public SimpleItemListModel<T> setDisplayMapper(final Function<T, TextParam> displayMapper) {
        if (displayMapper != null) {
            setDisplayMapper((item, itemGroup) -> displayMapper.apply(item), null, null);
        }
        return this;    }
Sets a display providing the text visualization for an item
main/src/main/java/cgeo/geocaching/ui/SimpleItemListModel.java