/*********************************************************************
*
* 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 java.util.Stack;
/**
* A cell reference in a formula
*/
abstract class BinaryOperator extends Operator implements ParsedThing
{
// The logger
private static final Logger logger = Logger.getLogger(BinaryOperator.class);
/**
* Constructor
*/
public BinaryOperator()
{
}
/**
* 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)
{
return 0;
}
/**
* Gets the operands for this operator from the stack
*
* @param s the token stack
*/
public void getOperands(Stack s)
{
ParseItem o1 = (ParseItem) s.pop();
ParseItem o2 = (ParseItem) s.pop();
add(o1);
add(o2);
}
/**
* Gets the string version of this binary operator
*
* @param buf a the string buffer
*/
public void getString(StringBuffer buf)
{
ParseItem[] operands = getOperands();
operands[1].getString(buf);
buf.append(getSymbol());
operands[0].getString(buf);
}
/**
* Adjusts all the relative cell references in this formula by the
* amount specified. Used when copying formulas
*
* @param colAdjust the amount to add on to each relative cell reference
* @param rowAdjust the amount to add on to each relative row reference
*/
public void adjustRelativeCellReferences(int colAdjust, int rowAdjust)
{
ParseItem[] operands = getOperands();
operands[1].adjustRelativeCellReferences(colAdjust, rowAdjust);
operands[0].adjustRelativeCellReferences(colAdjust, rowAdjust);
}
/**
* Called when a column is inserted on the specified sheet. Tells
* the formula parser to update all of its cell references beyond this
* column
*
* @param sheetIndex the sheet on which the column was inserted
* @param col the column number which was inserted
* @param currentSheet TRUE if this formula is on the sheet in which the
* column was inserted, FALSE otherwise
*/
void columnInserted(int sheetIndex, int col, boolean currentSheet)
{
ParseItem[] operands = getOperands();
operands[1].columnInserted(sheetIndex, col, currentSheet);
operands[0].columnInserted(sheetIndex, col, currentSheet);
}
/**
* Called when a column is inserted on the specified sheet. Tells
* the formula parser to update all of its cell references beyond this
* column
*
* @param sheetIndex the sheet on which the column was removed
* @param col the column number which was removed
* @param currentSheet TRUE if this formula is on the sheet in which the
* column was inserted, FALSE otherwise
*/
void columnRemoved(int sheetIndex, int col, boolean currentSheet)
{
ParseItem[] operands = getOperands();
operands[1].columnRemoved(sheetIndex, col, currentSheet);
operands[0].columnRemoved(sheetIndex, col, currentSheet);
}
/**
* Called when a column is inserted on the specified sheet. Tells
* the formula parser to update all of its cell references beyond this
* column
*
* @param sheetIndex the sheet on which the row was inserted
* @param row the row number which was inserted
* @param currentSheet TRUE if this formula is on the sheet in which the
* column was inserted, FALSE otherwise
*/
void rowInserted(int sheetIndex, int row, boolean currentSheet)
{
ParseItem[] operands = getOperands();
operands[1].rowInserted(sheetIndex, row, currentSheet);
operands[0].rowInserted(sheetIndex, row, currentSheet);
}
/**
* Called when a column is inserted on the specified sheet. Tells
* the formula parser to update all of its cell references beyond this
* column
*
* @param sheetIndex the sheet on which the row was removed
* @param row the row number which was removed
* @param currentSheet TRUE if this formula is on the sheet in which the
* column was inserted, FALSE otherwise
*/
void rowRemoved(int sheetIndex, int row, boolean currentSheet)
{
ParseItem[] operands = getOperands();
operands[1].rowRemoved(sheetIndex, row, currentSheet);
operands[0].rowRemoved(sheetIndex, row, currentSheet);
}
/**
* Gets the token representation of this item in RPN
*
* @return the bytes applicable to this formula
*/
byte[] getBytes()
{
// Get the data for the operands
ParseItem[] operands = getOperands();
byte[] data = new byte[0];
// Get the operands in reverse order to get the RPN
for (int i = operands.length - 1; i >= 0; i--)
{
byte[] opdata = operands[i].getBytes();
// Grow the array
byte[] newdata = new byte[data.length + opdata.length];
System.arraycopy(data, 0, newdata, 0, data.length);
System.arraycopy(opdata, 0, newdata, data.length, opdata.length);
data = newdata;
}
// Add on the operator byte
byte[] newdata = new byte[data.length + 1];
System.arraycopy(data, 0, newdata, 0, data.length);
newdata[data.length] = getToken().getCode();
return newdata;
}
/**
* Abstract method which gets the binary operator string symbol
*
* @return the string symbol for this token
*/
abstract String getSymbol();
/**
* Abstract method which gets the token for this operator
*
* @return the string symbol for this token
*/
abstract Token getToken();
/**
* If this formula was on an imported sheet, check that
* cell references to another sheet are warned appropriately
* Does nothing, as operators don't have cell references
*/
void handleImportedCellReferences()
{
ParseItem[] operands = getOperands();
operands[0].handleImportedCellReferences();
operands[1].handleImportedCellReferences();
}
}
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