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

  }


  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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      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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        }
        if (value instanceof Node) {
            return value.toString() + props((PropertyContainer) value);
        }
        if (value instanceof Relationship) {
            Relationship rel = (Relationship) value;
            return ":" + rel.getType().name() + "[" + rel.getId() + "] " + props(rel);
        }
        if (value instanceof Iterable) {
            return formatIterator(((Iterable) value).iterator());
        }
        if (value.getClass().isArray()) {

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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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        keyColumnValues.toArray( new Object[keyColumnValues.size()] ) );
  }


  private Relationship deleteTempNodeAndUpdateRelationshipWithEntity(AssociationKey associationKey, RowKey rowKey, Node rowKeyNode) {
    Node ownerNode = neo4jCRUD.findNode( associationKey.getEntityKey(), ENTITY );
    Relationship inverseRelationship = updateInverseRelationship( rowKey, rowKeyNode, ownerNode );


    RelationshipType associationType = relationshipType( associationKey );
    Relationship relationship = null;
    if ( !associationKey.getCollectionRole().equals( associationKey.getTable() ) ) {
      relationship = ownerNode.createRelationshipTo( inverseRelationship.getStartNode(), associationType );
      applyColumnValues( rowKey, relationship );
    }
    return relationship;

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    }
    return relationship;
  }


  private Relationship updateInverseRelationship(RowKey rowKey, Node rowKeyNode, Node ownerNode) {
    Relationship inverseRelationship = rowKeyNode.getRelationships( Direction.INCOMING ).iterator().next();
    Relationship newInverseRelationship = inverseRelationship.getStartNode().createRelationshipTo( ownerNode, inverseRelationship.getType() );
    applyColumnValues( rowKey, newInverseRelationship );
    inverseRelationship.delete();
    inverseRelationship.getEndNode().delete();
    return newInverseRelationship;
  }

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  }


  private PropertyContainer createRelationshipWithEntity(AssociationKey associationKey, RowKey rowKey, Node node) {
    EntityKey ownerEntityKey = associationKey.getEntityKey();
    Node ownerNode = neo4jCRUD.findNode( ownerEntityKey, 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() );
    applyTupleOperations( relationship, action.getValue().getOperations() );
  }

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  }


  private Relationship deleteTempNodeAndCreateRelationshipWithEntity(AssociationKey associationKey, RowKey rowKey, Node tempNode) {
    Node ownerNode = neo4jCRUD.findNode( associationKey.getEntityKey(), ENTITY );
    Iterator<Relationship> iterator = tempNode.getRelationships( Direction.INCOMING ).iterator();
    Relationship tempRelationship = iterator.next();
    Relationship relationship = ownerNode.createRelationshipTo( tempRelationship.getStartNode(), relationshipType( associationKey ) );
    applyColumnValues( rowKey, relationship );
    tempRelationship.delete();
    tempNode.delete();
    return relationship;
  }

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