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  
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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

  1. private boolean nodeHasLabels( Node node, String[] labels )
  2. {
  3.   for ( String name : labels )
  4.   {
  5.     if ( !node.hasLabel( Label.label( name ) ) )
  6.     {
  7.       return false;
  8.     }
  9.   }
  10.   return true;
  11. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   protected boolean matchesSafely( Node item, Description mismatchDescription )
  3.   {
  4.     boolean result = item.hasLabel( myLabel );
  5.     if ( !result )
  6.     {
  7.       Set<String> labels = asLabelNameSet( item.getLabels() );
  8.       mismatchDescription.appendText( labels.toString() );
  9.     }
  10.     return result;
  11.   }
  12. };

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. @Graph( { "a:Person EATS b:Banana", "a EATS b:Apple" } )
  3. public void ensurePeopleCanEatBananasAndApples()
  4. {
  5.   Map<String,Node> graph = data.get();
  6.   Node a = graph.get( "a" );
  7.   Node b = graph.get( "b" );
  8.   try ( Transaction ignored = graphdb.beginTx() )
  9.   {
  10.     assertTrue( "Person label missing", a.hasLabel( label( "Person" ) ) );
  11.     assertTrue( "Banana label missing", b.hasLabel( label( "Banana" ) ) );
  12.     assertTrue( "Apple label missing", b.hasLabel( label( "Apple" ) ) );
  13.   }
  14. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. @Graph( { "a:Person EATS b:Banana" } )
  3. public void ensurePeopleCanEatBananas()
  4. {
  5.   Map<String,Node> graph = data.get();
  6.   Node a = graph.get( "a" );
  7.   Node b = graph.get( "b" );
  8.   try ( Transaction ignored = graphdb.beginTx() )
  9.   {
  10.     assertTrue( a.hasLabel( label( "Person" ) ) );
  11.     assertTrue( b.hasLabel( label( "Banana" ) ) );
  12.   }
  13. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   void perform( Graph graph, ExpectedTransactionData expectations )
  3.   {
  4.     Node node = graph.randomNode();
  5.     if ( node != null )
  6.     {
  7.       Label label = graph.randomLabel();
  8.       if ( node.hasLabel( label ) )
  9.       {
  10.         node.removeLabel( label );
  11.         expectations.removedLabel( node, label );
  12.         debug( node + " " + label );
  13.       }
  14.     }
  15.   }
  16. },

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldHandleAdditiveLabelsWithSpaces() throws Exception
  3. {
  4.   // GIVEN
  5.   List<String> nodeIds = nodeIds();
  6.   Configuration config = Configuration.COMMAS;
  7.   final Label label1 = label( "My First Label" );
  8.   final Label label2 = label( "My Other Label" );
  9.   // WHEN
  10.   importTool(
  11.       "--into", dbRule.getDatabaseDirAbsolutePath(),
  12.       "--nodes:My First Label:My Other Label",
  13.       nodeData( true, config, nodeIds, TRUE ).getAbsolutePath(),
  14.       "--relationships", relationshipData( true, config, nodeIds, TRUE, true ).getAbsolutePath() );
  15.   // THEN
  16.   verifyData( node ->
  17.   {
  18.     assertTrue( node.hasLabel( label1 ) );
  19.     assertTrue( node.hasLabel( label2 ) );
  20.   }, Validators.emptyValidator() );
  21. }

代码示例来源：origin: neo4j/neo4j

  1. @Override
  2.   void perform( Graph graph, ExpectedTransactionData expectations )
  3.   {
  4.     Node node = graph.randomNode();
  5.     if ( node != null )
  6.     {
  7.       Label label = graph.randomLabel();
  8.       if ( !node.hasLabel( label ) )
  9.       {
  10.         node.addLabel( label );
  11.         expectations.assignedLabel( node, label );
  12.         debug( node + " " + label );
  13.       }
  14.     }
  15.   }
  16. },

代码示例来源：origin: neo4j/neo4j

  1. private void assertNode( ResourceIterator<Node> reader, int id )
  2. {
  3.   assertTrue( reader.hasNext() );
  4.   Node node = reader.next();
  5.   assertTrue( node.hasLabel( LABEL ) );
  6.   assertEquals( "Expected node " + node + " (returned by index reader) to have 'id' property w/ value " + id,
  7.       id, node.getProperty( KEY ) );
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void removingUncommittedLabel()
  3. {
  4.   // Given
  5.   GraphDatabaseService beansAPI = dbRule.getGraphDatabaseAPI();
  6.   Label label = Labels.MY_LABEL;
  7.   // When
  8.   Node myNode;
  9.   try ( Transaction tx = beansAPI.beginTx() )
  10.   {
  11.     myNode = beansAPI.createNode();
  12.     myNode.addLabel( label );
  13.     myNode.removeLabel( label );
  14.     // THEN
  15.     assertFalse( myNode.hasLabel( label ) );
  16.     tx.success();
  17.   }
  18. }

代码示例来源：origin: neo4j/neo4j

  1. if ( !node.hasLabel( label ) )

代码示例来源：origin: neo4j/neo4j

  1. 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

  1. private Node copyLabels(Node source, Node target) {
  2.   for (Label label : source.getLabels()) {
  3.     if (!target.hasLabel(label)) {
  4.       target.addLabel(label);
  5.     }
  6.   }
  7.   return target;
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldWorkWithPoint2DArrays() throws Exception
  3. {
  4.   HTTP.Response response =
  5.       runQuery( "create (:Node {points: [point({x:1, y:1}), point({x:2, y:2}), point({x: 3.0, y: 3.0})]})" );
  6.   assertEquals( 200, response.status() );
  7.   assertNoErrors( response );
  8.   GraphDatabaseFacade db = server().getDatabase().getGraph();
  9.   try ( Transaction tx = db.beginTx() )
  10.   {
  11.     for ( Node node : db.getAllNodes() )
  12.     {
  13.       if ( node.hasLabel( label( "Node" ) ) && node.hasProperty( "points" ) )
  14.       {
  15.         Point[] points = (Point[]) node.getProperty( "points" );
  16.         verifyPoint( points[0], Cartesian, 1.0, 1.0 );
  17.         verifyPoint( points[1], Cartesian, 2.0, 2.0 );
  18.         verifyPoint( points[2], Cartesian, 3.0, 3.0 );
  19.       }
  20.     }
  21.     tx.success();
  22.   }
  23. }

代码示例来源：origin: neo4j/neo4j

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

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

  1. @UserFunction("apoc.label.exists")
  2.   @Description("apoc.label.exists(element, label) - returns true or false related to label existance")
  3.   public boolean exists(@Name("node") Object element, @Name("label") String label) {
  5.     return element instanceof Node ? ((Node) element).hasLabel(org.neo4j.graphdb.Label.label(label)) :
  6.         element instanceof Relationship ? ((Relationship) element).isType(RelationshipType.withName(label)) : false;
  8.   }
  9. }

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

  1. @Test public void testCreateNodes() throws Exception {
  2.   testResult(db, "CALL apoc.create.nodes(['Person'],[{name:'John'},{name:'Jane'}])",
  3.        (res) -> {
  4.          Node node = (Node) res.next().get("node");
  5.         assertEquals(true, node.hasLabel(PERSON));
  6.         assertEquals("John", node.getProperty("name"));
  7.         node = (Node) res.next().get("node");
  8.         assertEquals(true, node.hasLabel(PERSON));
  9.         assertEquals("Jane", node.getProperty("name"));
  10.       });
  11. }
  12. @Test public void testCreateRelationship() throws Exception {

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

  1. @Test public void testVirtualNodeFunction() throws Exception {
  2.   testCall(db, "RETURN apoc.create.vNode(['Person'],{name:'John'}) as node",
  3.       (row) -> {
  4.         Node node = (Node) row.get("node");
  5.         assertEquals(true, node.hasLabel(Label.label("Person")));
  6.         assertEquals("John", node.getProperty("name"));
  7.       });
  8. }
  9. @Test public void testCreateNodes() throws Exception {

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

  1. private void assertPath(Map<String, Object> row, int length, String startLabel, String endLabel) {
  2.     Path p = (Path) row.get("p");
  3.     assertEquals(length,p.length());
  4.     assertEquals(true,p.startNode().hasLabel(Label.label(startLabel)));
  5.     assertEquals(true,p.endNode().hasLabel(Label.label(endLabel)));
  6.     assertEquals(length > 0,p.relationships().iterator().hasNext());
  7.     for (Relationship rel : p.relationships()) {
  8.       assertEquals("NEXT",rel.getType().name());
  9.     }
  10.   }
  11. }

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

  1. @Test
  2. public void testDeleteOneNode() throws Exception {
  3.   long id = db.execute("CREATE (p1:Person {ID:1}), (p2:Person {ID:2}) RETURN id(p1) as id ").<Long>columnAs("id").next();
  4.   testCall(db, "MATCH (o:Person {ID:{oldID}}), (n:Person {ID:{newID}}) DELETE o RETURN n as node",
  5.          map("oldID", 1L, "newID",2L),
  6.       (r) -> {
  7.         Node node = (Node) r.get("node");
  8.         assertNotEquals(id, node.getId());
  9.         assertEquals(true, node.hasLabel(Label.label("Person")));
  10.         assertEquals(2L, node.getProperty("ID"));
  11.       });
  12. }

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

  1. @Test
  2. public void testGroupAllLabels() throws Exception {
  3.   db.execute("CREATE (u:User {name:'Joe',gender:'male'})").close();
  4.   ResourceIterator<Node> it = db.execute("CALL apoc.nodes.group(['*'],['gender'])").columnAs("node");
  5.   assertEquals(true,(it.next()).hasLabel(Label.label("User")));
  6.   assertFalse(it.hasNext());
  7. }
  8. @Test

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