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https://issues.apache.org/jira/browse/FREEMARKER-125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dániel Dékány closed FREEMARKER-125.
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> ExtendedDecimalFormatParser ignores DecimalFormatSymbolsProvider
> ----------------------------------------------------------------
>
> Key: FREEMARKER-125
> URL: https://issues.apache.org/jira/browse/FREEMARKER-125
> Project: Apache Freemarker
> Issue Type: Bug
> Components: engine
> Affects Versions: 2.3.28, 2.3.29
> Reporter: Adrian Schmid
> Priority: Major
> Fix For: 2.3.30
>
>
> We have customers that operate in multiple regions of Switzerland and use the
> locales de-CH, fr-CH and it-CH.
> The standard fr-CH number format changed when we upgraded from java 8 to java
> 11.
> old:
> 1'000.00 (single quote as thousands separator and dot as decimal separator)
> new:
> 1 000,00 (nonbreaking space as thousands separator and comma as decimal
> separator)
> To "fix" the issue we implemented a custom DecimalFormatSymbolsProvider to
> use the de-CH DecimalFormatSymbols for all swiss locales:
> {code:java}
> public class SwissDecimalFormatSymbolsProvider extends
> DecimalFormatSymbolsProvider {
> @Override
> public Locale[] getAvailableLocales() {
> return new Locale[] {
> Locale.forLanguageTag("de-CH"),
> Locale.forLanguageTag("fr-CH"),
> Locale.forLanguageTag("it-CH")
> };
> }
> @Override
> public DecimalFormatSymbols getInstance(Locale locale) {
> return new DecimalFormatSymbols(Locale.forLanguageTag("de-CH"));
> }
> }
> {code}
> This works everywhere as expected except for when people use a "custom"
> freemarker number format.
> E.g.
> number?currency -> 1'000.00 CHF (correct de-CH DecimalFormatSymbols)
> number?string(",##0.00") -> 1 000,00 (wrong fr-CH DecimalFormatSymbols)
> I looked at the source code of the constructor of ExtendedDecimalFormatParser
> and DecimalFormatSymbols are "retrieved" by using the constructor of the
> DecimalFormatSymbols class.
> {code:java}
> private ExtendedDecimalFormatParser(String formatString, Locale locale) {
> src = formatString;
> this.symbols = new DecimalFormatSymbols(locale);
> }
> {code}
> This initialises DecimalFormatSymbols for the current locale ("fr-CH")
> instead of applying DecimalFormatSymbolsProviders.
> {code:java}
> /**
> * Create a DecimalFormatSymbols object for the given locale.
> * This constructor can only construct instances for the locales
> * supported by the Java runtime environment, not for those
> * supported by installed
> * {@link java.text.spi.DecimalFormatSymbolsProvider
> DecimalFormatSymbolsProvider}
> * implementations. For full locale coverage, use the
> * {@link #getInstance(Locale) getInstance} method.
> * If the specified locale contains the {@link
> java.util.Locale#UNICODE_LOCALE_EXTENSION}
> * for the numbering system, the instance is initialized with the specified
> numbering
> * system if the JRE implementation supports it. For example,
> * <pre>
> * NumberFormat.getNumberInstance(Locale.forLanguageTag("th-TH-u-nu-thai"))
> * </pre>
> * This may return a {@code NumberFormat} instance with the Thai numbering
> system,
> * instead of the Latin numbering system.
> *
> * @param locale the desired locale
> * @exception NullPointerException if <code>locale</code> is null
> */
> public DecimalFormatSymbols( Locale locale ) {
> initialize( locale );
> }{code}
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