private static Collection<KeyStroke> getKeystrokesUpDown(boolean isUp) {
    Collection<KeyStroke> result = new ArrayList<>();

    final ShortcutSet shortcutSet = getShortcutUpDown(isUp);
    for (Shortcut shortcut : shortcutSet.getShortcuts()) {
      if (shortcut.isKeyboard() && ((KeyboardShortcut)shortcut).getSecondKeyStroke() == null) {
        result.add(((KeyboardShortcut)shortcut).getFirstKeyStroke());
      }
    }

    return result;
  }
private static Collection<KeyStroke> getKeystrokesUpDown(boolean isUp)