private Mono validateIsolation()

in cloud-spanner-r2dbc/src/main/java/com/google/cloud/spanner/r2dbc/v2/SpannerClientLibraryConnection.java [185:193]

• 9 lines of code
• 3 McCabe index (conditional complexity)

  private Mono<Void> validateIsolation(IsolationLevel isolationLevel) {
    if (isolationLevel == null) {
      return Mono.error(new IllegalArgumentException("IsolationLevel can't be null."));
    }
    return isolationLevel == SERIALIZABLE ? Mono.empty()
        : Mono.error(new UnsupportedOperationException(
            String.format("Unsupported '%s' isolation level, Only SERIALIZABLE is supported.",
                isolationLevel.asSql())));
  }