<?php

/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Symfony\Component\Console\CommandLoader;

use Symfony\Component\Console\Exception\CommandNotFoundException;

/**
* A simple command loader using factories to instantiate commands lazily.
*
* @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
*/
class FactoryCommandLoader implements CommandLoaderInterface
{
private $factories;

/**
* @param callable[] $factories Indexed by command names
*/
public function __construct(array $factories)
{
$this->factories = $factories;
}

/**
* {@inheritdoc}
*/
public function has($name)
{
return isset($this->factories[$name]);
}

/**
* {@inheritdoc}
*/
public function get($name)
{
if (!isset($this->factories[$name])) {
throw new CommandNotFoundException(sprintf('Command "%s" does not exist.', $name));
}

$factory = $this->factories[$name];

return $factory();
}

/**
* {@inheritdoc}
*/
public function getNames()
{
return array_keys($this->factories);
}
}