org.neo4j.graphdb.Node.getDegree()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.getDegree()方法的一些代码示例，展示了Node.getDegree()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.getDegree()方法的具体详情如下：
包路径：org.neo4j.graphdb.Node
类名称：Node
方法名：getDegree

Node.getDegree介绍

[英]Returns the number of relationships connected to this node regardless of direction or type. This operation is always O(1).
[中]返回连接到此节点的关系数，无论其方向或类型如何。此操作始终为O（1）。

代码示例

代码示例来源：origin: neo4j/neo4j

  1. @SuppressWarnings( "unchecked" )
  2. public Representation getNodeDegree( long nodeId, RelationshipDirection direction, Collection<String> types )
  3.     throws NodeNotFoundException
  4. {
  5.   Node node = node( nodeId );
  6.   if ( types.isEmpty() )
  7.   {
  8.     return PropertiesRepresentation.value( node.getDegree( direction.internal ) );
  9.   }
  10.   else
  11.   {
  12.     int sum = 0;
  13.     for ( String type : types )
  14.     {
  15.       sum += node.getDegree( RelationshipType.withName( type ), direction.internal );
  16.     }
  17.     return PropertiesRepresentation.value( sum );
  18.   }
  19. }

代码示例来源：origin: neo4j/neo4j

  1. private void assertCounts( Node me, Map<RelType, int[]> expectedCounts )
  2. {
  3.   assertEquals( totalCount( expectedCounts, Direction.BOTH ), me.getDegree() );
  4.   assertEquals( totalCount( expectedCounts, Direction.BOTH ), me.getDegree( Direction.BOTH ) );
  5.   assertEquals( totalCount( expectedCounts, Direction.OUTGOING ), me.getDegree( Direction.OUTGOING ) );
  6.   assertEquals( totalCount( expectedCounts, Direction.INCOMING ), me.getDegree( Direction.INCOMING ) );
  7.   for ( Map.Entry<RelType, int[]> entry : expectedCounts.entrySet() )
  8.   {
  9.     RelType type = entry.getKey();
  10.     assertEquals( totalCount( entry.getValue(), Direction.BOTH ), me.getDegree( type ) );
  11.     assertEquals( totalCount( entry.getValue(), Direction.OUTGOING ), me.getDegree( type, Direction.OUTGOING ) );
  12.     assertEquals( totalCount( entry.getValue(), Direction.INCOMING ), me.getDegree( type, Direction.INCOMING ) );
  13.     assertEquals( totalCount( entry.getValue(), Direction.BOTH ), me.getDegree( type, Direction.BOTH ) );
  14.   }
  15. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void movingBilaterallyOfTheDenseNodeThresholdIsConsistent()
  3. {
  4.   // GIVEN
  5.   GraphDatabaseService db = databaseRule.getGraphDatabaseAPI();
  6.   Node root;
  7.   // WHEN
  8.   try ( Transaction tx = db.beginTx() )
  9.   {
  10.     root = db.createNode();
  11.     createRelationshipsOnNode( db, root, 100 );
  12.     deleteRelationshipsFromNode( root, 80 );
  13.     assertEquals( 20, root.getDegree() );
  14.     assertEquals( 20, root.getDegree( Direction.OUTGOING ) );
  15.     assertEquals( 0, root.getDegree( Direction.INCOMING ) );
  16.     tx.success();
  17.   }
  18.   // THEN
  19.   try ( Transaction tx = db.beginTx() )
  20.   {
  21.     assertEquals( 20, root.getDegree() );
  22.     assertEquals( 20, root.getDegree( Direction.OUTGOING ) );
  23.     assertEquals( 0, root.getDegree( Direction.INCOMING ) );
  24.     tx.success();
  25.   }
  26. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void withLoops()
  3. {
  4.   // Just to make sure it doesn't work by accident what with ids aligning with count
  5.   for ( int i = 0; i < 10; i++ )
  6.   {
  7.     getGraphDb().createNode().createRelationshipTo( getGraphDb().createNode(), MyRelTypes.TEST );
  8.   }
  9.   Node node = getGraphDb().createNode();
  10.   assertEquals( 0, node.getDegree() );
  11.   node.createRelationshipTo( node, MyRelTypes.TEST );
  12.   assertEquals( 1, node.getDegree() );
  13.   Node otherNode = getGraphDb().createNode();
  14.   Relationship rel2 = node.createRelationshipTo( otherNode, MyRelTypes.TEST2 );
  15.   assertEquals( 2, node.getDegree() );
  16.   assertEquals( 1, otherNode.getDegree() );
  17.   newTransaction();
  18.   assertEquals( 2, node.getDegree() );
  19.   Relationship rel3 = node.createRelationshipTo( node, MyRelTypes.TEST_TRAVERSAL );
  20.   assertEquals( 3, node.getDegree() );
  21.   assertEquals( 1, otherNode.getDegree() );
  22.   rel2.delete();
  23.   assertEquals( 2, node.getDegree() );
  24.   assertEquals( 0, otherNode.getDegree() );
  25.   rel3.delete();
  26.   assertEquals( 1, node.getDegree() );
  27. }

代码示例来源：origin: neo4j/neo4j

  1. assertEquals( 100, source.getDegree() );
  2. assertEquals( 100, source.getDegree( Direction.OUTGOING ) );
  3. assertEquals( 0, source.getDegree( Direction.INCOMING ) );
  4. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type0" ) ) );
  5. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type1" ) ) );
  6. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type2" ) ) );
  7. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type3" ) ) );
  8. assertEquals( 100, sink.getDegree() );
  9. assertEquals( 0, sink.getDegree( Direction.OUTGOING ) );
  10. assertEquals( 100, sink.getDegree( Direction.INCOMING ) );
  11. assertEquals( 25, sink.getDegree( RelationshipType.withName( "Type0" ) ) );
  12. assertEquals( 25, sink.getDegree( RelationshipType.withName( "Type1" ) ) );
  13. assertEquals( 25, sink.getDegree( RelationshipType.withName( "Type2" ) ) );
  14. assertEquals( 25, sink.getDegree( RelationshipType.withName( "Type3" ) ) );
  15. tx.success();
  16. assertEquals( 100, source.getDegree() );
  17. assertEquals( 100, source.getDegree( Direction.OUTGOING ) );
  18. assertEquals( 0, source.getDegree( Direction.INCOMING ) );
  19. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type0" ) ) );
  20. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type1" ) ) );
  21. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type2" ) ) );
  22. assertEquals( 25, source.getDegree( RelationshipType.withName( "Type3" ) ) );
  23. assertEquals( 100, sink.getDegree() );
  24. assertEquals( 0, sink.getDegree( Direction.OUTGOING ) );
  25. assertEquals( 100, sink.getDegree( Direction.INCOMING ) );
  26. assertEquals( 25, sink.getDegree( RelationshipType.withName( "Type0" ) ) );

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void deletingRelationshipsFromDenseNodeIsConsistent()
  3. {
  4.   // GIVEN
  5.   GraphDatabaseService db = databaseRule.getGraphDatabaseAPI();
  6.   Node root;
  7.   try ( Transaction tx = db.beginTx() )
  8.   {
  9.     root = db.createNode();
  10.     createRelationshipsOnNode( db, root, 100 );
  11.     tx.success();
  12.   }
  13.   try ( Transaction tx = db.beginTx() )
  14.   {
  15.     deleteRelationshipsFromNode( root, 80 );
  16.     assertEquals( 20, root.getDegree() );
  17.     assertEquals( 20, root.getDegree( Direction.OUTGOING ) );
  18.     assertEquals( 0, root.getDegree( Direction.INCOMING ) );
  19.     tx.success();
  20.   }
  21.   try ( Transaction tx = db.beginTx() )
  22.   {
  23.     assertEquals( 20, root.getDegree() );
  24.     assertEquals( 20, root.getDegree( Direction.OUTGOING ) );
  25.     assertEquals( 0, root.getDegree( Direction.INCOMING ) );
  26.     tx.success();
  27.   }
  28. }

代码示例来源：origin: neo4j/neo4j

  1. assertEquals( 100, root.getDegree() );
  2. assertEquals( 100, root.getDegree( Direction.OUTGOING ) );
  3. assertEquals( 0, root.getDegree( Direction.INCOMING ) );
  4. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type0" ) ) );
  5. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type1" ) ) );
  6. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type2" ) ) );
  7. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type3" ) ) );
  8. tx.success();
  9. assertEquals( 100, root.getDegree() );
  10. assertEquals( 100, root.getDegree( Direction.OUTGOING ) );
  11. assertEquals( 0, root.getDegree( Direction.INCOMING ) );
  12. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type0" ) ) );
  13. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type1" ) ) );
  14. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type2" ) ) );
  15. assertEquals( 25, root.getDegree( RelationshipType.withName( "Type3" ) ) );
  16. tx.success();

代码示例来源：origin: neo4j/neo4j

  1. assertEquals( 0, node1.getDegree() );
  2. assertEquals( 0, node2.getDegree() );
  3. node1.createRelationshipTo( node2, MyRelTypes.TEST );
  4. assertEquals( 1, node1.getDegree() );
  5. assertEquals( 1, node2.getDegree() );
  6. node1.createRelationshipTo( getGraphDb().createNode(), MyRelTypes.TEST2 );
  7. assertEquals( 2, node1.getDegree() );
  8. assertEquals( 1, node2.getDegree() );
  9. newTransaction();
  10. assertEquals( 2, node1.getDegree() );
  11. assertEquals( 1, node2.getDegree() );
  12.   assertEquals( i + 2 + 1, node1.getDegree() );
  13.   assertEquals( i + 1 + 1, node2.getDegree() );
  14.   if ( i % 10 == 0 )
  15.   assertEquals( 1002, node1.getDegree() );
  16.   assertEquals( 1002, node1.getDegree( Direction.BOTH ) );
  17.   assertEquals( 502, node1.getDegree( Direction.OUTGOING ) );
  18.   assertEquals( 500, node1.getDegree( Direction.INCOMING ) );
  19.   assertEquals( 1, node1.getDegree( MyRelTypes.TEST2 ) );
  20.   assertEquals( 1001, node1.getDegree( MyRelTypes.TEST ) );
  21.   assertEquals( 1001, node1.getDegree( MyRelTypes.TEST, Direction.BOTH ) );
  22.   assertEquals( 501, node1.getDegree( MyRelTypes.TEST, Direction.OUTGOING ) );
  23.   assertEquals( 500, node1.getDegree( MyRelTypes.TEST, Direction.INCOMING ) );
  24.   assertEquals( 1, node1.getDegree( MyRelTypes.TEST2, Direction.OUTGOING ) );
  25.   assertEquals( 0, node1.getDegree( MyRelTypes.TEST2, Direction.INCOMING ) );
  26.   newTransaction();

代码示例来源：origin: neo4j/neo4j

  1. private void assertDegrees( Node node )
  2. {
  3.   for ( RelationshipType type : node.getRelationshipTypes() )
  4.   {
  5.     for ( Direction direction : Direction.values() )
  6.     {
  7.       long degree = node.getDegree( type, direction );
  8.       long actualDegree = count( node.getRelationships( type, direction ) );
  9.       assertEquals( actualDegree, degree );
  10.     }
  11.   }
  12. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void convertNodeToDense()
  3. {
  4.   Node node = getGraphDb().createNode();
  5.   EnumMap<MyRelTypes,Set<Relationship>> rels = new EnumMap<>( MyRelTypes.class );
  6.   for ( MyRelTypes type : MyRelTypes.values() )
  7.   {
  8.     rels.put( type, new HashSet<>() );
  9.   }
  10.   int expectedRelCount = 0;
  11.   for ( int i = 0; i < 6; i++, expectedRelCount++ )
  12.   {
  13.     MyRelTypes type = MyRelTypes.values()[i % MyRelTypes.values().length];
  14.     Relationship rel = node.createRelationshipTo( getGraphDb().createNode(), type );
  15.     rels.get( type ).add( rel );
  16.   }
  17.   newTransaction();
  18.   for ( int i = 0; i < 1000; i++, expectedRelCount++ )
  19.   {
  20.     node.createRelationshipTo( getGraphDb().createNode(), MyRelTypes.TEST );
  21.   }
  22.   assertEquals( expectedRelCount, node.getDegree() );
  23.   assertEquals( expectedRelCount, node.getDegree( Direction.BOTH ) );
  24.   assertEquals( expectedRelCount, node.getDegree( Direction.OUTGOING ) );
  25.   assertEquals( 0, node.getDegree( Direction.INCOMING ) );
  26.   assertEquals( rels.get( MyRelTypes.TEST2 ), Iterables.asSet( node.getRelationships( MyRelTypes.TEST2 ) ) );
  27.   assertEquals( join( rels.get( MyRelTypes.TEST_TRAVERSAL ), rels.get( MyRelTypes.TEST2 ) ),
  28.       Iterables.asSet( node.getRelationships( MyRelTypes.TEST_TRAVERSAL, MyRelTypes.TEST2 ) ) );
  29. }

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

  1. private int getDegreeSafe(Node node, RelationshipType relType, Direction direction) {
  2.   if (relType == null) {
  3.     return node.getDegree(direction);
  4.   }
  5.   return node.getDegree(relType, direction);
  6. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void createDenseNodeWithLowThreshold()
  3. {
  4.   newDb( 2 );
  5.   // Create node with two relationships
  6.   Node node;
  7.   try ( Transaction tx = db.beginTx() )
  8.   {
  9.     node = db.createNode();
  10.     node.createRelationshipTo( db.createNode(), MyRelTypes.TEST );
  11.     node.createRelationshipTo( db.createNode(), MyRelTypes.TEST2 );
  12.     assertEquals( 2, node.getDegree() );
  13.     assertEquals( 1, node.getDegree( MyRelTypes.TEST ) );
  14.     assertEquals( 1, node.getDegree( MyRelTypes.TEST2 ) );
  15.     tx.success();
  16.   }
  17.   try ( Transaction tx = db.beginTx() )
  18.   {
  19.     node.createRelationshipTo( db.createNode(), MyRelTypes.TEST );
  20.     tx.success();
  21.   }
  22.   db.shutdown();
  23. }

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

  1. private void add(Node node) {
  2.   count++;
  3.   int degree = node.getDegree();
  4.   sumDegree += degree;
  5.   if (degree > maxDegree) maxDegree = degree;
  6.   if (degree < minDegree) minDegree = degree;
  7.   for (Label label : node.getLabels()) labels.add(label.name());
  8.   for (String key : node.getPropertyKeys()) properties.add(key);
  9. }
  10. Map<String,Object> toMap() {

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldRollbackRelationshipOnFailure() throws Exception
  3. {
  4.   long n1, n2;
  5.   try ( org.neo4j.graphdb.Transaction tx = graphDb.beginTx() )
  6.   {
  7.     n1 = graphDb.createNode().getId();
  8.     n2 = graphDb.createNode().getId();
  9.     tx.success();
  10.   }
  11.   try ( Transaction tx = beginTransaction() )
  12.   {
  13.     int label = tx.token().relationshipTypeGetOrCreateForName( "R" );
  14.     tx.dataWrite().relationshipCreate( n1, label, n2 );
  15.     tx.failure();
  16.   }
  17.   try ( org.neo4j.graphdb.Transaction ignore = graphDb.beginTx() )
  18.   {
  19.     assertEquals( 0, graphDb.getNodeById( n1 ).getDegree() );
  20.   }
  21. }

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

  1. @UserFunction("apoc.node.degree.out")
  2. @Description("apoc.node.degree.out(node, relationshipName) - returns total number number of outgoing relationships")
  3. public long degreeOut(@Name("node") Node node, @Name(value = "types",defaultValue = "") String type) {
  4.   if (type==null || type.isEmpty()) {
  5.     return node.getDegree(Direction.OUTGOING);
  6.   }
  7.   return node.getDegree(RelationshipType.withName(type), Direction.OUTGOING);
  8. }

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldDeleteRelationship() throws Exception
  3. {
  4.   long n1, r;
  5.   try ( org.neo4j.graphdb.Transaction tx = graphDb.beginTx() )
  6.   {
  7.     Node node1 = graphDb.createNode();
  8.     Node node2 = graphDb.createNode();
  9.     n1 = node1.getId();
  10.     r = node1.createRelationshipTo( node2, RelationshipType.withName( "R" ) ).getId();
  11.     tx.success();
  12.   }
  13.   try ( Transaction tx = beginTransaction() )
  14.   {
  15.     assertTrue( "should delete relationship", tx.dataWrite().relationshipDelete( r ) );
  16.     tx.success();
  17.   }
  18.   try ( org.neo4j.graphdb.Transaction ignore = graphDb.beginTx() )
  19.   {
  20.     assertEquals( 0, graphDb.getNodeById( n1 ).getDegree() );
  21.   }
  22. }

代码示例来源：origin: neo4j/neo4j

  1. assertEquals( 1, otherNode.getDegree() );

代码示例来源：origin: neo4j/neo4j

  1. @Test
  2. public void shouldDeleteRelationshipAddedInTransaction() throws Exception
  3. {
  4.   long n1, n2;
  5.   try ( org.neo4j.graphdb.Transaction tx = graphDb.beginTx() )
  6.   {
  7.     n1 = graphDb.createNode().getId();
  8.     n2 = graphDb.createNode().getId();
  9.     tx.success();
  10.   }
  11.   try ( Transaction tx = beginTransaction() )
  12.   {
  13.     int label = tx.token().relationshipTypeGetOrCreateForName( "R" );
  14.     long r = tx.dataWrite().relationshipCreate( n1, label, n2 );
  15.     assertTrue( tx.dataWrite().relationshipDelete( r ) );
  16.     tx.success();
  17.   }
  18.   try ( org.neo4j.graphdb.Transaction ignore = graphDb.beginTx() )
  19.   {
  20.     assertEquals( 0, graphDb.getNodeById( n1 ).getDegree() );
  21.   }
  22. }

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

  1. @UserFunction("apoc.node.degree")
  2. @Description("apoc.node.degree(node, rel-direction-pattern) - returns total degrees of the given relationships in the pattern, can use '>' or '<' for all outgoing or incoming relationships")
  3. public long degree(@Name("node") Node node, @Name(value = "types",defaultValue = "") String types) {
  4.   if (types==null || types.isEmpty()) return node.getDegree();
  5.   long degree = 0;
  6.   for (Pair<RelationshipType, Direction> pair : parse(types)) {
  7.     degree += getDegreeSafe(node, pair.first(), pair.other());
  8.   }
  9.   return degree;
  10. }

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

  1. private void sampleRels(int sampleSize, Sampler sampler, Label label, int count, Node node, RelationshipType type) {
  2.   Direction direction = Direction.OUTGOING;
  3.   int degree = node.getDegree(type, direction);
  4.   sampler.sample(label,count,node,type,direction,degree,null);
  5.   if (degree==0) return;
  6.   ResourceIterator<Relationship> relIt = ((ResourceIterable<Relationship>)node.getRelationships(direction, type)).iterator();
  7.   int relCount = 0;
  8.   while (relIt.hasNext() && relCount++ < sampleSize) {
  9.     sampler.sample(label,count,node,type,direction,degree,relIt.next());
  10.   }
  11.   relIt.close();
  12. }

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