ValidatorPool.php

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<?php
namespace Magento\Payment\Gateway\Validator;

use Magento\Framework\Exception\NotFoundException;
use Magento\Framework\ObjectManager\TMap;
use Magento\Framework\ObjectManager\TMapFactory;

class ValidatorPool implements \Magento\Payment\Gateway\Validator\ValidatorPoolInterface
{
    private $validators;

    public function __construct(
        TMapFactory $tmapFactory,
        array $validators = []
    ) {
        $this->validators = $tmapFactory->create(
            [
                'array' => $validators,
                'type' => ValidatorInterface::class
            ]
        );
    }

    public function get($code)
    {
        if (!isset($this->validators[$code])) {
            throw new NotFoundException(__('The validator for the "%1" field doesn\'t exist.', $code));
        }

        return $this->validators[$code];
    }
}