Java Size toByte(String size)

Description

to Byte

License

Open Source License

Declaration

public static long toByte(String size) throws ParseException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.text.ParseException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static String[] units = { "B", "KB", "MB", "GB", "TB", "PB" };
    private static final Pattern SIZE_PATTERN = Pattern.compile("^(\\d+\\.)?(\\d+)([KkMmGgTtPp][Bb]?|[Bb])?$");

    public static long toByte(String size) throws ParseException {
        Matcher matcher = SIZE_PATTERN.matcher(size);
        if (!matcher.matches()) {
            throw new ParseException("Invalid size. Use 1024, 3.5M or 1gb", 0);
        }//from   www  . jav a  2s . c  om
        int factor = 1;
        if (matcher.group(3) != null) {
            String unit = matcher.group(3).toUpperCase();
            if (unit.length() == 1 && !unit.equals("B")) {
                unit += "B";
            }
            int i = 0;
            while (!units[i++].equals(unit)) {
                factor *= 1024;
            }
        }
        if (matcher.group(1) != null) {
            double d = Double.parseDouble(matcher.group(1) + matcher.group(2));
            return (long) (d * factor);
        } else {
            long n = Long.parseLong(matcher.group(2));
            return n * factor;
        }
    }
}

Related

1. renderNumber(int n, int size)
2. size(long l)
3. size2human(long size)
4. sizeRenderer(String value)
5. stringToSize(String sizeString)
6. toHumanReadableSize(final long pSizeInBytes)
7. toReadable(long size)