PriceComposite.php

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<?php
namespace Magento\Framework\Pricing;

use Magento\Framework\Pricing\Price\Factory as PriceFactory;
use Magento\Framework\Pricing\Price\PriceInterface;

class PriceComposite
{
    protected $priceFactory;

    protected $metadata;

    public function __construct(PriceFactory $priceFactory, array $metadata = [])
    {
        $this->priceFactory = $priceFactory;
        $this->metadata = $metadata;
    }

    public function getPriceCodes()
    {
        return array_keys($this->metadata);
    }

    public function getMetadata()
    {
        return $this->metadata;
    }

    public function createPriceObject(SaleableInterface $salableItem, $priceCode, $quantity)
    {
        if (!isset($this->metadata[$priceCode])) {
            throw new \InvalidArgumentException($priceCode . ' is not registered in prices list');
        }
        $className = $this->metadata[$priceCode]['class'];
        return $this->priceFactory->create($salableItem, $className, $quantity);
    }
}