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

    return relationship;
  }


  private PropertyContainer createRelationshipWithEntity(AssociationKey associationKey, RowKey rowKey, Node node) {
    Node ownerNode = neo4jCRUD.findNode( associationKey.getEntityKey(), ENTITY );
    Relationship relationship = ownerNode.createRelationshipTo( node, relationshipType( associationKey ) );
    applyColumnValues( rowKey, relationship );
    return relationship;
  }

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      break;
    }
  }


  private void putAssociationOperation(AssociationKey associationKey, AssociationOperation action) {
    Relationship relationship = neo4jCRUD.findRelationship( associationKey, action.getKey() );
    if ( relationship != null ) {
      applyTupleOperations( relationship, action.getValue().getOperations() );
    }
  }

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    query.append( " - " );
    query.append( relationshipCypher( associationKey, rowKey, parameters, entityKey.getColumnNames().length ) );
    query.append( " - () RETURN r" );
    ExecutionResult result = engine.execute( query.toString(), parameters );
    ResourceIterator<Relationship> column = result.columnAs( "r" );
    Relationship relationship = null;
    if ( column.hasNext() ) {
      relationship = column.next();
    }
    column.close();
    return relationship;

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        UniqueFactory<Relationship> factory = new UniqueFactory.UniqueRelationshipFactory(graph, PROP_INDEX_REL) {


            @Override
            protected Relationship create(Map<String, Object> properties) {
                Relationship rel = source.createRelationshipTo(target, type);
                rel.setProperty(PROP_ID, properties.get(PROP_ID));
                return rel;
            }


            @Override
            protected void initialize(Relationship rel, Map<String, Object> properties) {
                rel.setProperty(PROP_CREATED, System.currentTimeMillis());
            }
        };
        return factory.getOrCreate(PROP_ID, key);
    }

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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++ ) {
      Object value = rowKey.getColumnValues()[i];
      if ( value != null ) {
        relationship.setProperty( rowKey.getColumnNames()[i], value );
      }
    }
    indexer.index( relationship );
    return relationship;
  }

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  }


  private Relationship createRelationshipWithEmbeddedNode(AssociationKey associationKey, Tuple associationRow, AssociatedEntityKeyMetadata associatedEntityKeyMetadata) {
    EntityKey entityKey = getEntityKey( associationRow, associatedEntityKeyMetadata );
    Node embeddedNode = entityQueries.get( entityKey.getMetadata() ).createEmbedded( executionEngine, entityKey.getColumnValues() );
    Relationship relationship = createRelationshipWithTargetNode( associationKey, associationRow, embeddedNode );
    applyProperties( associationKey, associationRow, relationship );
    return relationship;
  }

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  }


  private Relationship createRelationshipWithTargetNode(AssociationKey associationKey, Tuple associationRow, Node targetNode) {
    EntityKey entityKey = associationKey.getEntityKey();
    Node ownerNode = entityQueries.get( entityKey.getMetadata() ).findEntity( executionEngine, entityKey.getColumnValues() );
    Relationship relationship = ownerNode.createRelationshipTo( targetNode, withName( associationKey.getMetadata().getCollectionRole() ) );
    applyProperties( associationKey, associationRow, relationship );
    return relationship;
  }

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