*/
public Addressbook createAddressbook (final Addressbook addressbook) throws AddressbookNameAlreadyUsedException;
+ /**
+ * Checks whether the given address book id is used (means available).
+ * <p>
+ * @param addressbookId Address book id to check
+ * @return Whether the id is valid
+ */
+ public boolean isAddressbookIdUsed (final Long addressbookId);
+
/**
* Checks if the given address book's name is already used by the user.
* <p>