How to use

replaceWith

method

in

org.openrdf.query.algebra.Slice

@Override
public void meet(Slice node) throws RuntimeException {
  TupleExpr child = node.getArg();
  if(!isSupported(child) && child instanceof UnaryTupleOperator) {
    UnaryTupleOperator replacement = (UnaryTupleOperator)child.clone();
    // switch positions of child and node
    node.replaceWith(replacement);
    node.setArg(((UnaryTupleOperator) child).getArg().clone());
    replacement.setArg(node.clone());
    // visit the newly inserted replacement node (i.e. the clone of child now containing the old "node" as
    // child, so "node" can be bubbled down further if needed)
    replacement.visit(this);
  }
}

@Override
public void meet(Slice node)
  throws RuntimeException
{
  super.meet(node);
  if (node.getArg() instanceof SelectQuery) {
    SelectQuery query = (SelectQuery)node.getArg();
    if (node.getOffset() > 0) {
      query.setOffset(node.getOffset());
    }
    if (node.getLimit() >= 0) {
      query.setLimit(node.getLimit());
    }
    node.replaceWith(query);
  }
}