SingletonTrait.php

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<?php

declare(strict_types=1);
namespace ILIAS\GlobalScreen;

use ReflectionClass;

trait SingletonTrait
{
    private static $services = [];

    private function get(string $class_name) : object
    {
        if (!$this->has($class_name)) {
            self::$services[$class_name] = new $class_name();
        }

        return self::$services[$class_name];
    }

    private function getWithArgument(string $class_name, $argument) : object
    {
        if (!$this->has($class_name)) {
            self::$services[$class_name] = new $class_name($argument);
        }

        return self::$services[$class_name];
    }

    private function getWithMultipleArguments(string $class_name, array $arguments) : object
    {
        if (!$this->has($class_name)) {
            $i = new ReflectionClass($class_name);

            self::$services[$class_name] = $i->newInstanceArgs($arguments);
        }

        return self::$services[$class_name];
    }

    private function has(string $class_name) : bool
    {
        return isset(self::$services[$class_name]);
    }
}