<?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\Bundle\TwigBundle\CacheWarmer;

use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;

use Symfony\Component\DependencyInjection\ContainerInterface;

use Symfony\Bundle\FrameworkBundle\CacheWarmer\TemplateFinderInterface;

/**

 * Generates the Twig cache for all templates.

 *

 * This warmer must be registered after TemplatePathsCacheWarmer,

 * as the Twig loader will need the cache generated by it.

 *

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

 */

class TemplateCacheCacheWarmer implements CacheWarmerInterface

{

    protected $container;

    protected $warmer;

    /**

     * Constructor.

     *

     * @param ContainerInterface      $container The dependency injection container

     * @param TemplateFinderInterface $finder    The template paths cache warmer

     */

    public function __construct(ContainerInterface $container, TemplateFinderInterface $finder)

    {

        // We don't inject the Twig environment directly as it depends on the

        // template locator (via the loader) which might be a cached one.

        // The cached template locator is available once the TemplatePathsCacheWarmer

        // has been warmed up

        $this->container = $container;

        $this->finder = $finder;

    }

    /**

     * Warms up the cache.

     *

     * @param string $cacheDir The cache directory

     */

    public function warmUp($cacheDir)

    {

        $twig = $this->container->get('twig');

        foreach ($this->finder->findAllTemplates() as $template) {

            if ('twig' !== $template->get('engine')) {

                continue;

            }

            try {

                $twig->loadTemplate($template);

            } catch (\Twig_Error $e) {

                // problem during compilation, give up

            }

        }

    }

    /**

     * Checks whether this warmer is optional or not.

     *

     * @return Boolean always true

     */

    public function isOptional()

    {

        return true;

    }

}