ArrayPool.php

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<?php
namespace Magento\Framework\Option;

class ArrayPool
{
    protected $_objectManager;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        $this->_objectManager = $objectManager;
    }

    public function get($model)
    {
        $modelInstance = $this->_objectManager->get($model);
        if (false == $modelInstance instanceof \Magento\Framework\Option\ArrayInterface) {
            throw new \InvalidArgumentException($model . 'doesn\'t implement \Magento\Framework\Option\ArrayInterface');
        }
        return $modelInstance;
    }
}