1 /*
2  * Copyright (c) 2008, 2009, 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
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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.
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22  * or visit www.oracle.com if you need additional information or have any
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24  */
25 
26 package sun.nio.fs;
27 
28 /**
29  * Container for device/inode to uniquely identify file.
30  */
31 
32 class UnixFileKey {
33     private final long st_dev;
34     private final long st_ino;
35 
UnixFileKey(long st_dev, long st_ino)36     UnixFileKey(long st_dev, long st_ino) {
37         this.st_dev = st_dev;
38         this.st_ino = st_ino;
39     }
40 
41     @Override
hashCode()42     public int hashCode() {
43         return (int)(st_dev ^ (st_dev >>> 32)) +
44                (int)(st_ino ^ (st_ino >>> 32));
45     }
46 
47     @Override
equals(Object obj)48     public boolean equals(Object obj) {
49         if (obj == this)
50             return true;
51         if (!(obj instanceof UnixFileKey))
52             return false;
53         UnixFileKey other = (UnixFileKey)obj;
54         return (this.st_dev == other.st_dev) && (this.st_ino == other.st_ino);
55     }
56 
57     @Override
toString()58     public String toString() {
59         StringBuilder sb = new StringBuilder();
60         sb.append("(dev=")
61           .append(Long.toHexString(st_dev))
62           .append(",ino=")
63           .append(st_ino)
64           .append(')');
65         return sb.toString();
66     }
67 }
68