code: public Observable<Page<SharedAccessAuthorizationRuleResourceInner>> listAuthorizationRulesNextAsync(final String nextPageLink) {
          return listAuthorizationRulesNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<SharedAccessAuthorizationRuleResourceInner>>, Page<SharedAccessAuthorizationRuleResourceInner>>() {
                  @Override
                  public Page<SharedAccessAuthorizationRuleResourceInner> call(ServiceResponse<Page<SharedAccessAuthorizationRuleResourceInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets the authorization rules for a NotificationHub.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;SharedAccessAuthorizationRuleResourceInner&gt; object