/// <summary>
/// Clears the tree.
/// </summary>
public void Clear()
{
this.root = null;
}
/// <summary>
/// Adjusts the balance factors for affected tree nodes.
/// </summary>
private void InsertBalanceTree(AVLNode<TKey, TValue> node, int addBalance)
{
while (node != null)
{
//Add the new balance value to the current node balance.
node.Balance += addBalance;
/*
* If the balance was -1 or +1, the tree is still balanced so
* we don't have to balanced it further
*/
if (node.Balance == 0)
{
break;
}
//If the height(left-subtree) - height(right-subtree) == 2
else if (node.Balance == 2)
{
if (node.LeftChild.Balance == 1)
{
RotateLeftLeft(node);
}
else
{
RotateLeftRight(node);
}
break;
}
//If the height(left-subtree) - height(right-subtree) == -2
else if (node.Balance == -2)
{
if (node.RightChild.Balance == -1)
{
RotateRightRight(node);
}
else
{
RotateRightLeft(node);
}
break;
}
if (node.Parent != null)
{
/*
* If the current node is the left child of the parent node
* we need to increase the height of the parent node.
* */
if (node.Parent.LeftChild == node)
{
addBalance = 1;
}
/*
* If it is the right child,
* we decrease the height of the parent node
* */
else
{
addBalance = -1;
}
}
node = node.Parent;
}
}
public AVLTree()
{
this.root = null;
}