1 /*

     2  * Copyright (c) 2006, 2011, 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 }