package org.jscsi.target.connection.stage.fullfeature;

 import java.io.IOException;

 import java.security.DigestException;

 import org.jscsi.exception.InternetSCSIException;

 import org.jscsi.parser.BasicHeaderSegment;

 import org.jscsi.parser.InitiatorMessageParser;

 import org.jscsi.parser.ProtocolDataUnit;

 import org.jscsi.target.connection.phase.TargetFullFeaturePhase;

 import org.jscsi.target.scsi.cdb.ScsiOperationCode;

 import org.jscsi.target.scsi.sense.senseDataDescriptor.senseKeySpecific.FieldPointerSenseKeySpecificData;

 import org.jscsi.target.settings.SettingsException;

 /**

  * Unlike the other subclasses of {@link TargetFullFeatureStage}, this class is not associated with a single

  * {@link ScsiOperationCode}. All SCSI Command PDUs containing a SCSI OpCode not supported by the jSCSI Target (i.e.

  * without a dedicated FullFeatureStage to process them) shall be passed to the {@link #execute(ProtocolDataUnit)}

  * method of this class, which will dispatch a standard SCSI Response PDU stating that the given

  * {@link ScsiOperationCode} is not supported by this target.

  * 

  * @author Andreas Ergenzinger

  */

 public class UnsupportedOpCodeStage extends TargetFullFeatureStage {

     public UnsupportedOpCodeStage (TargetFullFeaturePhase targetFullFeaturePhase) {

         super(targetFullFeaturePhase);

     }

     @Override

     public void execute (ProtocolDataUnit pdu) throws IOException , InterruptedException , InternetSCSIException , DigestException , SettingsException {

         final BasicHeaderSegment bhs = pdu.getBasicHeaderSegment();

         final InitiatorMessageParser parser = (InitiatorMessageParser) bhs.getParser();

         // the SCSI OpCode is not supported, tell the initiator

         final FieldPointerSenseKeySpecificData fp = new FieldPointerSenseKeySpecificData(true,// senseKeySpecificDataValid

         true,// commandData (i.e. invalid field in CDB)

         false,// bitPointerValid

         0,// bitPointer, reserved since invalid

         0);// fieldPointer to the SCSI OpCode field

         final FieldPointerSenseKeySpecificData[] fpArray = new FieldPointerSenseKeySpecificData[] { fp };

         // If the parser is null..

         int essn = -1;

         if (parser != null) {

             essn = parser.getExpectedStatusSequenceNumber();

         }

         final ProtocolDataUnit responsePdu = createFixedFormatErrorPdu(fpArray,// senseKeySpecificData

                 bhs.getInitiatorTaskTag(),// initiatorTaskTag

                 essn);// expectedDataTransferLength

         // send response

         connection.sendPdu(responsePdu);

     }

 }