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: namespace Jyxo\Spl;
15: 
16: /**
17:  * Iterator which uses a callback or closure for filtering data.
18:  *
19:  * @category Jyxo
20:  * @package Jyxo\Spl
21:  * @copyright Copyright (c) 2005-2011 Jyxo, s.r.o.
22:  * @license https://github.com/jyxo/php/blob/master/license.txt
23:  * @author Jakub Tománek
24:  */
25: class FilterIterator extends \FilterIterator implements \Jyxo\Spl\ArrayCopy
26: {
27:     /**
28:      * Callback which decides if an item is valid. Returns boolean, has one required parameter.
29:      *
30:      * @var \Closure|callback
31:      */
32:     private $callback;
33: 
34:     /**
35:      * Constructor.
36:      *
37:      * @param \Iterator $iterator Source data
38:      * @param \Closure|callback $callback Filter callback
39:      * @throws \InvalidArgumentException Supplied callback is not callable
40:      */
41:     public function __construct(\Iterator $iterator, $callback)
42:     {
43:         if (!is_callable($callback)) {
44:             throw new \InvalidArgumentException('Callback is not callable');
45:         }
46: 
47:         parent::__construct($iterator);
48:         $this->callback = $callback;
49:     }
50: 
51:     /**
52:      * Decides if an item is valid by calling a callback.
53:      *
54:      * @return boolean
55:      */
56:     public function accept()
57:     {
58:         $callback = $this->callback;
59:         return $callback($this->current());
60:     }
61: 
62:     /**
63:      * Returns all filtered data as an array.
64:      *
65:      * @return array
66:      */
67:     public function toArray()
68:     {
69:         return iterator_to_array($this);
70:     }
71: }
72: