Package eu.bandm.tools.ops

Class Functions

java.lang.Object

eu.bandm.tools.ops.Functions

public abstract class Functions
extends Object

Library of constants and combinators for classes implementing Function.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Functions.MemoizedBiFunction<A,B,C>

Method Summary

Modifier and Type	Method	Description
static <A, B> Function<A,B>	adjust(Function<? super A,? extends B> f)
static <A> Function<Iterable<? extends A>,A>	arbitrary()
static <A> Semigroup<A>	asSemigroup(BiFunction<? super A,? super A,? extends A> f)
static <A, B, C> BiFunction<A,B,C>	binConstant(C result)
static <A, B, C> BiFunction<Function<? super A,? extends B>,Function<? super B,? extends C>,Function<A,C>>	compose()
static <A, B, C> InvertibleFunction<A,C>	compose(InvertibleFunction<A,B> inner, InvertibleFunction<B,C> outer)
static <A, B, C> RetractableFunction<A,C>	compose(RetractableFunction<A,B> inner, RetractableFunction<B,C> outer)
static <A, B, C> SectionableFunction<A,C>	compose(SectionableFunction<A,B> inner, SectionableFunction<B,C> outer)
static <A, B, C, D> BiFunction<A,B,D>	compose(BiFunction<? super A,? super B,? extends C> f, Function<? super C,? extends D> g)
static <A, B, C> Function<A,C>	compose(Function<? super A,? extends B> inner, Function<? super B,? extends C> outer)
static <A, B, C, D> Function<A,D>	compose(Function<? super A,? extends B> f1, Function<? super B,? extends C> f2, Function<? super C,? extends D> f3)
static <A, B, C, D, E> Function<A,E>	compose(Function<? super A,? extends B> f1, Function<? super B,? extends C> f2, Function<? super C,? extends D> f3, Function<? super D,? extends E> f4)
static <A, B, C, D, E> BiFunction<A,C,E>	compose(Function<? super A,? extends B> f, Function<? super C,? extends D> g, BiFunction<? super B,? super D,? extends E> h)
static <A, B> Function<A,B>	constant(B result)
static <A, B, C> Function<A,Function<B,C>>	curry(BiFunction<A,B,C> f)
static <A, B> Function<A,B>	defaultTo(B def, Function<? super A,? extends B> fun)
static <A, B> Predicate<A>	domain(Function<? super A,? extends B> fun)
static <A, B> Function<A,B>	fail()
static <A, B, C> BiFunction<B,A,C>	flip(BiFunction<A,B,C> f)
static <A> InvertibleFunction<A,A>	identity()
static <A> InvertibleFunction<A,A>	identity(Class<A> cls)
static <A, B> InvertibleFunction<B,A>	inverse(InvertibleFunction<A,B> fun)
static <A, B> SectionableFunction<B,A>	inverse(RetractableFunction<A,B> fun)
static <A, B> RetractableFunction<B,A>	inverse(SectionableFunction<A,B> fun)
static <A, B, C> Function<A,C>	leftSection(BiFunction<? super A,? super B,? extends C> f, B arg)
static <A, B> Function<A,B>	liftNull(Function<A,B> fun)	Returns a variant of the given function that handles null arguments.
static <A, B, C> Functions.MemoizedBiFunction<A,B,C>	memoize(BiFunction<A,B,C> fun)
static <A, B> Function<A,B>	memoize(Function<A,B> fun)
static <A, B> Function<A,B>	override(Function<? super A,? extends B> first, Function<? super A,? extends B> second)
static <A, B> Function<A,B>	restrict(Function<? super A,? extends B> fun, Predicate<? super A> cond)
static <A, B, C> Function<B,C>	rightSection(BiFunction<? super A,? super B,? extends C> f, A a)
static <A, B> Function<A,B>	strict(Function<A,B> fun)
static <A> Function<A,A>	trace(String label)
static <A, B, C> Function<Tuple2<A,B>,C>	tupleConvert(BiFunction<? super A,? super B,? extends C> f)
static <A, B, C> BiFunction<A,B,C>	tupleConvert(Function<? super Tuple2<? super A,? super B>,? extends C> f)
static <A, B, C> Function<A,Tuple2<B,C>>	tupling(Function<? super A,? extends B> f, Function<? super A,? extends C> g)
static <A, B, C> BiFunction<A,B,C>	uncurry(Function<A,Function<B,C>> f)
static <A, B> Function<A,B>	undef(String n)

Methods inherited from class java.lang.Object

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

Method Details

undef

public static <A,
B> Function<A,B> undef(String n)

identity

public static <A> InvertibleFunction<A,A> identity()

identity

public static <A> InvertibleFunction<A,A> identity(Class<A> cls)

compose

public static <A,
B,
C> Function<A,C> compose(Function<? super A,? extends B> inner,
 Function<? super B,? extends C> outer)

compose

public static <A,
B,
C> RetractableFunction<A,C> compose(RetractableFunction<A,B> inner,
 RetractableFunction<B,C> outer)

compose

public static <A,
B,
C> SectionableFunction<A,C> compose(SectionableFunction<A,B> inner,
 SectionableFunction<B,C> outer)

compose

public static <A,
B,
C> InvertibleFunction<A,C> compose(InvertibleFunction<A,B> inner,
 InvertibleFunction<B,C> outer)

compose

public static <A,
B,
C>
BiFunction<Function<? super A,? extends B>,Function<? super B,? extends C>,Function<A,C>> compose()

curry

public static <A,
B,
C> Function<A,Function<B,C>> curry(BiFunction<A,B,C> f)

uncurry

public static <A,
B,
C> BiFunction<A,B,C> uncurry(Function<A,Function<B,C>> f)

constant

public static <A,
B> Function<A,B> constant(B result)

binConstant

public static <A,
B,
C> BiFunction<A,B,C> binConstant(C result)

flip

public static <A,
B,
C> BiFunction<B,A,C> flip(BiFunction<A,B,C> f)

rightSection

public static <A,
B,
C> Function<B,C> rightSection(BiFunction<? super A,? super B,? extends C> f,
 A a)

leftSection

public static <A,
B,
C> Function<A,C> leftSection(BiFunction<? super A,? super B,? extends C> f,
 B arg)

compose

public static <A,
B,
C,
D> BiFunction<A,B,D> compose(BiFunction<? super A,? super B,? extends C> f,
 Function<? super C,? extends D> g)

compose

public static <A,
B,
C,
D,
E> BiFunction<A,C,E> compose(Function<? super A,? extends B> f,
 Function<? super C,? extends D> g,
 BiFunction<? super B,? super D,? extends E> h)

tupleConvert

public static <A,
B,
C> Function<Tuple2<A,B>,C> tupleConvert(BiFunction<? super A,? super B,? extends C> f)

tupleConvert

public static <A,
B,
C> BiFunction<A,B,C> tupleConvert(Function<? super Tuple2<? super A,? super B>,? extends C> f)

tupling

public static <A,
B,
C> Function<A,Tuple2<B,C>> tupling(Function<? super A,? extends B> f,
 Function<? super A,? extends C> g)

fail

public static <A,
B> Function<A,B> fail()

restrict

public static <A,
B> Function<A,B> restrict(Function<? super A,? extends B> fun,
 Predicate<? super A> cond)

strict

public static <A,
B> Function<A,B> strict(Function<A,B> fun)

override

public static <A,
B> Function<A,B> override(Function<? super A,? extends B> first,
 Function<? super A,? extends B> second)

defaultTo

public static <A,
B> Function<A,B> defaultTo(B def,
 Function<? super A,? extends B> fun)

domain

public static <A,
B> Predicate<A> domain(Function<? super A,? extends B> fun)

arbitrary

public static <A> Function<Iterable<? extends A>,A> arbitrary()

adjust

public static <A,
B> Function<A,B> adjust(Function<? super A,? extends B> f)

trace

public static <A> Function<A,A> trace(String label)

compose

public static <A,
B,
C,
D> Function<A,D> compose(Function<? super A,? extends B> f1,
 Function<? super B,? extends C> f2,
 Function<? super C,? extends D> f3)

compose

public static <A,
B,
C,
D,
E> Function<A,E> compose(Function<? super A,? extends B> f1,
 Function<? super B,? extends C> f2,
 Function<? super C,? extends D> f3,
 Function<? super D,? extends E> f4)

asSemigroup

public static <A> Semigroup<A> asSemigroup(BiFunction<? super A,? super A,? extends A> f)

inverse

public static <A,
B> SectionableFunction<B,A> inverse(RetractableFunction<A,B> fun)

inverse

public static <A,
B> RetractableFunction<B,A> inverse(SectionableFunction<A,B> fun)

inverse

public static <A,
B> InvertibleFunction<B,A> inverse(InvertibleFunction<A,B> fun)

memoize

public static <A,
B> Function<A,B> memoize(Function<A,B> fun)

memoize

public static <A,
B,
C>
Functions.MemoizedBiFunction<A,B,C> memoize(BiFunction<A,B,C> fun)

liftNull

public static <A,
B> Function<A,B> liftNull(Function<A,B> fun)

Returns a variant of the given function that handles null arguments.

Parameters:

fun - a function

Returns:

a function that computes the same results as fun, but returns null immediately when applied to null.

Throws:

NullPointerException - if fun == null.