com.yahoo.vespa.model.builder.xml.dom.BinaryUnit Maven / Gradle / Ivy
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.builder.xml.dom;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.yahoo.text.Lowercase.toLowerCase;
/**
* @author Tony Vaagenes
*/
public class BinaryUnit {
// The pattern must match the one given in the schema
private static final Pattern pattern = Pattern.compile("(\\d+(\\.\\d*)?)\\s*([kmgKMG])?");
public static double valueOf(String valueString) {
Matcher matcher = pattern.matcher(valueString);
if (!matcher.matches()) {
throw new IllegalArgumentException("Value '" + valueString + "' does not match the pattern for binary unit");
}
double value = Double.valueOf(matcher.group(1));
String unit = matcher.group(3);
if (unit != null) {
value *= unitToValue(toLowerCase(unit).charAt(0));
}
return value;
}
private static double unitToValue(char unit) {
char[] units = {'k', 'm', 'g'};
for (int i = 0; i < units.length; ++i) {
if (units[i] == unit) {
return Math.pow(2, 10*(i+1));
}
}
throw new IllegalArgumentException("No such unit: '" + unit + "'");
}
}