1 /*
2 * Conditions Of Use
3 *
4 * This software was developed by employees of the National Institute of
5 * Standards and Technology (NIST), an agency of the Federal Government.
6 * Pursuant to title 15 Untied States Code Section 105, works of NIST
7 * employees are not subject to copyright protection in the United States
8 * and are considered to be in the public domain.  As a result, a formal
9 * license is not needed to use the software.
10 *
11 * This software is provided by NIST as a service and is expressly
12 * provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
13 * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
14 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
15 * AND DATA ACCURACY.  NIST does not warrant or make any representations
16 * regarding the use of the software or the results thereof, including but
17 * not limited to the correctness, accuracy, reliability or usefulness of
18 * the software.
19 *
20 * Permission to use this software is contingent upon your acceptance
21 * of the terms of this agreement
22 *
23 * .
24 *
25 */
26 package gov.nist.javax.sip;
27 
28 import java.net.InetAddress;
29 import java.net.UnknownHostException;
30 
31 import javax.sip.address.Hop;
32 
33 import gov.nist.core.net.AddressResolver;
34 import gov.nist.javax.sip.stack.HopImpl;
35 import gov.nist.javax.sip.stack.MessageProcessor;
36 
37 /**
38  * This is the default implementation of the AddressResolver. The AddressResolver is a NIST-SIP specific
39  * feature. The address resolover is consulted to convert a Hop into a meaningful address. The default
40  * implementation is a passthrough. It only gets involved in setting the default port. However, you
41  * can register your own AddressResolver implementation
42  * Note that
43  * The RI checks incoming via headers for resolving the sentBy field. If you want to set it to
44  * some address that cannot be resolved you should register an AddressResolver with the stack.
45  * This feature is also useful for DNS SRV lookup which is not implemented by the RI at present.
46  *
47  * @version 1.2
48  * @since 1.2
49  * @see gov.nist.javax.sip.SipStackImpl#setAddressResolver(AddressResolver)
50  *
51  * @author M. Ranganathan
52  *
53  */
54 public class DefaultAddressResolver implements AddressResolver {
55 
56     public DefaultAddressResolver() {
57 
58     }
59     /*
60      * (non-Javadoc)
61      * @see gov.nist.core.net.AddressResolver#resolveAddress(javax.sip.address.Hop)
62      */
63     public Hop resolveAddress(Hop inputAddress) {
64         if  (inputAddress.getPort()  != -1)
65             return inputAddress;
66         else {
67             return new HopImpl(inputAddress.getHost(),
68                     MessageProcessor.getDefaultPort(inputAddress.getTransport()),inputAddress.getTransport());
69         }
70     }
71 
72 
73 
74 }
75