<?php

/*

 * This file is part of the Assetic package, an OpenSky project.

 *

 * (c) 2010-2011 OpenSky Project Inc

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Assetic\Cache;

/**

 * A simple filesystem cache.

 *

 * @author Kris Wallsmith <kris.wallsmith@gmail.com>

 */

class FilesystemCache implements CacheInterface

{

    private $dir;

    public function __construct($dir)

    {

        $this->dir = $dir;

    }

    public function has($key)

    {

        return file_exists($this->dir.'/'.$key);

    }

    public function get($key)

    {

        $path = $this->dir.'/'.$key;

        if (!file_exists($path)) {

            throw new \RuntimeException('There is no cached value for '.$key);

        }

        return file_get_contents($path);

    }

    public function set($key, $value)

    {

        if (!is_dir($this->dir) && false === @mkdir($this->dir, 0777, true)) {

            throw new \RuntimeException('Unable to create directory '.$this->dir);

        }

        $path = $this->dir.'/'.$key;

        if (false === @file_put_contents($path, $value)) {

            throw new \RuntimeException('Unable to write file '.$path);

        }

    }

    public function remove($key)

    {

        $path = $this->dir.'/'.$key;

        if (file_exists($path) && false === @unlink($path)) {

            throw new \RuntimeException('Unable to remove file '.$path);

        }

    }

}