1 /* Inet4Address.java --
2 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
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)
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.
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
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
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. */
41 import java.io.ObjectStreamException;
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)
49 * @author Michael Koch
50 * @status Believed complete and correct.
52 public final class Inet4Address extends InetAddress
55 * For compatability with Sun's JDK 1.4.2 rev. 5
57 static final long serialVersionUID = 3286316764910316507L;
60 * The address family of these addresses (used for serialization).
62 private static final int FAMILY = 2; // AF_INET
65 * Inet4Address objects are serialized as InetAddress objects.
67 private Object writeReplace() throws ObjectStreamException
69 return new InetAddress(addr, hostName, FAMILY);
73 * Initializes this object's addr instance variable from the passed in
74 * byte array. Note that this constructor is protected and is called
75 * only by static methods in this class.
77 * @param addr The IP number of this address as an array of bytes
78 * @param host The hostname of this IP address.
80 Inet4Address(byte[] addr, String host)
82 super(addr, host, FAMILY);
86 * Checks if the address is a multicast address
90 public boolean isMulticastAddress()
92 return (addr[0] & 0xf0) == 0xe0;
96 * Checks if this address is a loopback address
98 public boolean isLoopbackAddress()
100 return (addr[0] & 0xff) == 0x7f;
104 * Checks if this address is a wildcard address
108 public boolean isAnyLocalAddress()
110 return equals(InetAddress.ANY_IF);
114 * Checks if this address is a link local address
118 public boolean isLinkLocalAddress()
124 * Checks if this address is a site local address
128 public boolean isSiteLocalAddress()
131 if ((addr[0] & 0xff) == 0x0a)
135 if ((addr[0] & 0xff) == 0xac && (addr[1] & 0xf0) == 0x10)
139 if ((addr[0] & 0xff) == 0xc0 && (addr[1] & 0xff) == 0xa8)
146 * Checks if this multicast address has global scope
150 public boolean isMCGlobal()
156 * Checks if this multicast address has node scope
160 public boolean isMCNodeLocal()
166 * Checks if this multicast address has link scope
170 public boolean isMCLinkLocal()
172 if (! isMulticastAddress())
175 return ((addr[0] & 0xff) == 0xe0
176 && (addr[1] & 0xff) == 0x00
177 && (addr[2] & 0xff) == 0x00);
181 * Checks if this multicast address has site scope
185 public boolean isMCSiteLocal()
191 * Checks if this multicast address has organization scope
195 public boolean isMCOrgLocal()
201 * Returns the address of the current instance
203 public byte[] getAddress()
205 return (byte[]) addr.clone();
209 * Returns the address as string
213 public String getHostAddress()
215 StringBuffer sb = new StringBuffer(40);
217 int len = addr.length;
222 sb.append(addr[i] & 0xff);
231 return sb.toString();
235 * Computes the hashcode of the instance
237 public int hashCode()
240 int len = addr.length;
241 int i = len > 4 ? len - 4 : 0;
244 hash = (hash << 8) | (addr[i] & 0xFF);
250 * Compare the current Inet4Address instance with obj
252 * @param obj Object to compare with
254 public boolean equals(Object obj)
256 if (! (obj instanceof InetAddress))
260 byte[] addr2 = ((InetAddress) obj).addr;
262 if (addr1.length != addr2.length)
265 for (int i = addr1.length; --i >= 0;)
266 if (addr1[i] != addr2[i])