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提供常用工具
There is a newer version: 1.6.1
package cn.maarlakes.common.tuple;

import jakarta.annotation.Nonnull;

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

/**
 * @author linjpxc
 */
public class Tuple4 implements Tuple {
    private static final long serialVersionUID = -7658846032238811696L;

    protected final T1 item1;
    protected final T2 item2;
    protected final T3 item3;
    protected final T4 item4;

    public Tuple4(T1 item1, T2 item2, T3 item3, T4 item4) {
        this.item1 = item1;
        this.item2 = item2;
        this.item3 = item3;
        this.item4 = item4;
    }

    public final T1 item1() {
        return this.item1;
    }

    public final T2 item2() {
        return this.item2;
    }

    public final T3 item3() {
        return this.item3;
    }

    public final T4 item4() {
        return this.item4;
    }

    public final Optional optionalItem1() {
        return Optional.ofNullable(this.item1);
    }

    public final Optional optionalItem2() {
        return Optional.ofNullable(this.item2);
    }

    public final Optional optionalItem3() {
        return Optional.ofNullable(this.item3);
    }

    public final Optional optionalItem4() {
        return Optional.ofNullable(this.item4);
    }

    @Override
    public final int size() {
        return 4;
    }

    @Override
    @SuppressWarnings("unchecked")
    public  T get(int index) {
        switch (index) {
            case 0:
                return (T) this.item1;
            case 1:
                return (T) this.item2;
            case 2:
                return (T) this.item3;
            case 3:
                return (T) this.item4;
            default:
                throw new IndexOutOfBoundsException();
        }
    }

    public Tuple4 with(T1 item1, T2 item2, T3 item3, T4 item4) {
        return new Tuple4<>(item1, item2, item3, item4);
    }

    public Tuple4 withItem1(T1 item1) {
        return new Tuple4<>(item1, this.item2, this.item3, this.item4);
    }

    public Tuple4 withItem2(T2 item2) {
        return new Tuple4<>(this.item1, item2, this.item3, this.item4);
    }

    public Tuple4 withItem3(T3 item3) {
        return new Tuple4<>(this.item1, this.item2, item3, this.item4);
    }

    public Tuple4 withItem4(T4 item4) {
        return new Tuple4<>(this.item1, this.item2, this.item3, item4);
    }

    public  Tuple4 map(Function map1, Function map2, Function map3, Function map4) {
        return new Tuple4<>(map1.apply(this.item1), map2.apply(this.item2), map3.apply(this.item3), map4.apply(this.item4));
    }

    public  Tuple4 mapItem1(Function map1) {
        return new Tuple4<>(map1.apply(this.item1), this.item2, this.item3, this.item4);
    }

    public  Tuple4 mapItem2(Function map2) {
        return new Tuple4<>(this.item1, map2.apply(this.item2), this.item3, this.item4);
    }

    public  Tuple4 mapItem3(Function map3) {
        return new Tuple4<>(this.item1, this.item2, map3.apply(this.item3), this.item4);
    }

    public  Tuple4 mapItem4(Function map4) {
        return new Tuple4<>(this.item1, this.item2, this.item3, map4.apply(this.item4));
    }

    @Nonnull
    @Override
    @SuppressWarnings("unchecked")
    public Tuple4 clone() {
        try {
            return (Tuple4) super.clone();
        } catch (CloneNotSupportedException e) {
            throw new IllegalStateException(e);
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final Tuple4 tuple4 = (Tuple4) o;
        return Objects.equals(item1, tuple4.item1) && Objects.equals(item2, tuple4.item2) && Objects.equals(item3, tuple4.item3) && Objects.equals(item4, tuple4.item4);
    }

    @Override
    public int hashCode() {
        return Objects.hash(item1, item2, item3, item4);
    }

    @Override
    public String toString() {
        return "{" + this.item1 + ", " + this.item2 + ", " + this.item3 + ", " + this.item4 + "}";
    }
}