private void updateNAC(String nac){
  if (mNAC == null || (nac != null && !mNAC.contentEquals(nac))) {
    mNAC=nac;
    broadcast(ChangedAttribute.NAC);
  }
}

private void updateNAC ( String nac ) { if ( mNAC == null || ( nac != null && ! mNAC . contentEquals ( nac ) ) ) { mNAC = nac ; broadcast ( ChangedAttribute . NAC ) ; } }
broadcasts an update to the nac
