Tuple.java

Go to the documentation of this file.

/* *********************************************************************** *
 * project: org.matsim.*
 * Tuple.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2007 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */

package org.matsim.core.utils.collections;

import java.io.Serializable;

public final class Tuple<A, B> implements Serializable {
    private static final long serialVersionUID = 1L;

    public static <A, B> Tuple<A, B> of(final A first, final B second) {
        return new Tuple<>(first, second);
    }

    private final A first;
    private final B second;
    public Tuple(final A first, final B second) {
        this.first = first;
        this.second = second;
    }

    public A getFirst() {
        return this.first;
    }

    public B getSecond() {
        return this.second;
    }

    @Override
    public boolean equals(final Object other) {
        if (!(other instanceof Tuple)) return false;
        Tuple o = (Tuple) other;
        if (this.first != null && this.second != null && o.first != null && o.second != null) {
            return (this.first.equals(o.first) && this.second.equals(o.second));
        }
        boolean firstEquals = (this.first == null) && (o.first == null);
        boolean secondEquals = (this.second == null) && (o.second == null);
        if (!firstEquals && this.first != null && o.first != null) {
            firstEquals = this.first.equals(o.first);
        }
        if (!secondEquals && this.second != null && o.second != null) {
            secondEquals = this.second.equals(o.second);
        }
        return firstEquals && secondEquals;
    }

    @Override
    public int hashCode() {
        return (this.first == null ? 0 : this.first.hashCode()) +
                (this.second == null ? 0 : this.second.hashCode());
    }

    @Override
    public String toString() {
        StringBuilder buffer = new StringBuilder(50);
        buffer.append("[Tuple: [First: " );
        buffer.append(this.first.toString());
        buffer.append("], [Second: ");
        buffer.append(this.second.toString());
        buffer.append("]]");
        return buffer.toString();
    }

}