code: public Observable<Page<SharedAccessAuthorizationRuleResourceInner>> listAuthorizationRulesAsync(final String resourceGroupName, final String namespaceName, final String notificationHubName) {
          return listAuthorizationRulesWithServiceResponseAsync(resourceGroupName, namespaceName, notificationHubName)
              .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 resourceGroupName The name of the resource group.
  @param namespaceName The namespace name
  @param notificationHubName The notification hub name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;SharedAccessAuthorizationRuleResourceInner&gt; object