///<summary>
///Set parent node
///</summary>
internal override void SetParent(RBTreeNodeBase <T, RBOrderedNodeParam> value)
{
mParent = value;
if (mParent != null)
{
mParent.OnUpdateCount();
}
}
///<summary>
/// Rotate our tree Right
///
/// X Y
/// / \ / \
/// A Y <---rb_right_rotate(Y) X C
/// / \ / \
/// B C A B
///
/// N.B. This does not change the ordering.
///
/// We assume that neither X or Y is NULL
///<summary>
protected void RightRotate(RBTreeNodeBase <T, P> y)
{
RBTreeNodeBase <T, P> x;
// set X
x = y.mLeft;
// Turn X's right subtree into Y's left subtree (move B)
y.mLeft = x.mRight;
// If B is not null, set it's parent to be Y
if (x.mRight != null)
{
x.mRight.mParent = y;
}
// Set X's parent to be what Y's parent was
x.mParent = y.mParent;
// if Y was the root
if (y.mParent == null)
{
mRoot = x;
}
else
{
// Set Y's parent's left or right pointer to be X
if (y == y.mParent.mLeft)
{
y.mParent.mLeft = x;
}
else
{
y.mParent.mRight = x;
}
}
// Put Y on X's right
x.mRight = y;
// Set Y's parent to be X
y.mParent = x;
y.OnUpdateCount();
}
///<summary>
/// Rotate our tree Left
///
/// X rb_left_rotate(X)---> Y
/// / \ / \
/// A Y X C
/// / \ / \
/// B C A B
///
/// N.B. This does not change the ordering.
///
/// We assume that neither X or Y is NULL
///<summary>
protected void LeftRotate(RBTreeNodeBase <T, P> x)
{
RBTreeNodeBase <T, P> y;
// set Y
y = x.mRight;
// Turn Y's left subtree into X's right subtree (move B)
x.mRight = y.mLeft;
// If B is not null, set it's parent to be X
if (y.mLeft != null)
{
y.mLeft.mParent = x;
}
// Set Y's parent to be what X's parent was
y.mParent = x.mParent;
// if X was the root
if (x.mParent == null)
{
mRoot = y;
}
else
{
// Set X's parent's left or right pointer to be Y
if (x == x.mParent.mLeft)
{
x.mParent.mLeft = y;
}
else
{
x.mParent.mRight = y;
}
}
// Put X on Y's left
y.mLeft = x;
// Set X's parent to be Y
x.mParent = y;
x.OnUpdateCount();
}
