Translator.java

package stray;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Locale;
import java.util.MissingResourceException;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Preferences;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.I18NBundle;

public class Translator {

	private static Translator instance;

	private Translator() {
	}

	public static Translator instance() {
		if (instance == null) {
			instance = new Translator();
			instance.loadResources();
		}
		return instance;
	}

	public String currentLang() {
		return languageList.get(toUse);
	}

	public void setLanguage(String lang) {
		for (int i = 0; i < languageList.size; i++) {
			if (languageList.get(i).equalsIgnoreCase(lang)) {
				toUse = i;
				return;
			}
		}
		toUse = 0;
	}

	public String nextLang() {
		if (bundles.size() == 1) return languageList.get(toUse);
		if (toUse + 1 == bundles.size()) {
			toUse = 0;
		} else {
			toUse++;
		}
		return languageList.get(toUse);
	}

	public String prevLang() {
		if (bundles.size() == 1) return languageList.get(toUse);
		if (toUse - 1 < 0) {
			toUse = bundles.size() - 1;
		} else {
			toUse--;
		}
		return languageList.get(toUse);
	}

	private Array<String> caught = new Array<String>(128);
	private FileHandle base;

	public HashMap<String, I18NBundle> bundles = new HashMap<String, I18NBundle>();

	public int toUse = 0;
	public Array<String> languageList = new Array<String>();

	public static final String defaultLang = "English";

	private void loadResources() {
		base = Gdx.files.internal("localization/default");

		languageList.clear();
		languageList.ordered = true;

		addBundle(defaultLang, I18NBundle.createBundle(base, new Locale("")));
//		addBundle("Česky", I18NBundle.createBundle(base, new Locale("cz")));

		Preferences settings = Settings.getPreferences();
		for (int i = 0; i < languageList.size; i++) {
			String lang = languageList.get(i);
			if (lang.equalsIgnoreCase(settings.getString("language", defaultLang))) {
				toUse = i;
			}
		}
	}

	private void addBundle(String name, I18NBundle bundle) {
		languageList.add(name);
		bundles.put(name, bundle);
	}

	private static I18NBundle getBundle() {
		return instance().bundles.get(instance().languageList.get(instance().toUse));
	}

	public static String getMsg(String key, Object... params) {
		String s = "";

		if (instance().caught.contains(key, false)) {
			return key;
		}

		try {
			if (params == null) {
				s = getBundle().get(key);
			} else s = getBundle().format(key, params);
		} catch (MissingResourceException m) {
			if (!instance().caught.contains(key, false)) {
				instance().caught.add(key + "");
				Main.logger.warn("WARNING: the bundle \""
						+ instance().base.nameWithoutExtension() + "_"
						+ getBundle().getLocale().toString() + "\" has no key \"" + key + "\"");
			}
			return key;
		}
		return s;
	}

}