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    <h3>Editing: AbstractTransportFactory.php</h3>
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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Mailer\Transport;

use Psr\EventDispatcher\EventDispatcherInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\Mailer\Exception\IncompleteDsnException;
use Symfony\Contracts\HttpClient\HttpClientInterface;

/**
 * @author Konstantin Myakshin &lt;molodchick@gmail.com&gt;
 */
abstract class AbstractTransportFactory implements TransportFactoryInterface
{
    protected $dispatcher;
    protected $client;
    protected $logger;

    public function __construct(EventDispatcherInterface $dispatcher = null, HttpClientInterface $client = null, LoggerInterface $logger = null)
    {
        $this-&gt;dispatcher = $dispatcher;
        $this-&gt;client = $client;
        $this-&gt;logger = $logger;
    }

    public function supports(Dsn $dsn): bool
    {
        return \in_array($dsn-&gt;getScheme(), $this-&gt;getSupportedSchemes());
    }

    abstract protected function getSupportedSchemes(): array;

    protected function getUser(Dsn $dsn): string
    {
        $user = $dsn-&gt;getUser();
        if (null === $user) {
            throw new IncompleteDsnException('User is not set.');
        }

        return $user;
    }

    protected function getPassword(Dsn $dsn): string
    {
        $password = $dsn-&gt;getPassword();
        if (null === $password) {
            throw new IncompleteDsnException('Password is not set.');
        }

        return $password;
    }
}
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