private <T> List<T> getSelectedElements(Class<T> klass) {
final Object[] elements = getSelectedNodeElements();
ArrayList<T> result = new ArrayList<T>();
if (elements == null) {
return result;
}
for (Object element : elements) {
if (element == null) continue;
if (klass.isAssignableFrom(element.getClass())) {
result.add((T) element);
}
}
return result;
}
