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);
      }
  
  }