public V Put(V value, params K[] cascadedKeys)
{
if (value == null)
{
return(Remove(cascadedKeys));
}
if (cascadedKeys == null || cascadedKeys.Length == 0)
{
throw new ArgumentException("cascadedKeys is null or empty");
}
lock (_lock)
{
CascadedKeyValuePairNode <K, V> node = GetOrAddNode(cascadedKeys);
CascadedKeyValuePair <K, V> pair = node.Pair;
V oldValue = pair == null ? default(V) : pair.Value;
if (pair == null)
{
pair = new CascadedKeyValuePair <K, V>(value, cascadedKeys);
node.Pair = pair;
Interlocked.Increment(ref _count);
}
else
{
pair.Value = value;
}
return(oldValue);
}
}
public V Remove(params K[] cascadedKeys)
{
if (cascadedKeys == null || cascadedKeys.Length == 0)
{
throw new ArgumentException("cascadedKeys is null or empty");
}
lock (_lock)
{
Stack <CascadedKeyValuePairNode <K, V> > nodes = new Stack <CascadedKeyValuePairNode <K, V> >();
nodes.Push(_rootNode);
CascadedKeyValuePairNode <K, V> node = _rootNode;
int i = 0;
foreach (K key in cascadedKeys)
{
node.Children.TryGetValue(key, out node);
if (node == null)
{
break;
}
nodes.Push(node);
i++;
}
V value = default(V);
if (i == cascadedKeys.Length)
{
node = nodes.Pop();
CascadedKeyValuePair <K, V> pair = node.Pair;
if (pair != null)
{
value = pair.Value;
Interlocked.Decrement(ref _count);
}
if (!node.Children.IsEmpty)
{
node.Pair = null;
return(value);
}
nodes.Peek().Children.TryRemove(node.Key, out node);
}
for (node = nodes.Pop(); node != _rootNode; node = nodes.Pop())
{
if (node.Pair == null && node.Children.IsEmpty)
{
nodes.Peek().Children.TryRemove(node.Key, out node);
}
}
return(value);
}
}
public V Get(params K[] cascadedKeys)
{
if (cascadedKeys == null || cascadedKeys.Length == 0)
{
throw new ArgumentException("cascadedKeys is null or empty");
}
CascadedKeyValuePairNode <K, V> node = GetNode(cascadedKeys);
if (node == null)
{
return(default(V));
}
CascadedKeyValuePair <K, V> pair = node.Pair;
return(pair == null ? default(V) : pair.Value);
}
public V GetOrAdd(Func <K[], V> valueFacTory, params K[] cascadedKeys)
{
if (valueFacTory == null)
{
throw new ArgumentNullException("valueFacTory is null");
}
if (cascadedKeys == null || cascadedKeys.Length == 0)
{
throw new ArgumentException("cascadedKeys is null or empty");
}
V value = Get(cascadedKeys);
if (value != null)
{
return(value);
}
lock (_lock)
{
CascadedKeyValuePairNode <K, V> node = GetOrAddNode(cascadedKeys);
CascadedKeyValuePair <K, V> pair = node.Pair;
if (pair != null)
{
return(pair.Value);
}
value = valueFacTory(cascadedKeys);
if (value == null)
{
throw new ArgumentException("valueFacTory return null");
}
pair = new CascadedKeyValuePair <K, V>(value, cascadedKeys);
node.Pair = pair;
Interlocked.Increment(ref _count);
return(value);
}
}