bofrecord.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.read.biff;

import common.Logger;

import jxl.biff.IntegerHelper;
import jxl.biff.RecordData;

/**
 * A Beginning Of File record, found at the commencement of all substreams
 * within a biff8 file
 */
public class BOFRecord extends RecordData
{
  /**
   * The logger
   */
  private static Logger logger = Logger.getLogger(BOFRecord.class);

  /**
   * The code used for biff8 files
   */
  private static final int Biff8 = 0x600;
  /**
   * The code used for biff8 files
   */
  private static final int Biff7 = 0x500;
  /**
   * The code used for workbook globals
   */
  private static final int WorkbookGlobals = 0x5;
  /**
   * The code used for worksheets
   */
  private static final int Worksheet = 0x10;
  /**
   * The code used for charts
   */
  private static final int Chart = 0x20;
  /**
   * The code used for macro sheets
   */
  private static final int MacroSheet = 0x40;

  /**
   * The biff version of this substream
   */
  private int version;
  /**
   * The type of this substream
   */
  private int substreamType;

  /**
   * Constructs this object from the raw data
   *
   * @param t the raw data
   */
  BOFRecord(Record t)
  {
    super(t);
    byte[] data = getRecord().getData();
    version = IntegerHelper.getInt(data[0], data[1]);
    substreamType = IntegerHelper.getInt(data[2], data[3]);
  }

  /**
   * Interrogates this object to see if it is a biff8 substream
   *
   * @return TRUE if this substream is biff8, false otherwise
   */
  public boolean isBiff8()
  {
    return version == Biff8;
  }

  /**
   * Interrogates this object to see if it is a biff7 substream
   *
   * @return TRUE if this substream is biff7, false otherwise
   */
  public boolean isBiff7()
  {
    return version == Biff7;
  }


  /**
   * Interrogates this substream to see if it represents the commencement of
   * the workbook globals substream
   *
   * @return TRUE if this is the commencement of a workbook globals substream,
   *      FALSE otherwise
   */
  boolean isWorkbookGlobals()
  {
    return substreamType == WorkbookGlobals;
  }

  /**
   * Interrogates the substream to see if it is the commencement of a worksheet
   *
   * @return TRUE if this substream is the beginning of a worksheet, FALSE
   *     otherwise
   */
  public boolean isWorksheet()
  {
    return substreamType == Worksheet;
  }

  /**
   * Interrogates the substream to see if it is the commencement of a worksheet
   *
   * @return TRUE if this substream is the beginning of a worksheet, FALSE
   *     otherwise
   */
  public boolean isMacroSheet()
  {
    return substreamType == MacroSheet;
  }

  /**
   * Interrogates the substream to see if it is a chart
   *
   * @return TRUE if this substream is the beginning of a worksheet, FALSE
   *     otherwise
   */
  public boolean isChart()
  {
    return substreamType == Chart;
  }

  /**
   * Gets the length of the data portion of this record
   * Used to adjust when reading sheets which contain just a chart
   * @return the length of the data portion of this record
   */
  int getLength()
  {
    return getRecord().getLength();
  }

}