/**
* Transforms a collection of recipients into a string
*
* @param Collection $recipients
*
* @return string
*/
public function transform($recipients)
{
if ($recipients->count() == 0) {
return "";
}
$usernames = array();
foreach ($recipients as $recipient) {
$usernames[] = $this->userToUsernameTransformer->transform($recipient);
}
return implode(', ', $usernames);
}
/**
* Transforms a collection of UserInterface instances into a list of usernames.
*
* @param UserInterface[] $value UserInterface instances
*
* @return string|null Usernames
*
* @throws UnexpectedTypeException if one of the given value is not a UserInterface instance
*/
public function transform($value)
{
if (null === $value) {
return null;
}
if (!is_array($value) && !$value instanceof \Traversable) {
throw new UnexpectedTypeException($value, 'array or Traversable');
}
$usernames = [];
foreach ($value as $user) {
$usernames[] = $this->userToUsernameTransformer->transform($user);
}
return implode(', ', $usernames);
}
