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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16 * A generic Pair (2-tuple) structure for containing two object instances of
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19 * @param <T1> type of first element
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20 * @param <T2> type of second element
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22 public final class FirstIdentityPair<T1, T2> implements Comparable<FirstIdentityPair<T1, T2>> {
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23 public final T1 first;
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24 public final T2 second;
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25 private final int hash;
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27 public static <T1, T2> FirstIdentityPair<T1, T2> make(T1 t1, T2 t2) {
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28 return new FirstIdentityPair<T1, T2>(t1, t2);
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31 public FirstIdentityPair(T1 first, T2 second) {
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32 //assert(first != null);
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33 //assert(second != null);
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36 this.second = second;
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37 this.hash = makeHash();
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41 public boolean equals(Object obj) {
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44 if (!(obj.getClass().equals(this.getClass())))
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46 FirstIdentityPair<?, ?> other = (FirstIdentityPair<?, ?>) obj;
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47 if (other.first != first && (other.first == null || !other.first.equals(first)))
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53 public int hashCode() {
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58 public String toString() {
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59 return "<"+first+", "+second+">";
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62 private int makeHash() {
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63 return (first == null ? 0 : first.hashCode());
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67 public int compareTo(FirstIdentityPair<T1, T2> arg0) {
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68 return hash - arg0.hash;
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