ScopeProxy.php

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<?php
namespace Magento\CatalogSearch\Model\Indexer\Scope;

use Magento\Framework\Search\Request\Dimension;

class ScopeProxy implements \Magento\Framework\Search\Request\IndexScopeResolverInterface
{
    private $objectManager;

    private $states = [];

    private $scopeState;

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        State $scopeState,
        array $states
    ) {
        $this->objectManager = $objectManager;
        $this->scopeState = $scopeState;
        $this->states = $states;
    }

    private function create($state)
    {
        if (!array_key_exists($state, $this->states)) {
            throw new UnknownStateException(__("Requested resolver for unknown indexer state: $state"));
        }
        return $this->objectManager->create($this->states[$state]);
    }

    public function resolve($index, array $dimensions)
    {
        return $this->create($this->scopeState->getState())->resolve($index, $dimensions);
    }
}