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An enhanced toolkit of Mybatis to simplify development.

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/*
 * Copyright (c) 2011-2020, hubin ([email protected]).
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 

 * http://www.apache.org/licenses/LICENSE-2.0
 * 

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.baomidou.mybatisplus.extension.api;

import java.io.Serializable;
import java.util.Optional;

import com.baomidou.mybatisplus.extension.enums.ApiErrorCode;
import com.baomidou.mybatisplus.extension.exceptions.ApiException;

import lombok.Data;
import lombok.experimental.Accessors;

/**
 * 

 * REST API 返回结果
 * 
 *
 * @author hubin
 * @since 2018-06-05
 */
@Data
@Accessors(chain = true)
public class R implements Serializable {

    /**
     * 业务错误码
     */
    private long code;
    /**
     * 结果集
     */
    private T data;
    /**
     * 描述
     */
    private String msg;

    public R() {
        // to do nothing
    }

    public R(IErrorCode errorCode) {
        errorCode = Optional.ofNullable(errorCode).orElse(ApiErrorCode.FAILED);
        this.code = errorCode.getCode();
        this.msg = errorCode.getMsg();
    }

    public static  R ok(T data) {
        return restResult(data, ApiErrorCode.SUCCESS);
    }

    public static  R failed(String msg) {
        return restResult(null, ApiErrorCode.FAILED.getCode(), msg);
    }

    public static  R failed(IErrorCode errorCode) {
        return restResult(null, errorCode);
    }

    public static  R restResult(T data, IErrorCode errorCode) {
        return restResult(data, errorCode.getCode(), errorCode.getMsg());
    }

    private static  R restResult(T data, long code, String msg) {
        R apiResult = new R<>();
        apiResult.setCode(code);
        apiResult.setData(data);
        apiResult.setMsg(msg);
        return apiResult;
    }

    public boolean ok() {
        return ApiErrorCode.SUCCESS.getCode() == code;
    }

    /**
     * 服务间调用非业务正常，异常直接释放
     */
    public T serviceData() {
        if (!ok()) {
            throw new ApiException(this.msg);
        }
        return data;
    }
}