/*********************************************************************
*
* 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 jxl.common.Logger;
import jxl.Cell;
import jxl.biff.CellReferenceHelper;
import jxl.biff.IntegerHelper;
/**
* A cell reference in a formula
*/
class SharedFormulaCellReference extends Operand implements ParsedThing
{
// The logger
private static Logger logger =
Logger.getLogger(SharedFormulaCellReference.class);
/**
* Indicates whether the column reference is relative or absolute
*/
private boolean columnRelative;
/**
* Indicates whether the row reference is relative or absolute
*/
private boolean rowRelative;
/**
* The column reference
*/
private int column;
/**
* The row reference
*/
private int row;
/**
* The cell containing the formula. Stored in order to determine
* relative cell values
*/
private Cell relativeTo;
/**
* Constructor
*
* @param the cell the formula is relative to
*/
public SharedFormulaCellReference(Cell rt)
{
relativeTo = rt;
}
/**
* 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)
{
// Preserve signage on column and row values, because they will
// probably be relative
row = IntegerHelper.getShort(data[pos], data[pos+1]);
int columnMask = IntegerHelper.getInt(data[pos+2], data[pos+3]);
column = (byte) (columnMask & 0xff);
columnRelative = ((columnMask & 0x4000) != 0);
rowRelative = ((columnMask & 0x8000) != 0);
if (columnRelative && relativeTo != null)
{
column = relativeTo.getColumn() + column;
}
if (rowRelative && relativeTo != null)
{
row = relativeTo.getRow() + row;
}
return 4;
}
public int getColumn()
{
return column;
}
public int getRow()
{
return row;
}
public void getString(StringBuffer buf)
{
CellReferenceHelper.getCellReference(column, row, buf);
}
/**
* Gets the token representation of this item in RPN
*
* @return the bytes applicable to this formula
*/
byte[] getBytes()
{
byte[] data = new byte[5];
data[0] = Token.REF.getCode();
IntegerHelper.getTwoBytes(row, data, 1);
int columnMask = column;
if (columnRelative)
{
columnMask |= 0x4000;
}
if (rowRelative)
{
columnMask |= 0x8000;
}
IntegerHelper.getTwoBytes(columnMask, data, 3);
return data;
}
/**
* If this formula was on an imported sheet, check that
* cell references to another sheet are warned appropriately
* Does nothing
*/
void handleImportedCellReferences()
{
}
}
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