
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    distribution.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
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 * 5. Products derived from this software may not be called "Apache",
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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.poi.hssf.record.formula;

import java.util.List;

import org.apache.poi.hssf.model.Workbook;

/**
 * Unary Plus operator
 * does not have any effect on the operand
 * @author Avik Sengupta
 */

public class UnaryMinusPtg extends OperationPtg
{
    public final static int  SIZE = 1;
    public final static byte sid  = 0x13;
    
    private final static String MINUS = "-";

    /** Creates new AddPtg */

    public UnaryMinusPtg()
    {
    }

    public UnaryMinusPtg(byte[] data, int offset)
    {

        // doesn't need anything
    }
    
   
    public void writeBytes(byte [] array, int offset)
    {
        array[ offset + 0 ] = sid;
    }

    public int getSize()
    {
        return SIZE;
    }

    public int getType()
    {
        return this.TYPE_UNARY;
    }

    public int getNumberOfOperands()
    {
        return 1;
    }
    
    /** Implementation of method from Ptg */
    public String toFormulaString(Workbook book)
    {
        return "+";
    }
       
   /** implementation of method from OperationsPtg*/  
    public String toFormulaString(String[] operands) {
        StringBuffer buffer = new StringBuffer();
        buffer.append(MINUS);
        buffer.append(operands[ 0]);
        return buffer.toString();
    }
    
    public byte getDefaultOperandClass() {return Ptg.CLASS_VALUE;}
           
    public Object clone() {
      return new UnaryPlusPtg();
    }

}