package org.jscsi.target.scsi.modeSense;

 import java.nio.ByteBuffer;

 import org.jscsi.target.util.ReadWrite;

 /**

  * Instances of this class represent MODE PAGEs using the SUB-PAGE format.

  * 

  * @author Andreas Ergenzinger

  */

 public abstract class SubPageFormatModePage extends ModePage {

     /**

      * The index of the SUB-PAGE CODE field in the serialized representation of a MODE PAGE using the SUB-PAGE format.

      */

     private static final int SUB_PAGE_CODE_INDEX = 1;

     /**

      * The index of the PAGE LENGTH field in the serialized representation of a MODE PAGE using the SUB-PAGE format.

      */

     private static final int PAGE_LENGTH_INDEX = 2;

     /**

      * Together with {@link ModePage#pageCode} this value determines the kind of information contained in the MODE PAGE.

      */

     private final int subPageCode;

     /**

      * The abstract constructor.

      * 

      * @param parametersSaveable value of the PARAMETERS SAVEABLE bit

      * @param pageCode general description of the contained information

      * @param subPageCode more specific description of the contained information

      * @param pageLength the value of the PAGE LENGTH field

      */

     public SubPageFormatModePage (boolean parametersSaveable, int pageCode, final int subPageCode, int pageLength) {

         super(parametersSaveable, true,// subPageFormat

         pageCode, pageLength);

         this.subPageCode = subPageCode;

     }

     @Override

     protected final void serializeSubPageCode (final ByteBuffer buffer, final int index) {

         buffer.position(index + SUB_PAGE_CODE_INDEX);

         buffer.put((byte) subPageCode);

     }

     @Override

     protected final void serializePageLength (ByteBuffer buffer, int index) {

         buffer.position(index + PAGE_LENGTH_INDEX);

         ReadWrite.writeTwoByteInt(buffer,// buffer

                 pageLength,// value

                 index + PAGE_LENGTH_INDEX);// index

     }

 }