java.text.NumberFormat#Style ( )源码实例Demo

/**
 * Returns the compact number format patterns.
 * @param formatStyle the style for formatting a number
 * @return an array of compact number patterns
 */
@SuppressWarnings("unchecked")
public String[] getCNPatterns(NumberFormat.Style formatStyle) {

    Objects.requireNonNull(formatStyle);
    String[] compactNumberPatterns = null;
    removeEmptyReferences();
    String width = (formatStyle == NumberFormat.Style.LONG) ? "long" : "short";
    String cacheKey = width + "." + COMPACT_NUMBER_PATTERNS_CACHEKEY;
    ResourceReference data = cache.get(cacheKey);
    if (data == null || ((compactNumberPatterns
            = (String[]) data.get()) == null)) {
        ResourceBundle resource = localeData.getNumberFormatData(locale);
        compactNumberPatterns = (String[]) resource
                .getObject(width + ".CompactNumberPatterns");
        cache.put(cacheKey, new ResourceReference(cacheKey,
                (Object) compactNumberPatterns, referenceQueue));
    }
    return compactNumberPatterns;
}
 

/**
 * Returns a new {@code NumberFormat} instance which formats
 * a number in its compact form for the specified
 * {@code locale} and {@code formatStyle}.
 *
 * @param locale the desired locale
 * @param formatStyle the style for formatting a number
 * @throws NullPointerException if {@code locale} or {@code formatStyle}
 *     is {@code null}
 * @throws IllegalArgumentException if {@code locale} isn't
 *     one of the locales returned from
 *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
 *     getAvailableLocales()}.
 * @return a compact number formatter
 *
 * @see java.text.NumberFormat#getCompactNumberInstance(Locale,
 *                      NumberFormat.Style)
 * @since 12
 */
@Override
public NumberFormat getCompactNumberInstance(Locale locale,
        NumberFormat.Style formatStyle) {

    Objects.requireNonNull(locale);
    Objects.requireNonNull(formatStyle);

    // Check for region override
    Locale override = locale.getUnicodeLocaleType("nu") == null
            ? CalendarDataUtility.findRegionOverride(locale)
            : locale;

    LocaleProviderAdapter adapter = LocaleProviderAdapter.forType(type);
    LocaleResources resource = adapter.getLocaleResources(override);

    String[] numberPatterns = resource.getNumberPatterns();
    DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(override);
    String[] cnPatterns = resource.getCNPatterns(formatStyle);

    // plural rules
    String pluralRules = rulesMap.getOrDefault(override.toString(),
            rulesMap.getOrDefault(override.getLanguage(), ""));

    CompactNumberFormat format = new CompactNumberFormat(numberPatterns[0],
            symbols, cnPatterns, pluralRules);
    return format;
}
 

@Override
public NumberFormat getCompactNumberInstance(Locale locale,
                        NumberFormat.Style style) {
    locale = CalendarDataUtility.findRegionOverride(locale);
    NumberFormatProvider nfp = getImpl(locale);
    return nfp.getCompactNumberInstance(locale, style);
}
 

/**
 * Returns a new {@code NumberFormat} instance which formats
 * a number in its compact form for the specified
 * {@code locale} and {@code formatStyle}.
 *
 * @implSpec The default implementation of this method throws
 * {@link java.lang.UnsupportedOperationException
 * UnsupportedOperationException}. Overriding the implementation
 * of this method returns the compact number formatter instance
 * of the given {@code locale} with specified {@code formatStyle}.
 *
 * @param locale the desired locale
 * @param formatStyle the style for formatting a number
 * @throws NullPointerException if {@code locale} or {@code formatStyle}
 *     is {@code null}
 * @throws IllegalArgumentException if {@code locale} is not
 *     one of the locales returned from
 *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
 *     getAvailableLocales()}.
 * @throws UnsupportedOperationException if the implementation does not
 *      support this method
 * @return a compact number formatter
 *
 * @see java.text.NumberFormat#getCompactNumberInstance(Locale,
 *                      NumberFormat.Style)
 * @since 12
 */
public NumberFormat getCompactNumberInstance(Locale locale,
        NumberFormat.Style formatStyle) {
    throw new UnsupportedOperationException(
            "The " + this.getClass().getName() + " should override this"
            + " method to return compact number format instance of "
            + locale + " locale and " + formatStyle + " style.");
}