Either (Opencast :: common 8.9 API)

```
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 Classes
Modifier and Type	Class and 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.

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and 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.LeftProjection<A,B>`	`left()`
`static <A,B> Either<A,B>`	`left(A left)` Create a left.
`abstract Either.RightProjection<A,B>`	`right()`
`static <A,B> Either<A,B>`	`right(B right)` Create a right.

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

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

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

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

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

Create a left.

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

Create a right.

Class Either<A,B>