/// <summary>
/// 通知观察者合集即将进行清空;
/// </summary>
private void NotifyClear()
{
MapEvent <TKey> mapEvent = new MapEvent <TKey>()
{
Map = this,
EventType = DictionaryEventType.Clear,
};
observers.NotifyNext(mapEvent);
}
/// <summary>
/// 通知观察者合集即将进行加入操作;
/// </summary>
private void NotifyAdd(TKey key, MapNode newValue)
{
MapEvent <TKey> mapEvent = new MapEvent <TKey>()
{
Map = this,
EventType = DictionaryEventType.Add,
Key = key,
NewValue = newValue,
};
observers.NotifyNext(mapEvent);
}
/// <summary>
/// 通知观察者合集即将进行加入操作;
/// </summary>
private void NotifyRemove(TKey key, MapNode originalValue)
{
MapEvent <TKey> mapEvent = new MapEvent <TKey>()
{
Map = this,
EventType = DictionaryEventType.Remove,
Key = key,
OriginalValue = originalValue,
};
observers.NotifyNext(mapEvent);
}
void IObserver <MapEvent <TKey> > .OnNext(MapEvent <TKey> value)
{
switch (value.EventType)
{
case DictionaryEventType.Add:
OnAdd(value.Key);
break;
case DictionaryEventType.Remove:
OnRemove(value.Key);
break;
case DictionaryEventType.Update:
OnUpdate(value.Key);
break;
}
}
/// <summary>
/// 通知观察者合集即将进行更新操作;
/// </summary>
private void NotifyUpdate(TKey key, MapNode originalValue, MapNode newValue)
{
var changeContents = MapNode.GetNodeChangeElements(originalValue, newValue);
if (changeContents > 0)
{
MapEvent <TKey> mapEvent = new MapEvent <TKey>()
{
Map = this,
EventType = DictionaryEventType.Update,
Key = key,
OriginalValue = originalValue,
NewValue = newValue,
ChangeContents = changeContents,
};
observers.NotifyNext(mapEvent);
}
}
