@Override
 public Attachment to(UriInfo uriInfo, AttachmentRepresentation representation) {
   Attachment attachment =
       new Attachment(
           representation.getTitle(), representation.getMimeType(), representation.getUrl());
   return attachment;
 }
 @Override
 public Attachment update(
     UriInfo uriInfo, AttachmentRepresentation representation, Attachment target) {
   target.setTitle(representation.getTitle());
   target.setMimeType(representation.getMimeType());
   target.setUrl(representation.getUrl());
   return target;
 }