AbstractListDataView extends AbstractDataView<T> implements ListDataView<T, AbstractListDataView<T>> { @Override public Optional<T> getNextItem(T item) { int index = getItemIndex(item); if (index < 0) { return Optional.empty(); } return getItems().skip(index + 1).findFirst(); } AbstractListDataView(
            SerializableSupplier<? extends DataProvider<T, ?>> dataProviderSupplier,
            Component component); @Override int getItemCount(); @Override T getItem(int index); @Override Optional<T> getNextItem(T item); @Override Optional<T> getPreviousItem(T item); @Override AbstractListDataView<T> addFilter(SerializablePredicate<T> filter); @Override AbstractListDataView<T> removeFilters(); @Override AbstractListDataView<T> setFilter(SerializablePredicate<T> filter); @Override AbstractListDataView<T> setSortComparator(
            SerializableComparator<T> sortComparator); @Override AbstractListDataView<T> addSortComparator(
            SerializableComparator<T> sortComparator); @Override AbstractListDataView<T> removeSorting(); @Override AbstractListDataView<T> setSortOrder(
            ValueProvider<T, V1> valueProvider, SortDirection sortDirection); @Override AbstractListDataView<T> addSortOrder(
            ValueProvider<T, V1> valueProvider, SortDirection sortDirection); @Override boolean contains(T item); @Override AbstractListDataView<T> addItem(T item); @Override AbstractListDataView<T> addItems(Collection<T> items); @Override AbstractListDataView<T> addItemAfter(T item, T after); @Override AbstractListDataView<T> addItemBefore(T item, T before); @Override AbstractListDataView<T> addItemsAfter(Collection<T> items, T after); @Override AbstractListDataView<T> addItemsBefore(Collection<T> items,
            T before); @Override AbstractListDataView<T> removeItem(T item); @Override AbstractListDataView<T> removeItems(Collection<T> items);  }
@Test public void getNextItem_nextItemAvailable_nextItemFound() { Optional<String> middle = dataView.getNextItem("middle"); Assert.assertTrue(middle.isPresent()); Assert.assertEquals("Faulty next item", "last", middle.get()); }
@Test public void getNextItem_nextItemUnavailable_nextItemNotFound() { Assert.assertFalse("Got next item for last item", dataView.getNextItem("last").isPresent()); }