package org.jscsi.target.scsi.lun;
   
   
   import java.nio.ByteBuffer;
   
   import org.jscsi.target.scsi.IResponseData;
   import org.jscsi.target.util.ReadWrite;
   
   
  /**
   * Instances of this class are sent to the initiator in response to <code>REPORT LUNS</code> SCSI commands. They contain
   * a zero or more logical unit numbers (LUNs) that identify some or all of the target's logical units, depending on the
   * <code>REPORT
   * LUNS</code> parameters.
   * 
   * @author Andreas Ergenzinger
   */
  public final class ReportLunsParameterData implements IResponseData {
  
      /**
       * The length of the mandatory header fields in bytes.
       */
      private static final int HEADER_LENGTH = 8;
  
      /**
       * The length in bytes of the list of logical unit numbers.
       */
      private int lunListLength = 0;
  
      /**
       * LUNs identifying all reported logical units.
       */
      private LogicalUnitNumber[] luns;
  
      /**
       * The constructor.
       * 
       * @param luns the LUNs to report
       */
      public ReportLunsParameterData (LogicalUnitNumber... luns) {
          this.luns = luns;
          if (luns != null) lunListLength = LogicalUnitNumber.SIZE * luns.length;
      }
  
      public void serialize (ByteBuffer byteBuffer, int index) {
  
          // LUN list length
          ReadWrite.writeInt(lunListLength, byteBuffer, index);
  
          // LUN list
          int lunIndex = index + HEADER_LENGTH;
          for (int i = 0; i < luns.length; ++i) {
              luns[i].serialize(byteBuffer, lunIndex);
              lunIndex += luns[i].size();
          }
      }
  
      public int size () {
          return HEADER_LENGTH + lunListLength;
      }
  }