pdo-document/src/Mapper/ExistsMapper.php

<?php
/**
 * @author Daniel J. Summers <daniel@bitbadger.solutions>
 * @license MIT
 */

declare(strict_types=1);

namespace BitBadger\PDODocument\Mapper;

use BitBadger\PDODocument\{Configuration, Mode};
use Exception;

/**
 * Map an EXISTS result to a boolean value
 *
 * @implements Mapper<bool>
 */
class ExistsMapper implements Mapper
{
    /**
     * @inheritDoc
     * @throws Exception If the database mode has not been set
     */
    public function map(array $result): bool
    {
        return match (Configuration::mode('map existence result')) {
            Mode::PgSQL  => (bool)$result[0],
            Mode::SQLite => (int)$result[0] > 0,
        };
    }
}