public void addRslUrl(String url){
  if (url == null) {
    throw new NullPointerException("url may not be null");
  }
  rslUrls.add(url);
  addSignedFlag(isRslUrlSigned(url));
}

public void addRslUrl ( String url ) { if ( url == null ) { throw new NullPointerException ( "url may not be null" ) ; } rslUrls . add ( url ) ; addSignedFlag ( isRslUrlSigned ( url ) ) ; }
add an rsl to the list of rsls .
