1: <?php
 2: 
 3: /*
 4:  * This file is part of SwiftMailer.
 5:  * (c) 2004-2009 Chris Corbyn
 6:  *
 7:  * For the full copyright and license information, please view the LICENSE
 8:  * file that was distributed with this source code.
 9:  */
10: 
11: /**
12:  * General utility class in Swift Mailer, not to be instantiated.
13:  *
14:  * @package Swift
15:  *
16:  * @author Chris Corbyn
17:  */
18: abstract class Swift
19: {
20:     public static $initialized = false;
21:     public static $inits = array();
22: 
23:     /** Swift Mailer Version number generated during dist release process */
24:     const VERSION = '4.2.1';
25: 
26:     /**
27:      * Registers an initializer callable that will be called the first time
28:      * a SwiftMailer class is autoloaded.
29:      *
30:      * This enables you to tweak the default configuration in a lazy way.
31:      *
32:      * @param mixed $callable A valid PHP callable that will be called when autoloading the first Swift class
33:      */
34:     public static function init($callable)
35:     {
36:         self::$inits[] = $callable;
37:     }
38: 
39:     /**
40:      * Internal autoloader for spl_autoload_register().
41:      *
42:      * @param string $class
43:      */
44:     public static function autoload($class)
45:     {
46:         //Don't interfere with other autoloaders
47:         if (0 !== strpos($class, 'Swift_')) {
48:             return;
49:         }
50: 
51:         $path = dirname(__FILE__).'/'.str_replace('_', '/', $class).'.php';
52: 
53:         if (!file_exists($path)) {
54:             return;
55:         }
56: 
57:         require $path;
58: 
59:         if (self::$inits && !self::$initialized) {
60:             self::$initialized = true;
61:             foreach (self::$inits as $init) {
62:                 call_user_func($init);
63:             }
64:         }
65:     }
66: 
67:     /**
68:      * Configure autoloading using Swift Mailer.
69:      *
70:      * This is designed to play nicely with other autoloaders.
71:      *
72:      * @param mixed $callable A valid PHP callable that will be called when autoloading the first Swift class
73:      */
74:     public static function registerAutoload($callable = null)
75:     {
76:         if (null !== $callable) {
77:             self::$inits[] = $callable;
78:         }
79:         spl_autoload_register(array('Swift', 'autoload'));
80:     }
81: }
82: