class OrderByColumn implements OrderBy {

    @Nullable
    @Override
    public final String getOrderByPredicate() {
        if (!TextUtils.isEmpty(mSortByColumn)) {
            return mSortByColumn + ((mIsDescending) ? " DESC" : " ASC");
        } else {
            return null;
        }
    }

    public  OrderByColumn(@Nullable String sortByColumn, boolean isDescending);

}