adapter.php
103 lines
| 1 | <?php |
| 2 | /** |
| 3 | * @package VikAppointments |
| 4 | * @subpackage core |
| 5 | * @author E4J s.r.l. |
| 6 | * @copyright Copyright (C) 2021 E4J s.r.l. All Rights Reserved. |
| 7 | * @license http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL |
| 8 | * @link https://vikwp.com |
| 9 | */ |
| 10 | |
| 11 | // No direct access |
| 12 | defined('ABSPATH') or die('No script kiddies please!'); |
| 13 | |
| 14 | /** |
| 15 | * Observable action adapter. |
| 16 | * |
| 17 | * @since 1.7.3 |
| 18 | */ |
| 19 | class VAPActionObservableAdapter implements VAPActionObservable |
| 20 | { |
| 21 | /** |
| 22 | * An array of subscribers. |
| 23 | * |
| 24 | * @var VAPActionObserver[] |
| 25 | */ |
| 26 | private $listeners = []; |
| 27 | |
| 28 | /** |
| 29 | * Class constructor. |
| 30 | * |
| 31 | * @param array $listeners |
| 32 | */ |
| 33 | public function __construct(array $listeners = []) |
| 34 | { |
| 35 | foreach ($listeners as $l) |
| 36 | { |
| 37 | $this->attach($l); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Attaches the specified observer to this entity. |
| 43 | * |
| 44 | * @param VAPActionObserver $observer |
| 45 | * |
| 46 | * @return void |
| 47 | */ |
| 48 | public function attach(VAPActionObserver $observer) |
| 49 | { |
| 50 | $this->listeners[] = $observer; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Detaches the specified observer from this entity. |
| 55 | * |
| 56 | * @param VAPActionObserver $observer |
| 57 | * |
| 58 | * @return boolean True in case of success. |
| 59 | */ |
| 60 | public function detach(VAPActionObserver $observer) |
| 61 | { |
| 62 | // search the specified observer |
| 63 | $index = array_search($observer, $this->listeners); |
| 64 | |
| 65 | if ($index !== false) |
| 66 | { |
| 67 | // remove the observer from the array |
| 68 | array_splice($this->listeners, $index, 1); |
| 69 | return true; |
| 70 | } |
| 71 | |
| 72 | return false; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Notifies the subscribers every time the internal state changes. |
| 77 | * |
| 78 | * @param VAPActionState $state |
| 79 | * |
| 80 | * @return VAPActionResult A list of results returned by the observers. |
| 81 | */ |
| 82 | public function notify(VAPActionState $state) |
| 83 | { |
| 84 | $results = []; |
| 85 | |
| 86 | // iterate subscribers |
| 87 | foreach ($this->listeners as $l) |
| 88 | { |
| 89 | // trigger state change |
| 90 | $results[] = $l->trigger($state); |
| 91 | |
| 92 | if ($state->isPropagationStopped()) |
| 93 | { |
| 94 | // break the cycle in case the last subscriber |
| 95 | // stopped the action propagation |
| 96 | break; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | return new VAPActionResult($results); |
| 101 | } |
| 102 | } |
| 103 |