public void handleEvent(Event event) {
String feederInfo = feederRegistry.current().getInfo();
InputDialog inputDialog = new InputDialog(
Labels.getLabel("title.favorite.add"),
Labels.getLabel("text.favorite.add"));
String favoriteName = inputDialog.open(feederInfo);
if (favoriteName != null) {
if (favoritesConfig.get(favoriteName) != null) {
throw new UserErrorException("favorite.alreadyExists");
}