Examples with QueryIterator org.apache.jena.sparql.engine.QueryIterator used on opensource projects

Example 86 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class EvaluatorSimple method extend.

@Override
public Table extend(Table table, VarExprList exprs) {
    QueryIterator qIter = table.iterator(getExecContext());
    qIter = new QueryIterAssign(qIter, exprs, getExecContext(), true);
    return new TableN(qIter);
}

Example 87 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class EvaluatorSimple method propertyFunction.

@Override
public Table propertyFunction(Table table, Node procId, PropFuncArg subjArgs, PropFuncArg objArgs) {
    Procedure proc = ProcEval.build(procId, subjArgs, objArgs, execCxt);
    QueryIterator qIter = ProcEval.eval(table.iterator(execCxt), proc, execCxt);
    return TableFactory.create(qIter);
}

Example 88 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class AlgebraExec method main.

public static void main(String[] argv) {
    String BASE = "http://example/";
    BasicPattern bp = new BasicPattern();
    Var var_x = Var.alloc("x");
    Var var_z = Var.alloc("z");
    // ---- Build expression
    bp.add(new Triple(var_x, NodeFactory.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
    Model m = makeModel();
    m.write(System.out, "TTL");
    System.out.println("--------------");
    System.out.print(op);
    System.out.println("--------------");
    // ---- Execute expression
    QueryIterator qIter = Algebra.exec(op, m.getGraph());
    // -------- Either read the query iterator directly ...
    if (false) {
        for (; qIter.hasNext(); ) {
            Binding b = qIter.nextBinding();
            Node n = b.get(var_x);
            System.out.println(NodeFmtLib.displayStr(n));
            System.out.println(b);
        }
        qIter.close();
    } else {
        // -------- Or make ResultSet from it (but not both - reading an
        //          iterator consumes the current solution)
        List<String> varNames = new ArrayList<>();
        varNames.add("x");
        varNames.add("z");
        ResultSet rs = new ResultSetStream(varNames, m, qIter);
        ResultSetFormatter.out(rs);
        qIter.close();
    }
    System.exit(0);
}

Example 89 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class TableBase method toResultSet.

@Override
public ResultSet toResultSet() {
    QueryIterator qIter = iterator(null);
    ResultSet rs = new ResultSetStream(getVarNames(), null, qIter);
    rs = ResultSetFactory.makeRewindable(rs);
    qIter.close();
    return rs;
}

Example 90 with QueryIterator

use of org.apache.jena.sparql.engine.QueryIterator in project jena by apache.

the class TableWriter method output.

public static void output(Table table, IndentedWriter out, SerializationContext sCxt) {
    // Prefix. But then qnames are wrong.
    if (sCxt != null) {
    }
    out.print("(table");
    out.incIndent();
    QueryIterator qIter = table.iterator(null);
    for (; qIter.hasNext(); ) {
        out.println();
        Binding binding = qIter.nextBinding();
        output(binding, out, sCxt);
    }
    out.decIndent();
    out.print(")");
}