code: @Nonnull
    public IFileItemIterator getItemIterator (@Nonnull final IRequestContext aCtx) throws FileUploadException, IOException
    {
      return new FileItemIterator (aCtx);
    }
docs: Processes an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>
  compliant <code>multipart/form-data</code> stream.
  
  @param aCtx
  The context for the request to be parsed.
  @return An iterator to instances of <code>FileItemStream</code> parsed from
  the request, in the order that they were transmitted.
  @throws FileUploadException
  if there are problems reading/parsing the request or storing files.
  @throws IOException
  An I/O error occurred. This may be a network error while
  communicating with the client or a problem while storing the
  uploaded content.