Examples of org.neo4j.graphdb.Relationship

org.neo4j.graphdb.Relationship
we have: (a) --- REL_TYPE ---> (b) assert rel. {@link Relationship#getStartNode() getStartNode}().equals( a ); assert rel. {@link Relationship#getEndNode() getEndNode}().equals( b ); assert rel. {@link Relationship#getNodes() getNodes}()[0].equals( a ) && rel. {@link Relationship#getNodes() getNodes}()[1].equals( b ); Even though all relationships have a direction they are equally well traversed in both directions so there's no need to create duplicate relationships in the opposite direction (with regard to traversal or performance).
Furthermore, Neo4j guarantees that a relationship is never "hanging freely," i.e. {@link #getStartNode()}, {@link #getEndNode()}, {@link #getOtherNode(Node)} and {@link #getNodes()} are guaranteed to alwaysreturn valid, non-null nodes.
The id of a relationship is unique, but may not be unique over time since neo4j reuses deleted ids. See http://wiki.neo4j.org/content/Id_Reuse


            String wayName = null;
            OsmRelation wayRelation = null;


            for (int i = 0; i < partToMerge.size(); i++) {
                Relationship chunk = partToMerge.get(i);


                //Create Coordinate objects for the nodes. Sequence matters!
                Node startNode = chunk.getStartNode();
                Node endNode = chunk.getEndNode();


                Double startLat = (Double) startNode.getProperty(OsmEntityAttributeKey.NODE_LAT.name());
                Double startLon = (Double) startNode.getProperty(OsmEntityAttributeKey.NODE_LON.name());


                Double endLat = (Double) endNode.getProperty(OsmEntityAttributeKey.NODE_LAT.name());
                Double endLon = (Double) endNode.getProperty(OsmEntityAttributeKey.NODE_LON.name());


                coordinates.add(new Coordinate(startLon, startLat));
                coordinates.add(new Coordinate(endLon, endLat));


                //merge
                if (partToMerge.size() == 1) {
                    //TODO nothing to merge
                    continue;
                }


                if (i == 0) {
                    wayRelation = chunk.isType(OsmRelation.BIDIRECTIONAL) ? OsmRelation.BIDIRECTIONAL : OsmRelation.ONE_WAY;
                    wayName = chunk.hasProperty(OsmEntityAttributeKey.WAY_NAME.name()) ?
                            (String) chunk.getProperty(OsmEntityAttributeKey.WAY_NAME.name()) : null;


                    //Start relationship -> only start node survives
                    graphDb.index().forRelationships("ways").remove(chunk);
                    chunk.delete();


                } else {
                    graphDb.index().forRelationships("ways").remove(chunk);
                    chunk.delete();


                    graphDb.index().forNodes("nodes").remove(startNode);
                    startNode.delete();


                }
            }




            Coordinate[] coords = getCoordinates(coordinates);
            if (partToMerge.size() == 1) {
                Relationship relationship = partToMerge.get(0);
                double length = getDistanceInMeters(coords);


                relationship.setProperty(OsmEntityAttributeKey.WAY_DISTANCE.name(), length);


            } else if (partToMerge.size() > 1) {


                //Create new relationship
                Node startNode = partToMerge.get(0).getStartNode();
                Node endNode = partToMerge.get(partToMerge.size() - 1).getEndNode();
                Relationship newRelationship = startNode.createRelationshipTo(endNode, wayRelation);


                //Set relationship properties
                newRelationship.setProperty(OsmEntityAttributeKey.WAY_ID.name(), wayId);
                if (wayName != null) {
                    newRelationship.setProperty(OsmEntityAttributeKey.WAY_NAME.name(), wayName);
                }


                //Set geometry and distance
                LineString lineString = geometryFactory.createLineString(coords);


                double length = getDistanceInMeters(coords);
                String textGeometry = lineString.toText();


                newRelationship.setProperty(OsmEntityAttributeKey.WAY_DISTANCE.name(), length);
                newRelationship.setProperty(OsmEntityAttributeKey.WAY_GEOMETRY.name(), textGeometry);


                //Add to index
                graphDb.index().forRelationships("ways").add(newRelationship,
                        OsmEntityAttributeKey.WAY_ID.name(),
                        wayId);

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                for (Node node : nodes) {


                    if (prevNode != null) {


                        // According to OSM spec ONE_WAY attribution is set in the direction starting from the first node
                        Relationship wayPartRel = prevNode.createRelationshipTo(node, oneWay ? OsmRelation.ONE_WAY : OsmRelation.BIDIRECTIONAL);
                        wayPartRel.setProperty(OsmEntityAttributeKey.WAY_ID.name(), wayId);
                        //Add WAY name if exists
                        if (wayName != null && !wayName.isEmpty()) {
                            wayPartRel.setProperty(OsmEntityAttributeKey.WAY_NAME.name(), wayName);
                        }


                        //add way/relation to index
                        parent.getGraphDb().index().forRelationships("ways").add(wayPartRel,
                                OsmEntityAttributeKey.WAY_ID.name(),

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    public Node getStartNode(Long wayId) {


        IndexHits<Relationship> ways = db.index().forRelationships("ways").get(OsmEntityAttributeKey.WAY_ID.name(), wayId);
        while (ways.hasNext()) {
            Relationship relationship = ways.next();
            Iterator<Relationship> incoming = relationship.getStartNode().getRelationships(Direction.INCOMING).iterator();


            boolean isStartNode = true;
            while (incoming.hasNext()) {
                Relationship incomingRel = incoming.next();
                Long incomingWayId = (Long) incomingRel.getProperty(OsmEntityAttributeKey.WAY_ID.name());
                if (wayId.equals(incomingWayId)) {
                    isStartNode = false;
                    break;
                }
            }

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        Node startNodeCandidate = null;
        boolean isRoundabout = false;


        IndexHits<Relationship> ways = db.index().forRelationships("ways").get(OsmEntityAttributeKey.WAY_ID.name(), wayId);
        while (ways.hasNext()) {
            Relationship relationship = ways.next();


            Node startNode = relationship.getStartNode();
            Node endNode = relationship.getEndNode();


            Long startNodeId = (Long) startNode.getProperty(OsmEntityAttributeKey.NODE_ID.name());
            Long endNodeId = (Long) endNode.getProperty(OsmEntityAttributeKey.NODE_ID.name());


            //put start\end nodes in cache

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    Node memberB = createNode(graphDatabase, "Tony");
    Node memberC = createNode(graphDatabase, "Guillaume");
    Node memberD = createNode(graphDatabase, "Sebastien");
    // Link nodes between them by adding relationships
    // ---Relationship owned by the MemberA node
    Relationship r01 = createRelationship(graphDatabase, memberA, memberB, SocialNetworkRelationship.FRIEND);
    Relationship r02 = createRelationship(graphDatabase, memberA, memberC, SocialNetworkRelationship.TEAMMATE);
    // ---Relationship owned by the MemberB node
    Relationship r03 = createRelationship(graphDatabase, memberB, memberC, SocialNetworkRelationship.TEAMMATE);
    // ---Relationship owned by the MemberC node
    Relationship r04 = createRelationship(graphDatabase, memberC, memberB, SocialNetworkRelationship.FRIEND);
    // ---Relationship owned by the MemberD node
    Relationship r05 = createRelationship(graphDatabase, memberD, memberC, SocialNetworkRelationship.FRIEND);
    // Display relationship created above
    System.out.println("*** MEMBERS RELATIONSHIPS CREATED ***");
    displayRelationship(r01);
    displayRelationship(r02);
    displayRelationship(r03);

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   *        Type of the relationship
   * @return a object representing the relationship
   * @throws Exception
   */
  private static Relationship createRelationship(GraphDatabaseService graphDb, Node ownerNode, Node counterpartNode, RelationshipType relationshipType) throws Exception {
    Relationship newRelationship = null;
    // Create and start a new transaction
    Transaction tx = graphDb.beginTx();
    try {
      // First check if the relationship do not already exists
      Iterator<Relationship> relationships = ownerNode.getRelationships(relationshipType, Direction.OUTGOING).iterator();
      while (relationships.hasNext()) {
        Relationship r = relationships.next();
        if (r.getEndNode().getProperty("MemberName").equals(counterpartNode.getProperty("MemberName"))) {
          newRelationship = r;
          break;
        }
      }
      // Seconds try only to the create a new relationship from the

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        when(fromNode.getId()).thenReturn(0l);
        
        Node toNode = mock(Node.class);
        when(toNode.getId()).thenReturn(1l);
        
        Relationship mockRel = mock(Relationship.class);
        when(mockRel.getId()).thenReturn(0l);
        when(mockRel.getType()).thenReturn(DynamicRelationshipType.withName("LOVES"));
        when(mockRel.getStartNode()).thenReturn(fromNode);
        when(mockRel.getEndNode()).thenReturn(toNode);
        
        when(mockRel.getPropertyKeys()).thenReturn(Collections.<String> emptyList());
        
        RelationshipSerializationStrategy strategy = new RelationshipSerializationStrategy();
        strategy.serialize(mockRel, serializer);
        serializer.flush();

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        when(fromNode.getId()).thenReturn(0l);
        
        Node toNode = mock(Node.class);
        when(toNode.getId()).thenReturn(1l);
        
        Relationship mockRel = mock(Relationship.class);
        when(mockRel.getId()).thenReturn(0l);
        when(mockRel.getType()).thenReturn(DynamicRelationshipType.withName("LOVES"));
        when(mockRel.getStartNode()).thenReturn(fromNode);
        when(mockRel.getEndNode()).thenReturn(toNode);
        
        when(mockRel.getPropertyKeys()).thenReturn(new ArrayList<String>() {
            private static final long serialVersionUID = 1248180220593789023L;
        {
            add("name");
            add("age");
            add("favorite_numbers");
        }});
        
        when(mockRel.getProperty("name")).thenReturn("bob");
        when(mockRel.getProperty("age")).thenReturn(12);
        when(mockRel.getProperty("favorite_numbers")).thenReturn(new int [] {1,2,3});
        
        RelationshipSerializationStrategy strategy = new RelationshipSerializationStrategy();
        strategy.serialize(mockRel, serializer);
        serializer.flush();

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        RelationshipCreationDescription relToCreate = invocation.getContent();
        
        Node from = db.getNodeById(getNodeId(invocation));
        Node to   = db.getNodeById(relToCreate.getEndNodeId());
        
        Relationship rel = from.createRelationshipTo(to, relToCreate.getType());
        setProperties(rel, relToCreate);
        
        result.createdAt(url.reverse(rel), rel);
    }

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    @Path(UrlReverseLookerUpper.PATH_RELATIONSHIP_PROPERTIES)
    @DeserializeWith(PropertyContainerDeserializationStrategy.class)
    public void setAllRelationshipProperties(Invocation invocation,
            Output result) throws Exception
    {
        Relationship rel = invocation.getDB().getRelationshipById(getRelationshipId(invocation));
        removeAllProperties(rel);
        setProperties(rel, invocation.<PropertyContainerDeserialization>getContent());
        result.okNoContent();
    }

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