AbstractAdjustment.php

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

use Magento\Framework\Pricing\SaleableInterface;
use Magento\Framework\Pricing\Price\PriceInterface;
use Magento\Framework\Pricing\PriceCurrencyInterface;
use Magento\Framework\View\Element\Template;

abstract class AbstractAdjustment extends Template implements AdjustmentRenderInterface
{
    protected $priceCurrency;

    protected $amountRender;

    public function __construct(
        Template\Context $context,
        PriceCurrencyInterface $priceCurrency,
        array $data = []
    ) {
        $this->priceCurrency = $priceCurrency;
        parent::__construct($context, $data);
    }

    public function render(AmountRenderInterface $amountRender, array $arguments = [])
    {
        $this->amountRender = $amountRender;

        $origArguments = $this->getData();
        $this->setData(array_replace($origArguments, $arguments));

        $html = $this->apply();

        // restore original block arguments
        $this->setData($origArguments);
        return $html;
    }

    public function getAmountRender()
    {
        return $this->amountRender;
    }

    public function getPriceType($priceCode)
    {
        return $this->getSaleableItem()->getPriceInfo()->getPrice($priceCode);
    }

    public function getPrice()
    {
        return $this->amountRender->getPrice();
    }

    public function getSaleableItem()
    {
        return $this->amountRender->getSaleableItem();
    }

    public function formatCurrency(
        $amount,
        $includeContainer = true,
        $precision = PriceCurrencyInterface::DEFAULT_PRECISION
    ) {
        return $this->priceCurrency->format($amount, $includeContainer, $precision);
    }

    public function convertAndFormatCurrency(
        $amount,
        $includeContainer = true,
        $precision = PriceCurrencyInterface::DEFAULT_PRECISION
    ) {
        return $this->priceCurrency->convertAndFormat($amount, $includeContainer, $precision);
    }

    public function getAdjustment()
    {
        return $this->getSaleableItem()->getPriceInfo()->getAdjustment($this->getAdjustmentCode());
    }

    abstract protected function apply();
}