| /* Inet4Address.java -- |
| Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.net; |
| |
| import java.io.ObjectStreamException; |
| |
| /* |
| * Written using on-line Java Platform 1.4 API Specification and |
| * RFC 1884 (http://www.ietf.org/rfc/rfc1884.txt), |
| * RFC 1918 (http://www.ietf.org/rfc/rfc1918.txt), |
| * RFC 2365 (http://www.ietf.org/rfc/rfc2365.txt) |
| * |
| * @author Michael Koch |
| * @status Believed complete and correct. |
| */ |
| public final class Inet4Address extends InetAddress |
| { |
| /** |
| * For compatability with Sun's JDK 1.4.2 rev. 5 |
| */ |
| static final long serialVersionUID = 3286316764910316507L; |
| |
| /** |
| * The address family of these addresses (used for serialization). |
| */ |
| private static final int FAMILY = 2; // AF_INET |
| |
| /** |
| * Inet4Address objects are serialized as InetAddress objects. |
| */ |
| private Object writeReplace() throws ObjectStreamException |
| { |
| return new InetAddress(addr, hostName, FAMILY); |
| } |
| |
| /** |
| * Initializes this object's addr instance variable from the passed in |
| * byte array. Note that this constructor is protected and is called |
| * only by static methods in this class. |
| * |
| * @param addr The IP number of this address as an array of bytes |
| * @param host The hostname of this IP address. |
| */ |
| Inet4Address(byte[] addr, String host) |
| { |
| super(addr, host, FAMILY); |
| } |
| |
| /** |
| * Checks if the address is a multicast address |
| * |
| * @since 1.1 |
| */ |
| public boolean isMulticastAddress() |
| { |
| return (addr[0] & 0xf0) == 0xe0; |
| } |
| |
| /** |
| * Checks if this address is a loopback address |
| */ |
| public boolean isLoopbackAddress() |
| { |
| return (addr[0] & 0xff) == 0x7f; |
| } |
| |
| /** |
| * Checks if this address is a wildcard address |
| * |
| * @since 1.4 |
| */ |
| public boolean isAnyLocalAddress() |
| { |
| return equals(InetAddress.ANY_IF); |
| } |
| |
| /** |
| * Checks if this address is a link local address |
| * |
| * @since 1.4 |
| */ |
| public boolean isLinkLocalAddress() |
| { |
| return false; |
| } |
| |
| /** |
| * Checks if this address is a site local address |
| * |
| * @since 1.4 |
| */ |
| public boolean isSiteLocalAddress() |
| { |
| // 10.0.0.0/8 |
| if ((addr[0] & 0xff) == 0x0a) |
| return true; |
| |
| // 172.16.0.0/12 |
| if ((addr[0] & 0xff) == 0xac && (addr[1] & 0xf0) == 0x10) |
| return true; |
| |
| // 192.168.0.0/16 |
| if ((addr[0] & 0xff) == 0xc0 && (addr[1] & 0xff) == 0xa8) |
| return true; |
| |
| return false; |
| } |
| |
| /** |
| * Checks if this multicast address has global scope |
| * |
| * @since 1.4 |
| */ |
| public boolean isMCGlobal() |
| { |
| return false; |
| } |
| |
| /** |
| * Checks if this multicast address has node scope |
| * |
| * @since 1.4 |
| */ |
| public boolean isMCNodeLocal() |
| { |
| return false; |
| } |
| |
| /** |
| * Checks if this multicast address has link scope |
| * |
| * @since 1.4 |
| */ |
| public boolean isMCLinkLocal() |
| { |
| if (! isMulticastAddress()) |
| return false; |
| |
| return ((addr[0] & 0xff) == 0xe0 |
| && (addr[1] & 0xff) == 0x00 |
| && (addr[2] & 0xff) == 0x00); |
| } |
| |
| /** |
| * Checks if this multicast address has site scope |
| * |
| * @since 1.4 |
| */ |
| public boolean isMCSiteLocal() |
| { |
| return false; |
| } |
| |
| /** |
| * Checks if this multicast address has organization scope |
| * |
| * @since 1.4 |
| */ |
| public boolean isMCOrgLocal() |
| { |
| return false; |
| } |
| |
| /** |
| * Returns the address of the current instance |
| */ |
| public byte[] getAddress() |
| { |
| return (byte[]) addr.clone(); |
| } |
| |
| /** |
| * Returns the address as string |
| * |
| * @since 1.0.2 |
| */ |
| public String getHostAddress() |
| { |
| StringBuffer sb = new StringBuffer(40); |
| |
| int len = addr.length; |
| int i = 0; |
| |
| for ( ; ; ) |
| { |
| sb.append(addr[i] & 0xff); |
| i++; |
| |
| if (i == len) |
| break; |
| |
| sb.append('.'); |
| } |
| |
| return sb.toString(); |
| } |
| |
| /** |
| * Computes the hashcode of the instance |
| */ |
| public int hashCode() |
| { |
| int hash = 0; |
| int len = addr.length; |
| int i = len > 4 ? len - 4 : 0; |
| |
| for (; i < len; i++) |
| hash = (hash << 8) | (addr[i] & 0xFF); |
| |
| return hash; |
| } |
| |
| /** |
| * Compare the current Inet4Address instance with obj |
| * |
| * @param obj Object to compare with |
| */ |
| public boolean equals(Object obj) |
| { |
| if (! (obj instanceof InetAddress)) |
| return false; |
| |
| byte[] addr1 = addr; |
| byte[] addr2 = ((InetAddress) obj).addr; |
| |
| if (addr1.length != addr2.length) |
| return false; |
| |
| for (int i = addr1.length; --i >= 0;) |
| if (addr1[i] != addr2[i]) |
| return false; |
| |
| return true; |
| } |
| } |