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 addCards(
CardCollection oldCards, Iterable<Card> cardsToAdd, TrackableProperty key) {
if (cardsToAdd == null) {
return oldCards;
}
TrackableCollection<CardView> views = get(key);
if (oldCards == null) {
oldCards = new CardCollection();
}
boolean needFlagAsChanged = false;
for (Card c : cardsToAdd) {
if (c != null && oldCards.add(c)) {
if (views == null) {
views = new TrackableCollection<CardView>();
views.add(c.getView());
set(key, views);
} else if (views.add(c.getView())) {
needFlagAsChanged = true;
}
}
}
if (needFlagAsChanged) {
flagAsChanged(key);
}
return oldCards;
}
CardCollection setCards(CardCollection oldCards, CardCollection newCards, TrackableProperty key) {
if (newCards == null || newCards.isEmpty()) { // avoid storing empty collections
set(key, null);
return null;
}
set(key, CardView.getCollection(newCards)); // TODO prevent overwriting list if not necessary
return newCards;
}
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;
}
CardCollection addCard(CardCollection oldCards, Card cardToAdd, TrackableProperty key) {
if (cardToAdd == null) {
return oldCards;
}
if (oldCards == null) {
oldCards = new CardCollection();
}
if (oldCards.add(cardToAdd)) {
TrackableCollection<CardView> views = get(key);
if (views == null) {
views = new TrackableCollection<CardView>();
views.add(cardToAdd.getView());
;
set(key, views);
} else if (views.add(cardToAdd.getView())) {
flagAsChanged(key);
}
}
return oldCards;
}