/** From CLR **/
private RBCell fixAfterDeletion(RBCell rootValue)
{
RBCell x = this;
while (x != rootValue && colorOf(x))
{
if (x == leftOf(parentOf(x)))
{
RBCell sib = rightOf(parentOf(x));
if (!colorOf(sib))
{
setColor(sib, BLACK);
setColor(parentOf(x), RED);
rootValue = parentOf(x).rotateLeft(rootValue);
sib = rightOf(parentOf(x));
}
if (colorOf(leftOf(sib)) && colorOf(rightOf(sib)))
{
setColor(sib, RED);
x = parentOf(x);
}
else
{
if (colorOf(rightOf(sib)))
{
setColor(leftOf(sib), BLACK);
setColor(sib, RED);
rootValue = sib.rotateRight(rootValue);
sib = rightOf(parentOf(x));
}
setColor(sib, colorOf(parentOf(x)));
setColor(parentOf(x), BLACK);
setColor(rightOf(sib), BLACK);
rootValue = parentOf(x).rotateLeft(rootValue);
x = rootValue;
}
}
else // symmetric
{
RBCell sib = leftOf(parentOf(x));
if (!colorOf(sib))
{
setColor(sib, BLACK);
setColor(parentOf(x), RED);
rootValue = parentOf(x).rotateRight(rootValue);
sib = leftOf(parentOf(x));
}
if (colorOf(rightOf(sib)) && colorOf(leftOf(sib)))
{
setColor(sib, RED);
x = parentOf(x);
}
else
{
if (colorOf(leftOf(sib)))
{
setColor(rightOf(sib), BLACK);
setColor(sib, RED);
rootValue = sib.rotateLeft(rootValue);
sib = leftOf(parentOf(x));
}
setColor(sib, colorOf(parentOf(x)));
setColor(parentOf(x), BLACK);
setColor(leftOf(sib), BLACK);
rootValue = parentOf(x).rotateRight(rootValue);
x = rootValue;
}
}
}
setColor(x, BLACK);
return(rootValue);
}
/** From CLR **/ private RBCell fixAfterInsertion(RBCell rootValue)
{
this.colorValue = RED;
RBCell x = this;
while (x != null && x != rootValue && !x.parentValue.colorValue)
{
if (parentOf(x) == leftOf(parentOf(parentOf(x))))
{
RBCell y = rightOf(parentOf(parentOf(x)));
if (!colorOf(y))
{
setColor(parentOf(x), BLACK);
setColor(y, BLACK);
setColor(parentOf(parentOf(x)), RED);
x = parentOf(parentOf(x));
}
else
{
if (x == rightOf(parentOf(x)))
{
x = parentOf(x);
rootValue = x.rotateLeft(rootValue);
}
setColor(parentOf(x), BLACK);
setColor(parentOf(parentOf(x)), RED);
if (parentOf(parentOf(x)) != null)
{
rootValue = parentOf(parentOf(x)).rotateRight(rootValue);
}
}
}
else
{
RBCell y = leftOf(parentOf(parentOf(x)));
if (!colorOf(y))
{
setColor(parentOf(x), BLACK);
setColor(y, BLACK);
setColor(parentOf(parentOf(x)), RED);
x = parentOf(parentOf(x));
}
else
{
if (x == leftOf(parentOf(x)))
{
x = parentOf(x);
rootValue = x.rotateRight(rootValue);
}
setColor(parentOf(x), BLACK);
setColor(parentOf(parentOf(x)), RED);
if (parentOf(parentOf(x)) != null)
{
rootValue = parentOf(parentOf(x)).rotateLeft(rootValue);
}
}
}
}
rootValue.colorValue = BLACK;
return(rootValue);
}