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Signal Protocol cryptography library for Java

There is a newer version: 2.8.1

/**
 * Copyright (C) 2014-2016 Open Whisper Systems
 *
 * Licensed according to the LICENSE file in this repository.
 */
package org.whispersystems.libsignal.util;

public class Pair {
  private final T1 v1;
  private final T2 v2;

  public Pair(T1 v1, T2 v2) {
    this.v1 = v1;
    this.v2 = v2;
  }

  public T1 first(){
    return v1;
  }

  public T2 second(){
    return v2;
  }

  public boolean equals(Object o) {
    return o instanceof Pair &&
        equal(((Pair) o).first(), first()) &&
        equal(((Pair) o).second(), second());
  }

  public int hashCode() {
    return first().hashCode() ^ second().hashCode();
  }

  private boolean equal(Object first, Object second) {
    if (first == null && second == null) return true;
    if (first == null || second == null) return false;
    return first.equals(second);
  }
}