Package org.opencastproject.util.data

Class Either<A,B>

java.lang.Object

org.opencastproject.util.data.Either<A,B>

public abstract class Either<A,B>
extends Object

An algebraic data type representing a disjoint union. By convention left is considered to represent an error while right represents a value. This implementation of Either is much simpler than implementations you may know from other languages or libraries.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	Either.LeftProjection<A,B>	Left projection of either.
static interface	Either.Match<A,B,X>
class	Either.RightProjection<A,B>	Right projection of either.

Method Summary

Modifier and Type	Method	Description
abstract <X> X	fold(Either.Match<A,B,X> visitor)
abstract <X> X	fold(Function<? super A,? extends X> left, Function<? super B,? extends X> right)
abstract boolean	isLeft()
abstract boolean	isRight()
abstract Either<A,B>.LeftProjection<A,B>	left()
static <A, B> Either<A,B>	left(A left)	Create a left.
abstract Either<A,B>.RightProjection<A,B>	right()
static <A, B> Either<A,B>	right(B right)	Create a right.

Methods inherited from class java.lang.Object

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

Method Details

left

public abstract Either<A,B>.LeftProjection<A,B> left()

right

public abstract Either<A,B>.RightProjection<A,B> right()

fold

public abstract <X> X fold(Either.Match<A,B,X> visitor)

fold

public abstract <X> X fold(Function<? super A,? extends X> left,
 Function<? super B,? extends X> right)

isLeft

public abstract boolean isLeft()

isRight

public abstract boolean isRight()

left

public static <A,
B> Either<A,B> left(A left)

Create a left.

right

public static <A,
B> Either<A,B> right(B right)

Create a right.