Java设计模式中的建造者(Builder)模式解读

public class LogEntity {
    @Getter
    private Long id;
    /**
     * 操作时间
     */
    @Getter
    private String eventDate;
    /**
     * 操作日志模块: default other
     */
    @Getter
    private String module;
    /**
     * 操作内容
     */
    @Getter
    private String message;
    /**
     * IP
     */
    @Getter
    private String ipAddress;
    /**
     * 操作用户
     */
    @Getter
    private String username;
    /**
     * 日志所属组织
     */
    @Getter
    private Long organizationId;
    /**
     * 日志来源('日志来源：1：终端上报，2：平台下发，3：平台操作，4：APP操作')
     */
    @Getter
    private Integer logSource;
    public PlatformLoggerEntity(Long id, String module, String message, Long organizationId, Integer logSource) {
        this.id = id;
        this.module = module;
        this.message = message;
        this.organizationId = organizationId;
        this.logSource = logSource;
    }
}

public class PlatformLoggerEntity {
    /**
     * 使用雪花算法生成ID
     */
    @Getter
    private Long id;
    /**
     * 操作时间
     */
    @Getter
    private String eventDate;
    /**
     * 操作日志模块: default other
     */
    @Getter
    private String module;
    /**
     * 操作内容
     */
    @Getter
    private String message;
    /**
     * IP
     */
    @Getter
    private String ipAddress;
    /**
     * 操作用户
     */
    @Getter
    private String username;
    /**
     * 日志所属组织
     */
    @Getter
    private Long organizationId;
    /**
     * 日志来源('日志来源：1：终端上报，2：平台下发，3：平台操作，4：APP操作')
     */
    @Getter
    private Integer logSource;
    /**
     * 显示类型 0：正常显示  1：超链显示
     */
    @Getter
    private Integer showType;
    private PlatformLoggerEntity(Builder builder) {
        this.id = IdUtil.next();
        this.username = SystemHelper.getCurrentUserName();
        this.ipAddress = SystemHelper.getIpAddress();
        this.organizationId = builder.organizationId;
        this.module = builder.module.getModule();
        this.message = builder.message;
        this.monitoringOperation = builder.monitoringOperation;
        this.monitorName = builder.monitorName;
        this.plateColor = builder.plateColor;
        this.showType = builder.showType;
        this.eventDate = LocalDateUtils.dateTimeFormat(new Date());
        this.logSource = builder.logSource.getLoggerSource();
    }
    /**
     * @return 创建builder类的实例对象
     */
    public static Builder newBuilder() {
        return new Builder();
    }
    /**
     * 日誌Builder类
     */
    public static class Builder {
        /**
         * 操作日志模块: default other
         */
        private LoggerModule module;
        /**
         * 操作内容
         */
        private String message;
        /**
         * 日志所属组织
         */
        private Long organizationId;
        /**
         * 日志来源('日志来源：1：终端上报，2：平台下发，3：平台操作，4：APP操作')
         */
        private LoggerSource logSource;
        /**
         * 显示类型 0：正常显示  1：超链显示
         */
        private Integer showType;
        publick LogEntity build() {
            // 默认为平台操作
            if (Objects.isNull(logSource)) {
                this.logSource = LoggerSource.PLATFORM_OPERATION;
            }
            if (Objects.isNull(organizationId)) {
                this.organizationId = SystemHelper.getCurrentUserOrgId();
            }
            // 用于前端展示
            if (Objects.isNull(module)) {
                this.module = LoggerModule.DEFAULT;
                this.showType = LoggerConstant.SHOW_TYPE_NORMAL;
            } else if (module.equals(LoggerModule.DEFAULT)) {
                this.showType = LoggerConstant.SHOW_TYPE_NORMAL;
            } else {
                this.showType = LoggerConstant.SHOW_TYPE_HYPERLINK;
            }
            return new PlatformLoggerEntity(this);
        }
        public Builder module(LoggerModule module) {
            this.module = module;
            return this;
        }
        public Builder message(String message) {
            this.message = message;
            return this;
        }
        public Builder organizationId(Long organizationId) {
            this.organizationId = organizationId;
            return this;
        }
        public Builder logSource(LoggerSource logSource) {
            this.logSource = logSource;
            return this;
        }
    }
}