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<?php |
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namespace Kambo\Deinj; |
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use Psr\Container\ContainerInterface; |
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use Kambo\Deinj\Exception\NotFoundException; |
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/** |
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* Simple dependency injection container. |
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* |
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* @author Bohuslav Simek <[email protected]> |
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* @license MIT |
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*/ |
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final class Container implements ContainerInterface |
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{ |
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private $instances = []; |
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private $items = []; |
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/** |
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* Finds an entry of the container by its identifier and returns it. |
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* |
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* @param string $id Identifier of the entry to look for. |
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* |
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* @throws NotFoundException No entry was found for **this** identifier. |
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* |
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* @return mixed Entry. |
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*/ |
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public function get($id) |
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{ |
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if (!$this->hasEntry($id)) { |
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throw new NotFoundException('Entry '.$id.' does not exists.'); |
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} |
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if (!isset($this->instances[$id])) { |
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$this->instances[$id] = $this->createInstance($id); |
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} |
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return $this->instances[$id]; |
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} |
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/** |
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* Check if the container can return an entry for the given identifier. |
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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 $id Identifier of the entry to look for. |
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* |
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* @return bool Returns true if the container can return an entry for the given identifier. |
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* Returns false otherwise. |
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*/ |
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public function has($id) |
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{ |
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return $this->hasEntry($id); |
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} |
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/** |
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* Set entry into the container. |
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* |
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* @param string $id Identifier of the entry to look for. |
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* @param mixed $entry Entry which should be returned |
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* |
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* @return self Instance of the self for the fluent interface. |
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*/ |
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public function set($id, $entry) : Container |
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{ |
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unset($this->instances[$id]); |
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$this->items[$id] = $entry; |
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return $this; |
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} |
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// ------------ PRIVATE METHODS |
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/** |
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* Create instance of the class |
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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 mixed Instance of the entry |
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*/ |
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private function createInstance(string $id) |
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{ |
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$factory = $this->items[$id]; |
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return $factory($this); |
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} |
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/** |
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* Check if the container can return an entry for the given identifier. |
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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 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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private function hasEntry(string $id) : bool |
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{ |
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return isset($this->items[$id]) ? true : false; |
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} |
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} |
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kambo-1st /
Deinj
