vendor/symfony/assetic-bundle/Factory/Resource/FileResource.php

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<?php

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace Symfony\Bundle\AsseticBundle\Factory\Resource;

use Assetic\Factory\Resource\ResourceInterface;
use Symfony\Bundle\FrameworkBundle\Templating\TemplateReference;
use Symfony\Component\Templating\Loader\LoaderInterface;

/**
 * A file resource.
 *
 * @author Kris Wallsmith <kris@symfony.com>
 */
class FileResource implements ResourceInterface
{
    protected $loader;
    protected $bundle;
    protected $baseDir;
    protected $path;
    protected $template;

    /**
     * Constructor.
     *
     * @param LoaderInterface $loader  The templating loader
     * @param string          $bundle  The current bundle name
     * @param string          $baseDir The directory
     * @param string          $path    The file path
     */
    public function __construct(LoaderInterface $loader, $bundle, $baseDir, $path)
    {
        $this->loader = $loader;
        $this->bundle = $bundle;
        $this->baseDir = $baseDir;
        $this->path = $path;
    }

    public function isFresh($timestamp)
    {
        return $this->loader->isFresh($this->getTemplate(), $timestamp);
    }

    public function getContent()
    {
        $templateReference = $this->getTemplate();
        $fileResource = $this->loader->load($templateReference);

        if (!$fileResource) {
            throw new \InvalidArgumentException(sprintf('Unable to find template "%s".', $templateReference));
        }