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

com.hp.hpl.jena.sparql.engine.ResultSetStream
The main ResultSet implementation for returning results from queries. This version is "use once" - you can not reset the result set because the results of the query are not remembered so as not to consume potentially large amounts of memory.

                continue ;
            seen.add(b) ;
            x.add(b) ;
        }
        QueryIterator qIter = new QueryIterPlainWrapper(x.iterator()) ;
        ResultSet rs = new ResultSetStream(results.getResultVars(), ModelFactory.createDefaultModel(), qIter) ;
        return ResultSetFactory.makeRewindable(rs) ;
    }

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     *  @param vars     List of variables, by name, for the result set
     *  @return ResultSet 
     */
    static public ResultSet create(QueryIterator queryIterator, List<String> vars)
    {
        return new ResultSetStream(vars, null, queryIterator) ;
    }

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          }
        } catch ( IOException ex ) {
          throw new ARQException(ex) ;
        }


        return new ResultSetStream(varNames, null, new QueryIterPlainWrapper(bindings.iterator()));
    }

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    {
        parse(in) ;
        if ( rows != null )
        {
            QueryIterator qIter = new QueryIterPlainWrapper(rows.iterator()) ;
            ResultSet rs = new ResultSetStream(Var.varNames(vars), model, qIter) ;
            super.set(rs) ;
        }
        else
            super.set(booleanResult) ;
        return this ;

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                    s = NodeFunctions.str(n) ;
                b2.add(v, NodeFactory.createLiteral(s)) ;
            }
            bindings.add(b2) ;
        }
        ResultSet rs = new ResultSetStream(resultsActual.getResultVars(), null, new QueryIterPlainWrapper(bindings.iterator())) ;
        return ResultSetFactory.makeRewindable(rs) ;
    }

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                continue ;
            seen.add(b) ;
            x.add(b) ;
        }
        QueryIterator qIter = new QueryIterPlainWrapper(x.iterator()) ;
        ResultSet rs = new ResultSetStream(results.getResultVars(), ModelFactory.createDefaultModel(), qIter) ;
        return ResultSetFactory.makeRewindable(rs) ;
    }

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        try {
            // Run first without optimization
            ARQ.set(opt, false);
            QueryEngineMain engine = new QueryEngineMain(op, ds.asDatasetGraph(), BindingFactory.binding(), ARQ.getContext());
            QueryIterator iter = engine.eval(op, ds.asDatasetGraph(), BindingFactory.binding(), ARQ.getContext());
            ResultSetRewindable rs = ResultSetFactory.makeRewindable(new ResultSetStream(vars, ModelFactory.createDefaultModel(),
                    iter));
            if (expected != rs.size()) {
                System.err.println("Non-optimized results not as expected");
                TextOutput output = new TextOutput((SerializationContext)null);
                output.format(System.out, rs);
                rs.reset();
            }
            Assert.assertEquals(expected, rs.size());
            iter.close();


            // Run with optimization
            ARQ.set(opt, true);
            engine = new QueryEngineMain(op, ds.asDatasetGraph(), BindingFactory.binding(), ARQ.getContext());
            QueryIterator iterOpt = engine.eval(op, ds.asDatasetGraph(), BindingFactory.binding(), ARQ.getContext());
            ResultSetRewindable rsOpt = ResultSetFactory.makeRewindable(new ResultSetStream(vars, ModelFactory
                    .createDefaultModel(), iterOpt));
            if (expected != rsOpt.size()) {
                System.err.println("Optimized results not as expected");
                TextOutput output = new TextOutput((SerializationContext)null);
                output.format(System.out, rsOpt);

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            throw new ARQException(ex) ;
        }


        //Generate an instance of ResultSetStream using TSVInputIterator
        //This will parse actual result rows as needed thus minimising memory usage
        return new ResultSetStream(varNames, null, new CSVInputIterator(reader, vars));
    }

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          throw new ARQException(ex) ;
        }


        //Generate an instance of ResultSetStream using TSVInputIterator
        //This will parse actual result rows as needed thus minimising memory usage
        return new ResultSetStream(varNames, null, new TSVInputIterator(reader, vars));
    }

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          throw new ARQException(ex) ;
        }


        //Generate an instance of ResultSetStream using TSVInputIterator
        //This will parse actual result rows as needed thus minimising memory usage
        return new ResultSetStream(varNames, null, new TSVInputIterator(reader, vars));
    }

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