public static <T> Diff<T> createDiff(List<T> existingElements, List<T> newElements) {
if (existingElements == null) {
existingElements = Collections.EMPTY_LIST;
}
if (newElements == null) {
newElements = Collections.EMPTY_LIST;
}
Diff<T> diff = new Diff<T>();
diff.elementsToRemove = new ArrayList<T>(existingElements);
diff.elementsToRemove.removeAll(newElements);
diff.elementsToAdd = new ArrayList<T>(newElements);
diff.elementsToAdd.removeAll(existingElements);
diff.intersectionElements = new ArrayList<T>(existingElements);
diff.intersectionElements.removeAll(diff.elementsToRemove);
return diff;
}
