How to use

replaceWith

method

in

org.openrdf.query.algebra.UnaryTupleOperator

@Override
protected void meetUnaryTupleOperator(UnaryTupleOperator node) {
  super.meetUnaryTupleOperator(node);
  if (node.getArg() instanceof EmptySet) {
    node.replaceWith(node.getArg());
  }
}

@Override
protected void meetUnaryTupleOperator(UnaryTupleOperator node)
  throws RepositoryException
{
  super.meetUnaryTupleOperator(node);
  RepositoryConnection owner = getSingleOwner(node.getArg());
  if (owner != null) {
    node.replaceWith(new OwnedTupleExpr(owner, node.clone()));
  }
}

@Override
protected void meetUnaryTupleOperator(UnaryTupleOperator node)
  throws RepositoryException
{
  super.meetUnaryTupleOperator(node);
  RepositoryConnection owner = getSingleOwner(node.getArg());
  if (owner != null) {
    node.replaceWith(new OwnedTupleExpr(owner, node.clone()));
  }
}