Mercurial > hg > blitz_stable
diff src/org/dancres/util/NumUtil.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/dancres/util/NumUtil.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,57 @@ +package org.dancres.util; + +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +/** + */ +public class NumUtil { + private static final String GB = "g"; + private static final String MB = "m"; + private static final String KB = "k"; + + public static long convertToBytes(String theDbCacheSizeValue) + throws IllegalArgumentException { + + String format = "\\d\\s*[" + GB + MB + KB + "]?"; + + // check format + // + Pattern pattern = Pattern.compile(format, Pattern.CASE_INSENSITIVE); + Matcher matcher = pattern.matcher(theDbCacheSizeValue); + if (!matcher.find()) + throw new IllegalArgumentException("Could not parse " + + theDbCacheSizeValue + + ". Should be of the form '0-9[k|m|g]'"); + + // grab the number piece + // + String splitOnUOM = "[kKmMgG]"; + String[] splitOnUOMArr = theDbCacheSizeValue.split(splitOnUOM); + long size = Long.parseLong(splitOnUOMArr[0].trim()); + + // grab the unit of measure piece + // + String uom = theDbCacheSizeValue.substring(splitOnUOMArr[0].length()); + if (uom.length() > 0) + uom = uom.substring(0, 1); + + // convert the size to bytes + // + long sizeInBytes = size; + if (KB.equalsIgnoreCase(uom)) + sizeInBytes = size * 1024; + else if (MB.equalsIgnoreCase(uom)) + sizeInBytes = size * 1024 * 1024; + else if (GB.equalsIgnoreCase(uom)) + sizeInBytes = size * 1024 * 1024 * 1024; + else + sizeInBytes = size; + + return sizeInBytes; + } + + public static void main(String anArgs[]) throws Exception { + System.out.println(convertToBytes(anArgs[0])); + } +}