stringptg.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
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 *
 * 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
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 *    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.
 *
 * 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
 * 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 org.apache.poi.util.LittleEndian;
import org.apache.poi.util.BitField;
import org.apache.poi.hssf.model.Workbook;
import org.apache.poi.util.StringUtil;

/**
 * Number
 * Stores a String value in a formula value stored in the format <length 2 bytes>char[]
 * @author  Werner Froidevaux
 * @author Jason Height (jheight at chariot dot net dot au)
 */

public class StringPtg
    extends Ptg
{
    public final static int  SIZE = 9;
    public final static byte sid  = 0x17;
    //NOTE: OO doc says 16bit lenght, but BiffViewer says 8
    // Book says something totally different, so dont look there!
    byte field_1_length;
    byte field_2_options;
    BitField fHighByte = new BitField(0x01);
    private String            field_3_string;

    private StringPtg() {
      //Required for clone methods
    }

    /** Create a StringPtg from a byte array read from disk */
    public StringPtg(byte [] data, int offset)
    {
        offset++;
        field_1_length = data[offset];
        field_2_options = data[offset+1];
        if (fHighByte.isSet(field_2_options)) {
            field_3_string= StringUtil.getFromUnicode(data,offset+2,field_1_length);
        }else {
            field_3_string=StringUtil.getFromCompressedUnicode(data,offset+2,field_1_length);
        }
				 
        //setValue(new String(data, offset+3, data[offset+1] + 256*data[offset+2]));
    }

    /** Create a StringPtg from a string representation of  the number
     *  Number format is not checked, it is expected to be validated in the parser
     *   that calls this method.
     *  @param value : String representation of a floating point number
     */
    public StringPtg(String value) {
        if (value.length() >255) {
            throw new IllegalArgumentException("String literals in formulas cant be bigger than 255 characters ASCII");
        }
        this.field_2_options=0;
        this.fHighByte.setBoolean(field_2_options, false);
        this.field_3_string=value;
        this.field_1_length=(byte)value.length(); //for the moment, we support only ASCII strings in formulas we create
    }

    /*
    public void setValue(String value)
    {
        field_1_value = value;
    }*/


    public String getValue()
    {
        return field_3_string;
    }

    public void writeBytes(byte [] array, int offset)
    {
        array[ offset + 0 ] = sid;
        array[ offset + 1 ] = field_1_length;
        array[ offset + 2 ] = field_2_options;
        if (fHighByte.isSet(field_2_options)) {
            StringUtil.putUncompressedUnicode(getValue(),array,offset+3);
        }else {
            StringUtil.putCompressedUnicode(getValue(),array,offset+3);
        }
    }

    public int getSize()
    {
        if (fHighByte.isSet(field_2_options)) {
            return 2*field_1_length+3;
        }else {
            return field_1_length+3;
        }
    }

    public String toFormulaString(Workbook book)
    {
        return "\""+getValue()+"\"";
    }
    public byte getDefaultOperandClass() {
       return Ptg.CLASS_VALUE;
   }

   public Object clone() {
     StringPtg ptg = new StringPtg();
     ptg.field_1_length = field_1_length;
     ptg.field_2_options=field_2_options;
     ptg.field_3_string=field_3_string;
     return ptg;
   }

}