<?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;

/**
* FileResource represents a resource stored on the filesystem.
*
* The resource can be a file or a directory.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @final since Symfony 4.3
*/
class FileResource implements SelfCheckingResourceInterface
{
/**
* @var string|false
*/
private $resource;

/**
* @param string $resource The file path to the resource
*
* @throws \InvalidArgumentException
*/
public function __construct(string $resource)
{
$this->resource = realpath($resource) ?: (file_exists($resource) ? $resource : false);

if (false === $this->resource) {
throw new \InvalidArgumentException(sprintf('The file "%s" does not exist.', $resource));
}
}

public function __toString()
{
return $this->resource;
}

/**
* @return string The canonicalized, absolute path to the resource
*/
public function getResource()
{
return $this->resource;
}

/**
* {@inheritdoc}
*/
public function isFresh($timestamp)
{
return false !== ($filemtime = @filemtime($this->resource)) && $filemtime <= $timestamp;
}
}