How to use

Eval

in

org.apache.jena.sparql.engine.ref

@Override
public void visit(OpDatasetNames dsNames)
{
  push(Eval.evalDS(dsNames, evaluator)) ;
}

@Override
public void visit(OpGraph opGraph)
{
  push(Eval.evalGraph(opGraph, evaluator)) ;
}

@Override
public void visit(OpQuadPattern quadPattern)
{
  push(Eval.evalQuadPattern(quadPattern, evaluator)) ;
}

@Override
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) ;
}

  return new TableEmpty() ;
ExecutionContext cxt2 = new ExecutionContext(cxt, g) ;
QueryIterator qIter = executeBGP(pattern, QueryIterRoot.create(cxt2), cxt2) ;
return TableFactory.create(qIter) ;
  QueryIterator qIter = executeBGP(pattern, QueryIterRoot.create(cxt2), cxt2) ;
  Table t2 = TableFactory.create(qIter) ;
  Table t3 = evaluator.join(t1, t2) ;

ExecutionContext execCxt2 = new ExecutionContext(execCxt, graph) ;
Evaluator e2 = EvaluatorFactory.create(execCxt2) ;
return eval(e2, opGraph.getSubOp()) ;
Table patternTable = eval(e2, opGraph.getSubOp()) ;
Table stepResult = evaluator.join(patternTable, tableVarURI) ;