private @Nullable SliceValueFilter getFilter() throws SliceFilterParseException {
        if (myUi == null) return null;
        final JTextField field = myUi.getField();
        String text = field.getText().trim();
        if (!text.isEmpty()) {
          return provider.parseFilter(element, text);
        }
        return null;
      }
private @Nullable SliceValueFilter getFilter()