Source for java.rmi.dgc.VMID

   1: /* VMID.java
   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., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 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: 
  75:   public VMID()
  76:   {
  77:     addr = localAddr;
  78:     uid = new UID();
  79:   }
  80: 
  81:   /**
  82:    * @deprecated
  83:    */
  84:   public static boolean isUnique ()
  85:   {
  86:     return areWeUnique;
  87:   }
  88: 
  89:   public int hashCode ()
  90:   {
  91:     return super.hashCode();
  92:   }
  93: 
  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: 
 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: }