ValidationErrorInfo (@Nullable LogEventRecordRequest request, @NotNull File file) { if (request == null) { return new ValidationErrorInfo("File is empty or has invalid format: " + file.getName(), 1); } if (isEmpty(request.getDevice())) { return new ValidationErrorInfo("Cannot upload event log, device ID is empty", 2); } else if (isEmpty(request.getProduct())) { return new ValidationErrorInfo("Cannot upload event log, product code is empty", 3); } else if (isEmpty(request.getRecorder())) { return new ValidationErrorInfo("Cannot upload event log, recorder code is empty", 4); } else if (request.getRecords().isEmpty()) { return new ValidationErrorInfo("Cannot upload event log, record list is empty", 5); } for (LogEventRecord content : request.getRecords()) { if (content.getEvents().isEmpty()) { return new ValidationErrorInfo("Cannot upload event log, event list is empty", 6); } } return null; }