Maintainer	Toshio Ito <debug.ito@gmail.com>
Safe Haskell	None
Language	Haskell2010

Data.Greskell.AsLabel

Contents

AsLabel
Re-exports

Description

Since: 0.2.2.0

Synopsis

newtype AsLabel a = AsLabel {
- unAsLabel :: Text
}
type SelectedMap = PMap Single
lookup :: (PMapKey k, NonEmptyLike c) => k -> PMap c v -> Maybe v
lookupM :: (PMapKey k, NonEmptyLike c, MonadThrow m) => k -> PMap c v -> m v
lookupAs :: (PMapKey k, NonEmptyLike c, PMapValue k ~ a, FromGraphSON a) => k -> PMap c GValue -> Either PMapLookupException a
lookupAsM :: (PMapKey k, NonEmptyLike c, PMapValue k ~ a, FromGraphSON a, MonadThrow m) => k -> PMap c GValue -> m a
data PMapLookupException
- = PMapNoSuchKey Text
- | PMapParseError Text String

AsLabel

newtype AsLabel a Source #

AsLabel a represents a label string used in .as step pointing to the data of type a.

Constructors

AsLabel
Fields unAsLabel :: Text

Instances

Functor AsLabel Source #	Unsafely convert the phantom type.
Instance details Defined in Data.Greskell.AsLabel Methods fmap :: (a -> b) -> AsLabel a -> AsLabel b # (<$) :: a -> AsLabel b -> AsLabel a #
Eq (AsLabel a) Source #
Instance details Defined in Data.Greskell.AsLabel Methods (==) :: AsLabel a -> AsLabel a -> Bool # (/=) :: AsLabel a -> AsLabel a -> Bool #
Ord (AsLabel a) Source #
Instance details Defined in Data.Greskell.AsLabel Methods compare :: AsLabel a -> AsLabel a -> Ordering # (<) :: AsLabel a -> AsLabel a -> Bool # (<=) :: AsLabel a -> AsLabel a -> Bool # (>) :: AsLabel a -> AsLabel a -> Bool # (>=) :: AsLabel a -> AsLabel a -> Bool # max :: AsLabel a -> AsLabel a -> AsLabel a # min :: AsLabel a -> AsLabel a -> AsLabel a #
Show (AsLabel a) Source #
Instance details Defined in Data.Greskell.AsLabel Methods showsPrec :: Int -> AsLabel a -> ShowS # show :: AsLabel a -> String # showList :: [AsLabel a] -> ShowS #
IsString (AsLabel a) Source #	Since: 1.0.0.0
Instance details Defined in Data.Greskell.AsLabel Methods fromString :: String -> AsLabel a #
ToGreskell (AsLabel a) Source #	Returns the `Text` as a Gremlin string.
Instance details Defined in Data.Greskell.AsLabel Associated Types type GreskellReturn (AsLabel a) :: Type # Methods toGreskell :: AsLabel a -> Greskell (GreskellReturn (AsLabel a)) #
PMapKey (AsLabel a) Source #	Since: 1.0.0.0
Instance details Defined in Data.Greskell.AsLabel Associated Types type PMapValue (AsLabel a) :: Type Source # Methods keyText :: AsLabel a -> Text Source #
type GreskellReturn (AsLabel a) Source #
Instance details Defined in Data.Greskell.AsLabel type GreskellReturn (AsLabel a) = Text
type PMapValue (AsLabel a) Source #
Instance details Defined in Data.Greskell.AsLabel type PMapValue (AsLabel a) = a

type SelectedMap = PMap Single Source #

A map keyed with AsLabel. Obtained from .select step, for example.

Re-exports

lookup :: (PMapKey k, NonEmptyLike c) => k -> PMap c v -> Maybe v Source #

Lookup the first value for the key from PMap.

lookupM :: (PMapKey k, NonEmptyLike c, MonadThrow m) => k -> PMap c v -> m v Source #

MonadThrow version of lookup. If there is no value for the key, it throws PMapNoSuchKey.

lookupAs :: (PMapKey k, NonEmptyLike c, PMapValue k ~ a, FromGraphSON a) => k -> PMap c GValue -> Either PMapLookupException a Source #

Lookup the value and parse it into a.

lookupAsM :: (PMapKey k, NonEmptyLike c, PMapValue k ~ a, FromGraphSON a, MonadThrow m) => k -> PMap c GValue -> m a Source #

MonadThrow version of lookupAs.

data PMapLookupException Source #

An Exception raised when looking up values from PMap.

Since: 1.0.0.0

Constructors

PMapNoSuchKey Text	The `PMap` doesn't have the given key.
PMapParseError Text String	Failed to parse the value into the type that the `PMapKey` indicates. The `Text` is the key, and the `String` is the error message.

Instances

Eq PMapLookupException Source #
Instance details Defined in Data.Greskell.PMap Methods (==) :: PMapLookupException -> PMapLookupException -> Bool # (/=) :: PMapLookupException -> PMapLookupException -> Bool #
Ord PMapLookupException Source #
Instance details Defined in Data.Greskell.PMap Methods compare :: PMapLookupException -> PMapLookupException -> Ordering # (<) :: PMapLookupException -> PMapLookupException -> Bool # (<=) :: PMapLookupException -> PMapLookupException -> Bool # (>) :: PMapLookupException -> PMapLookupException -> Bool # (>=) :: PMapLookupException -> PMapLookupException -> Bool # max :: PMapLookupException -> PMapLookupException -> PMapLookupException # min :: PMapLookupException -> PMapLookupException -> PMapLookupException #
Show PMapLookupException Source #
Instance details Defined in Data.Greskell.PMap Methods showsPrec :: Int -> PMapLookupException -> ShowS # show :: PMapLookupException -> String # showList :: [PMapLookupException] -> ShowS #
Exception PMapLookupException Source #
Instance details Defined in Data.Greskell.PMap Methods toException :: PMapLookupException -> SomeException # fromException :: SomeException -> Maybe PMapLookupException # displayException :: PMapLookupException -> String #