numberptg.java

来自「EXCEL read and write」· Java 代码 · 共 71 行

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   this work for additional information regarding copyright ownership.
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   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.hssf.record.formula;

import org.apache.poi.hssf.record.RecordInputStream;
import org.apache.poi.util.LittleEndian;

/**
 * Number
 * Stores a floating point value in a formula
 * value stored in a 8 byte field using IEEE notation
 * @author  Avik Sengupta
 * @author Jason Height (jheight at chariot dot net dot au)
 */
public final class NumberPtg extends ScalarConstantPtg {
    public final static int  SIZE = 9;
    public final static byte sid  = 0x1f;
    private final double field_1_value;
        
    /** Create a NumberPtg from a byte array read from disk */
    public NumberPtg(RecordInputStream in) {
        this(in.readDouble());
    }
    
    /** Create a NumberPtg 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 NumberPtg(String value) {
        this(Double.parseDouble(value));
    }
    
    public NumberPtg(double value) {
        field_1_value = value;
    }
    
    public double getValue() {
        return field_1_value;
    }

    public void writeBytes(byte [] array, int offset) {
        array[ offset + 0 ] = sid;
        LittleEndian.putDouble(array, offset + 1, getValue());
    }

    public int getSize() {
        return SIZE;
    }

    public String toFormulaString() {
        // TODO - java's rendering of double values is not quite same as excel's
        return String.valueOf(field_1_value);
    }
}