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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;
}
}