1 /* 2 * Copyright (c) 2005, 2013, 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 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 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)(dwVolumeSerialNumber ^ (dwVolumeSerialNumber >>> 32)) + 54 (int)(nFileIndexHigh ^ (nFileIndexHigh >>> 32)) + 55 (int)(nFileIndexLow ^ (nFileIndexHigh >>> 32)); 56 } 57 58 public boolean equals(Object obj) { 59 if (obj == this) 60 return true; 61 if (!(obj instanceof FileKey)) 62 return false; 63 FileKey other = (FileKey)obj; 64 if ((this.dwVolumeSerialNumber != other.dwVolumeSerialNumber) || 65 (this.nFileIndexHigh != other.nFileIndexHigh) || 66 (this.nFileIndexLow != other.nFileIndexLow)) { 67 return false; 68 } 69 return true; 70 } 71 72 private native void init(FileDescriptor fd) throws IOException; 73 private static native void initIDs(); 74 75 static { 76 IOUtil.load(); 77 initIDs(); 78 } 79 }