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MVC framework based on LibGDX using Autumn for components management and LML as view templates.
There is a newer version: 1.9.1.9.6
package com.github.czyzby.autumn.mvc.component.i18n;

import java.util.Locale;

import com.badlogic.gdx.Preferences;
import com.badlogic.gdx.utils.GdxRuntimeException;
import com.badlogic.gdx.utils.I18NBundle;
import com.badlogic.gdx.utils.reflect.Field;
import com.badlogic.gdx.utils.reflect.ReflectionException;
import com.github.czyzby.autumn.annotation.Inject;
import com.github.czyzby.autumn.context.Context;
import com.github.czyzby.autumn.context.ContextDestroyer;
import com.github.czyzby.autumn.context.ContextInitializer;
import com.github.czyzby.autumn.mvc.component.ui.InterfaceService;
import com.github.czyzby.autumn.mvc.stereotype.preference.I18nLocale;
import com.github.czyzby.autumn.processor.AbstractAnnotationProcessor;
import com.github.czyzby.kiwi.util.common.Strings;
import com.github.czyzby.kiwi.util.gdx.asset.lazy.provider.ObjectProvider;
import com.github.czyzby.kiwi.util.gdx.preference.ApplicationPreferences;
import com.github.czyzby.kiwi.util.gdx.reflection.Reflection;
import com.github.czyzby.kiwi.util.tuple.mutable.MutableSingle;

/** Manages i18n. Reads locale from preferences and allows to easily save it. Provides informations about current
 * locale.
 *
 * @author MJ */
public class LocaleService extends AbstractAnnotationProcessor {
    /** Regex used to split locales extracted from preferences or string variables containing locales, and to convert
     * {@link java.util.Locale} objects to strings. Defaults to "-". Can be changed globally, before context loading. */
    public static String DEFAULT_LOCALE_SEPARATOR = "-";
    /** Default locale used when no other value is given. Can be changed globally. */
    public static String DEFAULT_LANGUAGE = "en";

    @Inject private InterfaceService interfaceService;

    private final MutableSingle currentLocale = MutableSingle.of(null);
    private Runnable doOnLocaleChange = new LocaleChangeAction(this);
    private ObjectProvider defaultLocaleProvider = new ObjectProvider() {
        @Override
        public Locale provide() {
            return toLocale(DEFAULT_LANGUAGE);
        }
    };

    private String localePreferencesPath;
    private String localePreferenceName;

    /** @param locale string containing locale with parts separated with {@link #DEFAULT_LOCALE_SEPARATOR}
     * @return locale constructed with the processed string.
     * @throws GdxRuntimeException if string is invalid. */
    public static Locale toLocale(final String locale) {
        final String[] localeParts = locale.split(DEFAULT_LOCALE_SEPARATOR);
        switch (localeParts.length) {
            case 3:
                return new Locale(localeParts[0], localeParts[1], localeParts[2]);
            case 2:
                return new Locale(localeParts[0], localeParts[1]);
            case 1:
                return new Locale(localeParts[0]);
            default:
                throw new GdxRuntimeException("Invalid locale preference. Received: " + locale);
        }
    }

    /** @param locale will be converted to string.
     * @return string with locale data separated with {@link #DEFAULT_LOCALE_SEPARATOR}; */
    public static String fromLocale(final Locale locale) {
        final StringBuilder localeBuilder = new StringBuilder();
        localeBuilder.append(locale.getLanguage());
        if (Strings.isNotEmpty(locale.getCountry())) {
            localeBuilder.append(DEFAULT_LOCALE_SEPARATOR).append(locale.getCountry());
            if (Strings.isNotEmpty(locale.getVariant())) {
                localeBuilder.append(DEFAULT_LOCALE_SEPARATOR).append(locale.getVariant());
            }
        }
        return localeBuilder.toString();
    }

    /** @return current locale of the application. */
    public Locale getCurrentLocale() {
        if (!currentLocale.isPresent()) {
            currentLocale.set(defaultLocaleProvider.provide());
        }
        return currentLocale.get();
    }

    /** @param currentLocale will become the current locale of the application. Triggers on local change action.
     * @see #setActionOnLocaleChange(Runnable) */
    public void setCurrentLocale(final Locale currentLocale) {
        if (!currentLocale.equals(this.currentLocale.get())) {
            this.currentLocale.set(currentLocale);
            if (doOnLocaleChange != null) {
                doOnLocaleChange.run();
            }
        }
    }

    /** @param doOnLocaleChange if not null, will be executed each time locale is changed. Defaults to reloading the
     *            screens with {@link com.github.czyzby.autumn.mvc.component.ui.InterfaceService#reload()} method. */
    public void setActionOnLocaleChange(final Runnable doOnLocaleChange) {
        this.doOnLocaleChange = doOnLocaleChange;
    }

    /** @param defaultLocaleProvider provides default locale if it is not defined in properties. */
    public void setDefaultLocaleProvider(final ObjectProvider defaultLocaleProvider) {
        this.defaultLocaleProvider = defaultLocaleProvider;
    }

    @Override
    public Class getSupportedAnnotationType() {
        return I18nLocale.class;
    }

    @Override
    public boolean isSupportingFields() {
        return true;
    }

    @Override
    public void processField(final Field field, final I18nLocale annotation, final Object component,
            final Context context, final ContextInitializer initializer, final ContextDestroyer contextDestroyer) {
        try {
            final Object locale = Reflection.getFieldValue(field, component);
            if (locale instanceof Locale) {
                currentLocale.set((Locale) locale);
            } else if (locale instanceof String) {
                extractLocaleFromAnnotatedString(annotation, (String) locale);
            }
        } catch (final ReflectionException exception) {
            throw new GdxRuntimeException("Unable to extract application's locale.", exception);
        }

    }

    private void extractLocaleFromAnnotatedString(final I18nLocale localeData, final String locale) {
        if (Strings.isEmpty(localeData.propertiesPath())) {
            currentLocale.set(toLocale(locale));
        } else {
            localePreferencesPath = localeData.propertiesPath();
            localePreferenceName = locale;
            loadLocaleFromPreferences(localeData);
        }
    }

    private void loadLocaleFromPreferences(final I18nLocale localeData) {
        final Preferences localePreferences = ApplicationPreferences.getPreferences(localePreferencesPath);
        currentLocale
                .set(getLocaleFromPreferences(localePreferences, localePreferenceName, localeData.defaultLocale()));
    }

    private static Locale getLocaleFromPreferences(final Preferences localePreferences, final String preferenceName,
            final String defaultLocale) {
        final String locale = localePreferences.getString(preferenceName, defaultLocale);
        return toLocale(locale);
    }

    /** Saves current locale in the preferences. Note that a string configuration variable with name of a preference has
     * to be annotated with {@link com.github.czyzby.autumn.mvc.stereotype.preference.I18nLocale} and given a proper
     * path to preferences for this method to work - otherwise it cannot determine path to the preference.
     *
     * @see #saveLocaleInPreferences(String, String) */
    public void saveLocaleInPreferences() {
        saveLocaleInPreferences(localePreferencesPath, localePreferenceName);
    }

    /** Saves current locale in the selected preferences.
     *
     * @param preferencesPath used to retrieve preferences with
     *            {@link com.github.czyzby.kiwi.util.gdx.preference.ApplicationPreferences#getPreferences(String)}
     *            method.
     * @param preferenceName name of the locale setting in the preferences. */
    public void saveLocaleInPreferences(final String preferencesPath, final String preferenceName) {
        if (Strings.isEmpty(preferencesPath) || Strings.isEmpty(preferenceName)) {
            throw new GdxRuntimeException(
                    "Preference path and name cannot be empty! These are set automatically if you annotate a path to preference with @I18nBundle and pass a corrent path to the preferences.");
        }
        final Preferences preferences = ApplicationPreferences.getPreferences(preferencesPath);
        preferences.putString(preferenceName, fromLocale(currentLocale.get()));
        preferences.flush();
    }

    /** Utility method. Provides direct access to default {@link com.badlogic.gdx.utils.I18NBundle}.
     *
     * @return bundle stored in LML parser with the default key. Might be null. */
    public I18NBundle getI18nBundle() {
        return interfaceService.getParser().getData().getDefaultI18nBundle();
    }

    /** Utility method. Provides direct access to {@link com.badlogic.gdx.utils.I18NBundle} with selected name.
     *
     * @param forName ID of the bundle as it appears in the LML parser.
     * @return bundle stored in LML parser with the selected key. Might be null. */
    public I18NBundle getI18nBundle(final String forName) {
        return interfaceService.getParser().getData().getI18nBundle(forName);
    }

    /** Default action executed on locale change.
     *
     * @author MJ */
    public static class LocaleChangeAction implements Runnable {
        private final LocaleService localeService;

        public LocaleChangeAction(final LocaleService localeService) {
            this.localeService = localeService;
        }

        /** @return handled locale service instance. */
        protected LocaleService getLocaleService() {
            return localeService;
        }

        @Override
        public void run() {
            if (Strings.isNotEmpty(localeService.localePreferenceName)
                    && Strings.isNotEmpty(localeService.localePreferencesPath)) {
                localeService.saveLocaleInPreferences();
            }
            localeService.interfaceService.reload();
        }
    }
}