extendedsstrecord.java

来自「实现JAVA界面的代码GWT」· Java 代码 · 共 63 行

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   ExtendedSSTRecord.java

package jxl.write.biff;

import jxl.biff.*;

class ExtendedSSTRecord extends WritableRecordData
{

    private static final int infoRecordSize = 8;
    private int numberOfStrings;
    private int absoluteStreamPositions[];
    private int relativeStreamPositions[];
    private int currentStringIndex;

    public ExtendedSSTRecord(int newNumberOfStrings)
    {
        super(Type.EXTSST);
        currentStringIndex = 0;
        numberOfStrings = newNumberOfStrings;
        int numberOfBuckets = getNumberOfBuckets();
        absoluteStreamPositions = new int[numberOfBuckets];
        relativeStreamPositions = new int[numberOfBuckets];
        currentStringIndex = 0;
    }

    public int getNumberOfBuckets()
    {
        int numberOfStringsPerBucket = getNumberOfStringsPerBucket();
        return numberOfStringsPerBucket == 0 ? 0 : ((numberOfStrings + numberOfStringsPerBucket) - 1) / numberOfStringsPerBucket;
    }

    public int getNumberOfStringsPerBucket()
    {
        int bucketLimit = 128;
        return ((numberOfStrings + 128) - 1) / 128;
    }

    public void addString(int absoluteStreamPosition, int relativeStreamPosition)
    {
        absoluteStreamPositions[currentStringIndex] = absoluteStreamPosition + relativeStreamPosition;
        relativeStreamPositions[currentStringIndex] = relativeStreamPosition;
        currentStringIndex++;
    }

    public byte[] getData()
    {
        int numberOfBuckets = getNumberOfBuckets();
        byte data[] = new byte[2 + 8 * numberOfBuckets];
        IntegerHelper.getTwoBytes(getNumberOfStringsPerBucket(), data, 0);
        for(int i = 0; i < numberOfBuckets; i++)
        {
            IntegerHelper.getFourBytes(absoluteStreamPositions[i], data, 2 + i * 8);
            IntegerHelper.getTwoBytes(relativeStreamPositions[i], data, 6 + i * 8);
        }

        return data;
    }
}