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 Windows
33: */
34: public class FileKey {
35:
36: private long dwVolumeSerialNumber;
37: private long nFileIndexHigh;
38: private long nFileIndexLow;
39:
40: private FileKey() {
41: }
42:
43: public static FileKey create(FileDescriptor fd) {
44: FileKey fk = new FileKey();
45: try {
46: fk.init(fd);
47: } catch (IOException ioe) {
48: throw new Error(ioe);
49: }
50: return fk;
51: }
52:
53: public int hashCode() {
54: return (int) (dwVolumeSerialNumber ^ (dwVolumeSerialNumber >>> 32))
55: + (int) (nFileIndexHigh ^ (nFileIndexHigh >>> 32))
56: + (int) (nFileIndexLow ^ (nFileIndexHigh >>> 32));
57: }
58:
59: public boolean equals(Object obj) {
60: if (obj == this )
61: return true;
62: if (!(obj instanceof FileKey))
63: return false;
64: FileKey other = (FileKey) obj;
65: if ((this .dwVolumeSerialNumber != other.dwVolumeSerialNumber)
66: || (this .nFileIndexHigh != other.nFileIndexHigh)
67: || (this .nFileIndexLow != other.nFileIndexLow)) {
68: return false;
69: }
70: return true;
71: }
72:
73: private native void init(FileDescriptor fd) throws IOException;
74:
75: private static native void initIDs();
76:
77: static {
78: initIDs();
79: }
80: }
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