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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Contracts\Service;
use Psr\Container\ContainerInterface;
use Symfony\Contracts\Service\Attribute\SubscribedService;
/**
* Implementation of ServiceSubscriberInterface that determines subscribed services from
* method return types. Service ids are available as "ClassName::methodName".
*
* @author Kevin Bond <kevinbond@gmail.com>
*/
trait ServiceSubscriberTrait
{
/** @var ContainerInterface */
protected $container;
/**
* {@inheritdoc}
*/
public static function getSubscribedServices(): array
{
$services = method_exists(get_parent_class(self::class) ?: '', __FUNCTION__) ? parent::getSubscribedServices() : [];
foreach ((new \ReflectionClass(self::class))->getMethods() as $method) {
if (self::class !== $method->getDeclaringClass()->name) {
continue;
}
if (!$attribute = $method->getAttributes(SubscribedService::class)[0] ?? null) {
continue;
}
if ($method->isStatic() || $method->isAbstract() || $method->isGenerator() || $method->isInternal() || $method->getNumberOfRequiredParameters()) {
throw new \LogicException(sprintf('Cannot use "%s" on method "%s::%s()" (can only be used on non-static, non-abstract methods with no parameters).', SubscribedService::class, self::class, $method->name));
}
if (!$returnType = $method->getReturnType()) {
throw new \LogicException(sprintf('Cannot use "%s" on methods without a return type in "%s::%s()".', SubscribedService::class, $method->name, self::class));
}
$serviceId = $returnType instanceof \ReflectionNamedType ? $returnType->getName() : (string) $returnType;
if ($returnType->allowsNull()) {
$serviceId = '?'.$serviceId;
}
$services[$attribute->newInstance()->key ?? self::class.'::'.$method->name] = $serviceId;
}
return $services;
}
/**
* @required
*/
public function setContainer(ContainerInterface $container): ?ContainerInterface
{
$this->container = $container;
if (method_exists(get_parent_class(self::class) ?: '', __FUNCTION__)) {
return parent::setContainer($container);
}
return null;
}
}