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
  
          }
      }
  
  }