author | briangoetz |
Wed, 18 Dec 2013 16:05:18 -0500 | |
changeset 22163 | 3651128c74eb |
parent 16795 | 04f5c8373776 |
permissions | -rw-r--r-- |
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/* |
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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); |
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} |
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} |