Use your own Array Expander:
RelationshipType[][] orderedRelTypes = {
{ Relations.FRIENDS, Relations.ENEMIES },
{ Relations.LIKES },
{ Relations.HATES}
};
Direction[] directions = {Direction.OUTGOING,
Direction.INCOMING, Direction.INCOMING} ;
Traverser traverser = Traversal.description()
.depthFirst()
.expand(new ArrayExpander(directions,orderedRelTypes))
.evaluator(Evaluators.atDepth(3))
.uniqueness(Uniqueness.NONE)
.traverse(person);
public class ArrayExpander implements PathExpander {
private Direction[] directions;
private RelationshipType[][] types;
public ArrayExpander(Direction[] directions, RelationshipType[][] types
)
{
this.types = types;
this.directions = directions;
}
public Iterable<Relationship> expand(Path path, BranchState state){
return path.endNode().getRelationships(directions[path.length()],
types[path.length()]);
}
public ArrayExpander reverse()
{
return new ArrayExpander(directions, types);
}
}
On Saturday, January 25, 2014 12:26:49 PM UTC-6, Javad Karabi wrote:
>
> but now, i am seeing that it does traverse
> ()-[:preferred_store]->()<-[:preferred_store]-()
> but, i am seeing that it _again_ traverses out via preferred_store:
>
> (0)--[preferred_store,10]-->(11)<--[preferred_store,3517594]--(90746)--[preferred_store,3517600]-->(19758)
>
>
> even though my expander looks as such:
> PathExpander e = (new org.neo4j.kernel.OrderedByTypeExpander())
> .add( Rels.preferred_store, Direction.OUTGOING )
> .add( Rels.preferred_store, Direction.INCOMING )
> .add( Rels.ordered, Direction.OUTGOING )
> ;
>
> should this not match only
> ()-[:preferred_store]->()<-[:preferred_store]-()-[:ordered]->()
> ?
>
>
>
> On Sat, Jan 25, 2014 at 12:22 PM, Javad Karabi
> <[email protected]<javascript:>
> > wrote:
>
>> scratch that, i forgot to import it...
>>
>>
>> On Sat, Jan 25, 2014 at 12:13 PM, Javad Karabi
>> <[email protected]<javascript:>
>> > wrote:
>>
>>> it does not seem to work for me
>>>
>>> error: cannot find symbol
>>> asList(
>>> ^
>>> symbol: method asList(Pair<Rels,Direction>)
>>>
>>>
>>>
>>> On Saturday, January 25, 2014 6:59:20 AM UTC-6, Stefan Armbruster wrote:
>>>
>>>> Arrays.asList from the JDK,
>>>> http://docs.oracle.com/javase/7/docs/api/java/util/Arrays.
>>>> html#asList(T...)
>>>>
>>>> 2014/1/25 Javad Karabi <[email protected]>:
>>>> > the asList can not seem to be found... where is that provided?
>>>> >
>>>> >
>>>> > On Friday, January 24, 2014 7:21:37 PM UTC-6, Michael Hunger wrote:
>>>> >>
>>>> >> I think you have to create a custom RelationshipExpander, that takes
>>>> a
>>>> >> list of pairs of type and direction and checks at the current path
>>>> length
>>>> >> for the correct combo to look for.
>>>> >>
>>>> >> I think from a quick look that org.neo4j.kernel.OrderedByTypeExpander
>>>>
>>>> >> already does this btw. Please check.
>>>> >>
>>>> >> new
>>>> >> OrderedByTypeExpander(asList(Pair.of(DynamicRelationshipType.withName("preferred_store"),
>>>> >>
>>>>
>>>> >> Direction.OUTGOING),Pair.of(
>>>> >> DynamicRelationshipType.withName("preferred_store"),
>>>> Direction.INCOMING),
>>>> >> ....)
>>>> >>
>>>> >> Michael
>>>> >>
>>>> >>
>>>> >> On Fri, Jan 24, 2014 at 10:21 PM, Javad Karabi <[email protected]>
>>>> wrote:
>>>> >>>
>>>> >>> How would i use the traversal description to do the following?
>>>> >>>
>>>> >>> MATCH
>>>> >>> me-[:preferred_store]->(:Store)<-[:preferred_store]-(:
>>>> Member)-[:ordered]->(p:Product)
>>>> >>>
>>>> >>> I assumed that the following worked:
>>>> >>> .relationships(
>>>> >>> DynamicRelationshipType.withName("preferred_store"),
>>>> Direction.OUTGOING )
>>>> >>> .relationships(
>>>> >>> DynamicRelationshipType.withName("preferred_store"),
>>>> Direction.INCOMING )
>>>> >>> .relationships( DynamicRelationshipType.withName("ordered"),
>>>>
>>>> >>> Direction.OUTGOING )
>>>> >>> .relationships( DynamicRelationshipType.withName("product"),
>>>>
>>>> >>> Direction.OUTGOING )
>>>> >>>
>>>> >>> However, I am seeing that the order in which relationships() is
>>>> executed
>>>> >>> does not make a difference, it just adds the relationships to a
>>>> global list
>>>> >>> of allowed relationships for the description... how would i ensure
>>>> that the
>>>> >>> traversal only goes from preferred store, to ordered, to the
>>>> product?
>>>> >>>
>>>> >>> --
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>>>> >>
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>>
>>
>
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