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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [java/] [net/] [Inet4Address.java] - Blame information for rev 791

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1 771 jeremybenn
/* Inet4Address.java --
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   Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package java.net;
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import gnu.java.lang.CPStringBuilder;
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import java.io.ObjectStreamException;
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/*
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 * Written using on-line Java Platform 1.4 API Specification and
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 * RFC 1884 (http://www.ietf.org/rfc/rfc1884.txt),
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 * RFC 1918 (http://www.ietf.org/rfc/rfc1918.txt),
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 * RFC 2365 (http://www.ietf.org/rfc/rfc2365.txt)
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 *
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 * @author Michael Koch
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 * @status Believed complete and correct.
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 */
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public final class Inet4Address extends InetAddress
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{
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  /**
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   * For compatability with Sun's JDK 1.4.2 rev. 5
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   */
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  static final long serialVersionUID = 3286316764910316507L;
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  /**
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   * The address family of these addresses (used for serialization).
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   */
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  private static final int AF_INET = 2;
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  /**
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   * Inet4Address objects are serialized as InetAddress objects.
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   */
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  private Object writeReplace() throws ObjectStreamException
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  {
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    return new InetAddress(addr, hostName, AF_INET);
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  }
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  /**
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   * Initializes this object's addr instance variable from the passed in
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   * byte array.  Note that this constructor is protected and is called
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   * only by static methods in this class.
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   *
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   * @param addr The IP number of this address as an array of bytes
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   * @param host The hostname of this IP address.
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   */
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  Inet4Address(byte[] addr, String host)
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  {
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    super(addr, host, AF_INET);
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  }
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  /**
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   * Checks if the address is a multicast address
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   *
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   * @since 1.1
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   */
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  public boolean isMulticastAddress()
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  {
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    return (addr[0] & 0xf0) == 0xe0;
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  }
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  /**
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   * Checks if this address is a loopback address
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   */
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  public boolean isLoopbackAddress()
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  {
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    return (addr[0] & 0xff) == 0x7f;
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  }
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  /**
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   * Checks if this address is a wildcard address
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   *
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   * @since 1.4
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   */
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  public boolean isAnyLocalAddress()
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  {
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    return equals(InetAddress.ANY_IF);
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  }
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  /**
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   * Checks if this address is a link local address
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   *
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   * @since 1.4
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   */
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  public boolean isLinkLocalAddress()
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  {
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    return false;
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  }
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  /**
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   * Checks if this address is a site local address
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   *
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   * @since 1.4
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   */
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  public boolean isSiteLocalAddress()
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  {
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    // 10.0.0.0/8
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    if ((addr[0] & 0xff) == 0x0a)
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      return true;
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    // 172.16.0.0/12
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    if ((addr[0] & 0xff) == 0xac && (addr[1] & 0xf0) == 0x10)
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      return true;
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    // 192.168.0.0/16
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    if ((addr[0] & 0xff) == 0xc0 && (addr[1] & 0xff) == 0xa8)
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      return true;
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    return false;
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  }
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  /**
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   * Checks if this multicast address has global scope
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   *
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   * @since 1.4
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   */
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  public boolean isMCGlobal()
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  {
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    return false;
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  }
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  /**
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   * Checks if this multicast address has node scope
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   *
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   * @since 1.4
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   */
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  public boolean isMCNodeLocal()
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  {
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    return false;
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  }
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  /**
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   * Checks if this multicast address has link scope
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   *
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   * @since 1.4
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   */
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  public boolean isMCLinkLocal()
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  {
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    if (! isMulticastAddress())
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      return false;
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    return ((addr[0] & 0xff) == 0xe0
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            && (addr[1] & 0xff)  == 0x00
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            && (addr[2] & 0xff)  == 0x00);
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  }
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  /**
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   * Checks if this multicast address has site scope
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   *
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   * @since 1.4
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   */
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  public boolean isMCSiteLocal()
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  {
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    return false;
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  }
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  /**
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   * Checks if this multicast address has organization scope
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   *
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   * @since 1.4
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   */
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  public boolean isMCOrgLocal()
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  {
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    return false;
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  }
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  /**
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   * Returns the address of the current instance
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   */
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  public byte[] getAddress()
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  {
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    return (byte[]) addr.clone();
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  }
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  /**
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   * Returns the address as string
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   *
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   * @since 1.0.2
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   */
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  public String getHostAddress()
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  {
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    CPStringBuilder sb = new CPStringBuilder(40);
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    int len = addr.length;
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    int i = 0;
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    for ( ; ; )
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      {
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        sb.append(addr[i] & 0xff);
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        i++;
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        if (i == len)
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          break;
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        sb.append('.');
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      }
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    return sb.toString();
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  }
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  /**
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   * Computes the hashcode of the instance
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   */
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  public int hashCode()
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  {
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    int hash = 0;
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    int len = addr.length;
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    int i = len > 4 ? len - 4 : 0;
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    for (; i < len; i++)
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      hash = (hash << 8) | (addr[i] & 0xFF);
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    return hash;
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  }
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  /**
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   * Compare the current Inet4Address instance with obj
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   *
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   * @param obj Object to compare with
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   */
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  public boolean equals(Object obj)
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  {
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    if (! (obj instanceof InetAddress))
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      return false;
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    byte[] addr1 = addr;
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    byte[] addr2 = ((InetAddress) obj).addr;
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    if (addr1.length != addr2.length)
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      return false;
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    for (int i = addr1.length; --i >= 0;)
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      if (addr1[i] != addr2[i])
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        return false;
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    return true;
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  }
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}

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