1: <?php
 2: 
 3: /**
 4:  * Jyxo PHP Library
 5:  *
 6:  * LICENSE
 7:  *
 8:  * This source file is subject to the new BSD license that is bundled
 9:  * with this package in the file license.txt.
10:  * It is also available through the world-wide-web at this URL:
11:  * https://github.com/jyxo/php/blob/master/license.txt
12:  */
13: 
14: /**
15:  * Iterator which uses a callback or closure for filtering data.
16:  *
17:  * @category Jyxo
18:  * @package Jyxo_Spl
19:  * @copyright Copyright (c) 2005-2011 Jyxo, s.r.o.
20:  * @license https://github.com/jyxo/php/blob/master/license.txt
21:  * @author Jakub Tománek
22:  */
23: class Jyxo_Spl_FilterIterator extends FilterIterator implements Jyxo_Spl_ArrayCopy
24: {
25:     /**
26:      * Callback which decides if an item is valid. Returns boolean, has one required parameter.
27:      *
28:      * @var Closure|callback
29:      */
30:     private $callback;
31: 
32:     /**
33:      * Constructor.
34:      *
35:      * @param Iterator $iterator Source data
36:      * @param Closure|callback $callback Filter callback
37:      * @throws InvalidArgumentException Supplied callback is not callable
38:      */
39:     public function __construct(Iterator $iterator, $callback)
40:     {
41:         if (!is_callable($callback)) {
42:             throw new InvalidArgumentException('Callback is not callable');
43:         }
44: 
45:         parent::__construct($iterator);
46:         $this->callback = $callback;
47:     }
48: 
49:     /**
50:      * Decides if an item is valid by calling a callback.
51:      *
52:      * @return boolean
53:      */
54:     public function accept()
55:     {
56:         $callback = $this->callback;
57:         return $callback($this->current());
58:     }
59: 
60:     /**
61:      * Returns all filtered data as an array.
62:      *
63:      * @return array
64:      */
65:     public function toArray()
66:     {
67:         return iterator_to_array($this);
68:     }
69: }
70: