public virtual TValue GetNearest <T>(T key)
{
IAvlLeaf <TKey, TValue> leaf = Root;
IAvlLeaf <TKey, TValue> last = null;
var compareKey = (TKey)Convert.ChangeType(key, typeof(TKey));
while (leaf != null)
{
if (leaf.GreaterThan(compareKey))
{
leaf = leaf.Left;
}
else if (leaf.LessThan(compareKey))
{
last = leaf;
leaf = leaf.Right;
}
else
{
return(leaf.Value);
}
}
if (last.IsEmpty())
{
return(GetMaxLeaf().Value);
}
else
{
return(last.Value);
}
}
protected virtual IAvlLeaf <TKey, TValue> Insert(IAvlLeaf <TKey, TValue> root, IAvlLeaf <TKey, TValue> leaf,
ref bool done)
{
if (root.IsEmpty())
{
root = leaf;
}
else
{
leaf.Parent = root;
var direction = leaf.GreaterThan(root.Key);
root[direction] = Insert(root[direction], leaf, ref done);
if (!done)
{
root.Balance += direction ? 1 : -1;
if (root.Balance == 0)
{
done = true;
}
else if (Math.Abs(root.Balance) > 1)
{
root = BalancePostInsert(root, direction);
done = true;
}
}
}
return(root);
}