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