sipcommrouter.java

来自「java 开发的sip软电话 源码 jain sip」· Java 代码 · 共 174 行

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 *       "This product includes software developed by the
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 * This software consists of voluntary contributions made by many
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 *
 * Portions of this software are based upon public domain software
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package net.java.mais.sip;

import java.util.LinkedList;
import java.util.ListIterator;

import javax.sip.SipStack;
import javax.sip.address.Hop;
import javax.sip.address.Router;
import javax.sip.address.SipURI;
import javax.sip.address.URI;
import javax.sip.header.RouteHeader;
import javax.sip.message.Request;

/**
 * <p>Title: SIP COMMUNICATOR</p>
 * <p>Description:JAIN-SIP Audio/Video phone application</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Organisation: LSIIT laboratory (http://lsiit.u-strasbg.fr) </p>
 * <p>Network Research Team (http://www-r2.u-strasbg.fr))</p>
 * <p>Louis Pasteur University - Strasbourg - France</p>
 * @author Emil Ivov (http://www.emcho.com)
 * @version 1.1
 *
 */
public class SipCommRouter
    implements Router
{
    protected SipStack myStack;
    protected SipCommHop outboundProxy = null;
    protected Router stackRouter = null;
    public SipCommRouter(SipStack sipStack, String outboundProxy)
    {
        this.myStack = sipStack;
        if (outboundProxy != null && outboundProxy.length() > 0) {
            this.outboundProxy = new SipCommHop(outboundProxy);
        }
    }

    /**
     * Return  the default address to forward the request to.
     * The list is organized in the following priority.
     *
     * If the outboung proxy has been specified, then it is used
     * to construct the first element of the list.
     *
     * If the requestURI refers directly to a host, the host and port
     * information are extracted from it and made the next hop on the
     * list.
     *
     * @param sipRequest is the sip request to route.
     *
     */
    public ListIterator getNextHops(Request sipRequest)
    {
        URI requestURI = sipRequest.getRequestURI();
        if (requestURI == null) {
            throw new IllegalArgumentException
                ("Bad message: Null requestURI");
        }
        LinkedList hops = new LinkedList();
        if (outboundProxy != null) {
            hops.add(outboundProxy);
        }
        ListIterator routes = sipRequest.getHeaders(RouteHeader.NAME);
        if (routes != null && routes.hasNext()) {
            while (routes.hasNext()) {
                RouteHeader route = (RouteHeader) routes.next();
                SipURI uri = (SipURI) route.getAddress().getURI();
                int port = uri.getPort();
                port = (port == -1) ? 5060 : port;
                String host = uri.getHost();
                String transport = uri.getTransportParam();
                if (transport == null) {
                    transport = "udp";
                }
                Hop hop = new SipCommHop(host + ':' + port + '/' + transport);
                hops.add(hop);
            }
        }
        else if (requestURI instanceof SipURI &&
                 ( (SipURI) requestURI).getMAddrParam() != null
                 ) {
            SipURI sipURI = ( (SipURI) requestURI);
            String maddr = sipURI.getMAddrParam();
            String transport = sipURI.getTransportParam();
            if (transport == null) {
                transport = "udp";
            }
            int port = 5060;
            Hop hop = new SipCommHop(maddr, port, transport);
            hops.add(hop);
        }
        else if (requestURI instanceof SipURI) {
            SipURI sipURI = ( (SipURI) requestURI);
            int port = sipURI.getPort();
            if (port == -1) {
                port = 5060;
            }
            String host = sipURI.getHost();
            String transport = sipURI.getTransportParam();
            if (transport == null) {
                transport = "UDP";
            }
            Hop hop = new SipCommHop(host + ":" + port + "/" + transport);
            hops.add(hop);
        }
        else {
            throw new IllegalArgumentException("Malformed requestURI");
        }
        return (hops.size() == 0) ? null : hops.listIterator();
    }

    public Hop getOutboundProxy()
    {
        return this.outboundProxy;
    }
}