code: public static CellModel getCellModel(JspContext jspContext) {
          Object model = jspContext.getAttribute(KEY_CELL_MODEL);
          assert model != null ? model instanceof CellModel : true;
          return (CellModel)model;
      }
docs: Get the {@link CellModel} instance from the {@link JspContext} using the
  {@link #KEY_CELL_MODEL} as the key.
  @param jspContext the jsp context
  @return the {@link CellModel} if one is found