Using DefinitionDecorator to extend abstract service definition in a CompilerPass.

ShopCompilerPass.php

<?php
/**
 * ShopCompilerPass.php
 *
 * @author Thomas Ploch <t.ploch@reizwerk.com>
 * @since  17.01.13 14:26
 * @filesource
 */
namespace Einblick\CoreShopBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\DefinitionDecorator;
use Symfony\Component\DependencyInjection\Exception\RuntimeException;

/**
 * ShopCompilerPass class
 */
class ShopCompilerPass implements CompilerPassInterface
{
    /**
     * You can modify the container here before it is dumped to PHP code.
     *
     * @param ContainerBuilder $container
     *
     * @api
     */
    public function process(ContainerBuilder $container)
    {
        $config             = $container->getExtensionConfig('core_shop');
        $productTypeKey     = $config[0]['product_type_key'];
        $productTypeFactory = $config[0]['product_type_factory_service'];

        if (!$container->hasDefinition($productTypeFactory)) {
            throw new RuntimeException("ProductType factory service '$productTypeFactory' does not exist.");
        }
        
        $factoryDefinition = new DefinitionDecorator($productTypeFactory);
        $factoryDefinition->addArgument($productTypeKey);

        $container->setDefinition($productTypeKey, $factoryDefinition);
    }
}