01: /*
02: * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * 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: */
25:
26: package sun.nio.ch;
27:
28: import java.io.FileDescriptor;
29: import java.io.IOException;
30:
31: /*
32: * Represents a key to a specific file on Solaris or Linux
33: */
34: public class FileKey {
35:
36: private long st_dev; // ID of device
37: private long st_ino; // Inode number
38:
39: private FileKey() {
40: }
41:
42: public static FileKey create(FileDescriptor fd) {
43: FileKey fk = new FileKey();
44: try {
45: fk.init(fd);
46: } catch (IOException ioe) {
47: throw new Error(ioe);
48: }
49: return fk;
50: }
51:
52: public int hashCode() {
53: return (int) (st_dev ^ (st_dev >>> 32))
54: + (int) (st_ino ^ (st_ino >>> 32));
55: }
56:
57: public boolean equals(Object obj) {
58: if (obj == this )
59: return true;
60: if (!(obj instanceof FileKey))
61: return false;
62: FileKey other = (FileKey) obj;
63: if ((this .st_dev != other.st_dev)
64: || (this .st_ino != other.st_ino)) {
65: return false;
66: }
67: return true;
68: }
69:
70: private native void init(FileDescriptor fd) throws IOException;
71:
72: private static native void initIDs();
73:
74: static {
75: initIDs();
76: }
77: }
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