jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/Pair.java@959103a6100f

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

     1 /*

     2  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package com.sun.tools.javac.util;

    28 import java.util.Objects;

    30 /** A generic class for pairs.

    31  *

    32  *  <p><b>This is NOT part of any supported API.

    33  *  If you write code that depends on this, you do so at your own risk.

    34  *  This code and its internal interfaces are subject to change or

    35  *  deletion without notice.</b>

    36  */

    37 public class Pair<A, B> {

    39     public final A fst;

    40     public final B snd;

    42     public Pair(A fst, B snd) {

    43         this.fst = fst;

    44         this.snd = snd;

    45     }

    47     public String toString() {

    48         return "Pair[" + fst + "," + snd + "]";

    49     }

    51     public boolean equals(Object other) {

    52         return

    53             other instanceof Pair<?,?> &&

    54             Objects.equals(fst, ((Pair<?,?>)other).fst) &&

    55             Objects.equals(snd, ((Pair<?,?>)other).snd);

    56     }

    58     public int hashCode() {

    59         if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1;

    60         else if (snd == null) return fst.hashCode() + 2;

    61         else return fst.hashCode() * 17 + snd.hashCode();

    62     }

    64     public static <A,B> Pair<A,B> of(A a, B b) {

    65         return new Pair<A,B>(a,b);

    66     }

    67 }

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