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FileKey.java
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FileKey.java
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/*
* Copyright (c) 2005, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.FileDescriptor;
import java.io.IOException;
/*
* Represents a key to a specific file on Windows
*/
public class FileKey {
private long dwVolumeSerialNumber;
private long nFileIndexHigh;
private long nFileIndexLow;
private FileKey() { }
public static FileKey create(FileDescriptor fd) throws IOException {
FileKey fk = new FileKey();
fk.init(fd);
return fk;
}
@Override
public int hashCode() {
return (int)(dwVolumeSerialNumber ^ (dwVolumeSerialNumber >>> 32)) +
(int)(nFileIndexHigh ^ (nFileIndexHigh >>> 32)) +
(int)(nFileIndexLow ^ (nFileIndexLow >>> 32));
}
@Override
public boolean equals(Object obj) {
if (obj == this)
return true;
return obj instanceof FileKey other
&& this.dwVolumeSerialNumber == other.dwVolumeSerialNumber
&& this.nFileIndexHigh == other.nFileIndexHigh
&& this.nFileIndexLow == other.nFileIndexLow;
}
private native void init(FileDescriptor fd) throws IOException;
private static native void initIDs();
static {
IOUtil.load();
initIDs();
}
}