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 }