<?php

/*

 * This file is part of SwiftMailer.

 * (c) 2004-2009 Chris Corbyn

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

/**

 * General utility class in Swift Mailer, not to be instantiated.

 * 

 * @package Swift

 * 

 * @author Chris Corbyn

 */

abstract class Swift

{

  static $initialized = false;

  static $initPath;

  /** Swift Mailer Version number generated during dist release process */

  const VERSION = '@SWIFT_VERSION_NUMBER@';

  /**

   * Internal autoloader for spl_autoload_register().

   * 

   * @param string $class

   */

  public static function autoload($class)

  {

    //Don't interfere with other autoloaders

    if (0 !== strpos($class, 'Swift_'))

    {

      return;

    }

    $path = dirname(__FILE__).'/'.str_replace('_', '/', $class).'.php';

    if (!file_exists($path))

    {

      return;

    }

    if (self::$initPath && !self::$initialized)

    {

      self::$initialized = true;

      require self::$initPath;

    }

    require_once $path;

  }

  /**

   * Configure autoloading using Swift Mailer.

   * 

   * This is designed to play nicely with other autoloaders.

   *

   * @param string $initPath The init script to load when autoloading the first Swift class

   */

  public static function registerAutoload($initPath = null)

  {

    self::$initPath = $initPath;

    spl_autoload_register(array('Swift', 'autoload'));

  }

}