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

      break;
    }
  }


  private void putAssociationOperation(Association association, AssociationKey associationKey, AssociationOperation action, AssociatedEntityKeyMetadata associatedEntityKeyMetadata) {
    Relationship relationship = associationQueries.get( associationKey.getMetadata() ).findRelationship( executionEngine, associationKey, action.getKey() );


    if (relationship != null) {
      for ( String relationshipProperty : associationKey.getMetadata().getRowKeyIndexColumnNames() ) {
        relationship.setProperty( relationshipProperty, action.getValue().get( relationshipProperty ) );


      }
      GraphLogger.log( "Updated relationship: %1$s", relationship );
    }
    else {

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    }
  }


  private void putAssociationOperation(AssociationKey associationKey, AssociationOperation action) {
    RowKey rowKey = action.getKey();
    Relationship relationship = createRelationshipUnlessExists( findNode( associationKey.getEntityKey() ), associationKey, rowKey );
    applyTupleOperations( relationship.getEndNode(), action.getValue().getOperations() );
  }

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    Relationship relationship = createRelationshipUnlessExists( findNode( associationKey.getEntityKey() ), associationKey, rowKey );
    applyTupleOperations( relationship.getEndNode(), action.getValue().getOperations() );
  }


  private Relationship createRelationshipUnlessExists(Node startNode, AssociationKey associationKey, RowKey rowKey) {
    Relationship relationship = indexer.findRelationship( relationshipType( associationKey ), rowKey );
    if ( relationship == null ) {
      return createRelationship( startNode, associationKey, rowKey );
    }
    return relationship;
  }

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    return indexer.findNode( entityKey );
  }


  private void removeAssociationOperation(AssociationKey associationKey, AssociationOperation action) {
    RowKey rowKey = action.getKey();
    Relationship relationship = indexer.findRelationship( relationshipType( associationKey ), rowKey );
    removeRelationship( relationship );
  }

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    indexer.remove( entityNode );
    entityNode.delete();
  }


  private Relationship createRelationship(Node startNode, AssociationKey associationKey, RowKey rowKey) {
    Relationship relationship = startNode.createRelationshipTo( provider.createNode(), relationshipType( associationKey ) );
    for ( int i = 0; i < rowKey.getColumnNames().length; i++ ) {
      relationship.setProperty( rowKey.getColumnNames()[i], rowKey.getColumnValues()[i] );
    }
    indexer.index( relationship );
    return relationship;
  }

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    serialize( object, type, targetNode, formatVersion );
  }


  @Nonnull
  public <T> T deserializeWithRelationship( @Nonnull Class<T> type, @Nonnull RelationshipType relationshipType, @Nonnull Node node, @Nonnull Version formatVersion ) throws IOException {
    @Nullable Relationship relationship = node.getSingleRelationship( relationshipType, Direction.OUTGOING );
    assert relationship != null;
    return deserialize( type, formatVersion, relationship.getEndNode() );
  }

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        {
            throw new IllegalArgumentException( "Null movie" );
        }
        final Node actorNode = ((ActorImpl) actor).getUnderlyingNode();
        final Node movieNode = ((MovieImpl) movie).getUnderlyingNode();
        final Relationship rel = actorNode.createRelationshipTo( movieNode,
            RelTypes.ACTS_IN );
        final Role role = new RoleImpl( rel );
        if ( roleName != null )
        {
            role.setName( roleName );

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    neo4jCRUD.remove( key );
  }


  @Override
  public Tuple createTupleAssociation(AssociationKey associationKey, RowKey rowKey) {
    Relationship relationship = createRelationship( associationKey, rowKey );
    GraphLogger.log( "Relationship: %1$s", relationship );
    if ( relationship == null ) {
      // This should only happen for bidirectional associations, when we are creating the association on the owner side.
      // We can ignore the creation of the relationship in this case and we will create it when dealing with the inverese side of
      // the same association

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    }
  }


  private Relationship createRelationshipWithEmbeddedNode(AssociationKey associationKey, RowKey rowKey) {
    Node embeddedNode = neo4jCRUD.createNode( rowKey.getEntityKey(), EMBEDDED );
    Relationship relationship = createRelationshipWithTargetNode( associationKey, rowKey, embeddedNode );
    applyProperties( associationKey, rowKey, relationship );
    return relationship;
  }

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      // We have to wait the creation of the target side of the association before
      // we can obtain the targetKey
      return null;
    }


    Relationship relationship = neo4jCRUD.findRelationship( associationKey, rowKey );
    if ( relationship != null ) {
      return relationship;
    }


    Node targetNode = neo4jCRUD.findNode( targetKey, ENTITY );

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