code: private static boolean deepEmpty(final String[] strings) {
          if (strings != null) {
              for (final String s : strings) {
                  if (StringUtils.isNotEmpty(s)) {
                      return false;
                  }
              }
          }
          return true;
      }
docs: Determines whether or not all the Strings in an array are
  empty or not.
  
  @param strings String[] whose elements are being checked for emptiness
  @return whether or not the String is empty