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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * This file is part of php-fast-forward/container. |
| 7 | * |
| 8 | * This source file is subject to the license bundled |
| 9 | * with this source code in the file LICENSE. |
| 10 | * |
| 11 | * @copyright Copyright (c) 2025-2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com> |
| 12 | * @license https://opensource.org/licenses/MIT MIT License |
| 13 | * |
| 14 | * @see https://github.com/php-fast-forward/container |
| 15 | * @see https://github.com/php-fast-forward |
| 16 | * @see https://datatracker.ietf.org/doc/html/rfc2119 |
| 17 | */ |
| 18 | |
| 19 | namespace FastForward\Container\Factory; |
| 20 | |
| 21 | use Psr\Container\ContainerInterface; |
| 22 | |
| 23 | /** |
| 24 | * A factory that resolves an alias to another service within a PSR-11 container. |
| 25 | * |
| 26 | * This factory MUST be used when a service should act as an alias for another |
| 27 | * service already registered in the container. |
| 28 | * |
| 29 | * When invoked, it SHALL delegate resolution to the aliased service identifier. |
| 30 | */ |
| 31 | class AliasFactory implements FactoryInterface |
| 32 | { |
| 33 | /** |
| 34 | * @var array<string, self> Registry of AliasFactory instances indexed by alias name. |
| 35 | * This MAY be used to cache and reuse factory instances. |
| 36 | */ |
| 37 | private static array $aliases = []; |
| 38 | |
| 39 | /** |
| 40 | * Constructs the AliasFactory with the target service identifier. |
| 41 | * |
| 42 | * @param string $alias the identifier of the service to which this factory points |
| 43 | */ |
| 44 | public function __construct( |
| 45 | private string $alias |
| 46 | ) {} |
| 47 | |
| 48 | /** |
| 49 | * Resolves the aliased service from the container. |
| 50 | * |
| 51 | * This method MUST return the same instance as if the original alias identifier |
| 52 | * were used directly with the container. |
| 53 | * |
| 54 | * @param ContainerInterface $container the container instance to resolve the alias from |
| 55 | * |
| 56 | * @return mixed the resolved service instance |
| 57 | */ |
| 58 | public function __invoke(ContainerInterface $container): mixed |
| 59 | { |
| 60 | return $container->get($this->alias); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Retrieves or creates a cached AliasFactory for a given alias. |
| 65 | * |
| 66 | * This static method SHOULD be used to avoid instantiating multiple factories |
| 67 | * for the same alias unnecessarily. The same instance will be reused for each alias. |
| 68 | * |
| 69 | * @param string $alias the identifier to create or retrieve the factory for |
| 70 | * |
| 71 | * @return self an AliasFactory instance associated with the provided alias |
| 72 | */ |
| 73 | public static function get(string $alias): self |
| 74 | { |
| 75 | return self::$aliases[$alias] ??= new self($alias); |
| 76 | } |
| 77 | } |