Wed, 25 Mar 2009 10:29:28 +0000
6400189: raw types and inference
Summary: Fixed resolution problem with raw overriding (CCC)
Reviewed-by: jjg
1 /*
2 * Copyright 1999-2005 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javac.util;
28 /** A generic class for pairs.
29 *
30 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
31 * you write code that depends on this, you do so at your own risk.
32 * This code and its internal interfaces are subject to change or
33 * deletion without notice.</b>
34 */
35 public class Pair<A, B> {
37 public final A fst;
38 public final B snd;
40 public Pair(A fst, B snd) {
41 this.fst = fst;
42 this.snd = snd;
43 }
45 public String toString() {
46 return "Pair[" + fst + "," + snd + "]";
47 }
49 private static boolean equals(Object x, Object y) {
50 return (x == null && y == null) || (x != null && x.equals(y));
51 }
53 public boolean equals(Object other) {
54 return
55 other instanceof Pair<?,?> &&
56 equals(fst, ((Pair<?,?>)other).fst) &&
57 equals(snd, ((Pair<?,?>)other).snd);
58 }
60 public int hashCode() {
61 if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1;
62 else if (snd == null) return fst.hashCode() + 2;
63 else return fst.hashCode() * 17 + snd.hashCode();
64 }
66 public static <A,B> Pair<A,B> of(A a, B b) {
67 return new Pair<A,B>(a,b);
68 }
69 }