Elegant use of Java enumerations

Table of contents

1. General interface (readers copy directly)

2. Interface implementation (deleted state as an example)

---

1. General interface (readers copy directly)

import cn.hutool.core.util.ObjectUtil;

import java.util.EnumSet;
import java.util.Objects;

/**
 * 枚举通用接口
 *
 * @author 
 * @date 2023/4/17
 */
public interface IBaseEnum<T> {
    /**
     * 获取值
     *
     * @return
     */
    T getValue();

    /**
     * 获取标签
     *
     * @return
     */
    String getLabel();

    /**
     * 根据值获取枚举
     *
     * @param value
     * @param clazz
     * @param <E>   枚举
     * @return
     */
    static <E extends Enum<E> & IBaseEnum> E getEnumByValue(Object value, Class<E> clazz) {
        Objects.requireNonNull(value);
        // 获取类型下的所有枚举
        EnumSet<E> allEnums = EnumSet.allOf(clazz);
        E matchEnum = allEnums.stream()
                .filter(e -> ObjectUtil.equal(e.getValue(), value))
                .findFirst()
                .orElse(null);
        return matchEnum;
    }

    /**
     * 根据文本标签获取值
     *
     * @param value
     * @param clazz
     * @param <E>
     * @return
     */
    static <E extends Enum<E> & IBaseEnum> String getLabelByValue(Object value, Class<E> clazz) {
        Objects.requireNonNull(value);
        // 获取类型下的所有枚举
        EnumSet<E> allEnums = EnumSet.allOf(clazz);
        E matchEnum = allEnums.stream()
                .filter(e -> ObjectUtil.equal(e.getValue(), value))
                .findFirst()
                .orElse(null);

        String label = null;
        if (matchEnum != null) {
            label = matchEnum.getLabel();
        }
        return label;
    }


    /**
     * 根据文本标签获取值
     *
     * @param label
     * @param clazz
     * @param <E>
     * @return
     */
    static <E extends Enum<E> & IBaseEnum> Object getValueByLabel(String label, Class<E> clazz) {
        Objects.requireNonNull(label);
        // 获取类型下的所有枚举
        EnumSet<E> allEnums = EnumSet.allOf(clazz);
        String finalLabel = label;
        E matchEnum = allEnums.stream()
                .filter(e -> ObjectUtil.equal(e.getLabel(), finalLabel))
                .findFirst()
                .orElse(null);

        Object value = null;
        if (matchEnum != null) {
            value = matchEnum.getValue();
        }
        return value;
    }


}

2. Interface implementation (deleted state as an example)

package com.ciih.iot.common.enums;

import com.ciih.iot.common.base.IBaseEnum;
import lombok.Getter;

/**
 * 状态枚举
 *
 * @author 
 * @date 2023/4/17
 */
public enum DeleteEnum implements IBaseEnum<Integer> {
    /**
     * 虚拟删除状态码
     */
    DELETE(1, "已删除"),
    UNDELETE(0, "未删除");

    @Getter
    private Integer value;

    @Getter
    private String label;

    DeleteEnum(Integer value, String label) {
        this.value = value;
        this.label = label;
    }
}