public static ResolvedLocale fromLanguageTags()

in locales-common/src/main/java/com/spotify/i18n/locales/common/model/ResolvedLocale.java [75:109]
32 lines of code
1 McCabe index (conditional complexity)

  public static ResolvedLocale fromLanguageTags(
      final String languageTagForTranslations,
      final List<String> languageTagForTranslationsFallbacks,
      final String languageTagForFormatting) {
    Preconditions.checkNotNull(languageTagForTranslations, "Given input cannot be null");
    Preconditions.checkNotNull(languageTagForTranslationsFallbacks, "Given input cannot be null");
    Preconditions.checkNotNull(languageTagForFormatting, "Given input cannot be null");

    ULocale localeForTranslations = ULocale.forLanguageTag(languageTagForTranslations);
    ULocale localeForFormatting = ULocale.forLanguageTag(languageTagForFormatting);
    List<ULocale> localeForTranslationsFallbacks =
        languageTagForTranslationsFallbacks.stream()
            .map(ULocale::forLanguageTag)
            .collect(Collectors.toList());

    Preconditions.checkState(
        SupportedLocale.ALL_AVAILABLE_LOCALES.contains(localeForTranslations),
        "Given parameter languageTagForTranslations could not be matched with a locale available in CLDR: %s",
        languageTagForTranslations);
    Preconditions.checkState(
        localeForTranslationsFallbacks.stream()
            .allMatch(SupportedLocale.ALL_AVAILABLE_LOCALES::contains),
        "Given parameter languageTagForTranslationsFallbacks contains entries that could not be matched with a locale available in CLDR: %s",
        languageTagForTranslationsFallbacks);
    Preconditions.checkState(
        SupportedLocale.ALL_AVAILABLE_LOCALES.contains(localeForFormatting),
        "Given parameter languageTagForFormatting could not be matched with a locale available in CLDR: %s",
        languageTagForFormatting);

    return ResolvedLocale.builder()
        .localeForTranslations(localeForTranslations)
        .localeForTranslationsFallbacks(localeForTranslationsFallbacks)
        .localeForFormatting(localeForFormatting)
        .build();
  }