deltarecord.java

jxtl API Java中Excel的生成与导入解析参考文档

/*********************************************************************
*
*      Copyright (C) 2002 Andrew Khan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***************************************************************************/

package jxl.write.biff;

import jxl.biff.DoubleHelper;
import jxl.biff.Type;
import jxl.biff.WritableRecordData;

/**
 * Record which stores the maximum change value from the Options
 * dialog
 */
class DeltaRecord extends WritableRecordData
{
  /**
   * The binary data
   */
  private byte[] data;
  /**
   * The number of iterations
   */
  private double iterationValue;
  
  /**
   * Constructor
   * 
   * @param itval 
   */
  public DeltaRecord(double itval)
  {
    super(Type.DELTA);
    iterationValue = itval;

    data = new byte[8];
  }


  /**
   * Gets the binary data for writing to the output file
   * 
   * @return the binary data
   */
  public byte[] getData()
  {
    DoubleHelper.getIEEEBytes(iterationValue, data, 0);

    /*    long val = Double.doubleToLongBits(iterationValue);
    data[0] = (byte) (val & 0xff);
    data[1] = (byte) ((val & 0xff00) >> 8);
    data[2] = (byte) ((val & 0xff0000) >> 16);
    data[3] = (byte) ((val & 0xff000000) >> 24);
    data[4] = (byte) ((val & 0xff00000000L) >> 32);
    data[5] = (byte) ((val & 0xff0000000000L) >> 40);
    data[6] = (byte) ((val & 0xff000000000000L) >> 48);
    data[7] = (byte) ((val & 0xff00000000000000L) >> 56) ;
    */

    return data;
  }
}