DeferredShippingMethodChooserPool.php

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<?php
namespace Magento\InstantPurchase\Model\ShippingMethodChoose;

class DeferredShippingMethodChooserPool
{
    private $choosers;

    public function __construct(array $choosers)
    {
        foreach ($choosers as $chooser) {
            if (!$chooser instanceof DeferredShippingMethodChooserInterface) {
                throw new \InvalidArgumentException(sprintf(
                    'Invalid configuration. Chooser should be instance of %s.',
                    DeferredShippingMethodChooserInterface::class
                ));
            }
        }
        $this->choosers = $choosers;
    }

    public function get($type) : DeferredShippingMethodChooserInterface
    {
        if (!isset($this->choosers[$type])) {
            throw new \InvalidArgumentException(sprintf(
                'Deferred shipping method %s is not registered.',
                $type
            ));
        }

        return $this->choosers[$type];
    }
}