/*    This file is part of Peers.    This program is free software: you can redistribute it and/or modify    it under the terms of the GNU General Public License as published by    the Free Software Foundation, either version 3 of the License, or    any later version.    This program is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    GNU General Public License for more details.    You should have received a copy of the GNU General Public License    along with this program.  If not, see <http://www.gnu.org/licenses/>.        Copyright 2007, 2008 Yohann Martineau */package net.sourceforge.peers.sip.core.useragent;import java.io.IOException;import java.util.ArrayList;import net.sourceforge.peers.sip.RFC3261;import net.sourceforge.peers.sip.Utils;import net.sourceforge.peers.sip.syntaxencoding.SipHeaderFieldName;import net.sourceforge.peers.sip.syntaxencoding.SipHeaderFieldValue;import net.sourceforge.peers.sip.syntaxencoding.SipHeaderParamName;import net.sourceforge.peers.sip.syntaxencoding.SipHeaders;import net.sourceforge.peers.sip.transactionuser.Dialog;import net.sourceforge.peers.sip.transactionuser.DialogManager;import net.sourceforge.peers.sip.transport.SipMessage;import net.sourceforge.peers.sip.transport.SipRequest;import net.sourceforge.peers.sip.transport.SipResponse;import net.sourceforge.peers.sip.transport.SipServerTransportUser;import net.sourceforge.peers.sip.transport.TransportManager;public class UAS implements SipServerTransportUser {    public final static ArrayList<String> SUPPORTED_METHODS;        static {        SUPPORTED_METHODS = new ArrayList<String>();        SUPPORTED_METHODS.add(RFC3261.METHOD_INVITE);        SUPPORTED_METHODS.add(RFC3261.METHOD_CANCEL);    };        private static UAS INSTANCE;        public static UAS getInstance() {        if (INSTANCE == null) {            INSTANCE = new UAS();        }        return INSTANCE;    }        private InitialRequestManager initialRequestManager;    private MidDialogRequestManager midDialogRequestManager;        private UAS() {        initialRequestManager = new InitialRequestManager();        midDialogRequestManager = new MidDialogRequestManager();//        SipTransportFactory.getInstance().createServerTransport(this,//                Utils.getInstance().getSipPort(), RFC3261.TRANSPORT_UDP);        //TODO make it configurable        try {            TransportManager.getInstance().createServerTransport(                    RFC3261.TRANSPORT_UDP, Utils.getInstance().getSipPort());        } catch (IOException e) {            e.printStackTrace();        }    }        public void messageReceived(SipMessage sipMessage) {        if (sipMessage instanceof SipRequest) {            requestReceived((SipRequest) sipMessage);        } else if (sipMessage instanceof SipResponse) {            responseReceived((SipResponse) sipMessage);        } else {            throw new RuntimeException("unknown message type");        }    }    private void responseReceived(SipResponse sipResponse) {            }        private void requestReceived(SipRequest sipRequest) {        //TODO 8.2                //TODO JTA to make request processing atomic                SipHeaders headers = sipRequest.getSipHeaders();                //TODO find whether the request is within an existing dialog or not        SipHeaderFieldValue to =            headers.get(new SipHeaderFieldName(RFC3261.HDR_TO));        String toTag = to.getParam(new SipHeaderParamName(RFC3261.PARAM_TAG));        if (toTag != null) {            Dialog dialog = DialogManager.getInstance().getDialog(sipRequest);            if (dialog != null) {                //this is a mid-dialog request                midDialogRequestManager.manageMidDialogRequest(sipRequest, dialog);                //TODO continue processing            } else {                //TODO reject the request with a 481 Call/Transaction Does Not Exist                            }        } else {                        initialRequestManager.manageInitialRequest(sipRequest);                    }    }    public InitialRequestManager getInitialRequestManager() {        return initialRequestManager;    }    public MidDialogRequestManager getMidDialogRequestManager() {        return midDialogRequestManager;    }    }