AutowireTrait.php

<?php

namespace Drupal\Core\DependencyInjection;

use Symfony\Component\DependencyInjection\Attribute\Autowire;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\DependencyInjection\Exception\AutowiringFailedException;

/**
 * Defines a trait for automatically wiring dependencies from the container.
 *
 * This trait uses reflection and may cause performance issues with classes
 * that will be instantiated multiple times.
 */
trait AutowireTrait {

  /**
   * Instantiates a new instance of the implementing class using autowiring.
   *
   * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
   *   The service container this instance should use.
   *
   * @return static
   */
  public static function create(ContainerInterface $container) {
    $args = [];
    if (method_exists(static::class, '__construct')) {
      $constructor = new \ReflectionMethod(static::class, '__construct');
      foreach ($constructor
        ->getParameters() as $parameter) {
        $service = ltrim((string) $parameter
          ->getType(), '?');
        foreach ($parameter
          ->getAttributes(Autowire::class) as $attribute) {
          $service = (string) $attribute
            ->newInstance()->value;
        }
        if (!$container
          ->has($service)) {
          throw new AutowiringFailedException($service, sprintf('Cannot autowire service "%s": argument "$%s" of method "%s::_construct()", you should configure its value explicitly.', $service, $parameter
            ->getName(), static::class));
        }
        $args[] = $container
          ->get($service);
      }
    }
    return new static(...$args);
  }

}