Fine-tuned tranform specs.

     * Compute how to transform this BST into the BST <code>otherTree</code> using rotations.

     *

     * @param otherTree The into which we seek to transform the current tree.

     * @expects The keys of this object are {@link #equals(Object)}} to the keys of <code>otherTree</code>

     *          in a one-to-one correspondence.

     * @return An ArrayList of rotations indicating which rotations around which nodes

     * must be performed to transform <first> into <second.

     */

    public ArrayList<BstRotation> transformTo(BST otherTree) {

    public ArrayList<BstRotation<keyType> > transformTo(BST<keyType> otherTree) {

        throw new UnsupportedOperationException("This method should be properly implemented in a subclass.");

    }

    /**

     * Static version of {@link #transformTo(BST)}.

     * Only transforms a BST to another BST of the same key type.

     */

    public static ArrayList transform(BST firstTree, BST secondTree) {

    public static <oneKeyType extends Comparable<oneKeyType> > ArrayList

        transform(BST<oneKeyType> firstTree, BST<oneKeyType> secondTree) {

        return firstTree.transformTo(secondTree);

    }