ScopeResolverPool.php

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<?php
namespace Magento\Framework\App;

class ScopeResolverPool
{
    protected $_scopeResolvers = [];

    public function __construct(
        array $scopeResolvers = []
    ) {
        $this->_scopeResolvers = $scopeResolvers;
    }

    public function get($scopeType)
    {
        if (!isset($this->_scopeResolvers[$scopeType]) ||
            !($this->_scopeResolvers[$scopeType] instanceof \Magento\Framework\App\ScopeResolverInterface)
        ) {
            throw new \InvalidArgumentException("Invalid scope type '{$scopeType}'");
        }
        return $this->_scopeResolvers[$scopeType];
    }
}