parenthesisptg.java

Office格式转换代码

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * 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.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 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
 *    derived from this software without prior written permission. For
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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
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 * 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;

/**
 * While formula tokens are stored in RPN order and thus do not need parenthesis for 
 * precedence reasons, Parenthesis tokens ARE written to ensure that user entered
 * parenthesis are displayed as-is on reading back
 *
 * Avik Sengupta <[e-mail]>
 * Andrew C. Oliver (acoliver at apache dot org)
 * @author Jason Height (jheight at chariot dot net dot au)
 */
public class ParenthesisPtg
    extends OperationPtg
{
   
    private final static int SIZE = 1;
    public final static byte sid  = 0x15;
   
    public ParenthesisPtg()
    {
    }

    public ParenthesisPtg(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 TYPE_BINARY;
    }

    public int getNumberOfOperands()
    {
        return 1;
    }

    public String toFormulaString(Workbook book)
    {
        return "()";
    }

          
    public String toFormulaString(String[] operands) {
        return "("+operands[0]+")";
    }  
    
    public byte getDefaultOperandClass() {return Ptg.CLASS_VALUE;}
        
    public Object clone() {
      return new ParenthesisPtg();
    }

}