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*/
26package gov.nist.javax.sip;
27
28import java.net.InetAddress;
29import java.net.UnknownHostException;
30
31import javax.sip.address.Hop;
32
33import gov.nist.core.net.AddressResolver;
34import gov.nist.javax.sip.stack.HopImpl;
35import 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 */
54public 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