RegisterParamConvertersPass.php

<?php

/**
 * @file
 * Contains Drupal\Core\DependencyInjection\Compiler\RegisterParamConvertersPass.
 */
namespace Drupal\Core\DependencyInjection\Compiler;

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

/**
 * Registers EntityConverter services with the ParamConverterManager.
 */
class RegisterParamConvertersPass implements CompilerPassInterface {

  /**
   * Adds services tagged with "paramconverter" to the param converter service.
   *
   * @param \Symfony\Component\DependencyInjection\ContainerBuilder $container
   *   The container to process.
   */
  public function process(ContainerBuilder $container) {
    if (!$container
      ->hasDefinition('paramconverter_manager')) {
      return;
    }
    $manager = $container
      ->getDefinition('paramconverter_manager');
    $services = array();
    foreach ($container
      ->findTaggedServiceIds('paramconverter') as $id => $attributes) {
      $priority = isset($attributes[0]['priority']) ? $attributes[0]['priority'] : 0;
      $services[$priority][] = new Reference($id);
    }
    krsort($services);
    foreach ($services as $priority) {
      foreach ($priority as $service) {
        $manager
          ->addMethodCall('addConverter', array(
          $service,
        ));
      }
    }
  }

}