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name : ServiceSubscriberTrait.php
 <?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\Required;
use Symfony\Contracts\Service\Attribute\SubscribedService;

trigger_deprecation('symfony/contracts', 'v3.5', '"%s" is deprecated, use "ServiceMethodsSubscriberTrait" instead.', ServiceSubscriberTrait::class);

/**
 * Implementation of ServiceSubscriberInterface that determines subscribed services
 * from methods that have the #[SubscribedService] attribute.
 *
 * Service ids are available as "ClassName::methodName" so that the implementation
 * of subscriber methods can be just `return $this->container->get(__METHOD__);`.
 *
 * @property ContainerInterface $container
 *
 * @author Kevin Bond <kevinbond@gmail.com>
 *
 * @deprecated since symfony/contracts v3.5, use ServiceMethodsSubscriberTrait instead
 */
trait ServiceSubscriberTrait
{
    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));
            }

            /* @var SubscribedService $attribute */
            $attribute = $attribute->newInstance();
            $attribute->key ??= self::class.'::'.$method->name;
            $attribute->type ??= $returnType instanceof \ReflectionNamedType ? $returnType->getName() : (string) $returnType;
            $attribute->nullable = $returnType->allowsNull();

            if ($attribute->attributes) {
                $services[] = $attribute;
            } else {
                $services[$attribute->key] = ($attribute->nullable ? '?' : '').$attribute->type;
            }
        }

        return $services;
    }

    #[Required]
    public function setContainer(ContainerInterface $container): ?ContainerInterface
    {
        $ret = null;
        if (method_exists(get_parent_class(self::class) ?: '', __FUNCTION__)) {
            $ret = parent::setContainer($container);
        }

        $this->container = $container;

        return $ret;
    }
}
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