[
https://issues.apache.org/jira/browse/LANG-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Benedikt Ritter updated LANG-1109:
----------------------------------
Description:
Java built-in number formatter does formats Number locale aware with fractional
digits defined by the defined scale of the Number, aswell the required
precision (trims trailing zeros).
For some reason Java's built-in percentage number formatter does not formats
fractional digits. So i wrote a function which has same behavior as the Java
built-in number formatter but with percentage formatting.
{code:java}
/**
* Formats the given Number as percentage with necessary precision.
* This serves as a workaround for {@link
NumberFormat#getPercentInstance()} which does not renders fractional
* digits.
*
* @param number
* @param locale
*
* @return
*/
public static String formatPercentFraction(final Number number, final
Locale locale)
{
if (number == null)
return null;
// get string representation with dot
final String strNumber =
NumberFormat.getNumberInstance(Locale.US).format(number.doubleValue());
// create exact BigDecimal and convert to get scale
final BigDecimal dNumber = new
BigDecimal(strNumber).multiply(new BigDecimal(100));
final NumberFormat percentScaleFormat =
NumberFormat.getPercentInstance(locale);
percentScaleFormat.setMaximumFractionDigits(Math.max(0,
dNumber.scale()));
// convert back for locale percent formatter
return percentScaleFormat.format(dNumber.multiply(new
BigDecimal(0.01)));
}
{code}
I also unit tested it with many inputs.
was:
Java built-in number formatter does formats Number locale aware with fractional
digits defined by the defined scale of the Number, aswell the required
precision (trims trailing zeros).
For some reason Java's built-in percentage number formatter does not formats
fractional digits. So i wrote a function which has same behavior as the Java
built-in number formatter but with percentage formatting.
/**
* Formats the given Number as percentage with necessary precision.
* This serves as a workaround for {@link
NumberFormat#getPercentInstance()} which does not renders fractional
* digits.
*
* @param number
* @param locale
*
* @return
*/
public static String formatPercentFraction(final Number number, final
Locale locale)
{
if (number == null)
return null;
// get string representation with dot
final String strNumber =
NumberFormat.getNumberInstance(Locale.US).format(number.doubleValue());
// create exact BigDecimal and convert to get scale
final BigDecimal dNumber = new
BigDecimal(strNumber).multiply(new BigDecimal(100));
final NumberFormat percentScaleFormat =
NumberFormat.getPercentInstance(locale);
percentScaleFormat.setMaximumFractionDigits(Math.max(0,
dNumber.scale()));
// convert back for locale percent formatter
return percentScaleFormat.format(dNumber.multiply(new
BigDecimal(0.01)));
}
I also unit tested it with many inputs.
> Number percentage formatting with fractional digits
> ---------------------------------------------------
>
> Key: LANG-1109
> URL: https://issues.apache.org/jira/browse/LANG-1109
> Project: Commons Lang
> Issue Type: New Feature
> Components: lang.*
> Reporter: Marco Janc
> Fix For: Review Patch
>
>
> Java built-in number formatter does formats Number locale aware with
> fractional digits defined by the defined scale of the Number, aswell the
> required precision (trims trailing zeros).
> For some reason Java's built-in percentage number formatter does not formats
> fractional digits. So i wrote a function which has same behavior as the Java
> built-in number formatter but with percentage formatting.
> {code:java}
> /**
> * Formats the given Number as percentage with necessary precision.
> * This serves as a workaround for {@link
> NumberFormat#getPercentInstance()} which does not renders fractional
> * digits.
> *
> * @param number
> * @param locale
> *
> * @return
> */
> public static String formatPercentFraction(final Number number, final
> Locale locale)
> {
> if (number == null)
> return null;
> // get string representation with dot
> final String strNumber =
> NumberFormat.getNumberInstance(Locale.US).format(number.doubleValue());
> // create exact BigDecimal and convert to get scale
> final BigDecimal dNumber = new
> BigDecimal(strNumber).multiply(new BigDecimal(100));
> final NumberFormat percentScaleFormat =
> NumberFormat.getPercentInstance(locale);
> percentScaleFormat.setMaximumFractionDigits(Math.max(0,
> dNumber.scale()));
> // convert back for locale percent formatter
> return percentScaleFormat.format(dNumber.multiply(new
> BigDecimal(0.01)));
> }
> {code}
> I also unit tested it with many inputs.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
