<?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\Templating\Loader;

use Symfony\Component\Templating\Storage;

use Symfony\Component\Templating\TemplateReferenceInterface;

/**

 * ChainLoader is a loader that calls other loaders to load templates.

 *

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

 */

class ChainLoader extends Loader

{

    protected $loaders;

    /**

     * Constructor.

     *

     * @param Loader[] $loaders An array of loader instances

     */

    public function __construct(array $loaders = array())

    {

        $this->loaders = array();

        foreach ($loaders as $loader) {

            $this->addLoader($loader);

        }

    }

    /**

     * Adds a loader instance.

     *

     * @param Loader $loader A Loader instance

     */

    public function addLoader(Loader $loader)

    {

        $this->loaders[] = $loader;

    }

    /**

     * Loads a template.

     *

     * @param TemplateReferenceInterface $template A template

     *

     * @return Storage|Boolean false if the template cannot be loaded, a Storage instance otherwise

     */

    public function load(TemplateReferenceInterface $template)

    {

        foreach ($this->loaders as $loader) {

            if (false !== $storage = $loader->load($template)) {

                return $storage;

            }

        }

        return false;

    }

    /**

     * Returns true if the template is still fresh.

     *

     * @param TemplateReferenceInterface $template A template

     * @param integer                    $time     The last modification time of the cached template (timestamp)

     *

     * @return Boolean

     */

    public function isFresh(TemplateReferenceInterface $template, $time)

    {

        foreach ($this->loaders as $loader) {

            return $loader->isFresh($template);

        }

        return false;

    }

}