private String participantsToString(){
  StringBuilder sb=new StringBuilder();
  for (  String participantByUrl : participantsByUrl.keySet()) {
    SessionParticipant sp=participantsByUrl.get(participantByUrl);
    if (sb.length() > 0) {
      sb.append(" , ");
    }
    sb.append(sp.toString());
  }
  return sb.toString();
}

private String participantsToString ( ) { StringBuilder sb = new StringBuilder ( ) ; for ( String participantByUrl : participantsByUrl . keySet ( ) ) { SessionParticipant sp = participantsByUrl . get ( participantByUrl ) ; if ( sb . length ( ) > 0 ) { sb . append ( " , " ) ; } sb . append ( sp . toString ( ) ) ; } return sb . toString ( ) ; }
return string representation of participants
