Class PLens<S,T,A,B>

java.lang.Object

io.atlassian.fugue.optic.PLens<S,T,A,B>

Type Parameters:

S - the source of a PLens

T - the modified source of a PLens

A - the target of a PLens

B - the modified target of a PLens

Direct Known Subclasses:

Lens

public abstract class PLens<S,T,A,B>
extends Object

A PLens can be seen as a pair of functions: - `get: S => A` i.e. from an `S`, we can extract an `A` - `set: (B, S) => T` i.e. if we replace an `A` by a `B` in an `S`, we obtain a `T`

A PLens could also be defined as a weaker PIso where set requires an additional parameter than reverseGet.

PLens stands for Polymorphic Lens as it set and modify methods change a type `A` to `B` and `S` to `T`. Lens is a PLens restricted to monomorphic updates.

A PLens is also a valid Getter, Fold, POptional, PTraversal and PSetter

Typically a PLens or Lens can be defined between a Product (e.g. case class, tuple, HList) and one of it is component.

Constructor Summary

Constructors

Constructor	Description
PLens()

Method Summary

Modifier and Type	Method	Description
final Fold<S,A>	asFold()	view a PLens as a Fold
final Getter<S,A>	asGetter()	view a PLens as a Getter
POptional<S,T,A,B>	asOptional()	view a PLens as an POptional
PSetter<S,T,A,B>	asSetter()	view a PLens as a PSetter
PTraversal<S,T,A,B>	asTraversal()	view a PLens as a PTraversal
final <C> Fold<S,C>	composeFold(Fold<A,C> other)	compose a PLens with a Fold
final <C> Getter<S,C>	composeGetter(Getter<A,C> other)	compose a PLens with a Getter
final <C,D> PLens<S,T,C,D>	composeIso(PIso<A,B,C,D> other)	compose a PLens with an PIso
final <C,D> PLens<S,T,C,D>	composeLens(PLens<A,B,C,D> other)	compose a PLens with a PLens
final <C,D> POptional<S,T,C,D>	composeOptional(POptional<A,B,C,D> other)	compose a PLens with an POptional
final <C,D> POptional<S,T,C,D>	composePrism(PPrism<A,B,C,D> other)	compose a PLens with a PPrism
final <C,D> PSetter<S,T,C,D>	composeSetter(PSetter<A,B,C,D> other)	compose a PLens with a PSetter
final <C,D> PTraversal<S,T,C,D>	composeTraversal(PTraversal<A,B,C,D> other)	compose a PLens with a PTraversal
abstract A	get(S s)	get the target of a PLens
abstract Function<S,T>	modify(Function<A,B> f)	modify polymorphically the target of a PLens using a function
abstract <L> Function<S, Either<L,T>>	modifyEitherF(Function<A, Either<L,B>> f)	modify polymorphically the target of a PLens with an Applicative function
abstract <C> Function<S, Function<C,T>>	modifyFunctionF(Function<A, Function<C,B>> f)	modify polymorphically the target of a PLens with an Applicative function
abstract Function<S, Iterable<T>>	modifyIterableF(Function<A, Iterable<B>> f)	modify polymorphically the target of a PLens with an Applicative function
abstract Function<S, Option<T>>	modifyOptionF(Function<A, Option<B>> f)	modify polymorphically the target of a PLens with an Applicative function
abstract Function<S, Pair<T,T>>	modifyPairF(Function<A, Pair<B,B>> f)	modify polymorphically the target of a PLens with an Applicative function
abstract Function<S, Supplier<T>>	modifySupplierF(Function<A, Supplier<B>> f)	modify polymorphically the target of a PLens with an Applicative function
static <S,T> PLens<S,T,S,T>	pId()
static <S,T,A,B> PLens<S,T,A,B>	pLens(Function<S,A> get, Function<B, Function<S,T>> set)	create a PLens using a pair of functions: one to get the target, one to set the target.
abstract Function<S,T>	set(B b)	set polymorphically the target of a PLens using a function
final <S1,T1> PLens<Either<S,S1>, Either<T,T1>, A, B>	sum(PLens<S1,T1,A,B> other)	join two PLens with the same target

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PLens

PLens()

Method Details

get

public abstract A get(S s)

get the target of a PLens

set

public abstract Function<S,T> set(B b)

set polymorphically the target of a PLens using a function

modifyFunctionF

public abstract <C> Function<S, Function<C,T>> modifyFunctionF(Function<A, Function<C,B>> f)

modify polymorphically the target of a PLens with an Applicative function

modifyEitherF

public abstract <L> Function<S, Either<L,T>> modifyEitherF(Function<A, Either<L,B>> f)

modify polymorphically the target of a PLens with an Applicative function

modifyOptionF

public abstract Function<S, Option<T>> modifyOptionF(Function<A, Option<B>> f)

modify polymorphically the target of a PLens with an Applicative function

modifyIterableF

public abstract Function<S, Iterable<T>> modifyIterableF(Function<A, Iterable<B>> f)

modify polymorphically the target of a PLens with an Applicative function

modifySupplierF

public abstract Function<S, Supplier<T>> modifySupplierF(Function<A, Supplier<B>> f)

modify polymorphically the target of a PLens with an Applicative function

modifyPairF

public abstract Function<S, Pair<T,T>> modifyPairF(Function<A, Pair<B,B>> f)

modify polymorphically the target of a PLens with an Applicative function

modify

public abstract Function<S,T> modify(Function<A,B> f)

modify polymorphically the target of a PLens using a function

sum

public final <S1,T1>
PLens<Either<S,S1>, Either<T,T1>, A, B> sum(PLens<S1,T1,A,B> other)

join two PLens with the same target

composeFold

public final <C> Fold<S,C> composeFold(Fold<A,C> other)

compose a PLens with a Fold

composeGetter

public final <C> Getter<S,C> composeGetter(Getter<A,C> other)

compose a PLens with a Getter

composeSetter

public final <C,D> PSetter<S,T,C,D> composeSetter(PSetter<A,B,C,D> other)

compose a PLens with a PSetter

composeTraversal

public final <C,D> PTraversal<S,T,C,D> composeTraversal(PTraversal<A,B,C,D> other)

compose a PLens with a PTraversal

composeOptional

public final <C,D> POptional<S,T,C,D> composeOptional(POptional<A,B,C,D> other)

compose a PLens with an POptional

composePrism

public final <C,D> POptional<S,T,C,D> composePrism(PPrism<A,B,C,D> other)

compose a PLens with a PPrism

composeLens

public final <C,D> PLens<S,T,C,D> composeLens(PLens<A,B,C,D> other)

compose a PLens with a PLens

composeIso

public final <C,D> PLens<S,T,C,D> composeIso(PIso<A,B,C,D> other)

compose a PLens with an PIso

asFold

public final Fold<S,A> asFold()

view a PLens as a Fold

asGetter

public final Getter<S,A> asGetter()

view a PLens as a Getter

asSetter

public PSetter<S,T,A,B> asSetter()

view a PLens as a PSetter

asTraversal

public PTraversal<S,T,A,B> asTraversal()

view a PLens as a PTraversal

asOptional

public POptional<S,T,A,B> asOptional()

view a PLens as an POptional

pId

public static <S,T> PLens<S,T,S,T> pId()

pLens

public static <S,T,A,B> PLens<S,T,A,B> pLens(Function<S,A> get,
 Function<B, Function<S,T>> set)

create a PLens using a pair of functions: one to get the target, one to set the target.