103 lines
3.1 KiB
Java
103 lines
3.1 KiB
Java
/*
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* Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* A simple name service based on an in-memory HashMap.
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*/
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import java.net.UnknownHostException;
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import java.net.InetAddress;
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import sun.net.spi.nameservice.*;
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import java.util.*;
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public final class SimpleNameService implements NameService {
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private static LinkedHashMap hosts = new LinkedHashMap();
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private static String addrToString(byte addr[]) {
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return Byte.toString(addr[0]) + "." +
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Byte.toString(addr[1]) + "." +
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Byte.toString(addr[2]) + "." +
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Byte.toString(addr[3]);
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}
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// ------------
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public static void put(String host, String addr) {
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hosts.put(host, addr);
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}
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public static void put(String host, byte addr[]) {
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hosts.put(host, addrToString(addr));
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}
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public static void remove(String host) {
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hosts.remove(host);
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}
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public static int entries () {
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return hosts.size();
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}
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public static int lookupCalls() {
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return lookupCalls;
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}
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static int lookupCalls = 0;
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// ------------
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public SimpleNameService() throws Exception {
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}
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public InetAddress[] lookupAllHostAddr(String host) throws UnknownHostException {
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lookupCalls ++;
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String value = (String)hosts.get(host);
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if (value == null) {
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throw new UnknownHostException(host);
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}
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StringTokenizer st = new StringTokenizer(value, ".");
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byte addr[] = new byte[4];
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for (int i=0; i<4; i++) {
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addr[i] = (byte)Integer.parseInt(st.nextToken());
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}
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InetAddress[] res = new InetAddress[1];
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res[0] = InetAddress.getByAddress(host, addr);
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return res;
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}
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public String getHostByAddr(byte[] addr) throws UnknownHostException {
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String addrString = addrToString(addr);
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Iterator i = hosts.keySet().iterator();
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while (i.hasNext()) {
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String host = (String)i.next();
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String value = (String)hosts.get(host);
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if (value.equals(addrString)) {
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return host;
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}
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}
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throw new UnknownHostException();
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}
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}
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