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<?php
/**
* Copyright (C) 2015 Deciso B.V.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
namespace OPNsense\Core;
/**
* Class Singleton provides singleton pattern, be careful with usage.
* @package Core
*/
abstract class Singleton
{
/**
* holder for singleton objects
* @var static
*/
private static $instances;
/**
* Cannot construct Singleton, use getInstance instead
*/
final private function __construct()
{
// call init on newly created object
static::init();
}
/**
* Do not clone
* @throws \Exception
*/
private function __clone()
{
throw new \Exception("An instance of " . get_called_class() . " cannot be cloned.");
}
/**
* get (new) instance
* @return object
*/
public static function getInstance()
{
$className = get_called_class();
if (isset(self::$instances[$className]) == false) {
self::$instances[$className] = new static();
}
return self::$instances[$className];
}
/**
* by default there must be an inherited init method
* so an extended class could simply
* specify its own init
*/
protected function init()
{
}
}
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