1 /*
   2  * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  */
  26 
  27 import java.net.*;
  28 import java.util.*;
  29 import sun.net.spi.nameservice.*;
  30 
  31 
  32 public class SimpleNameService implements NameService {
  33     // host name <-> host addr mapping
  34     private HashMap<String, String> hosts = new LinkedHashMap<String, String>();
  35 
  36     public void put(String host, String addr) {
  37         hosts.put(host, addr);
  38     }
  39 
  40     private static String addrToString(byte addr[]) {
  41         return Byte.toString(addr[0]) + "." +
  42                Byte.toString(addr[1]) + "." +
  43                Byte.toString(addr[2]) + "." +
  44                Byte.toString(addr[3]);
  45     }
  46 
  47     public SimpleNameService() {
  48     }
  49 
  50     public InetAddress[] lookupAllHostAddr(String host) throws UnknownHostException {
  51         String addr = hosts.get(host);
  52         if (addr == null) {
  53             throw new UnknownHostException(host);
  54         }
  55 
  56         StringTokenizer tokenizer = new StringTokenizer(addr, ".");
  57         byte addrs[] = new byte[4];
  58         for (int i = 0; i < 4; i++) {
  59             addrs[i] = (byte)Integer.parseInt(tokenizer.nextToken());
  60         }
  61         InetAddress[] ret = new InetAddress[1];
  62         ret[0] = InetAddress.getByAddress(host, addrs);
  63         return ret;
  64     }
  65 
  66     public String getHostByAddr(byte[] addr) throws UnknownHostException {
  67         String addrString = addrToString(addr);
  68         Iterator i = hosts.keySet().iterator();
  69         while (i.hasNext()) {
  70             String host = (String)i.next();
  71             String value = (String)hosts.get(host);
  72             if (value.equals(addrString)) {
  73                 return host;
  74             }
  75         }
  76         throw new UnknownHostException();
  77     }
  78 }