GeneratorResolver.php

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<?php
namespace Magento\CatalogSearch\Model\Search\RequestGenerator;

class GeneratorResolver
{
    private $generators;

    private $defaultGenerator;

    public function __construct(GeneratorInterface $defaultGenerator, array $generators)
    {
        $this->defaultGenerator = $defaultGenerator;
        $this->generators = $generators;
    }

    public function getGeneratorForType($type)
    {
        $generator = isset($this->generators[$type]) ? $this->generators[$type] : $this->defaultGenerator;
        if (!($generator instanceof GeneratorInterface)) {
            throw new \InvalidArgumentException(
                'Generator must implement ' . GeneratorInterface::class
            );
        }
        return $generator;
    }
}