/**
  * Changes the owner of this address.
  *
  * @param int $uid
  *   The new owner of the address.
  *
  * @access public
  * @return UcAddressesAddressBook
  *   The address book the address will belong to;
  *   or NULL if the address was already owned.
  */
 public function setOwner($uid)
 {
     // The owner of this address may only be changed if it doesn't belong to
     // anyone yet.
     if ($this->isOwned()) {
         // Changing the owner not allowed.
         return;
     }
     // Setting the owner goes via the address book.
     return $this->addressBook->setAddressOwner($this, $uid);
 }