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<?php |
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namespace danmurf\DependencyInjection; |
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use danmurf\DependencyInjection\Exception\ContainerException; |
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use danmurf\DependencyInjection\Exception\NotFoundException; |
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use Psr\Container\ContainerInterface; |
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/** |
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* Simple dependency injection container with configurable service |
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* location strategies. |
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* |
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* @author Dan Murfitt <[email protected]> |
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*/ |
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class Container implements ContainerInterface |
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{ |
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/** @var ServiceLocatorInterface */ |
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private $serviceLocator; |
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/** @var array */ |
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private $instances = []; |
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/** @var array */ |
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private $classMap = []; |
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/** |
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* @param ServiceLocatorInterface $serviceLocator |
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*/ |
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public function __construct(ServiceLocatorInterface $serviceLocator) |
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{ |
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$this->serviceLocator = $serviceLocator; |
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} |
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/** |
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* Get an instance of a service. |
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* |
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* @param string $requestedId Registered service ID or FQCN |
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* |
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* @throws NotFoundException |
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*/ |
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public function get($requestedId) |
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{ |
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if (false === $registeredId = $this->getRegisteredId($requestedId)) { |
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$this->register($this->serviceLocator->locate($requestedId, $this), $requestedId); |
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$registeredId = $requestedId; |
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} |
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return $this->instances[$registeredId]; |
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} |
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/** |
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* Determine if the container can locate an instance of the specified service ID or FQCN. |
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* |
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* @param string $id |
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* |
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* @return bool |
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*/ |
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public function has($id): bool |
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{ |
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if (false !== $this->getRegisteredId($id)) { |
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return true; |
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} |
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try { |
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$this->serviceLocator->locate($id, $this); |
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} catch (NotFoundException $exception) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Register a service with the container. |
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* |
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* @param mixed $instance An instance of a service |
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* @param string|null $id A specified service ID (FQCN will be used in the case of `null`) |
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*/ |
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public function register($instance, string $id = null) |
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{ |
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if (!is_object($instance)) { |
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throw new ContainerException('Only objects can be registered with the container.'); |
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} |
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$class = get_class($instance); |
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if (null === $id) { |
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$id = $class; |
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} |
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$this->instances[$id] = $instance; |
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$this->classMap[$class] = $id; |
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} |
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/** |
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* Get the registered ID for the requested service ID or FQCN. |
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* |
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* @param string $requestedId Service id or FQCN |
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* |
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* @return string|bool The registered ID, or false it's not found |
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*/ |
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private function getRegisteredId(string $requestedId) |
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{ |
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if (isset($this->instances[$requestedId])) { |
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return $requestedId; |
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} |
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if (isset($this->classMap[$requestedId])) { |
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return $this->classMap[$requestedId]; |
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} |
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return false; |
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} |
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} |
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danmurf /
DependencyInjection
