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<?php |
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namespace King23\DI; |
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use King23\DI\Exception\AlreadyRegisteredException; |
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use King23\DI\Exception\NotFoundException; |
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/** |
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* Class DependencyContainer |
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* @package King23\DI |
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*/ |
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class DependencyContainer implements ContainerInterface |
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{ |
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protected $injectors = []; |
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/** |
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* Constructor |
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*/ |
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public function __construct() |
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{ |
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$that = $this; |
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// we register ourselves, so this container can be injected too |
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/** @noinspection PhpUnhandledExceptionInspection */ |
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$this->register( |
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ContainerInterface::class, |
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function () use ($that) { |
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return $that; |
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} |
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); |
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} |
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/** |
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* check if for $interface there is an existing service to inject |
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* |
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* @param $interface |
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* @return bool |
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*/ |
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protected function hasServiceFor($interface) |
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{ |
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return isset($this->injectors[$interface]); |
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} |
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/** |
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* gets a service instance for $interface - singletoned! |
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* |
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* @param string $interface |
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* @return mixed |
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*/ |
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protected function getServiceInstanceFor($interface) |
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{ |
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return $this->injectors[$interface](); |
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} |
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/** |
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* register an service implementation as a singleton (shared instance) |
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* |
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* @param $interface |
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* @param callable $implementation |
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* @throws AlreadyRegisteredException |
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*/ |
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public function register($interface, callable $implementation) |
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{ |
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if (isset($this->injectors[$interface])) { |
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throw new AlreadyRegisteredException("Error: for $interface there is already an implementation registered"); |
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} |
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// wraps the implementation in a singleton |
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$this->injectors[$interface] = function () use ($implementation) { |
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static $instance; |
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if (is_null($instance)) { |
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$instance = $implementation(); |
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} |
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return $instance; |
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}; |
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} |
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/** |
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* register a service implementation as a factory |
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* |
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* @param $interface |
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* @param callable $implementation |
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* @throws AlreadyRegisteredException |
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*/ |
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public function registerFactory($interface, callable $implementation) |
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{ |
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if (isset($this->injectors[$interface])) { |
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throw new AlreadyRegisteredException("Error: for $interface there is already an implementation registered"); |
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} |
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$this->injectors[$interface] = $implementation; |
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} |
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/** |
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* @param string $classname fully qualified classname |
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* @return object |
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* @throws NotFoundException |
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* @throws \ReflectionException |
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*/ |
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public function get($classname) |
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{ |
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// first we check if this is maybe a known service |
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if ($this->hasServiceFor($classname)) { |
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return $this->getServiceInstanceFor($classname); |
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} |
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// alright, this was not one of our known services, so we assume |
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// we are supposed to play factory for $classname |
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// lets see if the class actually exists first |
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if (!class_exists($classname, true) && !interface_exists($classname, true)) { |
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throw new NotFoundException("Class/Interface not found: '$classname'"); |
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} |
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$reflector = new \ReflectionClass($classname); |
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$args = []; |
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$constructor = $reflector->getConstructor(); |
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// if there is no constructor, we don't need to inject anything |
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if (!is_null($constructor)) { |
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/** @var \ReflectionParameter $parameter */ |
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foreach ($constructor->getParameters() as $parameter) { |
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try { |
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if (is_null($parameter->getClass())) { |
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throw new NotFoundException("parameters for constructor contains field without typehint"); |
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} |
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} catch (\ReflectionException $reflectionException) { |
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throw new NotFoundException("can't reflect parameter '{$parameter->name}' of '$classname'", 0, $reflectionException); |
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} |
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$paramClass = $parameter->getClass()->getName(); |
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if ($this->hasServiceFor($paramClass)) { |
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$args[] = $this->getServiceInstanceFor($paramClass); |
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} else { |
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$args[] = $this->get($paramClass); |
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} |
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} |
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} |
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if ($reflector->isInterface()) { |
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throw new NotFoundException("no Injector registered for interface: '$classname'"); |
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} |
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return $reflector->newInstanceArgs($args); |
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} |
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/** |
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* Returns true if the container can return an entry for the given identifier. |
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* Returns false otherwise. |
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* |
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* `has($id)` returning true does not mean that `get($id)` will not throw an exception. |
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* It does however mean that `get($id)` will not throw a `NotFoundExceptionInterface`. |
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* |
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* @param string $id Identifier of the entry to look for. |
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* |
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* @return bool |
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*/ |
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public function has($id) |
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{ |
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// if we have a service registered, we can assume true |
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if($this->hasServiceFor($id)) { |
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return true; |
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} |
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// if we don't have as service registered, we might still pull one from the hat |
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// so lets at least check if the class would be available |
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return class_exists($id, true); |
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} |
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} |
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ppetermann /
king23-di
