endrov.util.collection
Class Maybe<E>

java.lang.Object
  endrov.util.collection.Maybe<E>

public class Maybe<E>
extends java.lang.Object

Wrapper around pointer that can be a value and can be null, but need to know in addition if it is set. Corresponds to the Haskell Maybe monad.

Constructor Summary

Maybe()
Construct a Nothing-value

Maybe(E e)
Construct a reference to a value

Method Summary

E	get() Get the value
boolean	hasValue() Is there a value?
static <E> Maybe<E>	just(E e) Construct value.
java.lang.String	toString() String of value of <> if there is no value

Methods inherited from class java.lang.Object

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

Constructor Detail

Maybe

public Maybe()

Construct a Nothing-value

Maybe

public Maybe(E e)

Construct a reference to a value

Method Detail

get

public E get()

Get the value

hasValue

public boolean hasValue()

Is there a value?

just

public static <E> Maybe<E> just(E e)

Construct value. Nicer to use than constructor since it infers type

toString

public java.lang.String toString()

String of value of <> if there is no value

Overrides:

toString in class java.lang.Object