Hi All,
I am sorry for my previous email, I made a mistake and chose a wrong mailing
list (neo4j instead of gremlin mailing list).
Best Regards,
Wojtek
Dnia 18 października 2011 9:59 skarab77 <skara...@o2.pl> napisał(a):
> I need a pipe, which returns a set of vertices for an input Vertex (wrapped
> in User Defined Step). I use blueprints pipes with Neo4j. My current code is:
>
> import org.junit.Test
> import com.tinkerpop.blueprints.pgm.Graph
> import com.tinkerpop.blueprints.pgm.Vertex
> import com.tinkerpop.blueprints.pgm.impls.neo4j.Neo4jVertex
> import com.tinkerpop.blueprints.pgm.impls.tg.TinkerGraphFactory
> import com.tinkerpop.gremlin.Gremlin
> import com.tinkerpop.pipes.AbstractPipe
> import com.tinkerpop.pipes.Pipe
>
> class MyUDSTest {
>
> public static class MyPipe extends AbstractPipe<Vertex, Iterable<Vertex>> {
>
> @Override
> protected Iterable<Vertex> processNextStart() throws
> NoSuchElementException {
> def v = this.starts.next();
>
> def nodes = [v, v, v].iterator;
>
> return new Iterable<Vertex>() {
> @Override
> public Iterator<Vertex> iterator() {
> return new Iterator<Vertex>() {
> @Override
> public boolean hasNext() {
> return nodes.hasNext();
> }
>
> @Override
> public Vertex next() {
> return new Neo4jVertex(nodes.next(), graph);
> }
>
> @Override
> public void remove() {
> throw new UnsupportedOperationException();
>
> }
> };
> }
> };
> }
>
> }
>
> @Test
> public void testUDS()
> {
> Gremlin.load();
> Graph g;
> Gremlin.defineStep('myPipe',[Vertex,Pipe], { new MyPipe() })
>
> g = TinkerGraphFactory.createTinkerGraph()
> println "$g"
> def result = []
> g.v(1).myPipe.filter{true} >> result
>
> result.each {
> println "$it"
> }
>
> }
>
> }
>
> However it does not work property in the gremlin expression:
>
> Gremlin.defineStep('myPipe',[Vertex,Pipe], { new MyPipe() })
> ...
> def result = [];
> g.v(1).myPipe >> result
>
> result.each
> {
> println it
> }
>
> prints out: neo4j.MyUDSTest$MyPipe$1@49aacd5f. I would expect that I will get
> a list of vertices. Could anybody help me with this pipe?
>
>
_______________________________________________
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
