/**
   * 更新新菜品分类
   *
   * @param categoryVO 菜品分类值对象,包含需要更新的数据
   * @return 更新后的菜品分类值对象
   * @throws DuplicateNameException 菜品分类命名重复异常
   * @throws CategoryNotFoundException 菜品分类不存在异常
   */
  @Transactional(
      propagation = Propagation.REQUIRED,
      readOnly = false,
      rollbackFor = Exception.class)
  public Category updateCategory(CategoryVO categoryVO)
      throws DuplicateNameException, CategoryNotFoundException {
    // 1. 检查需要更新的菜品分类是否存在
    Category category = this.getCategoryById(categoryVO.getId());

    Category checkedCategory = categoryDao.getCategoryByName(categoryVO.getName());
    // 2. 检查是否有同名菜品分类
    if (checkedCategory != null && checkedCategory.getId() != categoryVO.getId()) {
      throw new DuplicateNameException(
          MessageUtil.getMessage("category_name_msg", categoryVO.getName()));
    } else {
      // 3. 更新菜品分类
      category.setName(categoryVO.getName());
      category.setPicPath(categoryVO.getPicPath());
      category.setUpdateDate(new Date());

      categoryDao.update(category);
    }

    return category;
  }
 /**
  * 更新功能
  *
  * @return
  */
 public String update() {
   try {
     // 1. 检查传入的会员等级属性是否合法
     if (!checkCategoryVO()) {
       return ERROR;
     } else {
       // 2. 更新新的会员等级
       categoryService.updateCategory(category);
       setMessage(MessageUtil.getMessage("category_update_success", category.getName()));
       category = new CategoryVO();
     }
   } catch (DuplicateNameException e) {
     this.setMessage(e.getMessage());
     return ERROR;
   } catch (CategoryNotFoundException e) {
     this.setMessage(e.getMessage());
     return ERROR;
   } catch (NumberFormatException e) {
     this.setMessage(e.getMessage());
     return ERROR;
   } finally {
     getCategoryList();
     refreshPageData();
   }
   return SUCCESS;
 }
  /**
   * 添加新菜品分类
   *
   * @param categoryVO 菜品分类值对象
   * @return 新创建的菜品分类对象
   * @throws DuplicateNameException 菜品分类命名重复异常
   */
  @Transactional(
      propagation = Propagation.REQUIRED,
      readOnly = false,
      rollbackFor = Exception.class)
  public Category addCategory(CategoryVO categoryVO) throws DuplicateNameException {
    Category category = null;

    // 1. 检查是否有同名菜品分类
    if (null == categoryDao.getCategoryByName(categoryVO.getName())) {
      category = new Category();
      category.setName(categoryVO.getName());
      category.setPicPath(categoryVO.getPicPath());
      category.setCreateDate(new Date());
      Long categoryId = categoryDao.save(category);
      category = categoryDao.get(categoryId);
    } else {
      throw new DuplicateNameException(
          MessageUtil.getMessage("category_name_msg", categoryVO.getName()));
    }

    return category;
  }
  /** 检查一个菜品的设定是否合法 */
  private boolean checkCategoryVO() {
    boolean isValidVO = true;

    if (null == category) {
      isValidVO = false;
      addFieldError("category.categoryvo", MessageUtil.getMessage("category_invalid_vo"));
      return isValidVO;
    }

    if (StringUtil.isEmpty(category.getName())) {
      isValidVO = false;
      addFieldError("category.name", MessageUtil.getMessage("category_name_rule"));
    } else {
      category.setName(category.getName());
    }

    if (StringUtil.isEmpty(category.getPicPath())) {
      isValidVO = false;
      addFieldError("category.pic.path", MessageUtil.getMessage("pic_path_rule"));
    }

    return isValidVO;
  }
  /**
   * 添加新会员等级Action
   *
   * @return
   */
  public String save() {
    logger.debug(category);
    try {
      // 1. 检查传入的会员等级属性是否合法
      if (!checkCategoryVO()) {
        return ERROR;
      } else {
        // 2. 创建新的会员等级
        categoryService.addCategory(category);
        setMessage(MessageUtil.getMessage("category_save_success", category.getName()));
        category = new CategoryVO();
      }
    } catch (DuplicateNameException e) {
      logger.error(e.getMessage());
      this.setMessage(e.getMessage());
      return ERROR;
    } finally {
      getCategoryList();
      refreshPageData();
    }

    return SUCCESS;
  }