-# A generalization of PGError, and whatever MySQL and the other
-# databases might eventually use.
-class DatabaseError < StandardError
+# Username is syntactically invalid.
+class InvalidUserError < StandardError
end
-
-# Perhaps surprisingly, used to indicate that an user name is
-# invalid.
-class InvalidUserError < StandardError
+# Domain is syntactically invalid.
+class InvalidDomainError < StandardError
end
-# Used to indicate that an user does not exist on the filesystem.
+# Used to indicate that an user does not exist.
class NonexistentUserError < StandardError
end
-
-# Used to indicate that a domain does not exist on the filesystem.
+# Used to indicate that a domain does not exist.
class NonexistentDomainError < StandardError
end
+
+
+# When you try to rename a user on top of one that already exists.
+class UserAlreadyExistsError < StandardError
+end