mybatis-plus判断参数是否为空并作为查询条件方式

@Override
    public Page<DemandEntity> selectByDepartmentDisplay(DemandEntity demandEntity) {
        EntityWrapper<DemandEntity> wrapper = new EntityWrapper<DemandEntity>();
        wrapper.eq(!StringUtils.isNullOrEmpty(demandEntity.getNameDemandDepartmentDispaly()),"name_demand_department_dispaly",demandEntity.getNameDemandDepartmentDispaly());
        Page<DemandEntity> demandEntityPage = this.selectPage(demandEntity.getPages(),wrapper);
        return demandEntityPage;
    }

！StringUtils.isNullOrEmpty(demandEntity.getNameDemandDepartmentDispaly()

 eq(boolean condition, R column, Object val)      

	/**
     * 判断对象或对象数组中每一个对象是否为空: 对象为null，字符序列长度为0，集合类、Map为empty
     *
     * @param obj
     * @return
     */
    public static boolean isNullOrEmpty(Object obj) { 
        if (obj == null) return true; 
        if (obj instanceof CharSequence) return ((CharSequence) obj).length() == 0; 
        if (obj instanceof Collection) return ((Collection) obj).isEmpty(); 
        if (obj instanceof Map) return ((Map) obj).isEmpty(); 
        if (obj instanceof Object[]) {
            Object[] object = (Object[]) obj;
            if (object.length == 0) {
                return true;
            }
            boolean empty = true;
            for (int i = 0; i < object.length; i++) {
                if (!isNullOrEmpty(object[i])) {
                    empty = false;
                    break;
                }
            }
            return empty;
        } 
        return false;
    }

eq(R column, Object val)
eq(boolean condition, R column, Object val)