Method getGrandParent

src/java/org/apache/poi/util/BinaryTree.java:650–653

get a node's grandparent. mind you, the node, its parent, or its grandparent may not exist. no problem @param node the node (may be null) in question @param index _KEY or _VALUE

(Node node, int index)

     * @param index _KEY or _VALUE
     */
    private static Node getGrandParent(Node node, int index)
    {
        return getParent(getParent(node, index), index);
    }

    /**
     * get a node's parent. mind you, the node, or its parent, may not