68 lines
2.3 KiB
Java
68 lines
2.3 KiB
Java
/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.javac.util;
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import java.util.Objects;
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/** A generic class for pairs.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class Pair<A, B> {
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public final A fst;
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public final B snd;
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public Pair(A fst, B snd) {
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this.fst = fst;
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this.snd = snd;
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}
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public String toString() {
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return "Pair[" + fst + "," + snd + "]";
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}
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public boolean equals(Object other) {
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return
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other instanceof Pair<?,?> &&
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Objects.equals(fst, ((Pair<?,?>)other).fst) &&
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Objects.equals(snd, ((Pair<?,?>)other).snd);
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}
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public int hashCode() {
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if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1;
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else if (snd == null) return fst.hashCode() + 2;
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else return fst.hashCode() * 17 + snd.hashCode();
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}
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public static <A,B> Pair<A,B> of(A a, B b) {
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return new Pair<A,B>(a,b);
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}
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}
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