<?php
/*
Singleton.lib, DomCore, the WebAbility(r) Core System
Contains the singleton pattern class
(c) 2008-2012 Philippe Thomassigny
This file is part of DomCore
DomCore is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
DomCore is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DomCore. If not, see <http://www.gnu.org/licenses/>.
*/
/* @UML_Box -- Do not edit
|------------------------------------------------------------------|
| Singleton : singleton pattern class |
|------------------------------------------------------------------|
| - ::instance : array(Singleton) |
|------------------------------------------------------------------|
| + new Singleton() |
| + ::getInstance($name: string): Singleton extended |
| + __clone(): object |
|------------------------------------------------------------------|
@End_UML_Box */
class Singleton extends WAObject
{
private static $instance = array();
public function __construct()
{
if (isset(self::$instance[get_class($this)]))
throw new PatternError(WAMessage::getMessage('Singleton.noclone').get_class($this));
parent::__construct();
self::$instance[get_class($this)] = $this;
}
public static function getInstance($classname = null)
{
if (!$classname)
$classname = get_called_class();
if (!isset(self::$instance[$classname]))
new $classname();
return self::$instance[$classname];
}
public function __clone()
{
throw new PatternError(WAMessage::getMessage('Singleton.noclone').get_class($this));
}
}
?>
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