/*

 * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package java.net;

import java.io.IOException;

/*

 * Package private implementation of InetAddressImpl for IPv4.

 *

 * @since 1.4

 */

class Inet4AddressImpl implements InetAddressImpl {

    public native String getLocalHostName() throws UnknownHostException;

    public native InetAddress[]

        lookupAllHostAddr(String hostname) throws UnknownHostException;

    public native String getHostByAddr(byte[] addr) throws UnknownHostException;

    private native boolean isReachable0(byte[] addr, int timeout, byte[] ifaddr, int ttl) throws IOException;

    public synchronized InetAddress anyLocalAddress() {

        if (anyLocalAddress == null) {

            anyLocalAddress = new Inet4Address(); // {0x00,0x00,0x00,0x00}

        }

        return anyLocalAddress;

    }

    public synchronized InetAddress loopbackAddress() {

        if (loopbackAddress == null) {

            byte[] loopback = {0x7f,0x00,0x00,0x01};

            loopbackAddress = new Inet4Address("localhost", loopback);

        }

        return loopbackAddress;

    }

  public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {

      byte[] ifaddr = null;

      if (netif != null) {

          /*

           * Let's make sure we use an address of the proper family

           */

          java.util.Enumeration<InetAddress> it = netif.getInetAddresses();

          InetAddress inetaddr = null;

          while (!(inetaddr instanceof Inet4Address) &&

                 it.hasMoreElements())

              inetaddr = it.nextElement();

          if (inetaddr instanceof Inet4Address)

              ifaddr = inetaddr.getAddress();

      }

      return isReachable0(addr.getAddress(), timeout, ifaddr, ttl);

  }

    private InetAddress      anyLocalAddress;

    private InetAddress      loopbackAddress;

}