Pair.java

/*
 * Copyright LGPL3
 * YES Technology Association
 * http://yestech.org
 *
 * http://www.opensource.org/licenses/lgpl-3.0.html
 */

/*
 *
 * Author:  Artie Copeland
 * Last Modified Date: $DateTime: $
 */
package org.yestech.lib.util;

/**
 * Represents a tuple of 2
 *
 * @author Artie Copeland
 * @version $Revision: $
 */
public class Pair<T1, T2> implements ITuple {
    private T1 first;
    private T2 second;
    private static final long serialVersionUID = 5366420016223666321L;

    public Pair() {
    }

    public Pair(T1 first, T2 second) {
        this.first = first;
        this.second = second;
    }

    public T1 getFirst() {
        return first;
    }

    public void setFirst(T1 first) {
        this.first = first;
    }

    public T2 getSecond() {
        return second;
    }

    public void setSecond(T2 second) {
        this.second = second;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Pair)) return false;

        Pair pair = (Pair) o;

        if (first != null ? !first.equals(pair.first) : pair.first != null) return false;
        if (second != null ? !second.equals(pair.second) : pair.second != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = first != null ? first.hashCode() : 0;
        result = 31 * result + (second != null ? second.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return "Pair{" +
                "first=" + first +
                ", second=" + second +
                '}';
    }

    public static <F, S> Pair<F, S> create(F first, S second) {
        return new Pair<F, S>(first, second);
    }
}