org.apache.commons.rdf.api.Dataset.getGraph()方法的使用及代码示例

x33g5p2x  于2022-01-18 转载在 其他  
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本文整理了Java中org.apache.commons.rdf.api.Dataset.getGraph()方法的一些代码示例，展示了Dataset.getGraph()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Dataset.getGraph()方法的具体详情如下：
包路径：org.apache.commons.rdf.api.Dataset
类名称：Dataset
方法名：getGraph

Dataset.getGraph介绍

[英]Get the default graph of this dataset.

The Triples of the default graph are equivalent to the Quads in this Dataset which has the Quad#getGraphName()set to Optional#empty().

It is unspecified if modifications to the returned Graph are reflected in this Dataset.

The returned graph MAY be empty.
[中]获取此数据集的默认图形。
默认图形的三元组等效于此数据集中的四元组，其中四元组#getGraphName（）设置为可选的#empty（）。
如果对返回图形的修改反映在此数据集中，则未指定。
返回的图形可能为空。

代码示例

代码示例来源：origin: trellis-ldp/trellis

/**
 * Get a graph from the dataset.
 *
 * @param graphName the graph name
 * @return the graph
 */
public Optional<Graph> getGraph(final IRI graphName) {
  return dataset.getGraph(graphName);
}

代码示例来源：origin: org.trellisldp.ext/trellis-db

private static void updateAcl(final Handle handle, final int resourceId, final Dataset dataset,
    final int batchSize) {
  dataset.getGraph(PreferAccessControl).ifPresent(graph ->
      batchUpdateTriples(handle, resourceId, "acl", graph, batchSize));
}

代码示例来源：origin: org.trellisldp/trellis-rosid-common

@Override
public Collection<IRI> getTypes() {
  return data.getGraph(Trellis.PreferAudit)
    .map(graph -> graph.stream(null, type, null).map(Triple::getObject)
        .filter(term -> term instanceof IRI).map(term -> (IRI) term).collect(toList()))
    .orElseGet(Collections::emptyList);
}

代码示例来源：origin: org.trellisldp/trellis-rosid-common

@Override
public Collection<IRI> getAgents() {
  return data.getGraph(Trellis.PreferAudit)
    .map(graph -> graph.stream(null, PROV.wasAssociatedWith, null).map(Triple::getObject)
        .filter(term -> term instanceof IRI).map(term -> (IRI) term).collect(toList()))
    .orElseGet(Collections::emptyList);
}

代码示例来源：origin: org.trellisldp.ext/trellis-db

private static void updateDescription(final Handle handle, final int resourceId, final Dataset dataset,
    final int batchSize) {
  dataset.getGraph(PreferUserManaged).ifPresent(graph ->
      batchUpdateTriples(handle, resourceId, "description", graph, batchSize));
}

代码示例来源：origin: org.trellisldp/trellis-rosid-common

@Override
  public Optional<IRI> getInbox() {
    return data.getGraph(Trellis.PreferUserManaged)
      .flatMap(graph -> graph.stream(null, LDP.inbox, null).map(Triple::getObject)
          .filter(term -> term instanceof IRI).map(term -> (IRI) term).findFirst());
  }
}

代码示例来源：origin: trellis-ldp/trellis

protected Metadata.Builder metadataBuilder(final IRI identifier, final IRI ixnModel, final TrellisDataset mutable) {
  final Metadata.Builder builder = Metadata.builder(identifier).interactionModel(ixnModel);
  mutable.asDataset().getGraph(Trellis.PreferUserManaged).ifPresent(graph -> {
    graph.stream(identifier, LDP.membershipResource, null).findFirst().map(Triple::getObject)
      .filter(IRI.class::isInstance).map(IRI.class::cast).ifPresent(builder::membershipResource);
    graph.stream(identifier, LDP.hasMemberRelation, null).findFirst().map(Triple::getObject)
      .filter(IRI.class::isInstance).map(IRI.class::cast).ifPresent(builder::memberRelation);
    graph.stream(identifier, LDP.isMemberOfRelation, null).findFirst().map(Triple::getObject)
      .filter(IRI.class::isInstance).map(IRI.class::cast).ifPresent(builder::memberOfRelation);
    graph.stream(identifier, LDP.insertedContentRelation, null).findFirst().map(Triple::getObject)
      .filter(IRI.class::isInstance).map(IRI.class::cast).ifPresent(builder::insertedContentRelation);
  });
  return builder;
}

代码示例来源：origin: org.apache.commons/commons-rdf-api

@Test
public void getGraphNull() throws Exception {
  assertTrue(dataset.getGraph(null).get() instanceof DummyGraph);
}

代码示例来源：origin: org.trellisldp.ext/trellis-db

private static void updateExtra(final Handle handle, final int resourceId, final IRI identifier,
    final Dataset dataset) {
  dataset.getGraph(PreferUserManaged).ifPresent(graph -> {
    final String query = "INSERT INTO extra (resource_id, predicate, object) VALUES (?, ?, ?)";
    try (final PreparedBatch batch = handle.prepareBatch(query)) {
      graph.stream(identifier, LDP.inbox, null).map(Triple::getObject).filter(t -> t instanceof IRI)
        .map(t -> ((IRI) t).getIRIString()).findFirst().ifPresent(iri ->
            batch.bind(0, resourceId)
               .bind(1, LDP.inbox.getIRIString())
               .bind(2, iri)
               .add());
      graph.stream(identifier, OA.annotationService, null).map(Triple::getObject)
         .filter(t -> t instanceof IRI).map(t -> ((IRI) t).getIRIString()).findFirst().ifPresent(iri ->
            batch.bind(0, resourceId)
               .bind(1, OA.annotationService.getIRIString())
               .bind(2, iri).add());
      if (batch.size() > 0) {
        batch.execute();
      }
    }
  });
}

代码示例来源：origin: org.apache.commons/commons-rdf-api

@Test
public void getGraph() throws Exception {
  assertTrue(dataset.getGraph() instanceof DummyGraph);
}

代码示例来源：origin: org.trellisldp/trellis-triplestore

@Override
public CompletionStage<Void> add(final IRI id, final Dataset dataset) {
  return runAsync(() -> {
    final IRI graphName = rdf.createIRI(id.getIRIString() + "?ext=audit");
    try (final Dataset data = rdf.createDataset()) {
      dataset.getGraph(PreferAudit).ifPresent(g ->
          g.stream().forEach(t -> data.add(graphName, t.getSubject(), t.getPredicate(), t.getObject())));
      executeWrite(rdfConnection, () -> rdfConnection.loadDataset(asJenaDataset(data)));
    } catch (final Exception ex) {
      throw new RuntimeTrellisException("Error storing audit dataset for " + id, ex);
    }
  });
}

代码示例来源：origin: trellis-ldp/trellis

@Override
public CompletionStage<Void> add(final IRI id, final Dataset dataset) {
  return runAsync(() -> {
    final IRI graphName = rdf.createIRI(id.getIRIString() + "?ext=audit");
    try (final Dataset data = rdf.createDataset()) {
      dataset.getGraph(PreferAudit).ifPresent(g ->
          g.stream().forEach(t -> data.add(graphName, t.getSubject(), t.getPredicate(), t.getObject())));
      executeWrite(rdfConnection, () -> rdfConnection.loadDataset(asJenaDataset(data)));
    } catch (final Exception ex) {
      throw new RuntimeTrellisException("Error storing audit dataset for " + id, ex);
    }
  });
}

代码示例来源：origin: org.apache.commons/commons-rdf-api

@Test
public void getGraphNamed() throws Exception {
  assertFalse(dataset.getGraph(new DummyIRI(0)).isPresent());
}

代码示例来源：origin: trellis-ldp/trellis

@Test
public void testAuditUpdate() {
  final Dataset dataset = rdf.createDataset();
  final AuditService svc = new DefaultAuditService() {};
  svc.update(subject, mockSession).forEach(dataset::add);
  assertTrue(dataset.getGraph(Trellis.PreferAudit).filter(graph -> graph.size() == dataset.size()).isPresent());
  assertTrue(dataset.contains(null, null, type, AS.Update));
  assertAll("Event property check", checkEventProperties(dataset));
}

代码示例来源：origin: trellis-ldp/trellis

@Test
public void testAuditCreation() {
  final Dataset dataset = rdf.createDataset();
  final AuditService svc = new DefaultAuditService() {};
  svc.creation(subject, mockSession).forEach(dataset::add);
  assertTrue(dataset.getGraph(Trellis.PreferAudit).filter(graph -> graph.size() == dataset.size()).isPresent(),
      "Graph and dataset sizes don't match for creation event!");
  assertTrue(dataset.contains(null, null, type, AS.Create), "as:Create type not in create dataset!");
  assertAll("Event property check", checkEventProperties(dataset));
}

代码示例来源：origin: trellis-ldp/trellis

@Test
public void testAuditDeletion() {
  final Dataset dataset = rdf.createDataset();
  final AuditService svc = new DefaultAuditService() {};
  svc.deletion(subject, mockSession).forEach(dataset::add);
  assertTrue(dataset.getGraph(Trellis.PreferAudit).filter(graph -> graph.size() == dataset.size()).isPresent(),
      "Graph and dataset sizes don't match for deletion event!");
  assertTrue(dataset.contains(null, null, type, AS.Delete), "as:Delete type not in delete dataset!");
  assertAll("Event property check", checkEventProperties(dataset));
}

代码示例来源：origin: org.apache.commons/commons-rdf-api

@Test
public void getGraphNull() throws Exception {
  // Default graph should be present
  try (final Graph defaultGraph = dataset.getGraph(null).get()) {
    // TODO: Can we assume the default graph was empty before our new triples?
    assertEquals(2, defaultGraph.size());
    assertTrue(defaultGraph.contains(alice, isPrimaryTopicOf, graph1));
    // NOTE: wildcard as graph2 is a (potentially mapped) BlankNode
    assertTrue(defaultGraph.contains(bob, isPrimaryTopicOf, null));
  }
}

代码示例来源：origin: org.apache.commons/commons-rdf-api

@Test
public void getGraph2() throws Exception {
  // graph2 should be present, even if is named by a BlankNode
  // We'll look up the potentially mapped graph2 blanknode
  final BlankNodeOrIRI graph2Name = (BlankNodeOrIRI) dataset.stream(Optional.empty(), bob, isPrimaryTopicOf, null)
      .map(Quad::getObject).findAny().get();
  try (final Graph g2 = dataset.getGraph(graph2Name).get()) {
    assertEquals(4, g2.size());
    final Triple bobNameTriple = bobNameQuad.asTriple();
    assertTrue(g2.contains(bobNameTriple));
    assertTrue(g2.contains(bob, member, bnode1));
    assertTrue(g2.contains(bob, member, bnode2));
    assertFalse(g2.contains(bnode1, name, secretClubName));
    assertTrue(g2.contains(bnode2, name, companyName));
  }
}

代码示例来源：origin: org.apache.commons/commons-rdf-api

@Test
public void getGraph() throws Exception {
  try (final Graph defaultGraph = dataset.getGraph()) {
    // TODO: Can we assume the default graph was empty before our new triples?
    assertEquals(2, defaultGraph.size());
    assertTrue(defaultGraph.contains(alice, isPrimaryTopicOf, graph1));
    // NOTE: graph2 is a BlankNode
    assertTrue(defaultGraph.contains(bob, isPrimaryTopicOf, null));
  }
}

代码示例来源：origin: org.apache.commons/commons-rdf-api

@Test
public void getGraph1() throws Exception {
  // graph1 should be present
  try (final Graph g1 = dataset.getGraph(graph1).get()) {
    assertEquals(4, g1.size());
    assertTrue(g1.contains(alice, name, aliceName));
    assertTrue(g1.contains(alice, knows, bob));
    assertTrue(g1.contains(alice, member, null));
    assertTrue(g1.contains(null, name, secretClubName));
  }
}

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