integervalue.java

一个非常有用的操作MCRSOFT EXCEL文件的工具。可以用JAVA方便的新建

/*********************************************************************
*
*      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.biff.formula;

import common.Logger;

import jxl.Cell;
import jxl.biff.IntegerHelper;

/**
 * A cell reference in a formula
 */
class IntegerValue extends NumberValue implements ParsedThing
{
  /**
   * The logger
   */
  private static Logger logger = Logger.getLogger(IntegerValue.class);

  /**
   * The value of this integer
   */
  private double value;

  /**
   * Flag which indicates whether or not this integer is out range
   */
  private boolean outOfRange;

  /**
   * Constructor
   */
  public IntegerValue()
  {
    outOfRange = false;
  }

  /**
   * Constructor for an integer value being read from a string
   */
  public IntegerValue(String s)
  {
    try
    {
      value = Integer.parseInt(s);
    }
    catch (NumberFormatException e)
    {
      logger.warn(e, e);
      value = 0;
    }

    short v = (short) value;
    outOfRange = (value != v);
  }

  /** 
   * Reads the ptg data from the array starting at the specified position
   *
   * @param data the RPN array
   * @param pos the current position in the array, excluding the ptg identifier
   * @return the number of bytes read
   */
  public int read(byte[] data, int pos)
  {
    value = IntegerHelper.getInt(data[pos], data[pos+1]);

    return 2;
  }

  /**
   * Gets the token representation of this item in RPN
   *
   * @return the bytes applicable to this formula
   */
  byte[] getBytes()
  {
    byte[] data = new byte[3];
    data[0] = Token.INTEGER.getCode();

    IntegerHelper.getTwoBytes((int) value, data, 1);

    return data;
  }

  /**
   * Accessor for the value
   *
   * @return the value
   */
  public double getValue()
  {
    return value;
  }

  /**
   * Accessor for the out of range flag
   *
   * @return TRUE if the value is out of range for an excel integer
   */
  boolean isOutOfRange()
  {
    return outOfRange;
  }
}