ValidatorFactory.java 文件源码

private static Optional<Validator> getValidator(Annotation annotation) {
    Validator validator = null;

    if (isValidable(annotation)) {
        if (annotation instanceof Range || annotation instanceof Length) {
            validator = new RangeValidator(annotation);
        } else if (annotation instanceof Pattern) {
            validator = new PatternValidator(annotation);
        } else {
            validator = new DefaultValidator(annotation);
        }
    }
    return Optional.ofNullable(validator);
}