protected override IEnumerable <CollectionOperation <TAdaptee> > Enumerate()
{
foreach (var update in _adaptee.Operations())
{
switch (update.Type)
{
case CollectionOperationType.Add:
var added = _state.Get(update.Item, _removedOnChange);
yield return(CollectionOperation <TAdaptee> .OnAdd(added));
break;
case CollectionOperationType.Remove:
var removed = _state.Get(update.Item, _removedOnChange);
yield return(CollectionOperation <TAdaptee> .OnRemove(removed));
break;
case CollectionOperationType.Clear:
yield return(CollectionOperation <TAdaptee> .OnClear());
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
public IEnumerable <CollectionOperation <TAdaptee> > Operations()
{
foreach (var u in _adaptee.Operations())
{
switch (u.Type)
{
case CollectionOperationType.Add:
yield return(CollectionOperation <TAdaptee> .OnAdd(_selector(u.Item)));
break;
case CollectionOperationType.Remove:
yield return(CollectionOperation <TAdaptee> .OnRemove(_selector(u.Item)));
break;
case CollectionOperationType.Clear:
yield return(CollectionOperation <TAdaptee> .OnClear());
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
private static IEnumerable <CollectionOperation <T> > Enumerate([NotNull] ICollectionReplaceOperation <T> replace)
{
yield return(CollectionOperation <T> .OnRemove(replace.ReplacedItem));
yield return(CollectionOperation <T> .OnAdd(replace.Item));
}
private static ItemOrEnumerable <CollectionOperation <T> > OnRemove([NotNull] ICollectionRemoveOperation <T> remove) => new ItemOrEnumerable <CollectionOperation <T> >(CollectionOperation <T> .OnRemove(remove.Item));