File: UUID.hs

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git-annex 5.20141125
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{- git-annex UUID type
 -
 - Copyright 2011 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Types.UUID where

import qualified Data.Map as M
import qualified Data.UUID as U
import Data.Maybe

-- A UUID is either an arbitrary opaque string, or UUID info may be missing.
data UUID = NoUUID | UUID String
	deriving (Eq, Ord, Show, Read)

fromUUID :: UUID -> String
fromUUID (UUID u) = u
fromUUID NoUUID = ""

toUUID :: String -> UUID
toUUID [] = NoUUID
toUUID s = UUID s

isUUID :: String -> Bool
isUUID = isJust . U.fromString

type UUIDMap = M.Map UUID String