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Iterable of the cartesian product of Iterables

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/*
 * Copyright 2019 Information Retrieval Lab - University of A Coruña
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.irlab.cartesianproduct;

import java.util.Iterator;
import java.util.Spliterator;
import java.util.function.Consumer;

import org.jooq.lambda.function.Consumer4;
import org.jooq.lambda.tuple.Tuple4;

/**
 * Iterable of four-arity tuples that also has a forEach with four arguments.
 *
 * @param  the type of the first element
 * @param  the type of the second element
 * @param  the type of the third element
 * @param  the type of the fourth element
 *
 * @author [email protected]
 */
@FunctionalInterface
public interface Iterable4 extends Iterable> {

    /**
     * Performs the give action for each tuple of the {@link Iterable4}.
     *
     * @param action The action to be performed for each tuple.
     */
    default void forEach(final Consumer4 action) {
        forEach(tuple -> action.accept(tuple.v1, tuple.v2, tuple.v3, tuple.v4));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    Iterator> iterator();

    /**
     * {@inheritDoc}
     */
    @Override
    default void forEach(final Consumer> action) {
        Iterable.super.forEach(action);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    default Spliterator> spliterator() {
        return Iterable.super.spliterator();
    }

}