Wiring up Symfony2 services in the DIC using configuration parameters

factory.xml

<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>

        <service id="vich_uploader.property_mapping_factory" class="Vich\UploaderBundle\Mapping\PropertyMappingFactory" public="false">
            <argument type="service" id="service_container" />
            <argument type="service" id="vich_uploader.annotation_driver" />
            <argument type="service" id="vich_uploader.adapter" />
            <argument>%vich_uploader.mappings%</argument>
        </service>

        <service id="vich_uploader.storage_factory" class="Vich\UploaderBundle\Storage\StorageFactory">
            <argument type="service" id="service_container" />
        </service>


    </services>

</container>

storage.xml

<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="vich_uploader.storage.adapter.rackspace_cloud_files" class="Vich\UploaderBundle\Storage\Adapter\RackspaceCloudFilesAdapter">
            <call method="setContainer">
                <argument type="service" id="service_container" />
            </call>
            <call method="setMediaContainer">
                <argument type="string">%vich_uploader.storage.adapter.rackspace.media_container%</argument>
            </call>
        </service>

        <service id="vich_uploader.storage.file_system" class="Vich\UploaderBundle\Storage\FileSystemStorage">
            <argument type="service" id="vich_uploader.property_mapping_factory" />
        </service>

        <service id="vich_uploader.storage.cdn" class="Vich\UploaderBundle\Storage\CDNStorage">
            <argument type="service" id="vich_uploader.property_mapping_factory" />
            <argument type="service" id="vich_uploader.storage.adapter.rackspace_cloud_files" />
        </service>

        <service
            id="vich_uploader.storage"
            class="Vich\UploaderBundle\Storage\StorageInterface"
            factory-service="vich_uploader.storage_factory"
            factory-method ="createStorage">

        </service>
    </services>

</container>

StorageFactory.php

<?php

namespace Vich\UploaderBundle\Storage;

use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * StorageFactory
 *
 ** @author Francesco Tassi <tassi.francesco@gmail.com>
 */
class StorageFactory
{

    /**
     *
     * @var ContainerInterface
     */
    protected $container;

    /**
     *
     * @param ContainerInterface $container
     */
    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    public function createStorage()
    {
        return $this->container->get($this->container->getParameter('vich_uploader.storage_service'));
    }

}