code: public Datatype.Builder setBuilderFactory(BuilderFactory builderFactory) {
      this.builderFactory = Objects.requireNonNull(builderFactory);
      return (Datatype.Builder) this;
    }
docs: Sets the value to be returned by {@link Datatype#getBuilderFactory()}.
  
  @return this {@code Builder} object
  @throws NullPointerException if {@code builderFactory} is null