ENUM枚举类实战应用

前端页面查询条件为一个起止日期

前端传到后台直接为 今日 本周 本月 本年等汉字，后端需要查询必须把这些汉字转化为日期范围。
这种第一想到的是if(本周)
{}else if(本年)
{}
等，这样写很难维护代码，下面用枚举类来实现
下面用代码来实现。

import cn.hutool.core.date.DateTime;
import cn.hutool.core.date.DateUtil;


import java.time.ZoneId;
import java.util.Date;

public enum DateEnum implements DateRange {

    JR("今日"){

        public DateRangeQuery getTimeRange(String dataStr) {

            DateRangeQuery dateRangeQuery = new DateRangeQuery();
            Date date = DateUtil.date();
            Date beginOfDay = DateUtil.beginOfDay(date);

            dateRangeQuery.setTimeGe(beginOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());
            //一天的结束，
            Date endOfDay = DateUtil.endOfDay(date);
            dateRangeQuery.setTimeLe(endOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());
            return dateRangeQuery;
        }
    },
    BZ("本周"){

        public DateRangeQuery getTimeRange(String dataStr) {

            DateRangeQuery dateRangeQuery = new DateRangeQuery();
            Date date = DateUtil.date();
            Date beginOfDay = DateUtil.beginOfWeek(date);

            dateRangeQuery.setTimeGe(beginOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());

            Date endOfDay = DateUtil.endOfWeek(date);
            dateRangeQuery.setTimeLe(endOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());
            return dateRangeQuery;
        }
    },
    BN("本年"){

        public DateRangeQuery getTimeRange(String dataStr) {

            DateRangeQuery dateRangeQuery = new DateRangeQuery();
            Date date = DateUtil.date();
            Date beginOfDay = DateUtil.beginOfYear(date);

            dateRangeQuery.setTimeGe(beginOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());
            //
            Date endOfDay = DateUtil.endOfYear(date);
            dateRangeQuery.setTimeLe(endOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());
            return dateRangeQuery;
        }
    },
    BY("本月"){

        public DateRangeQuery getTimeRange(String dataStr) {

            DateRangeQuery dateRangeQuery = new DateRangeQuery();
            Date date = DateUtil.date();
            Date beginOfDay = DateUtil.beginOfMonth(date);

            dateRangeQuery.setTimeGe(beginOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());
            //
            Date endOfDay = DateUtil.endOfMonth(date);
            dateRangeQuery.setTimeLe(endOfDay.toInstant()
                    .atZone(ZoneId.systemDefault())
                    .toLocalDateTime());
            return dateRangeQuery;
        }
    };


    public  String msg;

    DateEnum(String msg){
        this.msg = msg;
    }



}

@Data
@Builder
@ToString
@NoArgsConstructor
@AllArgsConstructor
public class DateRangeQuery {



    @Schema(description = "待办生成时间-开始")
    private LocalDateTime timeGe;

    @Schema(description = "待办生成时间-结束")
    private LocalDateTime timeLe;


}

public interface DateRange {

     DateRangeQuery getTimeRange(String dataStr);
}

if(StrUtil.isNotEmpty(taskQuery.getGenTime())){

            DateRangeQuery d = DateEnum.valueOf(TaskConst.constTime.get(taskQuery.getGenTimeEq())).getTimeRange(taskQuery.getGenTimeEq());
            taskQuery.setGenTimeGe(d.getTimeGe());
            taskQuery.setGenTimeLe(d.getTimeLe());

        }

public class TaskConst {

    public static String SYSTEM_TYPE = "SYSTEM_TYPE";

    public static String JR = "今日";
    public static String BY = "本月";
    public static String BN = "本年";
    public static String BZ = "本周";

    
    public static final Map constTime = new HashMap() {
        {
            put(JR, "JR");
            put(BY , "BY ");
            put(BN , "BN ");
            put(BZ , "BZ ");
        }
    };
}