org.decisiondeck.jmcda.utils
Class FunctionUtils

java.lang.Object
  org.decisiondeck.jmcda.utils.FunctionUtils

public class FunctionUtils
extends Object

Constructor Summary

FunctionUtils()

Method Summary

static <A,B,C> FunctionWithInputCheck<A,C>	compose(Function<B,? extends C> g, FunctionWithInputCheck<A,? extends B> f)
static <A,B,C> FunctionWithInputCheck<A,C>	compose(FunctionWithInputCheck<B,? extends C> g, Function<A,? extends B> f)
static <A,B,C> FunctionWithInputCheck<A,C>	compose(FunctionWithInputCheck<B,? extends C> g, FunctionWithInputCheck<A,? extends B> f)
static <F,V> FunctionWithInputCheck<F,V>	constant(V value)
static <F,F2 extends F,V2,V extends V2> FunctionWithInputCheck<F2,V2>	functionWithInputCheck(Function<F,V> f) Transforms a function into a function with input check.
static <E> FunctionWithInputCheck<E,E>	identity()

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionUtils

public FunctionUtils()

Method Detail

compose

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

compose

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

compose

public static <A,B,C> FunctionWithInputCheck<A,C> compose(FunctionWithInputCheck<B,? extends C> g,
                                                          FunctionWithInputCheck<A,? extends B> f)

functionWithInputCheck

public static <F,F2 extends F,V2,V extends V2> FunctionWithInputCheck<F2,V2> functionWithInputCheck(Function<F,V> f)

Transforms a function into a function with input check. This is mainly intended as a technical method to provide type compatibility where a function with input check is expected instead of a function. The returned function does not throw InvalidInputExceptions.

Type Parameters:

F - the domain of the given function: the type of value it expects.

V - the codomain of the given function: the type of value it returns.

F2 - the domain of the returned function: the type of value it expects.

V2 - the codomain of the returned function: the type of value it returns.

Parameters:

f - not null.

Returns:

not null.

constant

public static <F,V> FunctionWithInputCheck<F,V> constant(V value)

identity

public static <E> FunctionWithInputCheck<E,E> identity()

Type Parameters:

E - the input and output type of the function.

Returns:

the identity function.