/**
* @param Token $token
*
* @throws DomainException If the token is already in play
*/
public function add(Token $token)
{
$number = $token->number();
if ($this->has($token->owner(), $number)) {
throw new DomainException(sprintf('Token with number "%d" is already in play.', $number->value()));
}
$tokens = $this->tokensFor($token->owner());
$tokens[$number->value()] = $token;
$this->tokensOnTrack->attach($token->owner(), $tokens);
}
