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TypeAlias, Result and Maybe for Java
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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2021 Paul Campbell
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies
 * or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package net.kemitix.mon.experimental.either;

import lombok.RequiredArgsConstructor;

import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Function;

/**
 * An Either type holding a right value.
 *
 * @param  the type of the Either for left value
 * @param  the type of the Either for right value
 * @author Paul Campbell ([email protected])
 */
@RequiredArgsConstructor
class Right implements Either {

    private final R value;

    @Override
    public boolean isLeft() {
        return false;
    }

    @Override
    public boolean isRight() {
        return true;
    }

    @Override
    public void match(final Consumer onLeft, final Consumer onRight) {
        onRight.accept(value);
    }

    @Override
    public  Either mapLeft(final Function f) {
        return new Right<>(value);
    }

    @Override
    public  Either mapRight(final Function f) {
        return new Right<>(f.apply(value));
    }

    @Override
    @SuppressWarnings("unchecked")
    public  Either flatMapLeft(final Function> f) {
        return (Either) this;
    }

    @Override
    public  Either flatMapRight(final Function> f) {
        return f.apply(value);
    }

    @Override
    public Optional getLeft() {
        return Optional.empty();
    }

    @Override
    public Optional getRight() {
        return Optional.ofNullable(value);
    }

}