How to use

condition

method

in

org.apache.jena.sparql.engine.ref.Evaluator

@Override
public void visit(OpConditional opCond)
{
  Table left = eval(opCond.getLeft()) ;
  // Ref engine - don;'t care about efficiency
  Table right = eval(opCond.getRight()) ;
  Table table = evaluator.condition(left, right) ;
  push(table) ;
}