public function setUser($user)
{
if (!($user instanceof UserInterface || (is_object($user) && method_exists($user, '__toString')) || is_string($user))) {
throw new \InvalidArgumentException('$user must be an instanceof UserInterface, an object implementing a __toString method, or a primitive string.');
}
if (null === $this->user) {
$changed = false;
} elseif ($this->user instanceof UserInterface) {
if (!$user instanceof UserInterface) {
$changed = true;
} else {
$changed = $this->hasUserChanged($user);
}
} elseif ($user instanceof UserInterface) {
$changed = true;
} else {
$changed = (string) $this->user !== (string) $user;
}
if ($changed) {
$this->setAuthenticated(false);
}
$this->user = $user;
}