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Java > Open Source Codes > org > jacorb > orb > dns > JdkDelegateImpl


1 package org.jacorb.orb.dns;
2
3 /*
4  * JacORB - a free Java ORB
5  *
6  * Copyright (C) 1997-2004 Gerald Brose.
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Library General Public
10  * License as published by the Free Software Foundation; either
11  * version 2 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Library General Public License for more details.
17  *
18  * You should have received a copy of the GNU Library General Public
19  * License along with this library; if not, write to the Free
20  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23 import java.net.*;
24
25 import org.apache.avalon.framework.logger.Logger;
26
27
28 /**
29  * A DNS Delegate that resolves names using the JDK methods.
30  * This only works reliably since JDK 1.4.
31  *
32  * @author <a HREF="mailto:spiegel@gnu.org">Andre Spiegel</a>
33  * @version $Id: JdkDelegateImpl.java,v 1.3 2004/05/06 12:40:00 nicolas Exp $
34  */
35
36 public class JdkDelegateImpl
37     implements DNSLookupDelegate
38 {
39     Logger logger;
40
41     JdkDelegateImpl(Logger logger)
42     {
43         this.logger = logger;
44     }
45
46     public String JavaDoc inverseLookup(String JavaDoc ip)
47     {
48         try
49         {
50             return InetAddress.getByName(ip).getHostName();
51         }
52         catch (UnknownHostException e)
53         {
54             if (logger.isWarnEnabled())
55             {
56                 logger.warn("Could not resolve IP " + ip);
57             }
58             return null;
59         }
60     }
61
62     public String JavaDoc inverseLookup (InetAddress addr)
63     {
64         return addr.getHostName();
65     }
66
67 }
68
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