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/**
* BEdita, API-first content management framework
* Copyright 2017-2021 ChannelWeb Srl, Chialab Srl
*
* This file is part of BEdita: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* See LICENSE.LGPL or <http://gnu.org/licenses/lgpl-3.0.html> for more details.
*/
namespace BEdita\Core;
/**
* Singleton class.
*
* @since 4.0.0
* @see https://github.com/sebastianbergmann/phpunit/tree/5.6/tests/_files/Singleton.php
*/
trait SingletonTrait
{
/**
* Singleton instance.
*
* @var static|null
*/
private static $uniqueInstance = null;
/**
* Singleton constructor.
*
* The constructor is declared private in order to
* prevent new instances from being created.
*
* @codeCoverageIgnore
*/
final protected function __construct()
{
}
/**
* Singleton clone method.
*
* This method is declared private in order to
* prevent existing instances from being cloned.
*
* @return void
* @codeCoverageIgnore
*/
final private function __clone()
{
}
/**
* Singleton getter.
*
* Use this method in order to get the singleton instance
*
* @return static|null
*/
final public static function getInstance()
{
if (static::$uniqueInstance === null) {
static::$uniqueInstance = new static();
}
return static::$uniqueInstance;
}
}