code: public static BoxAPIConnection restore(String clientID, String clientSecret, String state) {
          BoxAPIConnection api = new BoxAPIConnection(clientID, clientSecret);
          api.restore(state);
          return api;
      }
docs: Restores a BoxAPIConnection from a saved state.
  
  @see    #save
  @param  clientID     the client ID to use with the connection.
  @param  clientSecret the client secret to use with the connection.
  @param  state        the saved state that was created with {@link #save}.
  @return              a restored API connection.