de.unkrig.commons.lang.protocol

Class Functions

java.lang.Object

de.unkrig.commons.lang.protocol.Functions

public final class Functions
extends java.lang.Object

Various Function- and FunctionWhichThrows-related utility methods.

Method Summary

Modifier and Type	Method and Description
static <I,O,EX extends java.lang.RuntimeException> Function<I,O>	asFunction(FunctionWhichThrows<? super I,? extends O,EX> source) Converts a FunctionWhichThrows into a Function.
static <I,O,EX extends java.lang.Throwable> FunctionWhichThrows<I,O,EX>	asFunctionWhichThrows(Function<? super I,? extends O> source) Converts a Function into a FunctionWhichThrows.
static <O,I extends O> Function<I,O>	identity()

Methods inherited from class java.lang.Object

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

Method Detail

identity

public static <O,I extends O> Function<I,O> identity()

Returns:

A Function that transforms any object reference to itself.

asFunctionWhichThrows

public static <I,O,EX extends java.lang.Throwable> FunctionWhichThrows<I,O,EX> asFunctionWhichThrows(Function<? super I,? extends O> source)

Converts a Function into a FunctionWhichThrows.

That is possible iff:

• The target's input type is a subclass of the source's input type, and
• The source's output type is a subclass of the target's output type.

Type Parameters:

I - The functions' input type

O - The functions' output type

EX - The target function's exception

asFunction

public static <I,O,EX extends java.lang.RuntimeException> Function<I,O> asFunction(FunctionWhichThrows<? super I,? extends O,EX> source)

Converts a FunctionWhichThrows into a Function.

That is possible iff:

• The target's input type is a subclass of the source's input type, and
• The source's output type is a subclass of the target's output type
• The source's exception is a subclass of RuntimeException.

Type Parameters:

I - The functions' input type

O - The functions' output type

EX - The source function's exception