1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.utils.datastructures;
15 * A generic Quad (4-tuple) structure for containing four object instances of
18 * @param <T1> type of first element
19 * @param <T2> type of second element
20 * @param <T3> type of third element
21 * @param <T4> type of fourth element
23 public final class Quad<T1, T2, T3, T4> {
24 public final T1 first;
25 public final T2 second;
26 public final T3 third;
27 public final T4 fourth;
28 private final int hash;
30 public static <T1, T2, T3, T4> Quad<T1, T2, T3, T4> make(T1 t1, T2 t2, T3 t3, T4 t4) {
31 return new Quad<T1, T2, T3, T4>(t1, t2, t3, t4);
34 public Quad(T1 first, T2 second, T3 third, T4 fourth) {
39 this.hash = makeHash();
43 public boolean equals(Object obj) {
46 if (!(obj.getClass().equals(this.getClass())))
48 Quad<?, ?, ?, ?> other = (Quad<?, ?, ?, ?>) obj;
49 if (other.first != first && (other.first == null || !other.first.equals(first)))
51 if (other.second != second && (other.second == null || !other.second.equals(second)))
53 if (other.third != third && (other.third == null || !other.third.equals(third)))
55 if (other.fourth != fourth && (other.fourth == null || !other.fourth.equals(fourth)))
61 public int hashCode() {
66 public String toString() {
67 return "<"+first+", "+second+", "+third+", "+fourth+">";
70 private int makeHash() {
71 return (first == null ? 0 : first.hashCode()) + (second == null ? 0 : second.hashCode())*31 + (third == null ? 0 : third.hashCode())*41+ (fourth == null ? 0 : fourth.hashCode())*71;