docs: private void fromInput(List<FileModel> vertices, GraphRewrite event)
      {
          if (vertices.isEmpty() && StringUtils.isNotBlank(getInputVariablesName()))
          {
              for (WindupVertexFrame windupVertexFrame : Variables.instance(event).findVariable(getInputVariablesName()))
              {
                  if (windupVertexFrame instanceof FileModel)
                      vertices.add((FileModel) windupVertexFrame);
                  if (windupVertexFrame instanceof FileReferenceModel)
                      vertices.add(((FileReferenceModel) windupVertexFrame).getFile());
              }
          }
      }