| /* |
| * Copyright (c) 2002, 2006, 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(); |
| } |
| } |