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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace Wikimedia\Leximorph\Traits; |
| 8 | |
| 9 | use Psr\Log\LoggerInterface; |
| 10 | use Psr\Log\NullLogger; |
| 11 | use UnexpectedValueException; |
| 12 | use Wikimedia\ObjectFactory\ObjectFactory; |
| 13 | |
| 14 | /** |
| 15 | * SpecBasedFactoryTrait |
| 16 | * |
| 17 | * Trait for instantiating Leximorph objects from a spec map. |
| 18 | * |
| 19 | * @since 1.45 |
| 20 | * @author Doğu Abaris (abaris@null.net) |
| 21 | * @license https://www.gnu.org/copyleft/gpl.html GPL-2.0-or-later |
| 22 | */ |
| 23 | trait SpecBasedFactoryTrait { |
| 24 | |
| 25 | /** |
| 26 | * The default language code. |
| 27 | */ |
| 28 | protected string $langCode; |
| 29 | |
| 30 | /** |
| 31 | * The logger instance. |
| 32 | */ |
| 33 | protected ?LoggerInterface $logger = null; |
| 34 | |
| 35 | /** |
| 36 | * Cache of created singleton objects. |
| 37 | * |
| 38 | * @var array<string, object> |
| 39 | */ |
| 40 | protected array $singletons = []; |
| 41 | |
| 42 | /** |
| 43 | * Return the spec map (keyed by class name). |
| 44 | * |
| 45 | * @return array<class-string, array<string, mixed>> |
| 46 | */ |
| 47 | abstract protected function getSpecMap(): array; |
| 48 | |
| 49 | /** |
| 50 | * Return the constructor arguments for the given spec. |
| 51 | * |
| 52 | * Each subclass can decide how to build arguments based on flags like "langDependent", "needsLogger", etc. |
| 53 | * |
| 54 | * @param array<string,mixed> $spec |
| 55 | * @param LoggerInterface $logger |
| 56 | * |
| 57 | * @return array<int,mixed> |
| 58 | */ |
| 59 | abstract protected function getSpecArgs( array $spec, LoggerInterface $logger ): array; |
| 60 | |
| 61 | /** |
| 62 | * Create and cache an object instance. |
| 63 | * |
| 64 | * @template T of object |
| 65 | * |
| 66 | * @param class-string<T> $class The class name. |
| 67 | * |
| 68 | * @return T An instance of the specified class. |
| 69 | * |
| 70 | * @since 1.45 |
| 71 | */ |
| 72 | protected function createFromSpec( string $class ) { |
| 73 | if ( isset( $this->singletons[$class] ) ) { |
| 74 | /** @var T $cached */ |
| 75 | $cached = $this->singletons[$class]; |
| 76 | |
| 77 | return $cached; |
| 78 | } |
| 79 | |
| 80 | $specs = $this->getSpecMap(); |
| 81 | if ( !isset( $specs[$class] ) ) { |
| 82 | throw new UnexpectedValueException( "Class not registered: $class" ); |
| 83 | } |
| 84 | |
| 85 | $spec = $specs[$class]; |
| 86 | $logger = $this->logger ?? new NullLogger(); |
| 87 | |
| 88 | $args = $this->getSpecArgs( $spec, $logger ); |
| 89 | if ( !empty( $spec['args'] ) && is_array( $spec['args'] ) ) { |
| 90 | $args = array_merge( $args, $spec['args'] ); |
| 91 | } |
| 92 | |
| 93 | $objectSpec = [ |
| 94 | 'class' => $class, |
| 95 | 'args' => $args, |
| 96 | ]; |
| 97 | |
| 98 | /** @phan-suppress-next-line PhanTypeInvalidCallableArrayKey */ |
| 99 | $instance = ObjectFactory::getObjectFromSpec( $objectSpec ); |
| 100 | |
| 101 | if ( !$instance instanceof $class ) { |
| 102 | throw new UnexpectedValueException( |
| 103 | "Expected instance of $class, got " . get_class( $instance ) |
| 104 | ); |
| 105 | } |
| 106 | |
| 107 | $this->singletons[$class] = $instance; |
| 108 | |
| 109 | return $instance; |
| 110 | } |
| 111 | } |