public function __construct($id, $sourceId = null, \Exception $previous = null, array $alternatives = array()) {
if (null === $sourceId) {
$msg = sprintf('You have requested a non-existent service "%s".', $id);
}
else {
$msg = sprintf('The service "%s" has a dependency on a non-existent service "%s".', $sourceId, $id);
}
if ($alternatives) {
if (1 == count($alternatives)) {
$msg .= ' Did you mean this: "';
}
else {
$msg .= ' Did you mean one of these: "';
}
$msg .= implode('", "', $alternatives) . '"?';
}
parent::__construct($msg, 0, $previous);
$this->id = $id;
$this->sourceId = $sourceId;
}