AbstractPrice.php

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<?php
namespace Magento\Framework\Pricing\Price;

use Magento\Framework\Pricing\Adjustment\CalculatorInterface;
use Magento\Framework\Pricing\Amount\AmountInterface;
use Magento\Framework\Pricing\SaleableInterface;
use Magento\Framework\Pricing\PriceInfoInterface;

abstract class AbstractPrice implements PriceInterface
{
    const PRICE_CODE = 'abstract_price';

    protected $amount;

    protected $calculator;

    protected $product;

    protected $priceType;

    protected $quantity;

    protected $priceInfo;

    protected $value;

    protected $priceCurrency;

    public function __construct(
        SaleableInterface $saleableItem,
        $quantity,
        CalculatorInterface $calculator,
        \Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency
    ) {
        $this->product = $saleableItem;
        $this->quantity = $quantity;
        $this->calculator = $calculator;
        $this->priceCurrency = $priceCurrency;
        $this->priceInfo = $saleableItem->getPriceInfo();
    }

    abstract public function getValue();

    public function getAmount()
    {
        if (!isset($this->amount[$this->getValue()])) {
            $this->amount[$this->getValue()] = $this->calculator->getAmount($this->getValue(), $this->getProduct());
        }
        return $this->amount[$this->getValue()];
    }

    public function getCustomAmount($amount = null, $exclude = null, $context = [])
    {
        if (null !== $amount) {
            $amount = $this->priceCurrency->convertAndRound($amount);
        } else {
            $amount = $this->getValue();
        }
        return $this->calculator->getAmount($amount, $this->getProduct(), $exclude, $context);
    }

    public function getPriceCode()
    {
        return static::PRICE_CODE;
    }

    public function getProduct()
    {
        return $this->product;
    }

    public function getQuantity()
    {
        return $this->quantity;
    }
}