/*
* 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.
*
* 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.
*/
/*
* A simple name service based on an in-memory HashMap.
*/
import java.net.UnknownHostException;
import java.net.InetAddress;
import sun.net.spi.nameservice.*;
import java.util.*;
public final class SimpleNameService implements NameService {
private static LinkedHashMap hosts = new LinkedHashMap();
private static String addrToString(byte addr[]) {
return Byte.toString(addr[0]) + "." +
Byte.toString(addr[1]) + "." +
Byte.toString(addr[2]) + "." +
Byte.toString(addr[3]);
}
// ------------
public static void put(String host, String addr) {
hosts.put(host, addr);
}
public static void put(String host, byte addr[]) {
hosts.put(host, addrToString(addr));
}
public static void remove(String host) {
hosts.remove(host);
}
public static int entries () {
return hosts.size();
}
public static int lookupCalls() {
return lookupCalls;
}
static int lookupCalls = 0;
// ------------
public SimpleNameService() throws Exception {
}
public InetAddress[] lookupAllHostAddr(String host) throws UnknownHostException {
lookupCalls ++;
String value = (String)hosts.get(host);
if (value == null) {
throw new UnknownHostException(host);
}
StringTokenizer st = new StringTokenizer(value, ".");
byte addr[] = new byte[4];
for (int i=0; i<4; i++) {
addr[i] = (byte)Integer.parseInt(st.nextToken());
}
InetAddress[] res = new InetAddress[1];
res[0] = InetAddress.getByAddress(host, addr);
return res;
}
public String getHostByAddr(byte[] addr) throws UnknownHostException {
String addrString = addrToString(addr);
Iterator i = hosts.keySet().iterator();
while (i.hasNext()) {
String host = (String)i.next();
String value = (String)hosts.get(host);
if (value.equals(addrString)) {
return host;
}
}
throw new UnknownHostException();
}
}