org.organicdesign.fp.function

Interface Function0<U>

All Superinterfaces:

Callable<U>, Supplier<U>

All Known Implementing Classes:

Function0.Const, Function0.Constant

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Function0<U>
extends Supplier<U>, Callable<U>

This is like Java 8's java.util.function.Supplier, but retrofitted to turn checked exceptions into unchecked ones. It's also called a thunk when used to delay evaluation.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Function0.Const
static class	Function0.Constant<K> Wraps a value in a constant function.

Field Summary

Fields

Modifier and Type	Field and Description
static Function0<Object>	NULL Deprecated.

Method Summary

Modifier and Type	Method and Description
default U	apply() The class that takes a consumer as an argument uses this convenience method so that it doesn't have to worry about checked exceptions either.
U	applyEx() Implement this one method and you don't have to worry about checked exceptions.
default U	call()
static <K> Function0<K>	constantFunction(K k)
default U	get()

Field Detail

NULL

@Deprecated
static final Function0<Object> NULL

Deprecated.

Use Function0.Const.NULL instead because it's serializable.

Method Detail

applyEx

U applyEx()
   throws Exception

Implement this one method and you don't have to worry about checked exceptions.

Throws:

Exception

apply

default U apply()

The class that takes a consumer as an argument uses this convenience method so that it doesn't have to worry about checked exceptions either.

get

default U get()

Specified by:

get in interface Supplier<U>

call

default U call()
        throws Exception

Specified by:

call in interface Callable<U>

Throws:

Exception

constantFunction

static <K> Function0<K> constantFunction(K k)