ValueHandlerPool.php

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

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

class ValueHandlerPool implements \Magento\Payment\Gateway\Config\ValueHandlerPoolInterface
{
    const DEFAULT_HANDLER = 'default';

    private $handlers;

    public function __construct(
        TMapFactory $tmapFactory,
        array $handlers
    ) {
        if (!isset($handlers[self::DEFAULT_HANDLER])) {
            throw new \LogicException('Default handler should be provided.');
        }

        $this->handlers = $tmapFactory->create(
            [
                'array' => $handlers,
                'type' => ValueHandlerInterface::class
            ]
        );
    }

    public function get($field)
    {
        return isset($this->handlers[$field])
            ? $this->handlers[$field]
            : $this->handlers[self::DEFAULT_HANDLER];
    }
}