Mercurial > jdk8-mips64-public > langtools / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/share/classes/com/sun/tools/javac/util/Pair.java	Sat Dec 01 00:00:00 2007 +0000
     1.3 @@ -0,0 +1,69 @@
     1.4 +/*
     1.5 + * Copyright 1999-2005 Sun Microsystems, Inc.  All Rights Reserved.
     1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     1.7 + *
     1.8 + * This code is free software; you can redistribute it and/or modify it
     1.9 + * under the terms of the GNU General Public License version 2 only, as
    1.10 + * published by the Free Software Foundation.  Sun designates this
    1.11 + * particular file as subject to the "Classpath" exception as provided
    1.12 + * by Sun in the LICENSE file that accompanied this code.
    1.13 + *
    1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
    1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    1.16 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    1.17 + * version 2 for more details (a copy is included in the LICENSE file that
    1.18 + * accompanied this code).
    1.19 + *
    1.20 + * You should have received a copy of the GNU General Public License version
    1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
    1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    1.23 + *
    1.24 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
    1.25 + * CA 95054 USA or visit www.sun.com if you need additional information or
    1.26 + * have any questions.
    1.27 + */
    1.28 +
    1.29 +package com.sun.tools.javac.util;
    1.30 +
    1.31 +/** A generic class for pairs.
    1.32 + *
    1.33 + *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
    1.34 + *  you write code that depends on this, you do so at your own risk.
    1.35 + *  This code and its internal interfaces are subject to change or
    1.36 + *  deletion without notice.</b>
    1.37 + */
    1.38 +public class Pair<A, B> {
    1.39 +
    1.40 +    public final A fst;
    1.41 +    public final B snd;
    1.42 +
    1.43 +    public Pair(A fst, B snd) {
    1.44 +        this.fst = fst;
    1.45 +        this.snd = snd;
    1.46 +    }
    1.47 +
    1.48 +    public String toString() {
    1.49 +        return "Pair[" + fst + "," + snd + "]";
    1.50 +    }
    1.51 +
    1.52 +    private static boolean equals(Object x, Object y) {
    1.53 +        return (x == null && y == null) || (x != null && x.equals(y));
    1.54 +    }
    1.55 +
    1.56 +    public boolean equals(Object other) {
    1.57 +        return
    1.58 +            other instanceof Pair &&
    1.59 +            equals(fst, ((Pair)other).fst) &&
    1.60 +            equals(snd, ((Pair)other).snd);
    1.61 +    }
    1.62 +
    1.63 +    public int hashCode() {
    1.64 +        if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1;
    1.65 +        else if (snd == null) return fst.hashCode() + 2;
    1.66 +        else return fst.hashCode() * 17 + snd.hashCode();
    1.67 +    }
    1.68 +
    1.69 +    public static <A,B> Pair<A,B> of(A a, B b) {
    1.70 +        return new Pair<A,B>(a,b);
    1.71 +    }
    1.72 +}