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

com.hp.hpl.jena.sparql.engine.QueryIterator
Root of query iterators in ARQ.

        return TableFactory.createUnit() ;
    }


    private Table joinWorker(Table tableLeft, Table tableRight, boolean leftJoin, ExprList conditions)
    {
        QueryIterator left = tableLeft.iterator(execCxt) ;
        JoinType joinType = (leftJoin? JoinType.LEFT : JoinType.PLAIN ) ;
        QueryIterator qIter = TableJoin.joinWorker(left, tableRight, joinType, conditions, execCxt) ;
        tableLeft.close() ;
        tableRight.close() ;
        // qIter and left should be properly closed by use or called code. 
        return new TableN(qIter) ;
    }

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    }
    
    // @@ Abstract compatibility
    private Table diffWorker(Table tableLeft, Table tableRight)
    {
        QueryIterator left = tableLeft.iterator(execCxt) ;
        TableN r = new TableN() ;
        for ( ; left.hasNext() ; )
        {
            Binding b = left.nextBinding() ;
            if ( tableRight.contains(b) )
                r.addBinding(b) ;
        }
        tableLeft.close() ;
        tableRight.close() ;

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    private Table minusWorker(Table tableLeft, Table tableRight)
    {
        // Minus(Ω1, Ω2) = { μ | μ in Ω1 such that for all μ' in Ω2, either μ and μ' are not compatible or dom(μ) and dom(μ') are disjoint }
        
        TableN results = new TableN() ;
        QueryIterator iterLeft = tableLeft.iterator(execCxt) ;
        for ( ; iterLeft.hasNext() ; )
        {
            Binding bindingLeft = iterLeft.nextBinding() ;
            boolean includeThisRow = true ;
            // Find a reason not to include the row.
            // That's is not disjoint and not compatible.
            
            QueryIterator iterRight = tableRight.iterator(execCxt) ;
            for ( ; iterRight.hasNext() ; )
            {
                Binding bindingRight = iterRight.nextBinding() ;
                if ( Algebra.disjoint(bindingLeft, bindingRight) )
                    // Disjoint - not a reason to exclude
                    continue ;
                
                if ( ! Algebra.compatible(bindingLeft, bindingRight) )
                    // Compatible - not a reason to exclude.
                    continue ;
                
                includeThisRow = false ;
                break ;
                
            }
            iterRight.close();
            if ( includeThisRow )
                results.addBinding(bindingLeft) ;
        } 


        iterLeft.close();

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    }


    /** Public interface is via QC.execute. **/
    static QueryIterator execute(Op op, QueryIterator qIter, ExecutionContext execCxt) {
        OpExecutor exec = createOpExecutor(execCxt) ;
        QueryIterator q = exec.exec(op, qIter) ;
        return q ;
    }

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            Iterator<QueryIterator> iterAll = execContext.listAllIterators() ;


            if ( iterAll != null )
                while(iterAll.hasNext())
                {
                    QueryIterator qIter = iterAll.next() ;
                    warn(qIter, "Iterator: ") ;
                }
        }


        Iterator<QueryIterator> iterOpen = execContext.listOpenIterators() ;
        while(iterOpen.hasNext())
        {
            QueryIterator qIterOpen = iterOpen.next() ;
            warn(qIterOpen, "Open iterator: ") ;
            iterOpen.remove() ;
        }
    }

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    }
    
    // ---- The recursive step.
    protected QueryIterator exec(Op op, QueryIterator input) {
        level++ ;
        QueryIterator qIter = dispatcher.exec(op, input) ;
        // Intentionally not try/finally so exceptions leave some evidence
        // around.
        level-- ;
        return qIter ;
    }

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    // ---- All the cases


    protected QueryIterator execute(OpBGP opBGP, QueryIterator input) {
        BasicPattern pattern = opBGP.getPattern() ;
        QueryIterator qIter = stageGenerator.execute(pattern, input, execCxt) ;
        if (hideBNodeVars)
            qIter = new QueryIterDistinguishedVars(qIter, execCxt) ;
        return qIter ;
    }

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    protected QueryIterator execute(OpTriple opTriple, QueryIterator input) {
        return execute(opTriple.asBGP(), input) ;
    }


    protected QueryIterator execute(OpGraph opGraph, QueryIterator input) {
        QueryIterator qIter = specialcase(opGraph.getNode(), opGraph.getSubOp(), input) ;
        if (qIter != null)
            return qIter ;
        return new QueryIterGraph(input, opGraph, execCxt) ;
    }

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    }


    private static void dump(Table table)
    {
        System.out.println("Table: "+Utils.className(table)) ;
        QueryIterator qIter = table.iterator(null) ;
        ResultSet rs = new ResultSetStream(table.getVarNames(), null, table.iterator(null)) ;
        ResultSetFormatter.out(rs) ;
    }

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    @Override
    protected QueryIterator nextStage(Binding outerBinding)
    {
        Op op = QC.substitute(opService, outerBinding) ;
        boolean silent = opService.getSilent() ;
        QueryIterator qIter ;
        try {
            qIter = Service.exec((OpService)op, getExecContext().getContext()) ;
            // This iterator is materialized already otherwise we may end up
            // not servicing the HTTP connection as needed.
            // In extremis, can cause a deadlock when SERVICE loops back to this server.
            // Add tracking.
            qIter = QueryIter.makeTracked(qIter, getExecContext()) ;
        } catch (RuntimeException ex)
        {
            if ( silent )
            {
                Log.warn(this, "SERVICE <" + opService.getService().toString() + ">: " + ex.getMessage()) ;
                // Return the input
                return QueryIterSingleton.create(outerBinding, getExecContext()) ; 
            }
            throw ex ;
        }
            
        // Need to put the outerBinding as parent to every binding of the service call.
        // There should be no variables in common because of the OpSubstitute.substitute 
        QueryIterator qIter2 = new QueryIterCommonParent(qIter, outerBinding, getExecContext()) ;
        return qIter2 ;
    }

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