Exemple #1
0
        public virtual void RetainAll <U>(SCG.IEnumerable <U> items) where U : T
        {
            updatecheck();

            HashBag <T> res = new HashBag <T>(itemequalityComparer);

            foreach (U item in items)
            {
                KeyValuePair <T, int> p = new KeyValuePair <T, int>(item);
                if (dict.Find(ref p))
                {
                    KeyValuePair <T, int> q = p;
                    if (res.dict.Find(ref q))
                    {
                        if (q.Value < p.Value)
                        {
                            q.Value++;
                            res.dict.Update(q);
                            res.size++;
                        }
                    }
                    else
                    {
                        q.Value = 1;
                        res.dict.Add(q);
                        res.size++;
                    }
                }
            }

            if (size == res.size)
            {
                return;
            }

            CircularQueue <T> wasRemoved = null;

            if ((ActiveEvents & EventTypeEnum.Removed) != 0)
            {
                wasRemoved = new CircularQueue <T>();
                foreach (KeyValuePair <T, int> p in dict)
                {
                    int removed = p.Value - res.ContainsCount(p.Key);
                    if (removed > 0)
#warning We could send bag events here easily using a CircularQueue of (should?)
                    {
                        for (int i = 0; i < removed; i++)
                        {
                            wasRemoved.Enqueue(p.Key);
                        }
                    }
                }
            }
            dict = res.dict;
            size = res.size;

            if ((ActiveEvents & EventTypeEnum.Removed) != 0)
            {
                raiseForRemoveAll(wasRemoved);
            }
            else if ((ActiveEvents & EventTypeEnum.Changed) != 0)
            {
                raiseCollectionChanged();
            }
        }