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Message from discussion How to find something using the Java code Gremlin or Pipe
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pShah  
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 More options May 8 2012, 12:32 am
From: pShah <pranav.shah....@gmail.com>
Date: Mon, 7 May 2012 21:32:10 -0700 (PDT)
Local: Tues, May 8 2012 12:32 am
Subject: Re: [TinkerPop] How to find something using the Java code Gremlin or Pipe
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How do you specify the "filter" on "scatter"?

I tried multiple things before posting here, but I cannot solve it.

I wrote this small function which is called from inside the filter, but all
I know is the Object class, but no clue on how to work with it.

PipeFunction GetFilter = new PipeFunction<Object, Boolean>() {
            public Boolean compute(Object o) {
                System.out.println(o.getClass());
                    return false;
            }
        };

Output:  class java.util.HashMap$Entry

Almost everything I try to get the avle gives me a ClassCastException:
Exception in thread "main" java.lang.ClassCastException:
java.util.HashMap$Entry cannot be cast to java.util.Map

Please help.

On Monday, April 30, 2012 12:42:22 PM UTC-4, Marko A. Rodriguez wrote:

> Hi,

> > What I am trying to do is:

> > 1.  Find the vertices for 'marko', 'peter', and 'josh'
> > 2.  Find what they 'created' together.

> There are various ways to do this. First, lets get the vertices marko,
> peter, and josh using the default Vertex index.

> marko = g.idx(T.v)[[name:'marko']].next()
> peter = g.idx(T.v)[[name:'peter']].next()
> josh = g.idx(T.v)[[name:'josh']].next()

> -------------------------------------

> 1. No set intersection
>         * count the number of times a project is traversed too, if its
> been traversed to three times, it must have been created by all marko,
> peter, and josh.

> gremlin> [marko, peter,
> josh]._().out('created').groupCount.cap.scatter.filter{it.value ==
> 3}.transform{it.key}.name
> ==>lop

> 2. Set intersection
>         * intersect the projects that marko, josh, and peter have created
> --- note that this requires memory.

> gremlin>
> marko.out('created').toList().intersect(peter.out('created').toList()).inte rsect(josh.out('created').toList()).name

> ==>lop

> I'm sure there are other ways of attacking the problem. However, I believe
> this provides you the two extremes (data flow vs. set-based). If you come
> up with some new ways, please post them.

> Good luck,
> Marko.

> http://markorodriguez.com


 
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