<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\twig;

/**
 * Twig view file loader class.
 *
 * @author dev-mraj <dev.meghraj@gmail.com>
 */
class FileLoader implements \Twig_LoaderInterface
{
    /**
     * @var string Path to directory
     */
    private $_dir;

    /**
     * @param string $dir path to directory
     */
    public function __construct($dir)
    {
        $this->_dir = $dir;
    }

    /**
     * Compare a file's freshness with previously stored timestamp
     *
     * @param string $name file name to check
     * @param integer $time timestamp to compare with
     * @return boolean true if file is still fresh and not changes, false otherwise
     */
    public function isFresh($name, $time)
    {
        return filemtime($this->getFilePath($name)) <= $time;
    }

    /**
     * Get the source of given file name
     *
     * @param string $name file name
     * @return string contents of given file name
     */
    public function getSource($name)
    {
        return file_get_contents($this->getFilePath($name));
    }

    /**
     * Get unique key that can represent this file uniquely among other files.
     * @param string $name
     * @return string
     */
    public function getCacheKey($name)
    {
        return $this->getFilePath($name);
    }

    /**
     * internally used to get absolute path of given file name
     * @param string $name file name
     * @return string absolute path of file
     */
    protected function getFilePath($name)
    {
        return $this->_dir . '/' . $name;
    }
}
