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annotate src/org/dancres/util/NumUtil.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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1 package org.dancres.util;
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2
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3 import java.util.regex.Matcher;
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4 import java.util.regex.Pattern;
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5
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6 /**
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7 */
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8 public class NumUtil {
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9 private static final String GB = "g";
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10 private static final String MB = "m";
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11 private static final String KB = "k";
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12
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13 public static long convertToBytes(String theDbCacheSizeValue)
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14 throws IllegalArgumentException {
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15
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16 String format = "\\d\\s*[" + GB + MB + KB + "]?";
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17
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18 // check format
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19 //
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20 Pattern pattern = Pattern.compile(format, Pattern.CASE_INSENSITIVE);
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21 Matcher matcher = pattern.matcher(theDbCacheSizeValue);
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22 if (!matcher.find())
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23 throw new IllegalArgumentException("Could not parse " +
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24 theDbCacheSizeValue +
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25 ". Should be of the form '0-9[k|m|g]'");
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26
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27 // grab the number piece
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28 //
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29 String splitOnUOM = "[kKmMgG]";
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30 String[] splitOnUOMArr = theDbCacheSizeValue.split(splitOnUOM);
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31 long size = Long.parseLong(splitOnUOMArr[0].trim());
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32
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33 // grab the unit of measure piece
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34 //
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35 String uom = theDbCacheSizeValue.substring(splitOnUOMArr[0].length());
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36 if (uom.length() > 0)
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37 uom = uom.substring(0, 1);
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38
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39 // convert the size to bytes
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40 //
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41 long sizeInBytes = size;
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42 if (KB.equalsIgnoreCase(uom))
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43 sizeInBytes = size * 1024;
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44 else if (MB.equalsIgnoreCase(uom))
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45 sizeInBytes = size * 1024 * 1024;
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46 else if (GB.equalsIgnoreCase(uom))
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47 sizeInBytes = size * 1024 * 1024 * 1024;
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48 else
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49 sizeInBytes = size;
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50
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51 return sizeInBytes;
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52 }
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53
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54 public static void main(String anArgs[]) throws Exception {
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55 System.out.println(convertToBytes(anArgs[0]));
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56 }
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57 }