AbstractDiscount.php

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<?php
namespace Magento\SalesRule\Model\Rule\Action\Discount;

abstract class AbstractDiscount implements DiscountInterface
{
    protected $discountFactory;

    protected $validator;

    protected $priceCurrency;

    public function __construct(
        \Magento\SalesRule\Model\Validator $validator,
        \Magento\SalesRule\Model\Rule\Action\Discount\DataFactory $discountDataFactory,
        \Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency
    ) {
        $this->validator = $validator;
        $this->discountFactory = $discountDataFactory;
        $this->priceCurrency = $priceCurrency;
    }

    abstract public function calculate($rule, $item, $qty);

    public function fixQuantity($qty, $rule)
    {
        return $qty;
    }
}