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<?php
namespace Core;
/**
* Event listener interface
*
* @package core
* @author Frederic Guillot
*/
interface Listener {
public function execute(array $data);
}
/**
* Event dispatcher class
*
* @package core
* @author Frederic Guillot
*/
class Event
{
/**
* Contains all listeners
*
* @access private
* @var array
*/
private $listeners = array();
/**
* The last triggered event
*
* @access private
* @var string
*/
private $lastEvent = '';
/**
* Triggered events list
*
* @access private
* @var array
*/
private $events = array();
/**
* Attach a listener object to an event
*
* @access public
* @param string $eventName Event name
* @param Listener $listener Object that implements the Listener interface
*/
public function attach($eventName, Listener $listener)
{
if (! isset($this->listeners[$eventName])) {
$this->listeners[$eventName] = array();
}
$this->listeners[$eventName][] = $listener;
}
/**
* Trigger an event
*
* @access public
* @param string $eventName Event name
* @param array $data Event data
*/
public function trigger($eventName, array $data)
{
$this->lastEvent = $eventName;
$this->events[] = $eventName;
if (isset($this->listeners[$eventName])) {
foreach ($this->listeners[$eventName] as $listener) {
$listener->execute($data); // TODO: keep an history of executed actions for unit test
}
}
}
/**
* Get the last fired event
*
* @access public
* @return string Event name
*/
public function getLastTriggeredEvent()
{
return $this->lastEvent;
}
/**
* Get a list of triggered events
*
* @access public
* @return array
*/
public function getTriggeredEvents()
{
return $this->events;
}
/**
* Check if a listener bind to an event
*
* @access public
* @param string $eventName Event name
* @param mixed $instance Instance name or object itself
* @return bool Yes or no
*/
public function hasListener($eventName, $instance)
{
if (isset($this->listeners[$eventName])) {
foreach ($this->listeners[$eventName] as $listener) {
if ($listener instanceof $instance) {
return true;
}
}
}
return false;
}
}
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