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<?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\ClassLoader;

/**
* ApcUniversalClassLoader implements a "universal" autoloader cached in APC for PHP 5.3.
*
* It is able to load classes that use either:
*
* * The technical interoperability standards for PHP 5.3 namespaces and
* class names (https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md);
*
* * The PEAR naming convention for classes (http://pear.php.net/).
*
* Classes from a sub-namespace or a sub-hierarchy of PEAR classes can be
* looked for in a list of locations to ease the vendoring of a sub-set of
* classes for large projects.
*
* Example usage:
*
* require 'vendor/symfony/src/Symfony/Component/ClassLoader/UniversalClassLoader.php';
* require 'vendor/symfony/src/Symfony/Component/ClassLoader/ApcUniversalClassLoader.php';
*
* use Symfony\Component\ClassLoader\ApcUniversalClassLoader;
*
* $loader = new ApcUniversalClassLoader('apc.prefix.');
*
* // register classes with namespaces
* $loader->registerNamespaces(array(
* 'Symfony\Component' => __DIR__.'/component',
* 'Symfony' => __DIR__.'/framework',
* 'Sensio' => array(__DIR__.'/src', __DIR__.'/vendor'),
* ));
*
* // register a library using the PEAR naming convention
* $loader->registerPrefixes(array(
* 'Swift_' => __DIR__.'/Swift',
* ));
*
* // activate the autoloader
* $loader->register();
*
* In this example, if you try to use a class in the Symfony\Component
* namespace or one of its children (Symfony\Component\Console for instance),
* the autoloader will first look for the class under the component/
* directory, and it will then fallback to the framework/ directory if not
* found before giving up.
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Kris Wallsmith <kris@symfony.com>
*
* @api
*/
class ApcUniversalClassLoader extends UniversalClassLoader
{
    private $prefix;

    /**
* Constructor.
*
* @param string $prefix A prefix to create a namespace in APC
*
* @api
*/
    public function __construct($prefix)
    {
        if (!extension_loaded('apc')) {
            throw new \RuntimeException('Unable to use ApcUniversalClassLoader as APC is not enabled.');
        }

        $this->prefix = $prefix;
    }

    /**
* Finds a file by class name while caching lookups to APC.
*
* @param string $class A class name to resolve to file
*
* @return string|null The path, if found
*/
    public function findFile($class)
    {
        if (false === $file = apc_fetch($this->prefix.$class)) {
            apc_store($this->prefix.$class, $file = parent::findFile($class));
        }

        return $file;
    }
}
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