code: public Observable<Page<SasTokenInfoInner>> listSasTokensNextAsync(final String nextPageLink) {
          return listSasTokensNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<SasTokenInfoInner>>, Page<SasTokenInfoInner>>() {
                  @Override
                  public Page<SasTokenInfoInner> call(ServiceResponse<Page<SasTokenInfoInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets the SAS token associated with the specified Data Lake Analytics and Azure Storage account and container combination.
  
  @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;SasTokenInfoInner&gt; object