gistfile1.php

<?php
/**
 * @file
 * Definition of Drupal\Core\Plugin\Factory\ContainerFactory.
 */

namespace Drupal\Core\Plugin\Factory;

use Drupal\Component\Plugin\Factory\ReflectionFactory;

/**
 * A plugin factory that fulfills missing dependencies from the
 * drupal_container() and maps instance configuration to constructor arguments.
 */
class ContainerFactory extends ReflectionFactory {

  /**
   * Implements Drupal\Component\Plugin\Factory\FactoryInterface::createInstance().
   */
  public function createInstance($plugin_id, array $configuration) {
    $definition = $this->discovery->getDefinition($plugin_id);
    $dependencies = !empty($definition['dependencies']) ? $definition['dependencies'] : array();
    foreach ($dependencies as $dependency => $service_id) {
      if (empty($configuration[$dependency])) {
        $configuration[$dependency] = drupal_container()->get($service_id);
      }
    }
    return parent::createInstance($plugin_id, $configuration);
  }

}