DefaultValidator.php

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<?php
namespace Magento\Catalog\Model\Product\Option\Validator;

use Magento\Catalog\Model\Product\Option;
use Zend_Validate_Exception;

class DefaultValidator extends \Magento\Framework\Validator\AbstractValidator
{
    protected $productOptionTypes;

    protected $priceTypes;

    public function __construct(
        \Magento\Catalog\Model\ProductOptions\ConfigInterface $productOptionConfig,
        \Magento\Catalog\Model\Config\Source\Product\Options\Price $priceConfig
    ) {
        foreach ($productOptionConfig->getAll() as $option) {
            foreach ($option['types'] as $type) {
                $this->productOptionTypes[] = $type['name'];
            }
        }

        foreach ($priceConfig->toOptionArray() as $item) {
            $this->priceTypes[] = $item['value'];
        }
    }

    public function isValid($value)
    {
        $messages = [];

        if (!$this->validateOptionRequiredFields($value)) {
            $messages['option required fields'] = 'Missed values for option required fields';
        }

        if (!$this->validateOptionType($value)) {
            $messages['option type'] = 'Invalid option type';
        }

        if (!$this->validateOptionValue($value)) {
            $messages['option values'] = 'Invalid option value';
        }

        $this->_addMessages($messages);

        return empty($messages);
    }

    protected function validateOptionRequiredFields(Option $option)
    {
        $storeId = \Magento\Store\Model\Store::DEFAULT_STORE_ID;
        $product = $option->getProduct();
        if ($product) {
            $storeId = $product->getStoreId();
        }
        $title = $option->getTitle();
        return $this->isValidOptionTitle($title, $storeId) && !$this->isEmpty($option->getType());
    }

    protected function isValidOptionTitle($title, $storeId)
    {
        // we should be able to set null title for not default store (used for deletion from store view)
        if ($storeId > \Magento\Store\Model\Store::DEFAULT_STORE_ID && $title === null) {
            return true;
        }

        // checking whether title is null and is empty string
        if ($title === null || $title === '') {
            return false;
        }

        return true;
    }

    protected function validateOptionType(Option $option)
    {
        return $this->isInRange($option->getType(), $this->productOptionTypes);
    }

    protected function validateOptionValue(Option $option)
    {
        return $this->isInRange($option->getPriceType(), $this->priceTypes);
    }

    protected function isEmpty($value)
    {
        return empty($value);
    }

    protected function isInRange($value, array $range)
    {
        return in_array($value, $range);
    }

    protected function isNegative($value)
    {
        return intval($value) < 0;
    }
}