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<?php
namespace Objectiv\Plugins\Checkout;
/**
* Enforces a single instance of an object. Useful for mission critical objects that should never be duplicated beyond
* plugin initialization
*
* @link objectiv.co
* @since 1.0.0
* @package Objectiv\BoosterSeat\Base
* @author Brandon Tassone <[email protected]>
*/
abstract class SingletonAbstract {
/**
* @since 1.0.0
* @access private
* @var null
*/
protected static $instance = array();
/**
* Singleton constructor. Just a stub. Do not fill with logic
*
* @since 1.0.0
* @access private
*/
private function __construct() {}
/**
* Clone method. Just a stub. Do not fill with logic
*
* @since 1.0.0
* @access private
*/
private function __clone() {}
/**
* Wakeup method. Just a stub. Do not fill with logic
*
* @since 1.0.0
* @access private
*/
public function __wakeup() {}
/**
* Returns the class instantiated instance. Will return the first instance generated, and nothing else.
*
* @since 1.0.0
* @access public
* @return null|static
*/
final public static function instance() {
$class = (string) get_called_class();
if ( ! array_key_exists( $class, self::$instance ) ) {
self::$instance[ $class ] = new static();
}
return self::$instance[ $class ];
}
}
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