Hi again,
I solved the problem myself with help of andy's previous reply.
I just needed some patients. Sorry for inconvenience.
In case if it helps for some one around this group here is the code
----------------------------------------------------------------------------------------------------------
Var v1 = Var.alloc("instance");
Expr ev1 = new ExprVar(v1);
Var v2 = Var.alloc("fpredicate");
Expr pre = new ExprVar(v2);
Var v3 = Var.alloc("object");
Expr ev3 = new ExprVar(v3);
Var v4 = Var.alloc("otype");
Var v5 = Var.alloc("coverage");
Var v6 = Var.alloc("ficount");
Var v7 = Var.alloc("focount");
Triple t1 = new
Triple(v1.asNode(),RDF.type.asNode(),NodeValue.makeNodeString("<http://data.linkedmdb.org/resource/movie/film>").asNode());
Triple t2 = new Triple(v1.asNode(), v2.asNode(), v3.asNode());
BasicPattern bp1 = new BasicPattern();
bp1.add(t1);
bp1.add(t2);
Op op = new OpBGP(bp1);
Expr str = new E_Str(pre);
E_Regex reex = new E_Regex(str, "http://data.linkedmdb.org/resource/";, "i");
op = OpFilter.filter(reex, op);
VarExprList exl = new VarExprList();
exl.add(v2);
ExprList el1 = new ExprList();
el1.add(ev3);
Expr exf1 = new E_Function("java:facet.ifuri", el1);
exl.add(v4, exf1);
Aggregator agg1 = new AggCountVarDistinct(ev1);
Aggregator agg2 = new AggCountVarDistinct(ev3);
ExprAggregator eagg1 = new ExprAggregator(v6, agg1);
ExprAggregator eagg2 = new ExprAggregator(v7, agg2);
List<ExprAggregator> aggrelist = new ArrayList<ExprAggregator>();
aggrelist.add(eagg1);
aggrelist.add(eagg2);
op =new OpGroup(op,exl, aggrelist);
ExprList el2 = new ExprList();
el2.add(eagg1);
el2.add(eagg2);
Expr v = NodeValue.makeNodeString("85620");
el2.add(v);
Expr exf2 = new E_Function("java:facet.weights3", el2);
VarExprList var = new VarExprList();
var.add(v2);
var.add(v5, exf2);
var.add(v6,agg1.getExpr());
var.add(v7, agg2.getExpr());
var.add(v4);
op = new OpProject(op, var.getVars());
op.output(new IndentedWriter(System.out));
System.out.println("\n\n\n");
Query query = OpAsQuery.asQuery(op);
query.serialize(new IndentedWriter(System.out,true)) ;
--------------------------------------------------------------------------------------------------------------------------------
Regards,
ajaz
________________________________
From: ajaz shaik <[email protected]>
To: Jena incubator <[email protected]>
Sent: Friday, 18 November 2011 1:50 PM
Subject: ARQ Building query incrementally help
Dear all,
I need some help in changing my static SPARQL query to build Incrementally
using ARQ.
below is my query
1 PREFIX dc: <http://purl.org/dc/terms/>
2 PREFIX db: <http://data.linkedmdb.org/resource/>
3 PREFIX foaf: <http://xmlns.com/foaf/0.1/>
4 PREFIX movie: <http://data.linkedmdb.org/resource/movie/>
5 PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
6 PREFIX oddlinker: <http://data.linkedmdb.org/resource/oddlinker/>
7 PREFIX d2r:
<http://sites.wiwiss.fu-berlin.de/suhl/bizer/d2r-server/config.rdf#>
8 PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
9 PREFIX owl: <http://www.w3.org/2002/07/owl#>
10 PREFIX map: <file:///C:/d2r-server-0.4/mapping.n3#>
11 PREFIX dbpedia: <http://dbpedia.org/property/>
12 PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
13 PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
14 PREFIX fn: <java:facet.>
15
16 SELECT ?fpredicate (count(distinct ?instance) AS ?ficount) (count(distinct
?object) AS ?focount) (fn:weights3(count(distinct ?instance), count(distinct
?object), 85620) AS ?coverage) ?otype
17 WHERE
18 { ?instance rdf:type movie:film .
19 ?instance ?fpredicate ?object
20 FILTER regex(str(?fpredicate), "http://data.linkedmdb.org/resource/";,
"i")
21 }
22 GROUP BY ?fpredicate (fn:ifuri(?object) AS ?otype)
1 (project (?fpredicate ?ficount ?focount ?coverage ?otype)
2 (extend ((?ficount ?.0) (?focount ?.1) (?coverage (<java:facet.weights3>
?.0 ?.1 85620)))
3 (group (?fpredicate (?otype (<java:facet.ifuri> ?object))) ((?.0 (count
distinct ?instance)) (?.1 (count distinct ?object)))
4 (filter (regex (str ?fpredicate)
"http://data.linkedmdb.org/resource/"; "i")
5 (bgp
6 (triple ?instance
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://data.linkedmdb.org/resource/movie/film>)
7 (triple ?instance ?fpredicate ?object)
8 )))))
</code></pre>
I want to build the above query incrementally because, I dynamically add
Triples (as constraints) inside bgp.
I really appreciate if any of experts here can at least give me rough code. I
have seen all the documentation
went through the ARQ code of AlgebraGenerator but it did not help me. I am
still confused in adding
functions to projections grouping by functions. Kindly pardon me it was
trivial.
I appreciate your help.
Regards
aj
