How to get primary attachment file in the CheckinObjectFormProcessor?

Hi!

I need to customize CheckinObjectFormProcessor. I need to get primary attached file that user insert in the checkin wizard. I've created my own CIObjectFormprocessor that extended OOTB CheckinObjectFormProcessor:

public class CIObjectFormProcessor extends CheckinObjectFormProcessor

{

  public FormResult doOperation(NmCommandBean paramNmCommandBean, List<ObjectBean> paramList) throws WTException

  {

     FormResult localFormResult = new FormResult();

     localFormResult.setStatus(FormProcessingStatus.SUCCESS);

      // Need there to get new primary attachment file

     localFormResult = super.doOperation(paramNmCommandBean, paramList);

     return localFormResult;

  }

}

localObjectBean.getParameterMap() can give me the Map with a lot of properties. But I can't to get the file I need. Please help.