net.ninjacat.drama
Class Option<T>

java.lang.Object
  net.ninjacat.drama.Option<T>

Type Parameters:

T - type of the value

public class Option<T>
extends Object

Optional value.

Method Summary

static <T> Option<T>	absent() Creates optional value which is unset
T	get()
boolean	isPresent()
static <T> Option<T>	of(T value) Creates optional value from supplied parameter
T	or(T alternative)
T	orNull()

Methods inherited from class java.lang.Object

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

Method Detail

absent

public static <T> Option<T> absent()

Creates optional value which is unset

Type Parameters:

T - type of the value

Returns:

absent value

of

public static <T> Option<T> of(T value)

Creates optional value from supplied parameter

Type Parameters:

T - type of the value

Parameters:

value - value to wrap into Option. May be null

Returns:

wrapped value

isPresent

public boolean isPresent()

Returns:

true if this optional contains value

or

public T or(T alternative)

Parameters:

alternative - value to be used if this optional is absent

Returns:

value of this option or alternative value if option does not hold anything

orNull

public T orNull()

Returns:

either value of this option or null

get

public T get()

Returns:

value of this option

Throws:

IllegalStateException - if option does not hold anything