Adjustment.php

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<?php
namespace Magento\Weee\Pricing;

use Magento\Catalog\Pricing\Price\CustomOptionPriceInterface;
use Magento\Framework\Pricing\Adjustment\AdjustmentInterface;
use Magento\Framework\Pricing\PriceCurrencyInterface;
use Magento\Framework\Pricing\SaleableInterface;
use Magento\Weee\Helper\Data as WeeeHelper;

class Adjustment implements AdjustmentInterface
{
    const ADJUSTMENT_CODE = 'weee';

    protected $weeeHelper;

    protected $sortOrder;

    protected $priceCurrency;

    public function __construct(WeeeHelper $weeeHelper, PriceCurrencyInterface $priceCurrency, $sortOrder = null)
    {
        $this->weeeHelper = $weeeHelper;
        $this->priceCurrency = $priceCurrency;
        $this->sortOrder = $sortOrder;
    }

    public function getAdjustmentCode()
    {
        return self::ADJUSTMENT_CODE;
    }

    public function isIncludedInBasePrice()
    {
        return false;
    }

    public function isIncludedInDisplayPrice()
    {
        return $this->weeeHelper->typeOfDisplay(
            [
                \Magento\Weee\Model\Tax::DISPLAY_INCL,
                \Magento\Weee\Model\Tax::DISPLAY_INCL_DESCR,
                \Magento\Weee\Model\Tax::DISPLAY_EXCL_DESCR_INCL,
            ]
        );
    }

    public function extractAdjustment($amount, SaleableInterface $saleableItem, $context = [])
    {
        return 0;
    }

    public function applyAdjustment($amount, SaleableInterface $saleableItem, $context = [])
    {
        if (isset($context[CustomOptionPriceInterface::CONFIGURATION_OPTION_FLAG])) {
            return $amount;
        }
        return $amount + $this->getAmount($saleableItem);
    }

    public function isExcludedWith($adjustmentCode)
    {
        return (($adjustmentCode == self::ADJUSTMENT_CODE) ||
            ($adjustmentCode == \Magento\Tax\Pricing\Adjustment::ADJUSTMENT_CODE));
    }

    protected function getAmount(SaleableInterface $saleableItem)
    {
        $weeeAmount = $this->weeeHelper->getAmountExclTax($saleableItem);
        $weeeAmount = $this->priceCurrency->convert($weeeAmount);
        return $weeeAmount;
    }

    public function getSortOrder()
    {
        return $this->sortOrder;
    }
}