IsStockItemSalableConditionChain.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySales\Model\ResourceModel\IsStockItemSalableCondition;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\DB\Select;
use Magento\Framework\Exception\LocalizedException;

class IsStockItemSalableConditionChain implements GetIsStockItemSalableConditionInterface
{
    private $conditions = [];

    private $resourceConnection;

    public function __construct(
        ResourceConnection $resourceConnection,
        array $conditions = []
    ) {
        foreach ($conditions as $getIsSalableCondition) {
            if (!$getIsSalableCondition instanceof GetIsStockItemSalableConditionInterface) {
                throw new LocalizedException(
                    __('Condition must implement %1', GetIsStockItemSalableConditionInterface::class)
                );
            }
        }
        $this->resourceConnection = $resourceConnection;
        $this->conditions = $conditions;
    }

    public function execute(Select $select): string
    {
        if (empty($this->conditions)) {
            return '1';
        }

        $conditionStrings = [];
        foreach ($this->conditions as $condition) {
            $conditionString = $condition->execute($select);
            if ('' !== trim($conditionString)) {
                $conditionStrings[] = $conditionString;
            }
        }

        $isSalableString = '(' . implode($conditionStrings, ') OR (') . ')';
        return (string)$this->resourceConnection->getConnection()->getCheckSql($isSalableString, 1, 0);
    }
}