CardCollection removeCards(
CardCollection oldCards, Iterable<Card> cardsToRemove, TrackableProperty key) {
if (cardsToRemove == null || oldCards == null) {
return oldCards;
}
TrackableCollection<CardView> views = get(key);
boolean needFlagAsChanged = false;
for (Card c : cardsToRemove) {
if (oldCards.remove(c)) {
if (views == null) {
set(key, null);
} else if (views.remove(c.getView())) {
if (views.isEmpty()) {
views = null;
set(key, null); // avoid keeping around an empty collection
needFlagAsChanged = false; // doesn't need to be flagged a second time
} else {
needFlagAsChanged = true;
}
}
if (oldCards.isEmpty()) {
oldCards = null; // avoid keeping around an empty collection
break;
}
}
}
if (needFlagAsChanged) {
flagAsChanged(key);
}
return oldCards;
}
CardCollection removeCard(CardCollection oldCards, Card cardToRemove, TrackableProperty key) {
if (cardToRemove == null || oldCards == null) {
return oldCards;
}
if (oldCards.remove(cardToRemove)) {
TrackableCollection<CardView> views = get(key);
if (views == null) {
set(key, null);
} else if (views.remove(cardToRemove.getView())) {
if (views.isEmpty()) {
set(key, null); // avoid keeping around an empty collection
} else {
flagAsChanged(key);
}
}
if (oldCards.isEmpty()) {
oldCards = null; // avoid keeping around an empty collection
}
}
return oldCards;
}