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/* Inet6Address.java --

   Copyright (C) 2002, 2003, 2004  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.util.Arrays;

/*

 * Written using on-line Java Platform 1.4 API Specification and

 * RFC 1884 (http://www.ietf.org/rfc/rfc1884.txt)

 *

 * @author Michael Koch

 * @status Believed complete and correct.

 */

public final class Inet6Address extends InetAddress

{

  static final long serialVersionUID = 6880410070516793377L;

  /**

   * Needed for serialization

   */

  byte[] ipaddress;

  /**

   * Create an Inet6Address object

   *

   * @param addr The IP address

   * @param host The hostname

   */

  Inet6Address(byte[] addr, String host)

  {

    super(addr, host);

    // Super constructor clones the addr.  Get a reference to the clone.

    this.ipaddress = this.addr;

  }

  /**

   * Utility routine to check if the InetAddress is an IP multicast address

   *

   * @since 1.1

   */

  public boolean isMulticastAddress()

  {

    return ipaddress[0] == 0xFF;

  }

  /**

   * Utility routine to check if the InetAddress in a wildcard address

   *

   * @since 1.4

   */

  public boolean isAnyLocalAddress()

  {

    byte[] anylocal = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

    return Arrays.equals(ipaddress, anylocal);

  }

  /**

   * Utility routine to check if the InetAddress is a loopback address

   *

   * @since 1.4

   */

  public boolean isLoopbackAddress()

  {

    byte[] loopback = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 };

    return Arrays.equals(ipaddress, loopback);

  }

  /**

   * Utility routine to check if the InetAddress is an link local address

   *

   * @since 1.4

   */

  public boolean isLinkLocalAddress()

  {

    return ipaddress[0] == 0xFA;

  }

  /**

   * Utility routine to check if the InetAddress is a site local address

   *

   * @since 1.4

   */

  public boolean isSiteLocalAddress()

  {

    return ipaddress[0] == 0xFB;

  }

  /**

   * Utility routine to check if the multicast address has global scope

   *

   * @since 1.4

   */

  public boolean isMCGlobal()

  {

    if (! isMulticastAddress())

      return false;

    return (ipaddress[1] & 0x0F) == 0xE;

  }

  /**

   * Utility routine to check if the multicast address has node scope

   *

   * @since 1.4

   */

  public boolean isMCNodeLocal()

  {

    if (! isMulticastAddress())

      return false;

    return (ipaddress[1] & 0x0F) == 0x1;

  }

  /**

   * Utility routine to check if the multicast address has link scope

   *

   * @since 1.4

   */

  public boolean isMCLinkLocal()

  {

    if (! isMulticastAddress())

      return false;

    return (ipaddress[1] & 0x0F) == 0x2;

  }

  /**

   * Utility routine to check if the multicast address has site scope

   *

   * @since 1.4

   */

  public boolean isMCSiteLocal()

  {

    if (! isMulticastAddress())

      return false;

    return (ipaddress[1] & 0x0F) == 0x5;

  }

  /**

   * Utility routine to check if the multicast address has organization scope

   *

   * @since 1.4

   */

  public boolean isMCOrgLocal()

  {

    if (! isMulticastAddress())

      return false;

    return (ipaddress[1] & 0x0F) == 0x8;

  }

  /**

   * Returns the raw IP address of this InetAddress object. The result is in

   * network byte order: the highest order byte of the address is i

   * n getAddress()[0]

   */

  public byte[] getAddress()

  {

    return (byte[]) ipaddress.clone();

  }

  /**

   * Returns the IP address string in textual presentation

   */

  public String getHostAddress()

  {

    StringBuffer sbuf = new StringBuffer(40);

    for (int i = 0; i < 16; i += 2)

      {

        int x = ((ipaddress[i] & 0xFF) << 8) | (ipaddress[i + 1] & 0xFF);

        if (i > 0)

          sbuf.append(':');

        sbuf.append(Integer.toHexString(x));

      }

    return sbuf.toString();

  }

  /**

   * Returns a hashcode for this IP address

   */

  public int hashCode()

  {

    return super.hashCode();

  }

  /**

   * Compares this object against the specified object

   */

  public boolean equals(Object obj)

  {

    if (! (obj instanceof Inet6Address))

      return false;

    // this.ipaddress is never set in this class except to

    // the value of the super class' addr.  The super classes

    // equals(Object) will do the compare.

    return super.equals(obj);

  }

  /**

   * Utility routine to check if the InetAddress is an

   * IPv4 compatible IPv6 address

   *

   * @since 1.4

   */

  public boolean isIPv4CompatibleAddress()

  {

    if (ipaddress[0] != 0x00 || ipaddress[1] != 0x00 || ipaddress[2] != 0x00

        || ipaddress[3] != 0x00 || ipaddress[4] != 0x00

        || ipaddress[5] != 0x00 || ipaddress[6] != 0x00

        || ipaddress[7] != 0x00 || ipaddress[8] != 0x00

        || ipaddress[9] != 0x00 || ipaddress[10] != 0x00

        || ipaddress[11] != 0x00)

      return false;

    return true;

  }

}