Viewing file:  Observable.php (1.15 KB) -rw-rw-rw-
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<?php
/**
* @package SPLIB
* @version $Id: Observable.php,v 1.1 2003/12/12 08:06:05 kevin Exp $
*/
/**
* Base Observerable class
* @abstract
* @package SPLIB
*/
class Observable {
/**
* Array of Observers
* @access private
* @var array
*/
var $observers;
/**
* Constructs the Observerable object
*/
function Observable () {
$this->observers=array();
}
/**
* Calls the update() function using the reference to each
* registered observer, passing an optional argument for the
* event - used by children of Observable
* @param mixed (optional) describing the event
* @return void
* @access public
*/
function notifyObservers ($arg = NULL) {
$keys = array_keys($this->observers);
foreach ($keys as $key) {
$this->observers[$key]->update($this,$arg);
}
}
/**
* Attaches an observer to the observable
* @param Observer object built from subclass of Observer
* @return void
* @access public
*/
function addObserver (& $observer) {
$this->observers[]=& $observer;
}
}
?>
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