Class SetLens

java.lang.Object

com.jnape.palatable.lambda.optics.lenses.SetLens

public final class SetLens
extends Object

Lenses that operate on Sets.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	SetLens()

Method Summary

Modifier and Type	Method	Description
static <A> Lens.Simple<Set<A>,Boolean>	contains(A a)	A lens that focuses on whether a Set contains some value a.
static <A, SetA extends Set<A>> Lens.Simple<SetA,Boolean>	contains(Fn1<? super SetA, ? extends SetA> copyFn, A a)	A lens that focuses on whether a Set contains some value a.

Methods inherited from class Object

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

Constructor Details

SetLens

private SetLens()

Method Details

contains

public static <A, SetA extends Set<A>>
Lens.Simple<SetA,Boolean> contains(Fn1<? super SetA, ? extends SetA> copyFn,
 A a)

A lens that focuses on whether a Set contains some value a. Note that copyFn is used to avoid mutating the Set in question.

Type Parameters:

A - the value type

SetA - the set to focus on

Parameters:

copyFn - the copy function

a - the value in question

Returns:

a lens that focuses on a value's inclusion in a given Set

contains

public static <A> Lens.Simple<Set<A>,Boolean> contains(A a)

A lens that focuses on whether a Set contains some value a. Like contains(Fn1, Object) but with an implicit copy function that produces HashSets.

Type Parameters:

A - the value type

Parameters:

a - the value in question

Returns:

a lens that focuses on a value's inclusion in a given Set