).anyMatch(val -> val > 1);
    };
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
/**
 * Create an Authorization object from an RDF graph.
 *
 * @param identifier the subject IRI
 * @param graph the RDF graph
 */
public Authorization(final BlankNodeOrIRI identifier, final Graph graph) {
    requireNonNull(identifier, "The Authorization identifier may not be null!");
    requireNonNull(graph, "The input graph may not be null!");

    this.identifier = identifier;

    this.dataMap.put(ACL.agent, new HashSet<>());
    this.dataMap.put(ACL.agentClass, new HashSet<>());
    this.dataMap.put(ACL.agentGroup, new HashSet<>());
    this.dataMap.put(ACL.mode, new HashSet<>());
    this.dataMap.put(ACL.accessTo, new HashSet<>());
    this.dataMap.put(ACL.default_, new HashSet<>());

    graph.stream(identifier, null, null).filter(triple -> dataMap.containsKey(triple.getPredicate()))
        .filter(triple -> triple.getObject() instanceof IRI)
        .forEachOrdered(triple -> dataMap.get(triple.getPredicate()).add((IRI) triple.getObject()));
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
private Stream<Authorization> getAllAuthorizationsFor(final Resource resource, final Boolean top) {
    LOGGER.debug("Checking ACL for: {}", resource.getIdentifier());
    final Optional<IRI> parent = resourceService.getContainer(resource.getIdentifier());
    if (resource.hasAcl()) {
        try (final Graph graph = resource.stream(Trellis.PreferAccessControl).collect(toGraph())) {
            final List<Authorization> authorizations = getAuthorizationFromGraph(graph);

            if (!top && authorizations.stream().anyMatch(getInheritedAuth(resource.getIdentifier()))) {
                return authorizations.stream().filter(getInheritedAuth(resource.getIdentifier()));
            }
            return authorizations.stream().filter(getAccessToAuth(resource.getIdentifier()));
        } catch (final Exception ex) {
            throw new RuntimeTrellisException(ex);
        }
    }
    // Nothing here, check the parent
    LOGGER.debug("No ACL for {}; looking up parent resource", resource.getIdentifier());
    return parent.flatMap(resourceService::get).map(res -> getAllAuthorizationsFor(res, false))
        .orElseGet(Stream::empty);
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void testEntity() {
    final Triple triple = rdf.createTriple(identifier, RDFS.label, rdf.createLiteral("A label"));

    when(mockResource.stream(eq(Trellis.PreferUserManaged))).thenAnswer(x -> of(triple));
    when(mockLdpRequest.getPath()).thenReturn("resource");

    final PatchHandler patchHandler = new PatchHandler(mockLdpRequest, insert,
            mockResourceService, mockIoService, null);

    final Response res = patchHandler.updateResource(mockResource).build();
    assertEquals(NO_CONTENT, res.getStatusInfo());

    verify(mockIoService).update(any(Graph.class), eq(insert), eq(identifier.getIRIString()));

    verify(mockResourceService).put(eq(identifier), eq(LDP.RDFSource), any(Dataset.class));
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void testJsonLdNullCache() throws UnsupportedEncodingException {
    final Map<String, String> properties = new HashMap<>();
    properties.put("icon",
            "//s3.amazonaws.com/www.trellisldp.org/assets/img/trellis.png");
    properties.put("css",
            "//s3.amazonaws.com/www.trellisldp.org/assets/css/trellis.css");

    final ByteArrayOutputStream out = new ByteArrayOutputStream();
    final IOService myservice = new JenaIOService(null, properties, emptySet(),
            singleton("http://www.w3.org/ns/"), null);
    myservice.write(getTriples(), out, JSONLD, rdf.createIRI("http://www.w3.org/ns/anno.jsonld"));
    final String output = out.toString("UTF-8");
    assertTrue(output.contains("\"http://purl.org/dc/terms/title\":[{\"@value\":\"A title\"}]"));
    assertFalse(output.contains("\"@context\":"));
    assertFalse(output.contains("\"@graph\":"));

    final Graph graph = rdf.createGraph();
    myservice.read(new ByteArrayInputStream(output.getBytes(UTF_8)), null, JSONLD).forEach(graph::add);
    validateGraph(graph);
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
/**
 * Create an Authorization object from an RDF graph
 * @param identifier the subject IRI
 * @param graph the RDF graph
 */
public Authorization(final BlankNodeOrIRI identifier, final Graph graph) {
    requireNonNull(identifier, "The Authorization identifier may not be null!");
    requireNonNull(graph, "The input graph may not be null!");

    this.identifier = identifier;

    this.dataMap.put(ACL.agent, new HashSet<>());
    this.dataMap.put(ACL.agentClass, new HashSet<>());
    this.dataMap.put(ACL.agentGroup, new HashSet<>());
    this.dataMap.put(ACL.mode, new HashSet<>());
    this.dataMap.put(ACL.accessTo, new HashSet<>());
    this.dataMap.put(ACL.default_, new HashSet<>());

    graph.stream(identifier, null, null).filter(triple -> dataMap.containsKey(triple.getPredicate()))
        .filter(triple -> triple.getObject() instanceof IRI)
        .forEachOrdered(triple -> dataMap.get(triple.getPredicate()).add((IRI) triple.getObject()));
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
private Stream<Authorization> getAllAuthorizationsFor(final Resource resource, final Boolean top) {
    LOGGER.debug("Checking ACL for: {}", resource.getIdentifier());
    final Optional<IRI> parent = resourceService.getContainer(resource.getIdentifier());
    if (resource.hasAcl()) {
        try (final Graph graph = resource.stream(Trellis.PreferAccessControl).collect(toGraph())) {
            final List<Authorization> authorizations = getAuthorizationFromGraph(graph);

            if (!top && authorizations.stream().anyMatch(getInheritedAuth(resource.getIdentifier()))) {
                return authorizations.stream().filter(getInheritedAuth(resource.getIdentifier()));
            }
            return authorizations.stream().filter(getAccessToAuth(resource.getIdentifier()));
        } catch (final Exception ex) {
            throw new RuntimeRepositoryException(ex);
        }
    }
    // Nothing here, check the parent
    LOGGER.debug("No ACL for {}; looking up parent resource", resource.getIdentifier());
    return parent.flatMap(resourceService::get).map(res -> getAllAuthorizationsFor(res, false))
        .orElseGet(Stream::empty);
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
private void checkGraph(final Graph g) throws Exception {
    assertTrue(g.size() > 0);
    final IRI greeting = factory.createIRI("http://example.com/greeting");
    // Should only have parsed once!
    assertEquals(1, g.stream(null, greeting, null).count());
    final Triple triple = g.stream(null, greeting, null).findAny().get();
    assertTrue(triple.getSubject() instanceof IRI);
    final IRI parsing = (IRI) triple.getSubject();
    assertTrue(parsing.getIRIString().startsWith("urn:uuid:"));

    assertEquals("http://example.com/greeting", triple.getPredicate().getIRIString());

    assertTrue(triple.getObject() instanceof Literal);
    final Literal literal = (Literal) triple.getObject();
    assertEquals("Hello world", literal.getLexicalForm());
    assertFalse(literal.getLanguageTag().isPresent());
    assertEquals(Types.XSD_STRING, literal.getDatatype());

    // Check uniqueness of properties that are always present
    assertEquals(1, g.stream(null, factory.createIRI("http://example.com/source"), null).count());

    // Check optional properties that are unique
    assertTrue(2 > g.stream(null, factory.createIRI("http://example.com/base"), null).count());
    assertTrue(2 > g.stream(null, factory.createIRI("http://example.com/contentType"), null).count());
    assertTrue(2 > g.stream(null, factory.createIRI("http://example.com/contentTypeSyntax"), null).count());
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void parseFile() throws Exception {
    try (final Graph g = factory.createGraph()) {
        final RDFParser parser = dummyParser.source(testNt).target(g);
        parser.parse().get(5, TimeUnit.SECONDS);
        checkGraph(g);
        // FIXME: this could potentially break if the equivalent of /tmp
        // includes
        // international characters
        assertEquals("<" + testNt.toUri().toString() + ">", firstPredicate(g, "source"));
        // Should be set to the file path - after following symlinks
        assertEquals("<" + testNt.toRealPath().toUri().toString() + ">", firstPredicate(g, "base"));

        // Should NOT have guessed the content type
        assertNull(firstPredicate(g, "contentType"));
        assertNull(firstPredicate(g, "contentTypeSyntax"));
    }
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void parseFileContentType() throws Exception {
    try (final Graph g = factory.createGraph()) {
        final RDFParser parser = dummyParser.source(testNt).contentType(RDFSyntax.NTRIPLES).target(g);
        parser.parse().get(5, TimeUnit.SECONDS);
        checkGraph(g);
        // FIXME: this could potentially break if the equivalent of /tmp
        // includes
        // international characters
        assertEquals("<" + testNt.toUri().toString() + ">", firstPredicate(g, "source"));
        // Should be set to the file path - after following symlinks
        assertEquals("<" + testNt.toRealPath().toUri().toString() + ">", firstPredicate(g, "base"));
        assertEquals("\"" + RDFSyntax.NTRIPLES.name() + "\"", firstPredicate(g, "contentTypeSyntax"));
        assertEquals("\"application/n-triples\"", firstPredicate(g, "contentType"));
    }
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void parseInputStreamWithBase() throws Exception {
    final InputStream inputStream = new ByteArrayInputStream(new byte[0]);
    final IRI base = dummyParser.createRDFTermFactory().createIRI("http://www.example.org/test.rdf");
    try (final Graph g = factory.createGraph()) {
        final RDFParser parser = dummyParser.source(inputStream).base(base).target(g);
        parser.parse().get(5, TimeUnit.SECONDS);
        checkGraph(g);
        assertEquals("<http://www.example.org/test.rdf>", firstPredicate(g, "base"));
        // in our particular debug output,
        // bnode source indicates InputStream
        assertTrue(firstPredicate(g, "source").startsWith("_:"));
        assertNull(firstPredicate(g, "contentType"));
        assertNull(firstPredicate(g, "contentTypeSyntax"));
    }
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
@Test
public void parseIRI() throws Exception {
    final IRI iri = dummyParser.createRDFTermFactory().createIRI("http://www.example.net/test.ttl");
    try (final Graph g = factory.createGraph()) {
        final RDFParser parser = dummyParser.source(iri).target(g);
        parser.parse().get(5, TimeUnit.SECONDS);
        checkGraph(g);
        assertEquals("<http://www.example.net/test.ttl>", firstPredicate(g, "source"));
        // No base - assuming the above IRI is always
        // the base would break server-supplied base from
        // any HTTP Location redirects and Content-Location header
        assertNull(firstPredicate(g, "base"));
        // ".ttl" in IRI string does not imply any content type
        assertNull(firstPredicate(g, "contentType"));
        assertNull(firstPredicate(g, "contentTypeSyntax"));
    }
}
 

import org.apache.commons.rdf.api.Graph; //导入依赖的package包/类
private void checkGraph(final Graph g) {
    assertTrue(g.contains(test, type, Type));
    // Should not include statements from the named graph

    assertEquals(1, g.stream(test, pred1, null).count());
    assertEquals(1, g.stream(test, pred2, null).count());

    assertEquals("Hello", ((Literal) g.stream(test, pred1, null).findFirst().get().getObject()).getLexicalForm());
    assertTrue(g.contains(test, pred2, other));

    assertEquals("1337", ((Literal) g.stream(test, pred3, null).findFirst().get().getObject()).getLexicalForm());
    assertEquals(Types.XSD_INTEGER,
            ((Literal) g.stream(test, pred3, null).findFirst().get().getObject()).getDatatype());

    // While the named graph 'graph' is not included, the relationship
    // to that @id is included.
    assertTrue(g.contains(test, pred4, graph));
}