NovaeZSEOBundle.php

<?php
/**
 * NovaeZSEOBundle Bundle
 *
 * @package   Novactive\Bundle\eZSEOBundle
 * @author    Novactive <novaseobundle@novactive.com>
 * @copyright 2015 Novactive
 * @license   https://github.com/Novactive/NovaeZSEOBundle/blob/master/LICENSE MIT Licence
 */
namespace Novactive\Bundle\eZSEOBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;
use Novactive\Bundle\eZSEOBundle\DependencyInjection\Compiler\CustomFallbackPass;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;

/**
 * Class NovaeZSEOBundle
 */
class NovaeZSEOBundle extends Bundle
{
    /**
     * @param ContainerBuilder $container
     */
    public function build( ContainerBuilder $container )
    {
        parent::build( $container );

        $container->addCompilerPass( new CustomFallbackPass() );
    }

    /**
     * {@inheritdoc}
     */
    public function getContainerExtension()
    {
        if (null === $this->extension) {
            $extension = $this->createContainerExtension();

            if (null !== $extension) {
                if (!$extension instanceof ExtensionInterface) {
                    throw new \LogicException(sprintf('Extension %s must implement Symfony\Component\DependencyInjection\Extension\ExtensionInterface.', get_class($extension)));
                }
                $this->extension = $extension;
            } else {
                $this->extension = false;
            }
        }

        if ($this->extension) {
            return $this->extension;
        }
    }
}