code: public void setActionSequence (String action)
      {
          // sanity check
          if (action == null) {
              log.warning("Refusing to set null action sequence " + this + ".", new Exception());
              return;
          }
  
          // no need to noop
          if (action.equals(_action)) {
              return;
          }
          _action = action;
          updateActionFrames();
      }
docs: Sets the action sequence used when rendering the character, from the set of available
  sequences.