com.github.andyshao.lang.ByteLongWrapper Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of Gear Show documentation

Enhance and formating the coding of JDK

The newest version!

package com.github.andyshao.lang;

import java.math.BigInteger;

/**
 * 
 * Title:

 * Descript:

 * Copyright: Copryright(c) Apr 5, 2015

 * Encoding:UNIX UTF-8
 * 
 * @author Andy.Shao
 *
 */
public class ByteLongWrapper implements LongWrapper {
    private static final int BASE = 3;

    @Override
    public long getLong(byte[] array , BigInteger position) {
        long result = 0x00;
        for (int i = 0 , index = position.intValue() << ByteLongWrapper.BASE ; i < 8 ; i++ , index++)
            if (index < array.length) result = LongOperation.setByte(result , index , array[index]);
            else if (i == 0) throw new ArrayIndexOutOfBoundsException(index);
            else break;
        return result;
    }

    @Override
    public void setLong(byte[] array , BigInteger position , long l) {
        for (int i = 0 , index = position.intValue() << ByteLongWrapper.BASE ; i < 8 ; i++ , index++)
            if (index < array.length) array[index] = LongOperation.getByte(l , i);
            else if (i == 0) throw new ArrayIndexOutOfBoundsException(index);
            else break;
    }

    @Override
    public BigInteger size(byte[] array) {
        return array.length - (array.length >> ByteLongWrapper.BASE) > 0 ? BigInteger.valueOf((array.length >> ByteLongWrapper.BASE) + 1) : BigInteger.valueOf(array.length >> ByteLongWrapper.BASE);
    }

}