Package com.hp.hpl.jena.sparql.algebra.op

Examples of com.hp.hpl.jena.sparql.algebra.op.OpBGP

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    @Override
    public Op transform(OpQuadPattern quadPattern)
    {
        if ( quadPattern.isDefaultGraph() || quadPattern.isUnionGraph() )
        {
            OpBGP opBGP = new OpBGP(quadPattern.getBasicPattern()) ;
            return union(opBGP) ;
        }
       
        // Leave alone.
        // if ( quadPattern.isExplicitDefaultGraph() ) {}
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        Triple triple = new Triple(s, p ,o) ;
       
        // Evaluate as an algebra expression
        BasicPattern pattern = new BasicPattern() ;
        pattern.add(triple) ;
        Op op = new OpBGP(pattern) ;
        Plan plan = factory.create(op, getDataset(), BindingRoot.create(), null) ;
       
        QueryIterator qIter = plan.iterator() ;
        //List<Triple> triples = new ArrayList<Triple>() ;
        List<Triple> triples = new ArrayList<>() ;
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        // Find the triples invoking property functions, and those not.
        findPropertyFunctions(context, pattern, registry, propertyFunctionTriples) ;
       
        if ( propertyFunctionTriples.size() == 0 )
            //No property functions.
            return new OpBGP(pattern) ;
       
        Map<Triple, PropertyFunctionInstance> pfInvocations = new HashMap<>() ;  // Map triple => property function instance
        // Removes triples of list arguments.  This mutates 'triples'
        findPropertyFunctionArgs(context, triples, propertyFunctionTriples, pfInvocations) ;
       
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        {
            if ( op == null )
                return OpTable.unit() ;
            return op ;
        }
        OpBGP opBGP = new OpBGP(pattern) ;
        return OpSequence.create(op, opBGP) ;
    }
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    }
    BasicPattern pattern = new BasicPattern();
    for (Triple t: q.getPattern()) {
      pattern.add(t);
    }
    Plan plan = QueryEngineD2RQ.getFactory().create(new OpBGP(pattern), dataset, null, null);
    final ExtendedIterator<Domain> queryIterator = new Map1Iterator<Binding,Domain>(new BindingToDomain(), plan.iterator());
    return new BindingQueryPlan() {
      public ExtendedIterator<Domain> executeBindings() {
        return queryIterator;
      }
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        Var var_x = Var.alloc("x") ;
        Var var_z = Var.alloc("z") ;
       
        // ---- Build expression
        bp.add(new Triple(var_x, Node.createURI(BASE+"p"), var_z)) ;
        Op op = new OpBGP(bp) ;
        //Expr expr = ExprUtils.parse("?z < 2 ") ;
        Expr expr = new E_LessThan(new ExprVar(var_z), NodeValue.makeNodeInteger(2)) ;
        op = OpFilter.filter(expr, op) ;

        // ---- Example setup
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    static private Op flush(BasicPattern bp, Op op)
    {
        if ( bp == null || bp.isEmpty() )
            return op ;
       
        OpBGP opBGP = new OpBGP(bp) ;
        op = OpSequence.create(op, opBGP) ;
        return op ;
    }
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        // Find the triples invoking property functions, and those not.
        findPropertyFunctions(context, pattern, registry, propertyFunctionTriples) ;
       
        if ( propertyFunctionTriples.size() == 0 )
            //No property functions.
            return new OpBGP(pattern) ;
       
        Map<Triple, PropertyFunctionInstance> pfInvocations = new HashMap<Triple, PropertyFunctionInstance>() ;  // Map triple => property function instance
        // Removes triples of list arguments.  This mutates 'triples'
        findPropertyFunctionArgs(context, triples, propertyFunctionTriples, pfInvocations) ;
       
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        {
            if ( op == null )
                return OpTable.unit() ;
            return op ;
        }
        OpBGP opBGP = new OpBGP(pattern) ;
        return OpSequence.create(op, opBGP) ;
    }
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    @Override
    public Op transform(OpQuadPattern quadPattern)
    {
        if ( quadPattern.isDefaultGraph() || quadPattern.isUnionGraph() )
        {
            OpBGP opBGP = new OpBGP(quadPattern.getBasicPattern()) ;
            return union(opBGP) ;
        }
       
        // Leave alone.
        // if ( quadPattern.isExplicitDefaultGraph() ) {}
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Related Classes of com.hp.hpl.jena.sparql.algebra.op.OpBGP

  • arq.examples.AlgebraExec
  • arq.examples.propertyfunction.labelSearch
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  • com.hp.hpl.jena.sparql.algebra.optimize.TransformFilterPlacement_Old
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformFilterPlacementConservative
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformMergeBGPs
  • com.hp.hpl.jena.sparql.algebra.optimize.TransformReorder
  • com.hp.hpl.jena.sparql.algebra.PropertyFunctionGenerator
  • com.hp.hpl.jena.sparql.algebra.TransformUnionQuery
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