Mercurial > hg > blitz_stable

comparison src/org/dancres/util/NumUtil.java @ 0:3dc0c5604566

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:3dc0c5604566
1 package org.dancres.util;
2
3 import java.util.regex.Matcher;
4 import java.util.regex.Pattern;
5
6 /**
7 */
8 public class NumUtil {
9 private static final String GB = "g";
10 private static final String MB = "m";
11 private static final String KB = "k";
12
13 public static long convertToBytes(String theDbCacheSizeValue)
14 throws IllegalArgumentException {
15
16 String format = "\\d\\s*[" + GB + MB + KB + "]?";
17
18 // check format
19 //
20 Pattern pattern = Pattern.compile(format, Pattern.CASE_INSENSITIVE);
21 Matcher matcher = pattern.matcher(theDbCacheSizeValue);
22 if (!matcher.find())
23 throw new IllegalArgumentException("Could not parse " +
24 theDbCacheSizeValue +
25 ". Should be of the form '0-9[k|m|g]'");
26
27 // grab the number piece
28 //
29 String splitOnUOM = "[kKmMgG]";
30 String[] splitOnUOMArr = theDbCacheSizeValue.split(splitOnUOM);
31 long size = Long.parseLong(splitOnUOMArr[0].trim());
32
33 // grab the unit of measure piece
34 //
35 String uom = theDbCacheSizeValue.substring(splitOnUOMArr[0].length());
36 if (uom.length() > 0)
37 uom = uom.substring(0, 1);
38
39 // convert the size to bytes
40 //
41 long sizeInBytes = size;
42 if (KB.equalsIgnoreCase(uom))
43 sizeInBytes = size * 1024;
44 else if (MB.equalsIgnoreCase(uom))
45 sizeInBytes = size * 1024 * 1024;
46 else if (GB.equalsIgnoreCase(uom))
47 sizeInBytes = size * 1024 * 1024 * 1024;
48 else
49 sizeInBytes = size;
50
51 return sizeInBytes;
52 }
53
54 public static void main(String anArgs[]) throws Exception {
55 System.out.println(convertToBytes(anArgs[0]));
56 }
57 }