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<?php
/**
* @version $Id: Dispatcher.php 10831 2013-05-29 19:32:17Z btowles $
* @author RocketTheme http://www.rockettheme.com
* @copyright Copyright (C) 2007 - 2020 RocketTheme, LLC
* @license http://www.gnu.org/licenses/gpl-2.0.html GNU/GPLv2 only
*
* Derived from:
*
* This file is part of the symfony package.
* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* RokCommon_Dispatcher implements a dispatcher object.
*
* @see http://developer.apple.com/documentation/Cocoa/Conceptual/Notifications/index.html Apple's Cocoa framework
*
* @package symfony
* @subpackage event_dispatcher
* @author Fabien Potencier <fabien.potencier@symfony-project.com>
* @version SVN: $Id: Dispatcher.php 10831 2013-05-29 19:32:17Z btowles $
*/
class RokCommon_Dispatcher
{
/**
* @var array
*/
protected $listeners = array();
/**
* Connects a listener to a given event name.
*
* @param string $name An event name
* @param mixed $listener A PHP callable
* @param int $priority
*/
public function connect($name, $listener, $priority = 10)
{
if (!isset($this->listeners[$name][$priority])) {
$this->listeners[$name][$priority] = array();
}
$this->listeners[$name][$priority][] = $listener;
ksort($this->listeners[$name]);
}
/**
* Disconnects a listener for a given event name.
*
* @param string $name An event name
* @param mixed $listener A PHP callable
*
* @param int $priority
*
* @return mixed false if listener does not exist, null otherwise
*/
public function disconnect($name, $listener, $priority = 10)
{
if (!isset($this->listeners[$name][$priority])) {
return false;
}
foreach ($this->listeners[$name][$priority] as $i => $callable) {
if ($listener === $callable) {
unset($this->listeners[$name][$i]);
}
}
ksort($this->listeners[$name]);
}
/**
* Notifies all listeners of a given event.
*
* @param RokCommon_Event $event A RokCommon_Event instance
*
* @return RokCommon_Event The RokCommon_Event instance
*/
public function notify(RokCommon_Event $event)
{
foreach ($this->listeners[$event->getName()] as $priority_listeners) {
foreach ($priority_listeners as $listener) {
call_user_func($listener, $event);
}
}
return $event;
}
/**
* Notifies all listeners of a given event until one returns a non null value.
*
* @param RokCommon_Event $event A RokCommon_Event instance
*
* @return RokCommon_Event The RokCommon_Event instance
*/
public function notifyUntil(RokCommon_Event $event)
{
if (isset($this->listeners[$event->getName()])) {
foreach ($this->listeners[$event->getName()] as $priority_listeners) {
foreach ($priority_listeners as $listener) {
if (call_user_func($listener, $event)) {
$event->setProcessed(true);
break;
}
}
}
}
return $event;
}
/**
* Filters a value by calling all listeners of a given event.
*
* @param RokCommon_Event $event A RokCommon_Event instance
* @param mixed $value The value to be filtered
*
* @return RokCommon_Event The RokCommon_Event instance
*/
public function filter(RokCommon_Event $event, $value)
{
if (isset($this->listeners[$event->getName()])) {
foreach ($this->listeners[$event->getName()] as $priority_listeners) {
foreach ($priority_listeners as $listener) {
$value = call_user_func_array($listener, array($event, $value));
}
}
$event->setReturnValue($value);
}
return $event;
}
/**
* Returns true if the given event name has some listeners.
*
* @param string $name The event name
*
* @return Boolean true if some listeners are connected, false otherwise
*/
public function hasListeners($name)
{
if (!isset($this->listeners[$name])) {
$this->listeners[$name] = array();
}
$listeners = new RecursiveArrayIterator($this->listeners[$name]);
return (boolean)iterator_count($listeners);
}
/**
* Returns all listeners associated with a given event name.
*
* @param string $name The event name
*
* @return array An array of listeners
*/
public function getListeners($name)
{
$ret = array();
if (!isset($this->listeners[$name])) {
return $ret;
}
foreach ($this->listeners[$name] as $priority_listeners) {
foreach ($priority_listeners as $listener) {
$ret = $listener;
}
}
return $ret;
}
}