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src/share/classes/com/sun/tools/javac/util/Pair.java@959103a6100f (annotated)

src/share/classes/com/sun/tools/javac/util/Pair.java

Wed, 27 Apr 2016 01:34:52 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:34:52 +0800

changeset 0

959103a6100f

child 2525

2eb010b6cb22

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/langtools/
changeset: 2573:53ca196be1ae
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.tools.javac.util;
aoqi@0	27
aoqi@0	28	import java.util.Objects;
aoqi@0	29
aoqi@0	30	/** A generic class for pairs.
aoqi@0	31	*
aoqi@0	32	* <p><b>This is NOT part of any supported API.
aoqi@0	33	* If you write code that depends on this, you do so at your own risk.
aoqi@0	34	* This code and its internal interfaces are subject to change or
aoqi@0	35	* deletion without notice.</b>
aoqi@0	36	*/
aoqi@0	37	public class Pair<A, B> {
aoqi@0	38
aoqi@0	39	public final A fst;
aoqi@0	40	public final B snd;
aoqi@0	41
aoqi@0	42	public Pair(A fst, B snd) {
aoqi@0	43	this.fst = fst;
aoqi@0	44	this.snd = snd;
aoqi@0	45	}
aoqi@0	46
aoqi@0	47	public String toString() {
aoqi@0	48	return "Pair[" + fst + "," + snd + "]";
aoqi@0	49	}
aoqi@0	50
aoqi@0	51	public boolean equals(Object other) {
aoqi@0	52	return
aoqi@0	53	other instanceof Pair<?,?> &&
aoqi@0	54	Objects.equals(fst, ((Pair<?,?>)other).fst) &&
aoqi@0	55	Objects.equals(snd, ((Pair<?,?>)other).snd);
aoqi@0	56	}
aoqi@0	57
aoqi@0	58	public int hashCode() {
aoqi@0	59	if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1;
aoqi@0	60	else if (snd == null) return fst.hashCode() + 2;
aoqi@0	61	else return fst.hashCode() * 17 + snd.hashCode();
aoqi@0	62	}
aoqi@0	63
aoqi@0	64	public static <A,B> Pair<A,B> of(A a, B b) {
aoqi@0	65	return new Pair<A,B>(a,b);
aoqi@0	66	}
aoqi@0	67	}