/*********************************************************************
*
*      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;

/**
 * A cell reference in a formula
 */
class UnaryMinus extends UnaryOperator implements ParsedThing
{
  /** 
   * Constructor
   */
  public UnaryMinus()
  {
  }

  public String getSymbol()
  {
    return "-";
  }

  /**
   * Abstract method which gets the token for this operator
   *
   * @return the string symbol for this token
   */
  Token getToken()
  {
    return Token.UNARY_MINUS;
  }

  /**
   * Gets the precedence for this operator.  Operator precedents run from 
   * 1 to 5, one being the highest, 5 being the lowest
   *
   * @return the operator precedence
   */
  int getPrecedence()
  {
    return 2;
  }

  /**
   * 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()
  {
  }
}
