/*
 * Copyright (c) 2002, 2013, 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}
 anyLocalAddress.holder().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<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;
}