<?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\Resource;

/**

 * DirectoryResource represents a resources stored in a subdirectory tree.

 *

 * @author Fabien Potencier <fabien@symfony.com>

 */

class DirectoryResource implements ResourceInterface

{

    private $resource;

    private $pattern;

    /**

     * Constructor.

     *

     * @param string $resource The file path to the resource

     * @param string $pattern  A pattern to restrict monitored files

     */

    public function __construct($resource, $pattern = null)

    {

        $this->resource = $resource;

        $this->pattern = $pattern;

    }

    /**

     * Returns a string representation of the Resource.

     *

     * @return string A string representation of the Resource

     */

    public function __toString()

    {

        return (string) $this->resource;

    }

    /**

     * Returns the resource tied to this Resource.

     *

     * @return mixed The resource

     */

    public function getResource()

    {

        return $this->resource;

    }

    /**

     * Returns true if the resource has not been updated since the given timestamp.

     *

     * @param integer $timestamp The last time the resource was loaded

     *

     * @return Boolean true if the resource has not been updated, false otherwise

     */

    public function isFresh($timestamp)

    {

        if (!file_exists($this->resource)) {

            return false;

        }

        $newestMTime = filemtime($this->resource);

        foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($this->resource), \RecursiveIteratorIterator::SELF_FIRST) as $file) {

            // if regex filtering is enabled only check matching files

            if ($this->pattern && $file->isFile() && !preg_match($this->pattern, $file->getBasename())) {

                continue;

            }

            // always monitor directories for changes, except the .. entries

            // (otherwise deleted files wouldn't get detected)

            if ($file->isDir() && '/..' === substr($file, -3)) {

                continue;

            }

            $newestMTime = max($file->getMTime(), $newestMTime);

        }

        return $newestMTime < $timestamp;

    }

}