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.ProtocolDataUnit;

 import org.jscsi.parser.scsi.SCSICommandParser;

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

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

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

 import org.jscsi.target.scsi.lun.ReportLunsParameterData;

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

 import org.jscsi.target.settings.SettingsException;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 /**

  * A stage for processing <code>REPORT LUNS</code> SCSI commands.

  * 

  * @author Andreas Ergenzinger

  */

 public class ReportLunsStage extends TargetFullFeatureStage {

     private static final Logger LOGGER = LoggerFactory.getLogger(ReportLunsStage.class);

     public ReportLunsStage (TargetFullFeaturePhase targetFullFeaturePhase) {

         super(targetFullFeaturePhase);

     }

     @Override

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

         final BasicHeaderSegment bhs = pdu.getBasicHeaderSegment();

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

         ProtocolDataUnit responsePdu = null;// the response PDU

         // get command details in CDB

         final ReportLunsCDB cdb = new ReportLunsCDB(parser.getCDB());

         final FieldPointerSenseKeySpecificData[] illegalFieldPointers = cdb.getIllegalFieldPointers();

         if (illegalFieldPointers != null) {

             // an illegal request has been made

             responsePdu = createFixedFormatErrorPdu(illegalFieldPointers,// senseKeySpecificData

                     bhs.getInitiatorTaskTag(),// initiatorTaskTag

                     parser.getExpectedDataTransferLength());// expectedDataTransferLength

             // send response

             connection.sendPdu(responsePdu);

         } else {

             // PDU is okay

             // carry out command

             final SelectReport selectReport = cdb.getSelectReport();

             LOGGER.debug("selectReport = " + selectReport);

             // there are only well known LUNs

             ReportLunsParameterData reportLunsParameterData;

             // TODO the switch isn't really needed right now, but maybe in

             // future implementations

             switch (selectReport) {

                 case SELECTED_ADDRESSING_METHODS :

                 case WELL_KNOWN_LUNS_ONLY :

                 case ALL :

                     reportLunsParameterData = new ReportLunsParameterData(session.getTargetServer().getConfig().getLogicalUnitNumber());

                     break;

                 default :

                     throw new InternetSCSIException();

                     /*

                      * Unreachable, this case has already been checked in the ReportLunsCDB constructor

                      */

             }

             // send response

             sendResponse(bhs.getInitiatorTaskTag(),// initiatorTaskTag

                     parser.getExpectedDataTransferLength(),// expectedDataTransferLength

                     reportLunsParameterData);// responseData

         }

     }

 }