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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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use ReflectionClass; |
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use ReflectionException; |
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use ReflectionParameter; |
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class AutoWireServiceLocator extends ConfigurableServiceLocator |
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{ |
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/** |
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* Load services by infering their dependencies if they aren't specified in config. |
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* |
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* @param string $id The service ID or FQCN |
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* @param ContainerInterface $container The container to get service dependencies from |
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* |
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* @throws NotFoundException |
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* @throws ContainerException |
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*/ |
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public function locate($id, ContainerInterface $container) |
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{ |
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try { |
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return parent::locate($id, $container); |
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} catch (NotFoundException $exception) { |
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// Service isn't in config, so attempt to autowire... |
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} |
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try { |
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$class = new ReflectionClass($id); |
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} catch (ReflectionException $exception) { |
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throw new NotFoundException(sprintf('Unable to autowire class `%s`.', $id)); |
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} |
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if (null !== $class->getConstructor()) { |
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return $this->instantiateClassWithConstructor($class, $container, $id); |
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} |
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return $class->newInstance(); |
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} |
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/** |
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* Get a dependency from a method parameter. |
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* |
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* @param ReflectionParameter $parameter |
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* @param ContainerInterface $container |
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* @param string $id |
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* |
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* @return mixed |
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* |
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* @throws ContainerException |
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*/ |
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private function getParameterInstance( |
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ReflectionParameter $parameter, |
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ContainerInterface $container, |
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string $id |
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) { |
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if (null === $dependencyClass = $parameter->getClass()) { |
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throw new ContainerException(sprintf( |
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'Unable to autowire service `%s` as it has scalar arguments.', |
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$id |
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)); |
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} |
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return $container->get($dependencyClass->getName()); |
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} |
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/** |
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* Get a new instance of a class with constructor arguments. |
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* |
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* @param ReflectionClass $class |
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* @param ContainerInterface $container |
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* @param string $id |
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* |
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* @return mixed |
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* |
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* @throws ContainerException |
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*/ |
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private function instantiateClassWithConstructor( |
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ReflectionClass $class, |
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ContainerInterface $container, |
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string $id |
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) { |
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$args = []; |
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foreach ($class->getConstructor()->getParameters() as $parameter) { |
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$args[] = $this->getParameterInstance($parameter, $container, $id); |
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} |
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return $class->newInstanceArgs($args); |
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} |
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} |
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danmurf /
DependencyInjection
