/**
* get the display name for the user, if no specific display name is set it will fallback to the user id
*
* @return string
*/
public function getDisplayName()
{
if (!isset($this->displayName)) {
$displayName = '';
if ($this->backend and $this->backend->implementsActions(\OC\User\Backend::GET_DISPLAYNAME)) {
// get display name and strip whitespace from the beginning and end of it
$backendDisplayName = $this->backend->getDisplayName($this->uid);
if (is_string($backendDisplayName)) {
$displayName = trim($backendDisplayName);
}
}
if (!empty($displayName)) {
$this->displayName = $displayName;
} else {
$this->displayName = $this->uid;
}
}
return $this->displayName;
}
