SizeValidator.java 文件源码

@Override
public Optional<String> getErrorMessage(Object objectValue, Annotation annotation) {
    if (isCorrect(objectValue, annotation))
        return Optional.absent();

    Size sizeAnnotation = (Size) annotation;

    if (objectValue instanceof String) {
        return Optional.of(createErrorMessageForString(sizeAnnotation));
    } else {
        return Optional.of(createErrorMessageForCollection(sizeAnnotation));
    }
}