l1024-jav/src/main/java/top/lvzhiqiang/dto/R.java

package top.lvzhiqiang.dto;

import lombok.Data;
import top.lvzhiqiang.enumeration.ResultCodeEnum;

/**
 * 统一结果类
 *
 * @author lvzhiqiang
 * 2022/4/11 16:55
 */
@Data
public class R<T> {
    private Boolean success;

    private Integer code;

    private String message;

    private T data;

    // 构造器私有
    private R() {
    }

    // 通用返回成功
    public static R ok() {
        R r = new R();
        r.setSuccess(ResultCodeEnum.SUCCESS.getSuccess());
        r.setCode(ResultCodeEnum.SUCCESS.getCode());
        r.setMessage(ResultCodeEnum.SUCCESS.getMessage());
        return r;
    }

    // 通用返回失败，未知错误
    public static R error() {
        R r = new R();
        r.setSuccess(ResultCodeEnum.UNKNOWN_ERROR.getSuccess());
        r.setCode(ResultCodeEnum.UNKNOWN_ERROR.getCode());
        r.setMessage(ResultCodeEnum.UNKNOWN_ERROR.getMessage());
        return r;
    }

    // 设置结果，形参为结果枚举
    public static R setResult(ResultCodeEnum result) {
        R r = new R();
        r.setSuccess(result.getSuccess());
        r.setCode(result.getCode());
        r.setMessage(result.getMessage());
        return r;
    }

    /**
     * ------------使用链式编程，返回类本身-----------
     **/

    // 自定义返回数据
    public R data(T data) {
        this.setData(data);
        return this;
    }

    // 自定义状态信息
    public R message(String message) {
        this.setMessage(message);
        return this;
    }

    // 自定义状态码
    public R code(Integer code) {
        this.setCode(code);
        return this;
    }

    // 自定义返回结果
    public R success(Boolean success) {
        this.setSuccess(success);
        return this;
    }
}