Java RelationshipType類代碼示例

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
private Set<DirectedRelationshipType> resolveRelationships(String key, String value) {
  Set<DirectedRelationshipType> rels = new HashSet<>();
  String cypherIn = String.format("[%s:%s]", key, value);
  String cypherOut = cypherUtil.resolveRelationships(cypherIn);
  Matcher m = ENTAILMENT_PATTERN.matcher(cypherOut);
  while (m.find()) {
    String types = m.group(2);
    String[] cypherRels = types.split("\\|");
    for (String cypherRel : cypherRels) {
      String unquotedCypherRel = cypherRel.replaceAll("^`|`$","");
      RelationshipType relType = RelationshipType.withName(unquotedCypherRel);
      DirectedRelationshipType dirRelType = new DirectedRelationshipType(relType, Direction.OUTGOING);
      rels.add(dirRelType);
    }
  }
  return rels;
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
@Procedure(value = "graph.versioner.diff.from.current", mode = DEFAULT)
@Description("graph.versioner.diff.from.current(state) - Get a list of differences that must be applied to the given state in order to become the current entity state")
public Stream<DiffOutput> diffFromCurrent(
		@Name("state") Node state) {

	Optional<Node> currentState = Optional.ofNullable(state.getSingleRelationship(RelationshipType.withName(Utility.HAS_STATE_TYPE), Direction.INCOMING))
			.map(Relationship::getStartNode).map(entity -> entity.getSingleRelationship(RelationshipType.withName(Utility.CURRENT_TYPE), Direction.OUTGOING))
			.map(Relationship::getEndNode);

	Stream<DiffOutput> result = Stream.empty();

	if(currentState.isPresent() && !currentState.equals(Optional.of(state))){
		result = diffBetweenStates(Optional.of(state), currentState);
	}

	return result;
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
private void fromTextToJira(){
	Map<String, Node> jiraMap=new HashMap<>();
	try (Transaction tx = db.beginTx()) {
		for (Node node:db.getAllNodes()){
			if (node.hasLabel(Label.label(JiraExtractor.ISSUE))){
				String name=(String) node.getProperty(JiraExtractor.ISSUE_NAME);
				jiraMap.put(name, node);
			}
		}
		tx.success();
	}
	try (Transaction tx = db.beginTx()) {
        for (Node srcNode : textNodes) {
            String content = text(srcNode);
            Set<String> tokenSet=new HashSet<>();
            for (String e:content.split("[^A-Za-z0-9\\-_]+"))
            	tokenSet.add(e);
            for (String jiraName:jiraMap.keySet()){
            	if (tokenSet.contains(jiraName))
            		srcNode.createRelationshipTo(jiraMap.get(jiraName), RelationshipType.withName(REFERENCE));
            }
        }
        tx.success();
	}
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
public void run(GraphDatabaseService db) {
    this.db = db;
    MboxHandler myHandler = new MboxHandler();
    myHandler.setDb(db);
    MimeConfig config=new MimeConfig();
    config.setMaxLineLen(-1);
    parser = new MimeStreamParser(config);
    parser.setContentHandler(myHandler);
    parse(new File(mboxPath));
    try (Transaction tx = db.beginTx()) {
        for (String address : myHandler.getMailUserNameMap().keySet()) {
            Node node = myHandler.getMailUserMap().get(address);
            node.setProperty(MAILUSER_NAMES, String.join(", ", myHandler.getMailUserNameMap().get(address)));
        }
        tx.success();
    }
    try (Transaction tx = db.beginTx()) {
        for (String mailId : myHandler.getMailReplyMap().keySet()) {
            Node mailNode = myHandler.getMailMap().get(mailId);
            Node replyNode = myHandler.getMailMap().get(myHandler.getMailReplyMap().get(mailId));
            if (mailNode != null & replyNode != null)
                mailNode.createRelationshipTo(replyNode, RelationshipType.withName(MailListExtractor.MAIL_IN_REPLY_TO));
        }
        tx.success();
    }
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
private void createUserNode(Node mailNode, String userName, String userAddress, boolean sender) {
    Node userNode;
    if (!mailUserMap.containsKey(userAddress)) {
        userNode = db.createNode();
        userNode.addLabel(Label.label(MailListExtractor.MAILUSER));
        userNode.setProperty(MailListExtractor.MAILUSER_MAIL, userAddress);
        mailUserMap.put(userAddress, userNode);
    }
    userNode = mailUserMap.get(userAddress);
    if (!mailUserNameMap.containsKey(userAddress))
        mailUserNameMap.put(userAddress, new HashSet<>());
    mailUserNameMap.get(userAddress).add(userName);
    if (sender)
        mailNode.createRelationshipTo(userNode, RelationshipType.withName(MailListExtractor.MAIL_SENDER));
    else
        mailNode.createRelationshipTo(userNode, RelationshipType.withName(MailListExtractor.MAIL_RECEIVER));

}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
@Override
public <R, E extends Throwable> R accept(Visitor<R, E> visitor) throws E {
    for (Node node : dbServices.getAllNodes()) {
        if (node.hasLabel(Label.label("CompilationUnit"))) {
            continue;
        }
        if (node.hasLabel(Label.label("SourceSpan"))) {
            continue;
        }
        if (node.hasLabel(Label.label("SourceLocation"))) {
            continue;
        }

        visitor.visitNode(node);
        for (Relationship edge : node.getRelationships(Direction.OUTGOING)) {
            if (edge.isType(RelationshipType.withName("location"))) {
                continue;
            }
            visitor.visitRelationship(edge);
        }
    }
    return visitor.done();
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
public final Relationship add(RelationshipType type, Node tail, Node head, double prob) {
	if (null == type)
		throw new IllegalArgumentException("Illegal 'type' argument in Problem.add(RelationshipType, Node, Node, double): " + type);
	if (null == tail)
		throw new IllegalArgumentException("Illegal 'tail' argument in Problem.add(RelationshipType, Node, Node, double): " + tail);
	if (null == head)
		throw new IllegalArgumentException("Illegal 'head' argument in Problem.add(RelationshipType, Node, Node, double): " + head);
	if (prob < 0.0 || prob > 1.0)
		throw new IllegalArgumentException("Illegal 'prob' argument in Problem.add(RelationshipType, Node, Node, double): " + prob);
	Relationship result = null;
	try (Transaction tx = graph.beginTx()) {
		result = tail.createRelationshipTo(head, type);
		result.setProperty("prob", prob);
		count += 1;
		tx.success();
	}
	return result;
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
@Test
public void shouldNotSeeDeletedRelationshipWhenQueryingWithStartAndEndNode()
{
    // GIVEN
    RelationshipIndex index = relationshipIndex( EXACT_CONFIG );
    Node start = graphDb.createNode();
    Node end = graphDb.createNode();
    RelationshipType type = withName( "REL" );
    Relationship rel = start.createRelationshipTo( end, type );
    index.add( rel, "Type", type.name() );
    finishTx( true );
    beginTx();

    // WHEN
    IndexHits<Relationship> hits = index.get( "Type", type.name(), start, end );
    assertEquals( 1, count( (Iterator<Relationship>)hits ) );
    assertEquals( 1, hits.size() );
    index.remove( rel );

    // THEN
    hits = index.get( "Type", type.name(), start, end );
    assertEquals( 0, count( (Iterator<Relationship>)hits ) );
    assertEquals( 0, hits.size() );
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
/**
 * 
 * @param properties
 * @param labels
 * @return
 */
public static long createRelationship(long startNodeId, long endNodeId, RelationshipType relationshipType, Map<String, Object> properties)
{
  GraphDatabaseService graphDatabaseService = getGraphDatabaseService();

  Node startNode = graphDatabaseService.getNodeById(startNodeId);
  Node endNode = graphDatabaseService.getNodeById(endNodeId);

  Relationship relationship = startNode.createRelationshipTo(endNode, relationshipType);

  for (String key : properties.keySet())
  {
    relationship.setProperty(key, properties.get(key));
  }

  return relationship.getId();
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
public static Iterable<Node> getAdjacentNodes(final Node sourceNode, final RelationshipType relationshipType, final Direction direction, final Label targetNodeLabel) {
	final Collection<Node> nodes = new ArrayList<>();
	
	final Iterable<Relationship> relationships = sourceNode.getRelationships(relationshipType, direction);
	for (final Relationship relationship : relationships) {
		final Node candidate;
		switch (direction) {
		case INCOMING:
			candidate = relationship.getStartNode();
			break;
		case OUTGOING:
			candidate = relationship.getEndNode();			
			break;
		default:
			throw new UnsupportedOperationException("Direction: " + direction + " not supported.");
		}
		if (!candidate.hasLabel(targetNodeLabel)) {
			continue;
		}
		nodes.add(candidate);
	}
	return nodes;
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
/**
 * Finds relationship of given type between subject and object nodes.
 * 
 * @return Relationship if exists or null.
 */
public Relationship get(Node subject, RelationshipType type, Node object) {
	try {
		// FIXME Use relationship index instead of iterating over all relationships
		Iterable<Relationship> relations = subject.getRelationships(Direction.OUTGOING, type);
		for(Relationship relation: relations) {
			org.neo4j.graphdb.Node target = relation.getEndNode();
			// Match object with target node in the existing triple
			Iterable<Label> labels = object.getLabels();
			for(Label label:labels) {
				if(label.name().equals(NeoGraph.LABEL_LITERAL)) {
					// Match literal value of object and target in existing triple
					if(object.getProperty(NeoGraph.PROPERTY_VALUE).equals(target.getProperty(NeoGraph.PROPERTY_VALUE)))
						return relation;
					else return null;
				}
			}
			// Now match URI of object and target in existing triple
			// FIXME Blank Nodes?
			if(object.getProperty(NeoGraph.PROPERTY_URI).equals(target.getProperty(NeoGraph.PROPERTY_URI)))
				return relation;
		}
	} catch(RuntimeException exception) { }
	return null;
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
@Override
public long createRelationship(long start, long end, RelationshipType type) {
  Optional<Long> relationshipId = getRelationship(start, end, type);

  if (relationshipId.isPresent()) {
    return relationshipId.get();
  } else {
    try (Transaction tx = graphDb.beginTx()) {
      Node startNode = graphDb.getNodeById(start);
      Node endNode = graphDb.getNodeById(end);
      Relationship relationship;
      synchronized (graphLock) {
        relationship = startNode.createRelationshipTo(endNode, type);
        relationshipMap.put(start, end, type, relationship.getId());
      }
      tx.success();
      return relationship.getId();
    }
  }
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
@Override
public Collection<Long> createRelationshipsPairwise(Collection<Long> nodeIds,
    RelationshipType type) {
  Set<Long> relationships = new HashSet<>();
  for (Long start : nodeIds) {
    for (Long end : nodeIds) {
      if (start.equals(end)) {
        continue;
      } else {
        if (!getRelationship(end, start, type).isPresent()) {
          relationships.add(createRelationship(start, end, type));
        }
      }
    }
  }
  return relationships;
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
@Override
public Collection<Long> createRelationshipsPairwise(Collection<Long> nodes, RelationshipType type) {
  Set<Long> relationships = new HashSet<>();
  for (Long start : nodes) {
    for (Long end : nodes) {
      if (start.equals(end)) {
        continue;
      } else {
        synchronized (graphLock) {
          if (!getRelationship(end, start, type).isPresent()) {
            relationships.add(createRelationship(start, end, type));
          }
        }
      }
    }
  }
  return relationships;
}
 

import org.neo4j.graphdb.RelationshipType; //導入依賴的package包/類
long processCategory(Node root, RelationshipType type, Direction direction, String category) {
  long count = 0;
  int batchSize = 100_000;
  Label label = Label.label(category);
  Transaction tx = graphDb.beginTx();
  for (Path position : graphDb.traversalDescription().uniqueness(Uniqueness.NODE_GLOBAL)
      .depthFirst().relationships(type, direction)
      .relationships(OwlRelationships.RDF_TYPE, Direction.INCOMING)
      .relationships(OwlRelationships.OWL_EQUIVALENT_CLASS, Direction.BOTH).traverse(root)) {
    Node end = position.endNode();
    GraphUtil.addProperty(end, Concept.CATEGORY, category);
    end.addLabel(label);
    if (0 == ++count % batchSize) {
      logger.fine("Commiting " + count);
      tx.success();
      tx.close();
      tx = graphDb.beginTx();
    }
  }
  tx.success();
  tx.close();
  return count;
}