Source for java.net.Inet4Address

   1: /* Inet4Address.java --
   2:    Copyright (C) 2002, 2003, 2004, 2005  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: 
  39: package java.net;
  40: 
  41: import java.io.ObjectStreamException;
  42: 
  43: /*
  44:  * Written using on-line Java Platform 1.4 API Specification and
  45:  * RFC 1884 (http://www.ietf.org/rfc/rfc1884.txt),
  46:  * RFC 1918 (http://www.ietf.org/rfc/rfc1918.txt),
  47:  * RFC 2365 (http://www.ietf.org/rfc/rfc2365.txt)
  48:  *
  49:  * @author Michael Koch
  50:  * @status Believed complete and correct.
  51:  */
  52: public final class Inet4Address extends InetAddress
  53: {
  54:   /**
  55:    * For compatability with Sun's JDK 1.4.2 rev. 5
  56:    */
  57:   static final long serialVersionUID = 3286316764910316507L;
  58: 
  59:   /**
  60:    * needed for serialization
  61:    */
  62:   private Object writeReplace() throws ObjectStreamException
  63:   {
  64:     return new InetAddress(addr, hostName);
  65:   }
  66:   
  67:   /**
  68:    * Initializes this object's addr instance variable from the passed in
  69:    * byte array.  Note that this constructor is protected and is called
  70:    * only by static methods in this class.
  71:    *
  72:    * @param addr The IP number of this address as an array of bytes
  73:    * @param host The hostname of this IP address.
  74:    */
  75:   Inet4Address(byte[] addr, String host)
  76:   {
  77:     super(addr, host);
  78:   }
  79: 
  80:   /**
  81:    * Checks if the address is a multicast address
  82:    *
  83:    * @since 1.1
  84:    */
  85:   public boolean isMulticastAddress()
  86:   {
  87:     return super.isMulticastAddress();
  88:   }
  89: 
  90:   /**
  91:    * Checks if this address is a loopback address
  92:    */
  93:   public boolean isLoopbackAddress()
  94:   {
  95:     return super.isLoopbackAddress();
  96:   }
  97: 
  98:   /**
  99:    * Checks if this address is a wildcard address
 100:    *
 101:    * @since 1.4
 102:    */
 103:   public boolean isAnyLocalAddress()
 104:   {
 105:     return super.isAnyLocalAddress();
 106:   }
 107: 
 108:   /**
 109:    * Checks if this address is a link local address
 110:    *
 111:    * @since 1.4
 112:    */
 113:   public boolean isLinkLocalAddress()
 114:   {
 115:     return super.isLinkLocalAddress();
 116:   }
 117: 
 118:   /**
 119:    * Checks if this address is a site local address
 120:    *
 121:    * @since 1.4
 122:    */
 123:   public boolean isSiteLocalAddress()
 124:   {
 125:     return super.isSiteLocalAddress();
 126:   }
 127: 
 128:   /**
 129:    * Checks if this multicast address has global scope
 130:    *
 131:    * @since 1.4
 132:    */
 133:   public boolean isMCGlobal()
 134:   {
 135:     return super.isMCGlobal();
 136:   }
 137: 
 138:   /**
 139:    * Checks if this multicast address has node scope
 140:    *
 141:    * @since 1.4
 142:    */
 143:   public boolean isMCNodeLocal()
 144:   {
 145:     return super.isMCNodeLocal();
 146:   }
 147: 
 148:   /**
 149:    * Checks if this multicast address has link scope
 150:    *
 151:    * @since 1.4
 152:    */
 153:   public boolean isMCLinkLocal()
 154:   {
 155:     return super.isMCLinkLocal();
 156:   }
 157: 
 158:   /**
 159:    * Checks if this multicast address has site scope
 160:    *
 161:    * @since 1.4
 162:    */
 163:   public boolean isMCSiteLocal()
 164:   {
 165:     return super.isMCSiteLocal();
 166:   }
 167: 
 168:   /**
 169:    * Checks if this multicast address has organization scope
 170:    *
 171:    * @since 1.4
 172:    */
 173:   public boolean isMCOrgLocal()
 174:   {
 175:     return super.isMCOrgLocal();
 176:   }
 177: 
 178:   /**
 179:    * Returns the address of the current instance
 180:    */
 181:   public byte[] getAddress()
 182:   {
 183:     return (byte[]) addr.clone();
 184:   }
 185: 
 186:   /**
 187:    * Returns the address as string
 188:    *
 189:    * @since 1.0.2
 190:    */
 191:   public String getHostAddress()
 192:   {
 193:     return super.getHostAddress();
 194:   }
 195: 
 196:   /**
 197:    * Computes the hashcode of the instance
 198:    */
 199:   public int hashCode()
 200:   {
 201:     int hash = 0;
 202:     int len = addr.length;
 203:     int i = len > 4 ? len - 4 : 0;
 204: 
 205:     for (; i < len; i++)
 206:       hash = (hash << 8) | (addr[i] & 0xFF);
 207: 
 208:     return hash;
 209:   }
 210: 
 211:   /**
 212:    * Compare the current Inet4Address instance with obj
 213:    *
 214:    * @param obj Object to compare with
 215:    */
 216:   public boolean equals(Object obj)
 217:   {
 218:     if (! (obj instanceof InetAddress))
 219:       return false;
 220: 
 221:     byte[] addr1 = addr;
 222:     byte[] addr2 = ((InetAddress) obj).addr;
 223: 
 224:     if (addr1.length != addr2.length)
 225:       return false;
 226: 
 227:     for (int i = addr1.length; --i >= 0;)
 228:       if (addr1[i] != addr2[i])
 229:     return false;
 230: 
 231:     return true;
 232:   }
 233: }