java - 如何在 easy-rules 中编写规则，该规则接受字符串数组并使用 contains 检查事实字符串？

Question

我正在使用表达式语言支持使用 easy-rules 以 json 格式编写规则。

MVELRuleFactory ruleFactory = new MVELRuleFactory(new JsonRuleDefinitionReader())
Rules rules = ruleFactory.createRules(new FileReader("user-role-rule.json"))

2条规则

1. 部门包含“gas”&&(标题包含“主管”|| 标题包含“经理”)

2. dept 包含任何 ["gas"、"ges"、"ips"、"csa"、"sales - 云续订"] 值

注意:dept =“SALES - CLOUD RENEWAL”或“SALES US CLOUD RENEWAL”

用户角色规则.json

[
    {
        "name": "account",
        "description": "User in gas department having either Director or Manager title",
        "priority": 1,
        "condition": "user.getDept().toLowerCase().contains(\"gas\") && (user.getTitle().toLowerCase().contains(\"director\") || user.getTitle().toLowerCase().contains(\"manager\"))",
        "actions": [
          "user.setRole(\"account\");"
        ]
  },
  {
    "name": "account_common",
    "description": "User in CSM, IPS, CSA, SALES - CLOUD ENTERPRISE or GES department irrespective of any title",
    "priority": 1,
    "condition": "for (String dep in [\"gas\",\"ges\",\"ips\",\"csa\",\"sales - cloud renewal\"]) {user.getDept().toLowerCase().contains(dep)}",
    "actions": [
      "user.setRole(\"account\");"
    ]
  }
]

用户pojo类

class User {
    String userId
    String dept
    String title
    List<String> role

    User(String userId, String dept, String title) {
        this.userId = userId
        this.dept = dept
        this.title = title
        this.role = new ArrayList<String>()
    }
    //..ommitting getter setters
}

这里，名称为“account”的第一条规则工作正常，但在第二条规则中，我想使用属于 ["gas","ges","ips","csa", “销售-云续约”]值(value)观。

示例部门值为“SALES - CLOUD RENEWAL”或“SALES US CLOUD RENEWAL”

第二条规则的异常(exception)

Exception in thread "main" [Error: expected : in foreach]
[Near : {... es - cloud renewal"]) {user.getDept().toLowerCase( ....}]
                                 ^

Answer 1

正如错误所述，您应该在 foreach 中使用冒号字符 : 而不是 in。只需将第二条规则的条件写成如下即可:

"condition": "for (String dep : [\"gcs\", ..., \"sales - cloud renewal\"]) {user.getDept().toLowerCase().contains(dep)}"

您还可以查看the MVEL foreach documentation