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 /*
 * Conditions Of Use
 *
 * This software was developed by employees of the National Institute of
 * Standards and Technology (NIST), an agency of the Federal Government.
 * Pursuant to title 15 Untied States Code Section 105, works of NIST
 * employees are not subject to copyright protection in the United States
 * and are considered to be in the public domain.  As a result, a formal
 * license is not needed to use the software.
* This software is provided by NIST as a service and is expressly
* provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
* .
*/
package gov.nist.javax.sip;
This is the default implementation of the AddressResolver. The AddressResolver is a NIST-SIP specific feature. The address resolover is consulted to convert a Hop into a meaningful address. The default implementation is a passthrough. It only gets involved in setting the default port. However, you can register your own AddressResolver implementation Note that The RI checks incoming via headers for resolving the sentBy field. If you want to set it to some address that cannot be resolved you should register an AddressResolver with the stack. This feature is also useful for DNS SRV lookup which is not implemented by the RI at present.

public class DefaultAddressResolver implements AddressResolver {
    public DefaultAddressResolver() {
    }
    /*
     * (non-Javadoc)
     * @see gov.nist.core.net.AddressResolver#resolveAddress(javax.sip.address.Hop)
     */
    public Hop resolveAddress(Hop inputAddress) {
        if  (inputAddress.getPort()  != -1)
            return inputAddress;
        else {
            return new HopImpl(inputAddress.getHost(),
                    MessageProcessor.getDefaultPort(inputAddress.getTransport()),inputAddress.getTransport());
        }
    }
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