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<?php |
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declare(strict_types = 1); |
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namespace Bnf\Di; |
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use Psr\Container\ContainerInterface; |
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class Container implements ContainerInterface |
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{ |
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/** @var array */ |
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private $entries = []; |
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/** @var array */ |
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private $factories = []; |
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/** @var ContainerInterface */ |
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private $container; |
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/** |
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* Instantiate the container. |
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* |
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* Objects and parameters can be passed as argument to the constructor. |
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* |
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* @param iterable $providers The service providers to register. |
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* @param array $entries The default parameters or objects. |
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*/ |
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public function __construct(iterable $providers = [], array $entries = [], ContainerInterface $delegate = null) |
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{ |
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$this->entries = $entries; |
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$this->container = $delegate ?? $this; |
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$factories = []; |
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foreach ($providers as $provider) { |
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$factories = (array) $provider->getFactories() + $factories; |
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foreach ($provider->getExtensions() as $id => $extension) { |
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// Decorate a previously defined extension or if that is not available, |
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// create a lazy lookup to a factory from the list of vanilla factories. |
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// Lazy because we currently can not know whether a factory will only |
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// become available due to a subsequent provider. |
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$innerFactory = $this->factories[$id] ?? function (ContainerInterface $c) use (&$factories, $id) { |
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return isset($factories[$id]) ? $factories[$id]($c) : null; |
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}; |
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$this->factories[$id] = function (ContainerInterface $container) use ($extension, $innerFactory) { |
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$previous = $innerFactory($container); |
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return $extension($container, $previous); |
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}; |
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} |
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} |
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// Add factories to the list of factories for services that were not extended. |
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// (i.e those that have not been specified in getExtensions) |
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$this->factories += $factories; |
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} |
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/** |
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* @param string $id |
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* @return bool |
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*/ |
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public function has($id) |
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{ |
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return array_key_exists($id, $this->entries) || array_key_exists($id, $this->factories); |
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} |
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/** |
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* @param string $id |
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* @return mixed |
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*/ |
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private function create(string $id) |
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{ |
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$factory = $this->factories[$id] ?? null; |
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if ((bool) $factory) { |
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// Remove factory as it is no longer required. |
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// Set factory to false to be able to detect |
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// cyclic dependency loops. |
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$this->factories[$id] = false; |
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return $this->entries[$id] = $factory($this->container); |
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} |
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if (array_key_exists($id, $this->entries)) { |
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// This condition is triggered in the unlikely case that the entry is null |
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// Note: That is because the coalesce operator used in get() can not handle that |
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return $this->entries[$id]; |
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} |
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if ($factory === null) { |
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throw new NotFoundException('Container entry "' . $id . '" is not available.', 1519978105); |
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} |
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// if ($factory === false) |
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throw new ContainerException('Container entry "' . $id . '" is part of a cyclic dependency chain.', 1520175002); |
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} |
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/** |
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* @param string $id |
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* @return mixed |
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*/ |
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public function get($id) |
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{ |
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return $this->entries[$id] ?? $this->create($id); |
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} |
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} |
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bnf /
di
