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      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