JAVA策略方法

策略模式太过麻烦，所以记下策略方法。

一、策略方法

//Service  Map容器
 private final ConcurrentHashMap<BQSQueryDataRequestEnum, Function<Person, Result>> requestMap = new ConcurrentHashMap<>();

   @PostConstruct
    public void init() {
        //增加三个元素
        requestMap.put(BQSQueryDataRequestEnum.AA, person -> this.aa(person));
        requestMap.put(BQSQueryDataRequestEnum.BB, person -> this.bb(person));
        requestMap.put(BQSQueryDataRequestEnum.CC, person -> this.cc(person));

    }
   //控制层只调用这个方法，根据不同的枚举type，选择调用aa，bb，cc方法。
   @Override
    public Result queryData(Person person, String type) {
        return requestMap.get(BQSQueryDataRequestEnum.getEnumByValue(type)).apply(person);
    }

    private Result aa(Person person) {
       return new Result();
    }
    private Result bb(Person person) {
       return new Result();
    }
    private Result cc(Person person) {
       return new Result();
    }

public enum BQSQueryDataRequestEnum {

    aa("XY_BQS_TSSB", "a方法"),
    bb("XY_BQS_DCTJ", "b方法"),
    cc("XY_BQS_FZWL", "c方法");

    BQSQueryDataRequestEnum() {
    }

    @Getter
    private String value;
    @Getter
    private String desc;

    BQSQueryDataRequestEnum(String value, String desc) {
        this.value = value;
        this.desc = desc;
    }

    /**
     * 根据value获取enum
     *
     * @param value
     * @return
     */
    public static BQSQueryDataRequestEnum getEnumByValue(String value) {
        if (Objects.isNull(value)) {
            throw new MetaException(MetaErrorEnum.MissingRequiredParameter, "接口请求方式为空！");
        }
        Stream<BQSQueryDataRequestEnum> enumStream = Stream.of(BQSQueryDataRequestEnum.values());
        if (!enumStream.anyMatch(s -> Objects.equals(s.getValue(), value))) {
            throw new MetaException(MetaErrorEnum.MissingRequiredParameter, "接口请求方式参数错误！");
        }
        return Stream.of(BQSQueryDataRequestEnum.values()).filter(s -> Objects.equals(value, s.getValue())).findFirst().get();
    }
}