Package org.opencastproject.util.data.functions

Class Options

java.lang.Object

org.opencastproject.util.data.functions.Options

public final class Options
extends Object

Option related functions.

Method Summary

Modifier and Type	Method	Description
static <A> Function<Option<A>,List<A>>	asList()
static <A, B> Function<A,Option<B>>	foreach(Function<? super A,? extends Option<? extends B>> f, Effect<? super B> e)	Apply effect e to the result of f which is then returned.
static <A> Option<A>	join(Option<Option<A>> a)	m (m a) -> m a
static <A> Option<List<A>>	sequenceOpt(List<Option<A>> as)	Sequence a list of options.
static Option<String>	toOption(boolean predicate, String message)	Returns some(message) if predicate is false, none otherwise.

Methods inherited from class java.lang.Object

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

Method Details

join

public static <A> Option<A> join(Option<Option<A>> a)

m (m a) -> m a

asList

public static <A> Function<Option<A>,List<A>> asList()

toOption

public static Option<String> toOption(boolean predicate,
 String message)

Returns some(message) if predicate is false, none otherwise.

sequenceOpt

public static <A> Option<List<A>> sequenceOpt(List<Option<A>> as)

Sequence a list of options. [Option a] -> Option [a]

foreach

public static <A,
B> Function<A,Option<B>> foreach(Function<? super A,? extends Option<? extends B>> f,
 Effect<? super B> e)

Apply effect e to the result of f which is then returned.