1/*
2 * Copyright (c) 2005, 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.ch;
27
28import java.io.FileDescriptor;
29import java.io.IOException;
30
31/*
32 * Represents a key to a specific file on Solaris or Linux
33 */
34public class FileKey {
35
36    private long st_dev;    // ID of device
37    private long st_ino;    // Inode number
38
39    private FileKey() { }
40
41    public static FileKey create(FileDescriptor fd) {
42        FileKey fk = new FileKey();
43        try {
44            fk.init(fd);
45        } catch (IOException ioe) {
46            throw new Error(ioe);
47        }
48        return fk;
49    }
50
51    public int hashCode() {
52        return (int)(st_dev ^ (st_dev >>> 32)) +
53               (int)(st_ino ^ (st_ino >>> 32));
54    }
55
56    public boolean equals(Object obj) {
57        if (obj == this)
58            return true;
59        if (!(obj instanceof FileKey))
60            return false;
61        FileKey other = (FileKey)obj;
62        if ((this.st_dev != other.st_dev) ||
63            (this.st_ino != other.st_ino)) {
64            return false;
65        }
66        return true;
67    }
68
69    private native void init(FileDescriptor fd) throws IOException;
70}
71