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The first Java Actor System supporting fibers from Project Loom

There is a newer version: 3.0.1

package eu.lucaventuri.functional;

import eu.lucaventuri.common.ConsumerEx;
import eu.lucaventuri.common.Exceptions;

import java.util.Optional;

/** Functional Either, containing or one type or another */
public class Either3 {
    private final L left;
    private final R right;
    private final O other;

    private Either3(L left, R right, O other) {
        this.left = left;
        this.right = right;
        this.other = other;

        assert (left != null && right == null && other == null) ||
                (left == null && right != null && other == null) ||
                (left == null && right == null && other != null);
    }

    public static  Either3 left(L value) {
        Exceptions.assertAndThrow(value != null, "Left value is null!");

        return new Either3(value, null, null);
    }

    public static  Either3 right(R value) {
        Exceptions.assertAndThrow(value != null, "Right value is null!");

        return new Either3(null, value, null);
    }

    public static  Either3 other(O value) {
        Exceptions.assertAndThrow(value != null, "Other value is null!");

        return new Either3(null, null, value);
    }

    public boolean isLeft() {
        return left != null;
    }

    public boolean isRight() {
        return right != null;
    }

    public boolean isOther() {
        return other != null;
    }

    public L left() {
        return left;
    }

    public R right() {
        return right;
    }

    public O other() {
        return other;
    }

    public Optional leftOpt() {
        return Optional.ofNullable(left);
    }

    public Optional rightOpt() {
        return Optional.ofNullable(right);
    }

    public Optional otherOpt() {
        return Optional.ofNullable(other);
    }

    public  void ifLeft(ConsumerEx consumer) throws E {
        if (left != null)
            consumer.accept(left);
    }

    public  void ifRight(ConsumerEx consumer) throws E {
        if (right != null)
            consumer.accept(right);
    }

    public  void ifOther(ConsumerEx consumer) throws E {
        if (right != null)
            consumer.accept(other);
    }

    public  void ifEither(ConsumerEx consumerLeft, ConsumerEx consumerRight, ConsumerEx consumerOther) throws E {
        if (left != null)
            consumerLeft.accept(left);
        else if (right!=null)
            consumerRight.accept(right);
        else
            consumerOther.accept(other);
    }
}