ProductSalableResult.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySales\Model\IsProductSalableForRequestedQtyCondition;

use Magento\InventorySalesApi\Api\Data\ProductSalableResultInterface;
use Magento\InventorySalesApi\Api\Data\ProductSalabilityErrorInterface;
use Magento\Framework\Model\AbstractExtensibleModel;
use Magento\InventorySalesApi\Api\Data\ProductSalableResultExtensionInterface;

class ProductSalableResult extends AbstractExtensibleModel implements ProductSalableResultInterface
{
    private $errors = [];

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Api\ExtensionAttributesFactory $extensionFactory,
        \Magento\Framework\Api\AttributeValueFactory $customAttributeFactory,
        array $errors,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        parent::__construct(
            $context,
            $registry,
            $extensionFactory,
            $customAttributeFactory,
            $resource,
            $resourceCollection,
            $data
        );
        $this->errors = $errors;
    }

    public function isSalable(): bool
    {
        return empty($this->errors);
    }

    public function getErrors(): array
    {
        return $this->errors;
    }

    public function getExtensionAttributes(): ?ProductSalableResultExtensionInterface
    {
        $extensionAttributes = $this->_getExtensionAttributes();
        if (null === $extensionAttributes) {
            $extensionAttributes = $this->extensionAttributesFactory->create(ProductSalableResultInterface::class);
            $this->setExtensionAttributes($extensionAttributes);
        }
        return $extensionAttributes;
    }

    public function setExtensionAttributes(ProductSalableResultExtensionInterface $extensionAttributes): void
    {
        $this->_setExtensionAttributes($extensionAttributes);
    }
}