org.neo4j.graphdb.Node.hasLabel()方法的使用及代码示例

x33g5p2x  于2022-01-24 转载在 其他  
字(7.6k)|赞(0)|评价(0)|浏览(89)

本文整理了Java中org.neo4j.graphdb.Node.hasLabel()方法的一些代码示例，展示了Node.hasLabel()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。Node.hasLabel()方法的具体详情如下：
包路径：org.neo4j.graphdb.Node
类名称：Node
方法名：hasLabel

Node.hasLabel介绍

[英]Checks whether or not this node has the given label.
[中]检查此节点是否具有给定的标签。

代码示例

代码示例来源：origin: neo4j/neo4j

private boolean nodeHasLabels( Node node, String[] labels )
{
  for ( String name : labels )
  {
    if ( !node.hasLabel( Label.label( name ) ) )
    {
      return false;
    }
  }
  return true;
}

代码示例来源：origin: neo4j/neo4j

@Override
  protected boolean matchesSafely( Node item, Description mismatchDescription )
  {
    boolean result = item.hasLabel( myLabel );
    if ( !result )
    {
      Set<String> labels = asLabelNameSet( item.getLabels() );
      mismatchDescription.appendText( labels.toString() );
    }
    return result;
  }
};

代码示例来源：origin: neo4j/neo4j

@Test
@Graph( { "a:Person EATS b:Banana", "a EATS b:Apple" } )
public void ensurePeopleCanEatBananasAndApples()
{
  Map<String,Node> graph = data.get();
  Node a = graph.get( "a" );
  Node b = graph.get( "b" );
  try ( Transaction ignored = graphdb.beginTx() )
  {
    assertTrue( "Person label missing", a.hasLabel( label( "Person" ) ) );
    assertTrue( "Banana label missing", b.hasLabel( label( "Banana" ) ) );
    assertTrue( "Apple label missing", b.hasLabel( label( "Apple" ) ) );
  }
}

代码示例来源：origin: neo4j/neo4j

@Test
@Graph( { "a:Person EATS b:Banana" } )
public void ensurePeopleCanEatBananas()
{
  Map<String,Node> graph = data.get();
  Node a = graph.get( "a" );
  Node b = graph.get( "b" );
  try ( Transaction ignored = graphdb.beginTx() )
  {
    assertTrue( a.hasLabel( label( "Person" ) ) );
    assertTrue( b.hasLabel( label( "Banana" ) ) );
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
  void perform( Graph graph, ExpectedTransactionData expectations )
  {
    Node node = graph.randomNode();
    if ( node != null )
    {
      Label label = graph.randomLabel();
      if ( node.hasLabel( label ) )
      {
        node.removeLabel( label );
        expectations.removedLabel( node, label );
        debug( node + " " + label );
      }
    }
  }
},

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldHandleAdditiveLabelsWithSpaces() throws Exception
{
  // GIVEN
  List<String> nodeIds = nodeIds();
  Configuration config = Configuration.COMMAS;
  final Label label1 = label( "My First Label" );
  final Label label2 = label( "My Other Label" );
  // WHEN
  importTool(
      "--into", dbRule.getDatabaseDirAbsolutePath(),
      "--nodes:My First Label:My Other Label",
      nodeData( true, config, nodeIds, TRUE ).getAbsolutePath(),
      "--relationships", relationshipData( true, config, nodeIds, TRUE, true ).getAbsolutePath() );
  // THEN
  verifyData( node ->
  {
    assertTrue( node.hasLabel( label1 ) );
    assertTrue( node.hasLabel( label2 ) );
  }, Validators.emptyValidator() );
}

代码示例来源：origin: neo4j/neo4j

@Override
  void perform( Graph graph, ExpectedTransactionData expectations )
  {
    Node node = graph.randomNode();
    if ( node != null )
    {
      Label label = graph.randomLabel();
      if ( !node.hasLabel( label ) )
      {
        node.addLabel( label );
        expectations.assignedLabel( node, label );
        debug( node + " " + label );
      }
    }
  }
},

代码示例来源：origin: neo4j/neo4j

private void assertNode( ResourceIterator<Node> reader, int id )
{
  assertTrue( reader.hasNext() );
  Node node = reader.next();
  assertTrue( node.hasLabel( LABEL ) );
  assertEquals( "Expected node " + node + " (returned by index reader) to have 'id' property w/ value " + id,
      id, node.getProperty( KEY ) );
}

代码示例来源：origin: neo4j/neo4j

@Test
public void removingUncommittedLabel()
{
  // Given
  GraphDatabaseService beansAPI = dbRule.getGraphDatabaseAPI();
  Label label = Labels.MY_LABEL;
  // When
  Node myNode;
  try ( Transaction tx = beansAPI.beginTx() )
  {
    myNode = beansAPI.createNode();
    myNode.addLabel( label );
    myNode.removeLabel( label );
    // THEN
    assertFalse( myNode.hasLabel( label ) );
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

if ( !node.hasLabel( label ) )

代码示例来源：origin: neo4j/neo4j

for ( Node node : filter( n -> n.hasLabel( label ) && n.hasProperty( NAME_PROPERTY ), db.getAllNodes() ) )

代码示例来源：origin: neo4j-contrib/neo4j-apoc-procedures

private Node copyLabels(Node source, Node target) {
  for (Label label : source.getLabels()) {
    if (!target.hasLabel(label)) {
      target.addLabel(label);
    }
  }
  return target;
}

代码示例来源：origin: neo4j/neo4j

@Test
public void shouldWorkWithPoint2DArrays() throws Exception
{
  HTTP.Response response =
      runQuery( "create (:Node {points: [point({x:1, y:1}), point({x:2, y:2}), point({x: 3.0, y: 3.0})]})" );
  assertEquals( 200, response.status() );
  assertNoErrors( response );
  GraphDatabaseFacade db = server().getDatabase().getGraph();
  try ( Transaction tx = db.beginTx() )
  {
    for ( Node node : db.getAllNodes() )
    {
      if ( node.hasLabel( label( "Node" ) ) && node.hasProperty( "points" ) )
      {
        Point[] points = (Point[]) node.getProperty( "points" );
        verifyPoint( points[0], Cartesian, 1.0, 1.0 );
        verifyPoint( points[1], Cartesian, 2.0, 2.0 );
        verifyPoint( points[2], Cartesian, 3.0, 3.0 );
      }
    }
    tx.success();
  }
}

代码示例来源：origin: neo4j/neo4j

for ( Label label : labels )
  assertTrue( node.hasLabel( label ) );

代码示例来源：origin: neo4j-contrib/neo4j-apoc-procedures

@UserFunction("apoc.label.exists")
  @Description("apoc.label.exists(element, label) - returns true or false related to label existance")
  public boolean exists(@Name("node") Object element, @Name("label") String label) {

    return element instanceof Node ? ((Node) element).hasLabel(org.neo4j.graphdb.Label.label(label)) :
        element instanceof Relationship ? ((Relationship) element).isType(RelationshipType.withName(label)) : false;

  }
}

代码示例来源：origin: neo4j-contrib/neo4j-apoc-procedures

@Test public void testCreateNodes() throws Exception {
  testResult(db, "CALL apoc.create.nodes(['Person'],[{name:'John'},{name:'Jane'}])",
       (res) -> {
         Node node = (Node) res.next().get("node");
        assertEquals(true, node.hasLabel(PERSON));
        assertEquals("John", node.getProperty("name"));
        node = (Node) res.next().get("node");
        assertEquals(true, node.hasLabel(PERSON));
        assertEquals("Jane", node.getProperty("name"));
      });
}
@Test public void testCreateRelationship() throws Exception {

代码示例来源：origin: neo4j-contrib/neo4j-apoc-procedures

@Test public void testVirtualNodeFunction() throws Exception {
  testCall(db, "RETURN apoc.create.vNode(['Person'],{name:'John'}) as node",
      (row) -> {
        Node node = (Node) row.get("node");
        assertEquals(true, node.hasLabel(Label.label("Person")));
        assertEquals("John", node.getProperty("name"));
      });
}
@Test public void testCreateNodes() throws Exception {

代码示例来源：origin: neo4j-contrib/neo4j-apoc-procedures

private void assertPath(Map<String, Object> row, int length, String startLabel, String endLabel) {
    Path p = (Path) row.get("p");
    assertEquals(length,p.length());
    assertEquals(true,p.startNode().hasLabel(Label.label(startLabel)));
    assertEquals(true,p.endNode().hasLabel(Label.label(endLabel)));
    assertEquals(length > 0,p.relationships().iterator().hasNext());
    for (Relationship rel : p.relationships()) {
      assertEquals("NEXT",rel.getType().name());
    }
  }
}

代码示例来源：origin: neo4j-contrib/neo4j-apoc-procedures

@Test
public void testDeleteOneNode() throws Exception {
  long id = db.execute("CREATE (p1:Person {ID:1}), (p2:Person {ID:2}) RETURN id(p1) as id ").<Long>columnAs("id").next();
  testCall(db, "MATCH (o:Person {ID:{oldID}}), (n:Person {ID:{newID}}) DELETE o RETURN n as node",
         map("oldID", 1L, "newID",2L),
      (r) -> {
        Node node = (Node) r.get("node");
        assertNotEquals(id, node.getId());
        assertEquals(true, node.hasLabel(Label.label("Person")));
        assertEquals(2L, node.getProperty("ID"));
      });
}

代码示例来源：origin: neo4j-contrib/neo4j-apoc-procedures

@Test
public void testGroupAllLabels() throws Exception {
  db.execute("CREATE (u:User {name:'Joe',gender:'male'})").close();
  ResourceIterator<Node> it = db.execute("CALL apoc.nodes.group(['*'],['gender'])").columnAs("node");
  assertEquals(true,(it.next()).hasLabel(Label.label("User")));
  assertFalse(it.hasNext());
}
@Test

内容来源于网络，如有侵权，请联系作者删除！

Node

相关文章

    查看更多
    微信公众号

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新文章

    更多
    • 蜀ICP备13028337号-1 大数据知识库 https://www.saoniuhuo.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com