1/*
2 * Copyright (c) 2008, 2009, 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 */
25
26package sun.nio.fs;
27
28/**
29 * Container for device/inode to uniquely identify file.
30 */
31
32class UnixFileKey {
33    private final long st_dev;
34    private final long st_ino;
35
36    UnixFileKey(long st_dev, long st_ino) {
37        this.st_dev = st_dev;
38        this.st_ino = st_ino;
39    }
40
41    @Override
42    public int hashCode() {
43        return (int)(st_dev ^ (st_dev >>> 32)) +
44               (int)(st_ino ^ (st_ino >>> 32));
45    }
46
47    @Override
48    public boolean equals(Object obj) {
49        if (obj == this)
50            return true;
51        if (!(obj instanceof UnixFileKey))
52            return false;
53        UnixFileKey other = (UnixFileKey)obj;
54        return (this.st_dev == other.st_dev) && (this.st_ino == other.st_ino);
55    }
56
57    @Override
58    public String toString() {
59        StringBuilder sb = new StringBuilder();
60        sb.append("(dev=")
61          .append(Long.toHexString(st_dev))
62          .append(",ino=")
63          .append(st_ino)
64          .append(')');
65        return sb.toString();
66    }
67}
68