code: private void validateAttributes() {
      if (content == null) {
        throw new NullContentException("RendererBuilder needs content to create Renderer instances");
      }
  
      if (parent == null) {
        throw new NullParentException("RendererBuilder needs a parent to inflate Renderer instances");
      }
  
      if (layoutInflater == null) {
        throw new NullLayoutInflaterException(
            "RendererBuilder needs a LayoutInflater to inflate Renderer instances");
      }
    }
docs: Throws one RendererException if the content parent or layoutInflater are null.