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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, 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 java.util.Optional;


import org.jooq.lambda.function.Function1;

/**
 * A tuple of degree 1.
 *
 * @author Lukas Eder
 */
public class Tuple1 implements Tuple, Comparable>, Serializable, Cloneable {
    
    public final T1 v1;
    
    public T1 v1() {
        return v1;
    }
    
    public Tuple1(Tuple1 tuple) {
        this.v1 = tuple.v1;
    }

    public Tuple1(T1 v1) {
        this.v1 = v1;
    }
    
    /**
     * Apply this tuple as arguments to a function.
     */
    public final  R map(Function1 function) {
        return function.apply(this);
    }
    
    /**
     * Apply attribute 1 as argument to a function and return a new tuple with the substituted argument.
     */
    public final  Tuple1 map1(Function1 function) {
        return Tuple.tuple(function.apply(v1));
    }
    
    @Override
    public final Object[] array() {
        return new Object[] { v1 };
    }

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

    /**
     * The degree of this tuple: 1.
     */
    @Override
    public final int degree() {
        return 1;
    }

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