Package com.hp.hpl.jena.sparql.engine

Examples of com.hp.hpl.jena.sparql.engine.ExecutionContext

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    private Iterator<Triple> graphFindWorker(Graph graph, Node s, PropertyFunctionFactory f, Node p, Node o, Context context) {
        // Expensive?
        PropertyFunction pf = f.create(p.getURI()) ;
        PropFuncArg sv = arg(s, "S") ;
        PropFuncArg ov = arg(o, "O") ;
        QueryIterator r = QueryIterRoot.create(new ExecutionContext(context, graph, null, null)) ;
        QueryIterator qIter = pf.exec(r, sv, p, ov, new ExecutionContext(ARQ.getContext(), graph, null, null)) ;
        if ( ! qIter.hasNext() )
            return Iter.nullIterator() ;
        List<Triple> array = new ArrayList<Triple>() ;
        for ( ; qIter.hasNext() ; ) {
            Binding b = qIter.next() ;
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    private QueryIterator specialcase(Node gn, Op subOp, QueryIterator input) {
        // This is a placeholder for code to specially handle explicitly named
        // default graph and union graph.

        if (Quad.isDefaultGraph(gn)) {
            ExecutionContext cxt2 = new ExecutionContext(execCxt, execCxt.getDataset().getDefaultGraph()) ;
            return execute(subOp, input, cxt2) ;
        }

        if ( Quad.isUnionGraph(gn) )
            Log.warn(this, "Not implemented yet: union default graph in general OpExecutor") ;
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            // And the contains was true??!!!!!!
            if ( g == null )
                return null ;
                //throw new ARQInternalErrorException(".containsGraph was true but .getGraph is null") ;
           
            ExecutionContext cxt2 = new ExecutionContext(outerCxt, g) ;
            QueryIterator subInput = QueryIterSingleton.create(binding, cxt2) ;
            return QC.execute(op, subInput, cxt2) ;
        }
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    public QueryIterator eval(Op op, DatasetGraph dsg, Binding binding, Context context)
    {
        if ( binding.vars().hasNext() )
            op = Substitute.substitute(op, binding) ;

        ExecutionContext execCxt = new ExecutionContext(context, dsg.getDefaultGraph(), dsg, QC.getFactory(context)) ;
        Evaluator eval = EvaluatorFactory.create(execCxt) ;
        Table table = Eval.eval(eval, op) ;
        QueryIterator qIter = table.iterator(execCxt) ;
        return QueryIteratorCheck.check(qIter, execCxt) ;
    }
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        // -- Execute
        // Switch to a non-reordering executor
        // The Op may be a sequence due to TransformFilterPlacement
        // so we need to do a full execution step, not go straight to the SolverLib.
       
        ExecutionContext ec2 = new ExecutionContext(execCxt) ;
        ec2.setExecutor(plainFactory) ;

        // Solve without going through this executor again.
        // There would be issues of nested patterns but this is only a
        // (filter (bgp...)) or (filter (quadpattern ...)) or sequences of these.
        // so there are no nested patterns to reorder.
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    private QueryIterator specialcase(Node gn, Op subOp, QueryIterator input) {
        // This is a placeholder for code to specially handle explicitly named
        // default graph and union graph.

        if (Quad.isDefaultGraph(gn)) {
            ExecutionContext cxt2 = new ExecutionContext(execCxt, execCxt.getDataset().getDefaultGraph()) ;
            return execute(subOp, input, cxt2) ;
        }

        if ( Quad.isUnionGraph(gn) )
            Log.warn(this, "Not implemented yet: union default graph in general OpExecutor") ;
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            // And the contains was true??!!!!!!
            if ( g == null )
                return null ;
                //throw new ARQInternalErrorException(".containsGraph was true but .getGraph is null") ;
           
            ExecutionContext cxt2 = new ExecutionContext(outerCxt, g) ;
            QueryIterator subInput = QueryIterSingleton.create(binding, cxt2) ;
            return QC.execute(op, subInput, cxt2) ;
        }
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    }
   
    static Table evalGraph(OpGraph opGraph, Evaluator evaluator)
    {
        ExecutionContext execCxt = evaluator.getExecContext() ;
       
        if ( ! Var.isVar(opGraph.getNode()) )
        {
            Graph graph = execCxt.getDataset().getGraph(opGraph.getNode()) ;
            if ( graph == null )
                // No such name in the dataset
                return new TableEmpty() ;
            ExecutionContext execCxt2 = new ExecutionContext(execCxt, graph) ;
            Evaluator e2 = EvaluatorFactory.create(execCxt2) ;
            return eval(e2, opGraph.getSubOp()) ;
        }
       
        // Graph node is a variable.
        Var gVar = Var.alloc(opGraph.getNode()) ;
        Table current = null ;
        for ( Iterator<Node> iter = execCxt.getDataset().listGraphNodes() ; iter.hasNext() ; )
        {
            Node gn = iter.next();
            Graph graph = execCxt.getDataset().getGraph(gn) ;
            ExecutionContext execCxt2 = new ExecutionContext(execCxt, graph) ;
            Evaluator e2 = EvaluatorFactory.create(execCxt2) ;
           
            Table tableVarURI = TableFactory.create(gVar, gn) ;
            // Evaluate the pattern, join with this graph node possibility.
            // XXX If Var.ANON then no-opt.
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    static Table evalQuadPattern(OpQuadPattern opQuad, Evaluator evaluator)
    {
        if ( opQuad.isEmpty() )
            return TableFactory.createUnit() ;
       
        ExecutionContext cxt = evaluator.getExecContext() ;
        DatasetGraph ds = cxt.getDataset() ;
        BasicPattern pattern = opQuad.getBasicPattern() ;
       
        if ( ! opQuad.getGraphNode().isVariable() )
        {
            if ( ! opQuad.getGraphNode().isURI() )
            { throw new ARQInternalErrorException("Not a URI or variable: "+opQuad.getGraphNode()) ;}
            Graph g = null ;
           
            if ( opQuad.isDefaultGraph() )
                g = ds.getDefaultGraph() ;
            else
                g = ds.getGraph(opQuad.getGraphNode()) ;
            if ( g == null )
                return new TableEmpty() ;
            ExecutionContext cxt2 = new ExecutionContext(cxt, g) ;
            QueryIterator qIter = executeBGP(pattern, QueryIterRoot.create(cxt2), cxt2) ;
            return TableFactory.create(qIter) ;
        }
        else
        {
            // Variable.
            Var gVar = Var.alloc(opQuad.getGraphNode()) ;
            // Or just just devolve to OpGraph and get OpUnion chain of OpJoin
            QueryIterConcat concat = new QueryIterConcat(cxt) ;
            for ( Iterator<Node> graphNodes = cxt.getDataset().listGraphNodes() ; graphNodes.hasNext(); )
            {
                Node gn = graphNodes.next() ;
                //Op tableVarURI = TableFactory.create(gn.getName(), Node.createURI(uri)) ;
               
                Graph g = cxt.getDataset().getGraph(gn) ;
                Binding b = BindingFactory.binding(BindingRoot.create(), gVar, gn) ;
                ExecutionContext cxt2 = new ExecutionContext(cxt, g) ;

                // Eval the pattern, eval the variable, join.
                // Pattern may be non-linear in the variable - do a pure execution. 
                Table t1 = TableFactory.create(gVar, gn) ;
                QueryIterator qIter = executeBGP(pattern, QueryIterRoot.create(cxt2), cxt2) ;
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    public static NodeValue eval(Expr expr, Binding binding)
    {
        Context context = ARQ.getContext().copy() ;
        context.set(ARQConstants.sysCurrentTime, NodeFactoryExtra.nowAsDateTime()) ;
        FunctionEnv env = new ExecutionContext(context, null, null, null) ;
        NodeValue r = expr.eval(binding, env) ;
        return r ;
    }
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Related Classes of com.hp.hpl.jena.sparql.engine.ExecutionContext

  • arq.qexpr
  • com.hp.hpl.jena.sdb.engine.QueryEngineSDB
  • com.hp.hpl.jena.sdb.store.TupleTable
  • com.hp.hpl.jena.sparql.engine.iterator.TestQueryIterSort
  • com.hp.hpl.jena.sparql.engine.main.iterator.QueryIterGraph$QueryIterGraphInner
  • com.hp.hpl.jena.sparql.engine.main.OpExecutor
  • com.hp.hpl.jena.sparql.engine.main.QueryEngineMain
  • com.hp.hpl.jena.sparql.engine.ref.Eval
  • com.hp.hpl.jena.sparql.engine.ref.QueryEngineRef
  • com.hp.hpl.jena.sparql.engine.TestTableLib
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