1 /*
2   Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version. */
37 
38 package java.rmi.dgc;
39 
40 import java.io.Serializable;
41 import java.net.InetAddress;
42 import java.net.UnknownHostException;
43 import java.rmi.server.UID;
44 
45 public final class VMID	implements Serializable
46 {
47   static final long serialVersionUID = -538642295484486218L;
48 
49   static final boolean areWeUnique;
50 
51   static byte[] localAddr;
52 
53   private byte[] addr;
54 
55   private UID uid;
56 
57   static
58   {
59     byte[] addr;
60     boolean awu = true;
61     try {
62       addr = InetAddress.getLocalHost().getAddress();
63       if (addr[0] == 127 && addr[1] == 0 && addr[2] == 0 && addr[3] == 1) {
64         awu = false;
65       }
66     }
67     catch (UnknownHostException _) {
68       addr = new byte[]{ 127, 0, 0, 1 };
69       awu = false;
70     }
71     localAddr = addr;
72     areWeUnique = awu;
73   }
74 
VMID()75   public VMID()
76   {
77     addr = localAddr;
78     uid = new UID();
79   }
80 
81   /**
82    * @deprecated
83    */
isUnique()84   public static boolean isUnique ()
85   {
86     return areWeUnique;
87   }
88 
hashCode()89   public int hashCode ()
90   {
91     return super.hashCode();
92   }
93 
equals(Object obj)94   public boolean equals (Object obj)
95   {
96     if (!(obj instanceof VMID))
97       {
98         return false;
99       }
100 
101     VMID other = (VMID) obj;
102     if (addr.length != other.addr.length)
103       {
104         return false;
105       }
106 
107     for (int i = addr.length - 1; i >= 0; i--)
108       {
109         if (addr[i] != other.addr[i])
110           {
111             return false;
112           }
113       }
114 
115     return uid.equals(other.uid);
116   }
117 
toString()118   public String toString ()
119   {
120     StringBuffer buf = new StringBuffer ("[VMID: ");
121 
122     for (int i = 0; i < addr.length; i++)
123       {
124         if (i > 0)
125           {
126             buf.append (".");
127           }
128 
129         buf.append (Integer.toString (addr [i]));
130       }
131 
132     buf.append (" ");
133     buf.append (uid.toString ());
134     buf.append ("]");
135 
136     return buf.toString();
137   }
138 }
139