<?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\Asset;

use Assetic\Filter\FilterInterface;

/**

 * Represents an asset loaded from a file.

 *

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

 */

class FileAsset extends BaseAsset

{

    private $source;

    /**

     * Constructor.

     *

     * @param string $source     An absolute path

     * @param array  $filters    An array of filters

     * @param string $sourceRoot The source asset root directory

     * @param string $sourcePath The source asset path

     *

     * @throws InvalidArgumentException If the supplied root doesn't match the source when guessing the path

     */

    public function __construct($source, $filters = array(), $sourceRoot = null, $sourcePath = null)

    {

        if (null === $sourceRoot) {

            $sourceRoot = dirname($source);

            if (null === $sourcePath) {

                $sourcePath = basename($source);

            }

        } elseif (null === $sourcePath) {

            if (0 !== strpos($source, $sourceRoot)) {

                throw new \InvalidArgumentException(sprintf('The source "%s" is not in the root directory "%s"', $source, $sourceRoot));

            }

            $sourcePath = substr($source, strlen($sourceRoot) + 1);

        }

        $this->source = $source;

        parent::__construct($filters, $sourceRoot, $sourcePath);

    }

    public function load(FilterInterface $additionalFilter = null)

    {

        $this->doLoad(file_get_contents($this->source), $additionalFilter);

    }

    public function getLastModified()

    {

        return filemtime($this->source);

    }

}