org.vosao.i18n.Messages.java Source code

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Here is the source code for org.vosao.i18n.Messages.java

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/**
 * Vosao CMS. Simple CMS for Google App Engine.
 * 
 * Copyright (C) 2009-2010 Vosao development team.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * email: vosao.dev@gmail.com
 */

package org.vosao.i18n;

import java.text.MessageFormat;
import java.util.Collections;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.vosao.business.Business;
import org.vosao.common.VosaoContext;
import org.vosao.entity.ConfigEntity;
import org.vosao.entity.LanguageEntity;

/**
 * Message bundle helper class for creatng localized messages from Java code.
 * 
 * @author Alexander Oleynik
 *
 */
public class Messages {

    private static final Log logger = LogFactory.getLog(Messages.class);

    public static final String I18N_CACHE_KEY = "i18n_";

    private static final Locale[] supportedLocales = { Locale.ENGLISH, Locale.GERMAN, new Locale("es"),
            new Locale("sv"), new Locale("ru"), new Locale("cs"), new Locale("tr"), new Locale("pt", "BR"),
            Locale.JAPANESE, Locale.TRADITIONAL_CHINESE, Locale.SIMPLIFIED_CHINESE };

    private static Map<Locale, VosaoResourceBundle> bundles = new HashMap<Locale, VosaoResourceBundle>();

    private static VosaoResourceBundle getBundle(HttpServletRequest request) {
        Locale sessionLocale = VosaoContext.getInstance().getSession().getLocale();
        Locale locale = sessionLocale != null ? sessionLocale : request.getLocale();
        return getBundle(locale);
    }

    private static VosaoResourceBundle getDefaultBundle() {
        return getBundle(Locale.ENGLISH);
    }

    private static VosaoResourceBundle getBundle(Locale locale) {
        if (!bundles.containsKey(locale)) {
            bundles.put(locale, new VosaoResourceBundle(locale));
        }
        return bundles.get(locale);
    }

    public static String get(String key, Object... objects) {
        VosaoContext ctx = VosaoContext.getInstance();
        String pattern = "not found";
        if (isLocaleSupported(ctx.getLocale())) {
            pattern = getBundle(ctx.getRequest()).getString(key);
        } else {
            pattern = getDefaultBundle().getString(key);
        }
        if (objects != null) {
            MessageFormat formatter = new MessageFormat("");
            formatter.setLocale(ctx.getLocale());
            formatter.applyPattern(pattern);
            pattern = formatter.format(objects);
        }
        return pattern;
    }

    private static Business getBusiness() {
        return VosaoContext.getInstance().getBusiness();
    }

    /**
     * Generate JavaScript JSON message bundle for JavaScript messages 
     * localization.
     * @return JS file.
     */
    public static String getJSMessages() {
        VosaoContext ctx = VosaoContext.getInstance();
        String cached = (String) getBusiness().getSystemService().getCache()
                .get(I18N_CACHE_KEY + ctx.getLanguage());

        logger.debug("checking is i18n_" + ctx.getLanguage() + " in cache: " + (cached != null ? "yes" : "no"));

        if (cached != null)
            return cached;
        Map<String, String> messages = new HashMap<String, String>();
        VosaoResourceBundle defaultBundle = getDefaultBundle();
        for (String key : Collections.list(defaultBundle.getKeys())) {
            try {
                messages.put(key, defaultBundle.getString(key));
            } catch (MissingResourceException e) {
            }
        }
        VosaoResourceBundle bundle = getBundle(ctx.getRequest());
        for (String key : Collections.list(bundle.getKeys())) {
            try {
                messages.put(key, bundle.getString(key));
            } catch (MissingResourceException e) {
            }
        }
        ConfigEntity config = VosaoContext.getInstance().getConfig();
        StringBuffer result = new StringBuffer();
        result.append("var locale = '").append(ctx.getLocale().toString()).append("';\n");
        result.append("var locale_language = '").append(ctx.getLocale().getLanguage()).append("';\n");
        result.append("var default_language = '").append(getBusiness().getDefaultLanguage()).append("';\n");
        result.append("function messages(key) {\n" + "  if (_messages[key] == 'undefined') {\n"
                + "    return '__' + key + '__';\n" + "  } else {\n" + "    return _messages[key];\n" + "  }\n"
                + "}\n");
        result.append("var _messages = {\n");
        int i = 0;
        for (String key : messages.keySet()) {
            if (i++ > 0) {
                result.append(",");
            }
            result.append(" '").append(key).append("' : '").append(filterForJS(messages.get(key))).append("'\n");
        }
        result.append("};");

        cached = result.toString();
        getBusiness().getSystemService().getCache().put(I18N_CACHE_KEY + ctx.getLanguage(), cached);

        logger.debug("put i18n_" + ctx.getLanguage() + " to cache");

        return cached;
    }

    public static void resetCache() {
        VosaoContext ctx = VosaoContext.getInstance();
        for (LanguageEntity language : ctx.getBusiness().getDao().getLanguageDao().select()) {
            getBusiness().getSystemService().getCache().remove(I18N_CACHE_KEY + language.getCode());
        }
    }

    private static String filterForJS(String msg) {
        return msg.replaceAll("\n", "").replaceAll("'", "\\\\'");
    }

    public static boolean isLocaleSupported(Locale locale) {
        for (Locale l : supportedLocales) {
            if (l.equals(locale)) {
                return true;
            }
        }
        return false;
    }

}