BuilderFactory.php

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<?php
namespace Magento\Framework\View\Layout;

use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\View;

class BuilderFactory
{
    const TYPE_LAYOUT = 'layout';
    const TYPE_PAGE   = 'page';
    protected $typeMap = [
        self::TYPE_LAYOUT => \Magento\Framework\View\Layout\Builder::class,
        self::TYPE_PAGE   => \Magento\Framework\View\Page\Builder::class,
    ];

    protected $objectManager;

    public function __construct(
        ObjectManagerInterface $objectManager,
        array $typeMap = []
    ) {
        $this->objectManager = $objectManager;
        $this->mergeTypes($typeMap);
    }

    protected function mergeTypes(array $typeMap)
    {
        foreach ($typeMap as $typeInfo) {
            if (isset($typeInfo['type']) && isset($typeInfo['class'])) {
                $this->typeMap[$typeInfo['type']] = $typeInfo['class'];
            }
        }
    }

    public function create($type, array $arguments)
    {
        if (empty($this->typeMap[$type])) {
            throw new \InvalidArgumentException('"' . $type . ': isn\'t allowed');
        }

        $builderInstance = $this->objectManager->create($this->typeMap[$type], $arguments);
        if (!$builderInstance instanceof BuilderInterface) {
            throw new \InvalidArgumentException(get_class($builderInstance) . ' isn\'t instance of BuilderInterface');
        }
        return $builderInstance;
    }
}