Examples of org.neo4j.graphdb.traversal.TraversalDescription

org.neo4j.graphdb.traversal.TraversalDescription
Represents a description of a traversal. This interface describes the rules and behavior of a traversal. A traversal description is immutable and each method which adds or modifies the behavior returns a new instances that includes the new modification, leaving the instance which returns the new instance intact. For instance,
```
 TraversalDescription td = new TraversalDescriptionImpl(); td.depthFirst(); 
```
is not going to modify td. you will need to reassign td, like
```
 td = td.depthFirst(); 
```
When all the rules and behaviors have been described the traversal is started by using {@link #traverse(Node)} where a starting node is supplied. The{@link Traverser} that is returned is then used to step through the graph,and return the positions that matches the rules.

                        assertTrue(transactionData.mutationsOccurred());


                        Map<Long, Change<Relationship>> changed = changesToMap(transactionData.getAllChangedRelationships());
                        Relationship current = changed.entrySet().iterator().next().getValue().getCurrent();


                        TraversalDescription traversalDescription = new MonoDirectionalTraversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL);


                        assertEquals(4, count(traversalDescription.traverse(current.getEndNode()).nodes()));
                    }
                }
        );
    }

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                        Map<Long, Change<Node>> changed = changesToMap(transactionData.getAllChangedNodes());


                        Node previous = changed.get(1L).getPrevious();


                        TraversalDescription traversalDescription = new MonoDirectionalTraversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL)
                                .evaluator(Evaluators.toDepth(3));


                        assertEquals(4, count(traversalDescription.traverse(previous).nodes()));
                    }
                }
        );
    }

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                        assertTrue(transactionData.mutationsOccurred());


                        Map<Long, Change<Node>> changed = changesToMap(transactionData.getAllChangedNodes());
                        Node current = changed.get(1L).getCurrent();


                        TraversalDescription traversalDescription = new MonoDirectionalTraversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL);


                        assertEquals(4, count(traversalDescription.traverse(current).nodes()));


                    }
                }
        );
    }

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                    public void doBeforeCommit(ImprovedTransactionData transactionData) {
                        assertTrue(transactionData.mutationsOccurred());


                        Relationship previous = transactionData.getChanged(database.getRelationshipById(changedRelId.get())).getPrevious();


                        TraversalDescription traversalDescription = database.traversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .relationships(withName("R3"), INCOMING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL)
                                .evaluator(Evaluators.toDepth(3));


                        assertEquals(4, count(traversalDescription.traverse(previous.getEndNode()).nodes()));
                    }
                }
        );
    }

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                    public void doBeforeCommit(ImprovedTransactionData transactionData) {
                        assertTrue(transactionData.mutationsOccurred());


                        Relationship current = transactionData.getChanged(database.getRelationshipById(changedRelId.get())).getCurrent();


                        TraversalDescription traversalDescription = database.traversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .relationships(withName("R3"), INCOMING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL);


                        assertEquals(3, count(traversalDescription.traverse(current.getEndNode()).nodes()));
                    }
                }
        );
    }

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                    public void doBeforeCommit(ImprovedTransactionData transactionData) {
                        assertTrue(transactionData.mutationsOccurred());


                        Relationship deletedRel = transactionData.getDeleted(database.getRelationshipById(deletedRelId.get()));


                        TraversalDescription traversalDescription = database.traversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .relationships(withName("R3"), INCOMING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL)
                                .evaluator(Evaluators.toDepth(3));


                        assertEquals(4, count(traversalDescription.traverse(deletedRel.getStartNode()).nodes()));
                    }
                }
        );
    }

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                        Map<Long, Change<Node>> changed = changesToMap(transactionData.getAllChangedNodes());


                        Node previous = changed.get(1L).getPrevious();


                        TraversalDescription traversalDescription = database.traversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .relationships(withName("R3"), INCOMING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL)
                                .evaluator(Evaluators.toDepth(3));


                        assertEquals(4, count(traversalDescription.traverse(previous).nodes()));
                    }
                }
        );
    }

View Full Code Here

                        assertTrue(transactionData.mutationsOccurred());


                        Map<Long, Change<Node>> changed = changesToMap(transactionData.getAllChangedNodes());
                        Node current = changed.get(1L).getCurrent();


                        TraversalDescription traversalDescription = database.traversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .relationships(withName("R3"), INCOMING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL);


                        assertEquals(3, count(traversalDescription.traverse(current).nodes()));


                    }
                }
        );
    }

View Full Code Here

                        Map<Long, Node> deletedNodes = propertyContainersToMap(transactionData.getAllDeletedNodes());
                        Node deleted = deletedNodes.get(2L);


                        Node one = transactionData.getDeleted(deleted).getSingleRelationship(withName("R1"), INCOMING).getStartNode();


                        TraversalDescription traversalDescription = database.traversalDescription()
                                .relationships(withName("R1"), OUTGOING)
                                .relationships(withName("R2"), OUTGOING)
                                .relationships(withName("R3"), INCOMING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL)
                                .evaluator(Evaluators.toDepth(3));


                        assertEquals(4, count(traversalDescription.traverse(one).nodes()));
                    }
                }
        );
    }

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                    public void doBeforeCommit(ImprovedTransactionData td) {
                        Map<Long, Relationship> deleted = toMap(td.getAllDeletedRelationships());
                        long r4Id = changesToMap(td.getAllChangedNodes()).get(3L).getPrevious().getSingleRelationship(R3, INCOMING).getId();
                        Relationship deletedRel = td.getDeleted(deleted.get(r4Id));


                        TraversalDescription traversalDescription = db.traversalDescription()
                                .relationships(R1, OUTGOING)
                                .relationships(R2, OUTGOING)
                                .depthFirst()
                                .uniqueness(Uniqueness.NODE_GLOBAL)
                                .evaluator(Evaluators.toDepth(3));


                        assertEquals(4, count(traversalDescription.traverse(deletedRel.getStartNode()).nodes()));
                    }
                }
        );
    }

View Full Code Here

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