class ThrowPromise

class ThrowPromise implements PromiseInterface {
    private $exception;
    
    /**
     * @var Instantiator|null
     */
    private $instantiator;
    
    /**
     * Initializes promise.
     *
     * @param string|\Throwable $exception Exception class name or instance
     *
     * @throws \Prophecy\Exception\InvalidArgumentException
     *
     * @phpstan-param class-string<\Throwable>|\Throwable $exception
     */
    public function __construct($exception) {
        if (is_string($exception)) {
            if (!class_exists($exception) && !interface_exists($exception) || !$this->isAValidThrowable($exception)) {
                throw new InvalidArgumentException(sprintf('Exception / Throwable class or instance expected as argument to ThrowPromise, but got %s.', $exception));
            }
        }
        elseif (!$exception instanceof \Exception && !$exception instanceof \Throwable) {
            throw new InvalidArgumentException(sprintf('Exception / Throwable class or instance expected as argument to ThrowPromise, but got %s.', is_object($exception) ? get_class($exception) : gettype($exception)));
        }
        $this->exception = $exception;
    }
    public function execute(array $args, ObjectProphecy $object, MethodProphecy $method) {
        if (is_string($this->exception)) {
            $classname = $this->exception;
            $reflection = new ReflectionClass($classname);
            $constructor = $reflection->getConstructor();
            if ($constructor === null || $constructor->isPublic() && 0 == $constructor->getNumberOfRequiredParameters()) {
                throw $reflection->newInstance();
            }
            if (!$this->instantiator) {
                $this->instantiator = new Instantiator();
            }
            throw $this->instantiator
                ->instantiate($classname);
        }
        throw $this->exception;
    }
    
    /**
     * @param string $exception
     *
     * @return bool
     */
    private function isAValidThrowable($exception) {
        return is_a($exception, 'Exception', true) || is_a($exception, 'Throwable', true);
    }

}