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<?php namespace League\Tactician\Handler\Locator; use League\Tactician\Exception\MissingHandlerException; /** * This locator loads Handlers from a provided callable. * * At first glance, this might seem fairly useless but it's actually very * useful to encapsulate DI containers without having to write a custom adapter * for each one. * * Let's say you have a Symfony container or similar that works via a 'get' * method. You can pass in an array style callable such as: * * $locator = new CallableLocator([$container, 'get']) * * This is easy to set up and will now automatically pipe the command name * straight through to the $container->get() method without having to write * the custom locator. * * Naturally, you can also pass in closures for further behavior tweaks. */ class CallableLocator implements HandlerLocator { /** * @var callable */ private $callable; /** * @param callable $callable */ public function __construct(callable $callable) { $this->callable = $callable; } /** * {@inheritdoc} */ public function getHandlerForCommand($commandName) { $callable = $this->callable; $handler = $callable($commandName); // Odds are the callable threw an exception but it always pays to check if ($handler === null) { throw MissingHandlerException::forCommand($commandName); } return $handler; } }
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