/*
 * @(#)Inet4AddressImpl.java	1.6 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
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}
            anyLocalAddress.hostName = "0.0.0.0";
        }
        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 it = netif.getInetAddresses();
	  InetAddress inetaddr = null;
	  while (!(inetaddr instanceof Inet4Address) &&
		 it.hasMoreElements())
	      inetaddr = (InetAddress) it.nextElement();
	  if (inetaddr instanceof Inet4Address)
	      ifaddr = inetaddr.getAddress();
      }
      return isReachable0(addr.getAddress(), timeout, ifaddr, ttl);
  }
    private InetAddress      anyLocalAddress;
    private InetAddress      loopbackAddress;
}