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