Gremlin Query builder

[Senthil Jayakumar]

Hi There,

I'm implementing utility method which will build the query based on the input,

for e.g. the following queries were constructed

query 1:
String query = .as('x').out().out().out().out().has("objectType","com.networks.osa.dao.domain.Cloud").has("name","blr-cloud").back('x').out().out().out().out().has("objectType","com.networks.osa.dao.domain.VirtualCPUCount").property("count")

query 2:
String query = .out().out().out().out().has("objectType","com.networks.osa.dao.domain.VirtualCPUCount").property("count")

Based on the condition specified below, I need to append one of the above mentioned query with the pipe.

            if(id.equals("ServiceOrder"))
            {
                pipe = new GremlinPipeline<Vertex, Vertex>(graph.getVertices());
            }
            else
            {
                Vertex v = graph.getVertex(Long.parseLong(id));
                pipe = new GremlinPipeline<Vertex, Vertex>(v);
            }

finally, the complete query should look like, "pipe + query" and access any other method like .toList() etc. Is there a way to construct the query separately and use them like by passing the query as input to any existing method or by appending the query to pipe?

List<Object> counts = pipe + query.toList();

Appreciate your help in this regard.

Thanks,
Senthil Jayakumar

[Senthil Jayakumar]

Any help in this regard is very much appreciated. 

[Stephen Mallette]

So, you construct the queries as String values and you want to append that to a different way of starting the traversal?  Why not just construct the start of the query as a String as well?  

String queryEnd = ".out().out().out().out().has("objectType","com.networks.osa.dao.domain.VirtualCPUCount").property("count")"

String query;

if(id.equals("ServiceOrder"))
{
    query = "g.V" + queryEnd
}
else
{
    query = "g.v(1)"  + queryEnd
}

That seems really simple so I must be missing some aspect of your question.

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[Daniel Kuppitz]

Maybe the question is about pipe concatenation..?

gremlin> g = TinkerGraphFactory.createTinkerGraph()
==>tinkergraph[vertices:6 edges:6]
gremlin> g.V().out()
==>v[3]
==>v[2]
==>v[4]
==>v[3]
==>v[5]
==>v[3]
gremlin> pipeEnd = _().out(); []
gremlin> pipeStart = g.V(); []
gremlin> pipe = pipeStart.add(pipeEnd); []
gremlin> pipe.toString()
==>[GremlinStartPipe, GraphQueryPipe(vertex), [GremlinStartPipe, VertexQueryPipe(out,[],vertex)]]
gremlin> pipe
==>v[3]
==>v[2]
==>v[4]
==>v[3]
==>v[5]
==>v[3]
gremlin>

Not sure if there was a better way in TP2.

Cheers,

Daniel

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