<?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\Config\Loader;

use Symfony\Component\Config\Exception\LoaderLoadException;

/**
* Loader is the abstract class used by all built-in loaders.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
abstract class Loader implements LoaderInterface
{
protected $resolver;

/**
* {@inheritdoc}
*/
public function getResolver()
{
return $this->resolver;
}

/**
* {@inheritdoc}
*/
public function setResolver(LoaderResolverInterface $resolver)
{
$this->resolver = $resolver;
}

/**
* Imports a resource.
*
* @param mixed $resource A resource
* @param string|null $type The resource type or null if unknown
*
* @return mixed
*/
public function import($resource, $type = null)
{
return $this->resolve($resource, $type)->load($resource, $type);
}

/**
* Finds a loader able to load an imported resource.
*
* @param mixed $resource A resource
* @param string|null $type The resource type or null if unknown
*
* @return $this|LoaderInterface
*
* @throws LoaderLoadException If no loader is found
*/
public function resolve($resource, $type = null)
{
if ($this->supports($resource, $type)) {
return $this;
}

$loader = null === $this->resolver ? false : $this->resolver->resolve($resource, $type);

if (false === $loader) {
throw new LoaderLoadException($resource, null, 0, null, $type);
}

return $loader;
}
}