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97 lines
2.8 KiB
97 lines
2.8 KiB
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Contracts\Service;
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use Psr\Container\ContainerExceptionInterface;
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use Psr\Container\NotFoundExceptionInterface;
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/**
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* A trait to help implement PSR-11 service locators.
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*
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* @author Robin Chalas <robin.chalas@gmail.com>
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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trait ServiceLocatorTrait
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{
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private $factories;
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private $loading = array();
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/**
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* @param callable[] $factories
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*/
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public function __construct(array $factories)
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{
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$this->factories = $factories;
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}
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/**
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* {@inheritdoc}
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*/
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public function has($id)
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{
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return isset($this->factories[$id]);
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}
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/**
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* {@inheritdoc}
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*/
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public function get($id)
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{
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if (!isset($this->factories[$id])) {
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throw $this->createNotFoundException($id);
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}
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if (isset($this->loading[$id])) {
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$ids = array_values($this->loading);
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$ids = \array_slice($this->loading, array_search($id, $ids));
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$ids[] = $id;
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throw $this->createCircularReferenceException($id, $ids);
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}
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$this->loading[$id] = $id;
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try {
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return $this->factories[$id]($this);
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} finally {
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unset($this->loading[$id]);
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}
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}
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private function createNotFoundException(string $id): NotFoundExceptionInterface
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{
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if (!$alternatives = array_keys($this->factories)) {
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$message = 'is empty...';
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} else {
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$last = array_pop($alternatives);
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if ($alternatives) {
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$message = sprintf('only knows about the "%s" and "%s" services.', implode('", "', $alternatives), $last);
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} else {
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$message = sprintf('only knows about the "%s" service.', $last);
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}
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}
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if ($this->loading) {
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$message = sprintf('The service "%s" has a dependency on a non-existent service "%s". This locator %s', end($this->loading), $id, $message);
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} else {
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$message = sprintf('Service "%s" not found: the current service locator %s', $id, $message);
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}
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return new class($message) extends \InvalidArgumentException implements NotFoundExceptionInterface {
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};
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}
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private function createCircularReferenceException(string $id, array $path): ContainerExceptionInterface
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{
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return new class(sprintf('Circular reference detected for service "%s", path: "%s".', $id, implode(' -> ', $path))) extends \RuntimeException implements ContainerExceptionInterface {
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};
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}
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}
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