content: /*
  * 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
  *  
  * .
  * 
  */
  /*******************************************************************************
   * Product of NIST/ITL Advanced Networking Technologies Division (ANTD).        *
   *******************************************************************************/
  
  package gov2.nist.javax2.sip;
  
  import gov2.nist.javax2.sip.message.*;
  import gov2.nist.javax2.sip.stack.*;
  
  import javax2.sip.*;
  
  /**
   * Implements all the support classes that are necessary for the nist-sip stack
   * on which the jain-sip stack has been based. This is a mapping class to map
   * from the NIST-SIP abstractions to the JAIN abstractions. (i.e. It is the glue
   * code that ties the NIST-SIP event model and the JAIN-SIP event model
   * together. When a SIP Request or SIP Response is read from the corresponding
   * messageChannel, the NIST-SIP stack calls the SIPStackMessageFactory
   * implementation that has been registered with it to process the request.)
   * 
   * @version 1.2 $Revision: 1.14 $ $Date: 2009/07/29 20:38:17 $
   * 
   * @author M. Ranganathan <br/>
   * 
   *  
   */
  class NistSipMessageFactoryImpl implements StackMessageFactory {
  
      private SipStackImpl sipStack;
  
      /**
       * Construct a new SIP Server Request.
       * 
       * @param sipRequest
       *            is the SIPRequest from which the SIPServerRequest is to be
       *            constructed.
       * @param messageChannel
       *            is the MessageChannel abstraction for this SIPServerRequest.
       */
      public ServerRequestInterface newSIPServerRequest(SIPRequest sipRequest,
              MessageChannel messageChannel) {
  
          if (messageChannel == null || sipRequest == null) {
              throw new IllegalArgumentException("Null Arg!");
          }
  
          SipStackImpl theStack = (SipStackImpl) messageChannel.getSIPStack();
          DialogFilter retval = new DialogFilter(
                  theStack);
          if (messageChannel instanceof SIPTransaction) {
              // If the transaction has already been created
              // then set the transaction channel.
              retval.transactionChannel = (SIPTransaction) messageChannel;
          }
          retval.listeningPoint = messageChannel.getMessageProcessor()
                  .getListeningPoint();
          if (retval.listeningPoint == null)
              return null;
          if (sipStack.isLoggingEnabled())
              sipStack.getStackLogger().logDebug(
                      "Returning request interface for "
                              + sipRequest.getFirstLine() + " " + retval
                              + " messageChannel = " + messageChannel);
          return retval;
      }
  
      /**
       * Generate a new server response for the stack.
       * 
       * @param sipResponse
       *            is the SIPRequest from which the SIPServerRequest is to be
       *            constructed.
       * @param messageChannel
       *            is the MessageChannel abstraction for this SIPServerResponse
       */
      public ServerResponseInterface newSIPServerResponse(
              SIPResponse sipResponse, MessageChannel messageChannel) {
          SIPTransactionStack theStack = (SIPTransactionStack) messageChannel
                  .getSIPStack();
          // Tr is null if a transaction is not mapped.
          SIPTransaction tr = (SIPTransaction) ((SIPTransactionStack) theStack)
                  .findTransaction(sipResponse, false);
          if (sipStack.isLoggingEnabled())
              sipStack.getStackLogger().logDebug(
                      "Found Transaction " + tr + " for " + sipResponse);
  
          if (tr != null) {
              // Prune unhealthy responses early if handling statefully.
              // If the state has not yet been assigned then this is a
              // spurious response. This was moved up from the transaction
              // layer for efficiency.
              if (tr.getState() == null) {
                  if (sipStack.isLoggingEnabled())
                      sipStack.getStackLogger().logDebug(
                              "Dropping response - null transaction state");
                  return null;
                  // Ignore 1xx
              } else if (TransactionState.COMPLETED == tr.getState()
                      && sipResponse.getStatusCode() / 100 == 1) {
                  if (sipStack.isLoggingEnabled())
                      sipStack.getStackLogger().logDebug(
                              "Dropping response - late arriving "
                                      + sipResponse.getStatusCode());
                  return null;
              }
          }
  
          DialogFilter retval = new DialogFilter(
                  sipStack);
  
          retval.transactionChannel = tr;
  
          retval.listeningPoint = messageChannel.getMessageProcessor()
                  .getListeningPoint();
          return retval;
      }
  
      public NistSipMessageFactoryImpl(SipStackImpl sipStackImpl) {
          this.sipStack = sipStackImpl;
  
      }
  
  }