vendor/symfony/monolog-bundle/DependencyInjection/Compiler/AddSwiftMailerTransportPass.php

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<?php

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

namespace Symfony\Bundle\MonologBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\Reference;

/**
 * Sets the transport for Swiftmailer handlers depending on the existing
 * container definitions.
 *
 * @author Christian Flothmann <christian.flothmann@xabbuh.de>
 */
class AddSwiftMailerTransportPass implements CompilerPassInterface
{
    /**
     * {@inheritdoc}
     */
    public function process(ContainerBuilder $container)
    {
        $handlers = $container->getParameter('monolog.swift_mailer.handlers');

        foreach ($handlers as $id) {
            $definition = $container->getDefinition($id);
            $mailerId = (string) $definition->getArgument(0);

            // Try to fetch the transport for a non-default mailer first, then go with the default swiftmailer
            $possibleServices = array(
                $mailerId.'.transport.real',
                $mailerId.'.transport',
                'swiftmailer.transport.real',
                'swiftmailer.transport',
            );

            foreach ($possibleServices as $serviceId) {
                if ($container->hasAlias($serviceId) || $container->hasDefinition($serviceId)) {
                    $definition->addMethodCall(
                        'setTransport',
                        array(new Reference($serviceId))
                    );

                    break;
                }
            }
        }
    }
}