Method copyColor

src/java/org/apache/poi/util/BinaryTree.java:574–589

copy the color from one node to another, dealing with the fact that one or both nodes may, in fact, be null @param from the node whose color we're copying; may be null @param to the node whose color we're changing; may be null @param index _KEY or _VALUE

(Node from, Node to, int index)

     * @param index _KEY or _VALUE
     */
    private static void copyColor(Node from, Node to, int index)
    {
        if (to != null)
        {
            if (from == null)
            {

                // by default, make it black
                to.setBlack(index);
            }
            else
            {
                to.copyColor(from, index);
            }
        }
    }

    /**
     * is the specified node red? if the node does not exist, no, it's