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/* InetSocketAddress.java --

   Copyright (C) 2002, 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;

/**

 * InetSocketAddress instances represent socket addresses

 * in the java.nio package. They encapsulate a InetAddress and

 * a port number.

 *

 * @since 1.4

 */

public class InetSocketAddress extends SocketAddress

{

  /**

   * Compatible with JDK 1.4+

   */

  private static final long serialVersionUID = 5076001401234631237L;

  /**

   * Name of host.

   */

  private String hostname;

  /**

   * Address of host.

   */

  private InetAddress addr;

  /**

   * Port of host.

   */

  private int port;

  /**

   * Constructs an InetSocketAddress instance.

   *

   * @param addr Address of the socket

   * @param port Port if the socket

   *

   * @exception IllegalArgumentException If the port number is illegel

   */

  public InetSocketAddress(InetAddress addr, int port)

    throws IllegalArgumentException

  {

    if (port < 0 || port > 65535)

      throw new IllegalArgumentException("Bad port number: " + port);

    if (addr == null)

      addr = InetAddress.ANY_IF;

    this.addr = addr;

    this.port = port;

  }

  /**

   * Constructs an InetSocketAddress instance.

   *

   * @param port Port if the socket

   *

   * @exception IllegalArgumentException If the port number is illegal

   */

  public InetSocketAddress(int port) throws IllegalArgumentException

  {

    this((InetAddress) null, port);

  }

  /**

   * Constructs an InetSocketAddress instance.

   *

   * @param hostname The hostname for the socket address

   * @param port The port for the socket address

   *

   * @exception IllegalArgumentException If the port number is illegal or

   * the hostname argument is null

   */

  public InetSocketAddress(String hostname, int port)

  {

    this(hostname, port, true);

  }

  /**

   * Constructs an InetSocketAddress instance.

   *

   * @param hostname The hostname for the socket address

   * @param port The port for the socket address

   * @param resolve <code>true</code> if the address has to be resolved,

   * <code>false</code> otherwise

   *

   * @exception IllegalArgumentException If the port number is illegal or

   * the hostname argument is null

   */

  private InetSocketAddress(String hostname, int port, boolean resolve)

  {

    if (hostname == null)

      throw new IllegalArgumentException("Null host name value");

    if (port < 0 || port > 65535)

      throw new IllegalArgumentException("Bad port number: " + port);

    this.port = port;

    this.hostname = hostname;

    this.addr = null;

    if (resolve)

    {

      try

        {

          this.addr = InetAddress.getByName(hostname);

        }

      catch (Exception e) // UnknownHostException, SecurityException

        {

          // Do nothing here. this.addr is already set to null.

        }

    }

  }

  /**

   * Creates an unresolved <code>InetSocketAddress</code> object.

   *

   * @param hostname The hostname for the socket address

   * @param port The port for the socket address

   *

   * @exception IllegalArgumentException If the port number is illegal or

   * the hostname argument is null

   *

   * @since 1.5

   */

  public static InetSocketAddress createUnresolved(String hostname, int port)

  {

    return new InetSocketAddress(hostname, port, false);

  }

  /**

   * Test if obj is a <code>InetSocketAddress</code> and

   * has the same address and port

   *

   * @param obj The obj to compare this address with.

   *

   * @return True if obj is equal.

   */

  public final boolean equals(Object obj)

  {

    // InetSocketAddress objects are equal when addr and port are equal.

    // The hostname may differ.

    if (obj instanceof InetSocketAddress)

      {

        InetSocketAddress sa = (InetSocketAddress) obj;

        if (addr == null && sa.addr != null)

          return false;

        else if (addr == null && sa.addr == null) // we know hostname != null

          return hostname.equals(sa.hostname) && sa.port == port;

        else

          return addr.equals(sa.addr) && sa.port == port;

      }

    return false;

  }

  /**

   * Returns the <code>InetAddress</code> or

   * <code>null</code> if its unresolved

   *

   * @return The IP address of this address.

   */

  public final InetAddress getAddress()

  {

    return addr;

  }

  /**

   * Returns <code>hostname</code>

   *

   * @return The hostname of this address.

   */

  public final String getHostName()

  {

    if (hostname == null) // we know addr != null

      hostname = addr.getHostName();

    return hostname;

  }

  /**

   * Returns the <code>port</code>

   *

   * @return The port of this address.

   */

  public final int getPort()

  {

    return port;

  }

  /**

   * Returns the hashcode of the <code>InetSocketAddress</code>

   *

   * @return The hashcode for this address.

   */

  public final int hashCode()

  {

    return port + addr.hashCode();

  }

  /**

   * Checks wether the address has been resolved or not

   *

   * @return True if address is unresolved.

   */

  public final boolean isUnresolved()

  {

    return addr == null;

  }

  /**

   * Returns the <code>InetSocketAddress</code> as string

   *

   * @return A string representation of this address.

   */

  public String toString()

  {

    // Note: if addr is null, then hostname != null.

    return (addr == null ? hostname : addr.toString()) + ":" + port;

  }

}