code: public static void serializeCopyEntity(State state, CopyEntity copyEntity) {
      state.setProp(SERIALIZED_COPYABLE_FILE, CopyEntity.serialize(copyEntity));
      state.setProp(COPY_ENTITY_CLASS, copyEntity.getClass().getName());
    }
docs: Serialize a {@link List} of {@link CopyEntity}s into a {@link State} at {@link #SERIALIZED_COPYABLE_FILE}