code: @Override
    public Collection<Realm> getRealms(String realmName) {
      RealmSet set = this.realmNameToRealmSet.get(realmName);
      if (set != null) {
        Collection<Realm> present = set.values();
        return new ArrayList<Realm>(present);
      }
      return new ArrayList<Realm>(0);
    }
docs: /*
  (non-Javadoc)
  @see org.jdiameter.client.api.controller.IRealmTable#getRealms(java.lang.String)