private static ImmutableDictionary <TKey, TValue> From(TKey key, TValue value, uint hash, int shift, TKey key2, TValue value2)
{
if (hash == (uint)key2.GetHashCode() && key.Equals(key2))
{
// TODO lift hash and key equlity (update) to above layer
var newValues = new ValueNode1 <TKey, TValue>(key, value);
return(new BitMapNode <TKey, TValue, ValueNode1 <TKey, TValue> >(0, new ImmutableDictionary <TKey, TValue> [0], 1U << (int)((hash >> shift) & Mask), newValues));
}
else if (hash == (uint)key2.GetHashCode())
{
// TODO handle collisions, at what shift level?
throw new NotImplementedException();
}
else
{
var bit1 = 1U << (int)(((uint)key2.GetHashCode() >> shift) & Mask);
var bit2 = 1U << (int)((hash >> shift) & Mask);
if (bit1 < bit2)
{
var newValues = new ValueNode2 <TKey, TValue>(key2, value2, key, value);
return(new BitMapNode <TKey, TValue, ValueNode2 <TKey, TValue> >(0, new ImmutableDictionary <TKey, TValue> [0], bit1 | bit2, newValues));
}
else if (bit1 > bit2)
{
var newValues = new ValueNode2 <TKey, TValue>(key, value, key2, value2);
return(new BitMapNode <TKey, TValue, ValueNode2 <TKey, TValue> >(0, new ImmutableDictionary <TKey, TValue> [0], bit1 | bit2, newValues));
}
else
{
var newNodes = BitMapNode <TKey, TValue, TValues> .From(key, value, hash, shift + Shift, key2, value2);
return(new BitMapNode <TKey, TValue, ValueNode0 <TKey, TValue> >(bit1, new [] { newNodes }, 0, new ValueNode0 <TKey, TValue>()));
}
}
}
internal override ImmutableDictionary <TKey, TValue> Add(TKey key, TValue value, uint hash, int shift)
{
var bit = 1U << (int)((hash >> shift) & Mask);
if ((_bitmapNodes & bit) != 0)
{
var newNodes = new ImmutableDictionary <TKey, TValue> [_nodes.Length];
Array.Copy(_nodes, newNodes, _nodes.Length);
var index = Popcnt.PopCount(_bitmapNodes & (bit - 1));
newNodes[index] = _nodes[index].Add(key, value, hash, shift + Shift);
return(new BitMapNode <TKey, TValue, TValues>(_bitmapNodes, newNodes, _bitmapValues, _values));
}
else if ((_bitmapValues & bit) != 0)
{
// TODO collisions and same value
var newNodes = new ImmutableDictionary <TKey, TValue> [_nodes.Length + 1];
var index = Popcnt.PopCount(_bitmapNodes & (bit - 1));
Array.Copy(_nodes, newNodes, index);
Array.Copy(_nodes, index, newNodes, index + 1, _nodes.Length - index);
var indexValues = Popcnt.PopCount(_bitmapValues & (bit - 1));
var key2 = _values.GetKey(indexValues);
var value2 = _values.GetValue(indexValues);
newNodes[index] = BitMapNode <TKey, TValue, TValues> .From(key, value, hash, shift + Shift, key2, value2);
return(_values.Shrink(_bitmapNodes | bit, newNodes, _bitmapValues ^ bit, (uint)indexValues));
}
else
{
var index = (uint)Popcnt.PopCount(_bitmapValues & (bit - 1));
return(_values.Add(key, value, _bitmapNodes, _nodes, _bitmapValues | bit, index));
}
}
