/*********************************************************************
*
* 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.Cell;
import jxl.biff.CellReferenceHelper;
import jxl.biff.IntegerHelper;
/**
* A cell reference in a formula
*/
class SharedFormulaArea extends Operand implements ParsedThing
{
private int columnFirst;
private int rowFirst;
private int columnLast;
private int rowLast;
private boolean columnFirstRelative;
private boolean rowFirstRelative;
private boolean columnLastRelative;
private boolean rowLastRelative;
/**
* 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 SharedFormulaArea(Cell rt)
{
relativeTo = rt;
}
int getFirstColumn()
{
return columnFirst;
}
int getFirstRow()
{
return rowFirst;
}
int getLastColumn()
{
return columnLast;
}
int getLastRow()
{
return rowLast;
}
/**
* 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
rowFirst = IntegerHelper.getShort(data[pos], data[pos+1]);
rowLast = IntegerHelper.getShort(data[pos+2], data[pos+3]);
int columnMask = IntegerHelper.getInt(data[pos+4], data[pos+5]);
columnFirst = columnMask & 0x00ff;
columnFirstRelative = ((columnMask & 0x4000) != 0);
rowFirstRelative = ((columnMask & 0x8000) != 0);
if (columnFirstRelative)
{
columnFirst = relativeTo.getColumn() + columnFirst;
}
if (rowFirstRelative)
{
rowFirst = relativeTo.getRow() + rowFirst;
}
columnMask = IntegerHelper.getInt(data[pos+6], data[pos+7]);
columnLast = columnMask & 0x00ff;
columnLastRelative = ((columnMask & 0x4000) != 0);
rowLastRelative = ((columnMask & 0x8000) != 0);
if (columnLastRelative)
{
columnLast = relativeTo.getColumn() + columnLast;
}
if (rowLastRelative)
{
rowLast = relativeTo.getRow() + rowLast;
}
return 8;
}
public void getString(StringBuffer buf)
{
CellReferenceHelper.getCellReference(columnFirst, rowFirst, buf);
buf.append(':');
CellReferenceHelper.getCellReference(columnLast, rowLast, buf);
}
/**
* Gets the token representation of this item in RPN
*
* @return the bytes applicable to this formula
*/
byte[] getBytes()
{
byte[] data = new byte[9];
data[0] = Token.AREA.getCode();
// Use absolute references for columns, so don't bother about
// the col relative/row relative bits
IntegerHelper.getTwoBytes(rowFirst, data, 1);
IntegerHelper.getTwoBytes(rowLast, data, 3);
IntegerHelper.getTwoBytes(columnFirst, data, 5);
IntegerHelper.getTwoBytes(columnLast, data, 7);
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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