internal LeafNode HigherNode(uint key)
{
XFastNode ancestor = Bottom(key);
if (ancestor == null)
{
return(null);
}
LeafNode leaf = ancestor.left as LeafNode;
if (leaf != null && leaf.key > key)
{
return(leaf);
}
leaf = ancestor.right as LeafNode;
if (leaf != null && leaf.key > key)
{
return(leaf);
}
leaf = ancestor.right.right as LeafNode;
if (leaf != null && leaf.key > key)
{
return(leaf);
}
return(null);
}
private void InsertLeafAfter(XFastNode marker, LeafNode newLeaf)
{
if (marker == null)
{
if (leafList == null)
{
leafList = newLeaf;
newLeaf.left = newLeaf;
newLeaf.right = newLeaf;
}
else
{
XFastNode rightNode = leafList;
leafList.left.right = newLeaf;
newLeaf.left = leafList.left;
newLeaf.right = leafList;
leafList.left = newLeaf;
leafList = newLeaf;
}
}
else
{
XFastNode rightNode = marker.right;
marker.right = newLeaf;
newLeaf.left = marker;
newLeaf.right = rightNode;
rightNode.left = newLeaf;
}
}
private XFastNode Bottom(uint key)
{
int l = 0;
int h = width;
XFastNode tempNode;
XFastNode correctNode = null;
do
{
int j = (l + h) / 2;
uint ancestor = key >> (width - 1 - j) >> 1;
if (table[j].TryGetValue(ancestor, out tempNode))
{
l = j + 1;
correctNode = tempNode;
}
else
{
h = j;
}
}while (l < h);
return(correctNode);
}
private LeafNode LowerNodeFromBottom(XFastNode bottom, uint key)
{
if (bottom == null)
{
return(null);
}
LeafNode leaf = bottom.right as LeafNode;
if (leaf != null && leaf.key < key)
{
return(leaf);
}
leaf = bottom.left as LeafNode;
if (leaf != null && leaf.key < key)
{
return(leaf);
}
leaf = bottom.left.left as LeafNode;
if (leaf != null && leaf.key < key)
{
return(leaf);
}
return(null);
}
public override bool Remove(uint key)
{
var bottom = Bottom(key);
if (bottom == null)
{
return(false);
}
// get the leaf node in endNode
LeafNode endNode = bottom.left as LeafNode;
if (endNode == null || endNode.key != key)
{
endNode = bottom.right as LeafNode;
if (endNode == null || endNode.key != key)
{
return(false);
}
}
// get pointers to node elft and right from endNode
XFastNode leftLeaf = endNode.left;
XFastNode rightLeaf = endNode.right;
// remove bottom node from the table and leaf node from the list
//table[width - 1].Remove(key >> 1);
RemoveLeaf(endNode);
// iterate levels
bool single = true;
for (int i = width - 1; i >= 0; i--)
{
XFastNode current;
uint id = key >> (width - 1 - i) >> 1;
bool isFromRight = ((key >> (width - 1 - i)) & 1) == 1;
table[i].TryGetValue(id, out current);
// remove the node
if (single)
{
if (isFromRight && (!(current.left is LeafNode) || (i == (width - 1) && ((LeafNode)current.left).key != key)))
{
current.right = leftLeaf;
single = false;
}
else if (!isFromRight && (!(current.right is LeafNode) || (i == (width - 1) && ((LeafNode)current.right).key != key)))
{
current.left = rightLeaf;
single = false;
}
else
{
table[i].Remove(id);
}
}
// fix jump pointers
else
{
if (current.left == endNode)
{
current.left = rightLeaf;
}
else if (current.right == endNode)
{
current.right = leftLeaf;
}
}
}
count--;
version++;
return(true);
}
private void AddChecked(uint key, T value, bool overwrite)
{
// Insert node in linked list
XFastNode bottom = Bottom(key);
LeafNode predecessor = LowerNodeFromBottom(bottom, key);
// check for overwrite
LeafNode predRight;
if (predecessor != null)
{
predRight = (LeafNode)predecessor.right;
}
else
{
predRight = leafList;
}
if (predRight != null && predRight.key == key)
{
if (!overwrite)
{
throw new ArgumentException();
}
else
{
predRight.value = value;
return;
}
}
count++;
version++;
// merrily continue
LeafNode endNode = new LeafNode()
{
key = key, value = value
};
InsertLeafAfter(predecessor, endNode);
// Fix the jump path
if (bottom == null)
{
bottom = new XFastNode();
table[0].Add(0, bottom);
bottom.left = endNode;
bottom.right = endNode;
}
XFastNode oldNode = null;
XFastNode current;
for (int i = 0; i < width; i++)
{
uint id = key >> (width - 1 - i) >> 1;
if (table[i].TryGetValue(id, out current))
{
// fix the jump path
LeafNode leaf = current.left as LeafNode;
if (leaf != null && leaf.key > key)
{
current.left = endNode;
}
else
{
leaf = current.right as LeafNode;
if (leaf != null && leaf.key < key)
{
current.right = endNode;
}
}
}
else
{
// insert new node
current = new XFastNode()
{
left = endNode, right = endNode
};
table[i].Add(id, current);
// fix link between old and new node
if ((id & 1) > 0)
{
oldNode.right = current;
}
else
{
oldNode.left = current;
}
}
oldNode = current;
}
}
internal LeafNode LowerNode(uint key)
{
XFastNode ancestor = Bottom(key);
return(LowerNodeFromBottom(ancestor, key));
}