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There is a newer version: 20.0.8
///////////////////////////////////////////////////////////////////////////////
//                                                                             
// JTOpen (IBM Toolbox for Java - OSS version)                              
//                                                                             
// Filename: ClassDecoupler.java
//                                                                             
// The source code contained herein is licensed under the IBM Public License   
// Version 1.0, which has been approved by the Open Source Initiative.         
// Copyright (C) 1997-2004 International Business Machines Corporation and     
// others. All rights reserved.                                                
//                                                                             
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.access;

import java.io.*;
import java.util.*;

/**
 * This class exists to remove the dependencies AS400ImplRemote had on some of
 * the DDM and DB datastream classes.  In this way, a JarMaker-ed jt400.jar file
 * can effectively operate its AS400 object without needing the DDM or JDBC classes.
**/
class ClassDecoupler
{
// For future use.
//    static
//    {
//        // Identify all DDM server reply data streams.
//        AS400Server.addReplyStream(new DDMEXCSATReplyDataStream(), AS400.RECORDACCESS);
//        AS400Server.addReplyStream(new DDMACCSECReplyDataStream(), AS400.RECORDACCESS);
//        AS400Server.addReplyStream(new DDMSECCHKReplyDataStream(), AS400.RECORDACCESS);
//        AS400Server.addReplyStream(new DDMASPReplyDataStream(), AS400.RECORDACCESS);
//    }

  static void freeDBReplyStream(DataStream ds)
  {
    if (ds instanceof DBReplyRequestedDS)
    {
      ((DBReplyRequestedDS)ds).returnToPool();
    }
  }

  static Object[] connectDDMPhase1(OutputStream outStream, InputStream inStream, boolean passwordType_, int byteType_, int connectionID) throws ServerStartupException, IOException
  {
    // Exchange server start up/security information with DDM server.
    // Exchange attributes.
    DDMEXCSATRequestDataStream EXCSATRequest = new DDMEXCSATRequestDataStream();
    if (Trace.traceOn_) EXCSATRequest.setConnectionID(connectionID);
    EXCSATRequest.write(outStream);

    DDMEXCSATReplyDataStream EXCSATReply = new DDMEXCSATReplyDataStream();
    if (Trace.traceOn_) EXCSATReply.setConnectionID(connectionID);
    EXCSATReply.read(inStream);

    if (!EXCSATReply.checkReply())
    {
        throw new ServerStartupException(ServerStartupException.CONNECTION_NOT_ESTABLISHED);
    }
    byte[] jobString = EXCSATReply.getEXTNAM();
    if (Trace.traceOn_) Trace.log(Trace.DIAGNOSTIC, "DDM EXCSAT successful.");

    DDMACCSECRequestDataStream ACCSECReq = new DDMACCSECRequestDataStream(passwordType_, byteType_, null); // We currently don't need to pass the IASP to the ACCSEC, but may in the future.
    if (Trace.traceOn_) ACCSECReq.setConnectionID(connectionID);
    ACCSECReq.write(outStream);

    DDMACCSECReplyDataStream ACCSECRep = new DDMACCSECReplyDataStream();
    if (Trace.traceOn_) ACCSECRep.setConnectionID(connectionID);
    ACCSECRep.read(inStream);

    if (!ACCSECRep.checkReply(byteType_))
    {
        throw new ServerStartupException(ServerStartupException.CONNECTION_NOT_ESTABLISHED);
    }
    if (Trace.traceOn_) Trace.log(Trace.DIAGNOSTIC, "DDM ACCSEC successful.");

    // Seeds for substitute password generation.
    byte[] clientSeed = null;
    byte[] serverSeed = null;
    if (byteType_ == AS400.AUTHENTICATION_SCHEME_PASSWORD)
    {
        clientSeed = ACCSECReq.getClientSeed();
        serverSeed = ACCSECRep.getServerSeed();
    }
    return new Object[] { clientSeed, serverSeed, jobString };
  }

  static void connectDDMPhase2(OutputStream outStream, InputStream inStream, byte[] userIDbytes, byte[] ddmSubstitutePassword, byte[] iaspBytes, int byteType_, String ddmRDB_, String systemName_, int connectionID) throws ServerStartupException, IOException
  {
    // If the ddmSubstitutePassword length is 8, then we are using DES encryption.  If its length is 20, then we are using SHA encryption.
    // Build the SECCHK request; we build the request here so that we are not passing the password around anymore than we have to.
    DDMSECCHKRequestDataStream SECCHKReq = new DDMSECCHKRequestDataStream(userIDbytes, ddmSubstitutePassword, iaspBytes, byteType_);
    if (Trace.traceOn_) SECCHKReq.setConnectionID(connectionID);

    // Send the SECCHK request.
    SECCHKReq.write(outStream);

    DDMSECCHKReplyDataStream SECCHKRep = new DDMSECCHKReplyDataStream();
    if (Trace.traceOn_) SECCHKRep.setConnectionID(connectionID);
    SECCHKRep.read(inStream);

    // Validate the reply.
    if (!SECCHKRep.checkReply())
    {
        throw new ServerStartupException(ServerStartupException.CONNECTION_NOT_ESTABLISHED);
    }
    if (Trace.traceOn_) Trace.log(Trace.DIAGNOSTIC, "DDM SECCHK successful.");
    if (iaspBytes != null)
    {
      // We need to send an RDB datastream to make sure the RDB name we sent on the SECCHK is a valid RDB.
      DDMASPRequestDataStream aspReq = new DDMASPRequestDataStream(iaspBytes);
      if (Trace.traceOn_) aspReq.setConnectionID(connectionID);
      aspReq.write(outStream);
      DDMASPReplyDataStream aspRep = new DDMASPReplyDataStream();
      if (Trace.traceOn_) aspRep.setConnectionID(connectionID);
      aspRep.read(inStream);
      if (!aspRep.checkReply())
      {
        if (Trace.traceOn_) Trace.log(Trace.ERROR, "RDB name '"+ddmRDB_+"' is not a valid IASP name on system '"+systemName_+"'.");
        throw new ServerStartupException(ServerStartupException.CONNECTION_NOT_ESTABLISHED);
      }
      if (Trace.traceOn_) Trace.log(Trace.DIAGNOSTIC, "DDM RDB name '"+ddmRDB_+"' verified.");
    }
  }

  static DataStream constructDDMDataStream(InputStream inStream, Hashtable replyStreams, AS400ImplRemote system, int connectionID) throws IOException
  {
    return DDMDataStream.construct(inStream, replyStreams, system, connectionID);
  }
}