<?php
/*
 * This file is part of the YepSua package.
 * (c) 2009-2011 Omar Yepez <hide@address.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * YsUtilAutoloader based on Symfony AutoLoaders.
 *
 * @package    YepSua
 * @subpackage jQuery4PHP
 * @author     Fabien Potencier <hide@address.com>
 * @version    SVN: $Id$
 */
class YsUtilAutoloader
{

  static protected $registered = false, $instance   = null;

  /**
   * Registers YsJQueryAutoLoader as an SPL autoloader.
   */
  static public function register()
  {
    ini_set('unserialize_callback_func', 'spl_autoload_call');
    spl_autoload_register(array(self::getInstance(), 'autoload'));
    self::$registered = true;
  }

  static function unregister(){
    spl_autoload_unregister(array(self::getInstance(), 'autoload'));
    self::$registered = false;
  }

  static function isRegistered(){
    return self::$registered;
  }

  /**
   * Retrieves the singleton instance of this class.
   *
   * @return sfCoreAutoload A sfCoreAutoload implementation instance.
   */
  static public function getInstance()
  {
    if (!isset(self::$instance))
    {
      self::$instance = new self();
    }

    return self::$instance;
  }

  /**
   * Handles autoloading of classes.
   *
   * @param  string  $class  A class name.
   *
   * @return boolean Returns true if the class has been loaded
   */
  public function autoload($class)
  {
    if (0 !== strpos($class, 'Ys'))
    {
      return false;
    }
    if (file_exists(dirname(__FILE__).'/'.$class.'.php')){
      require dirname(__FILE__).'/'.$class.'.php';
    }
    return true;
  }
}