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jOOλ is part of the jOOQ series (along with jOOQ, jOOX, jOOR, jOOU) providing some useful extensions to Java 8 lambdas.
There is a newer version: 0.9.15
/**
 * Copyright (c) 2014-2015, Data Geekery GmbH, [email protected]
 *
 * 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.jooq.lambda.tuple;

import java.io.Serializable;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;

import org.jooq.lambda.function.Function1;
import org.jooq.lambda.function.Function3;

/**
 * A tuple of degree 3.
 *
 * @author Lukas Eder
 */
public class Tuple3 implements Tuple, Comparable>, Serializable, Cloneable {

    private static final long serialVersionUID = 1L;

    public final T1 v1;
    public final T2 v2;
    public final T3 v3;

    public T1 v1() {
        return v1;
    }

    public T2 v2() {
        return v2;
    }

    public T3 v3() {
        return v3;
    }

    public Tuple3(Tuple3 tuple) {
        this.v1 = tuple.v1;
        this.v2 = tuple.v2;
        this.v3 = tuple.v3;
    }

    public Tuple3(T1 v1, T2 v2, T3 v3) {
        this.v1 = v1;
        this.v2 = v2;
        this.v3 = v3;
    }

    /**
     * Concatenate a value to this tuple.
     */
    public final  Tuple4 concat(T4 value) {
        return new Tuple4<>(v1, v2, v3, value);
    }

    /**
     * Concatenate a tuple to this tuple.
     */
    public final  Tuple4 concat(Tuple1 tuple) {
        return new Tuple4<>(v1, v2, v3, tuple.v1);
    }

    /**
     * Concatenate a tuple to this tuple.
     */
    public final  Tuple5 concat(Tuple2 tuple) {
        return new Tuple5<>(v1, v2, v3, tuple.v1, tuple.v2);
    }

    /**
     * Concatenate a tuple to this tuple.
     */
    public final  Tuple6 concat(Tuple3 tuple) {
        return new Tuple6<>(v1, v2, v3, tuple.v1, tuple.v2, tuple.v3);
    }

    /**
     * Concatenate a tuple to this tuple.
     */
    public final  Tuple7 concat(Tuple4 tuple) {
        return new Tuple7<>(v1, v2, v3, tuple.v1, tuple.v2, tuple.v3, tuple.v4);
    }

    /**
     * Concatenate a tuple to this tuple.
     */
    public final  Tuple8 concat(Tuple5 tuple) {
        return new Tuple8<>(v1, v2, v3, tuple.v1, tuple.v2, tuple.v3, tuple.v4, tuple.v5);
    }

    /**
     * Apply this tuple as arguments to a function.
     */
    public final  R map(Function3 function) {
        return function.apply(this);
    }

    /**
     * Apply attribute 1 as argument to a function and return a new tuple with the substituted argument.
     */
    public final  Tuple3 map1(Function1 function) {
        return Tuple.tuple(function.apply(v1), v2, v3);
    }

    /**
     * Apply attribute 2 as argument to a function and return a new tuple with the substituted argument.
     */
    public final  Tuple3 map2(Function1 function) {
        return Tuple.tuple(v1, function.apply(v2), v3);
    }

    /**
     * Apply attribute 3 as argument to a function and return a new tuple with the substituted argument.
     */
    public final  Tuple3 map3(Function1 function) {
        return Tuple.tuple(v1, v2, function.apply(v3));
    }

    @Override
    public final Object[] array() {
        return new Object[] { v1, v2, v3 };
    }

    @Override
    public final List list() {
        return Arrays.asList(array());
    }

    /**
     * The degree of this tuple: 3.
     */
    @Override
    public final int degree() {
        return 3;
    }

    @Override
    @SuppressWarnings("unchecked")
    public final Iterator