/**
* Copyright (c) 2011-2012, James Zhan 詹波 (jfinal@126.com).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jfinal.i18n;
import java.util.Enumeration;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import com.jfinal.core.Const;
/**
* I18N support.
*
* 1: Config parameters in JFinalConfig
* 2: Init I18N in JFinal
* 3: I18N support text with Locale
* 4: ActionContext use I18N.getText(...) with Local setting in I18nInterceptor
* 5: The resource file in WEB-INF/classes
*
* important: Locale can create with language like new Locale("xxx");
*
* need test
* Using String get Locale was learned from Strus2
*/
public class I18N {
private static String baseName;
private static Locale defaultLocale = Locale.getDefault();
private static int i18nMaxAgeOfCookie = Const.DEFAULT_I18N_MAX_AGE_OF_COOKIE;
private static final NullResourceBundle NULL_RESOURCE_BUNDLE = new NullResourceBundle();
private static final ConcurrentMap<String, ResourceBundle> bundlesMap = new ConcurrentHashMap<String, ResourceBundle>();
private static volatile I18N me;
private I18N() {
}
public static I18N me() {
if (me == null)
synchronized (I18N.class) {
if (me == null)
me = new I18N();
}
return me;
}
public static void init(String baseName, Locale defaultLocale, Integer i18nMaxAgeOfCookie) {
I18N.baseName = baseName;
if (defaultLocale != null)
I18N.defaultLocale = defaultLocale;
if (i18nMaxAgeOfCookie != null)
I18N.i18nMaxAgeOfCookie = i18nMaxAgeOfCookie;
}
public static Locale getDefaultLocale() {
return defaultLocale;
}
final static public int getI18nMaxAgeOfCookie() {
return i18nMaxAgeOfCookie;
}
private static ResourceBundle getResourceBundle(Locale locale) {
String resourceBundleKey = getresourceBundleKey(locale);
ResourceBundle resourceBundle = bundlesMap.get(resourceBundleKey);
if (resourceBundle == null) {
try {
resourceBundle = ResourceBundle.getBundle(baseName, locale);
bundlesMap.put(resourceBundleKey, resourceBundle);
}
catch (MissingResourceException e) {
resourceBundle = NULL_RESOURCE_BUNDLE;
}
}
return resourceBundle;
}
/**
* 将来只改这里就可以了: resourceBundleKey的生成规则
*/
private static String getresourceBundleKey(Locale locale) {
// return baseName + "_" + locale.toString(); // "_" 貌似与无关, 为了提升性能, 故去掉
return baseName + locale.toString();
}
public static String getText(String key) {
return getResourceBundle(defaultLocale).getString(key);
}
public static String getText(String key, String defaultValue) {
String result = getResourceBundle(defaultLocale).getString(key);
return result != null ? result : defaultValue;
}
public static String getText(String key, Locale locale) {
return getResourceBundle(locale).getString(key);
}
public static String getText(String key, String defaultValue, Locale locale) {
String result = getResourceBundle(locale).getString(key);
return result != null ? result : defaultValue;
}
// public static Locale localeFromString(String localeStr, Locale defaultLocale) {
public static Locale localeFromString(String localeStr) {
if ((localeStr == null) || (localeStr.trim().length() == 0) || ("_".equals(localeStr))) {
// return (defaultLocale != null) ? defaultLocale : Locale.getDefault(); // 原实现被注掉
return defaultLocale;
}
int index = localeStr.indexOf('_');
if (index < 0) {
return new Locale(localeStr);
}
String language = localeStr.substring(0, index);
if (index == localeStr.length()) {
return new Locale(language);
}
localeStr = localeStr.substring(index + 1);
index = localeStr.indexOf('_');
if (index < 0) {
return new Locale(language, localeStr);
}
String country = localeStr.substring(0, index);
if (index == localeStr.length()) {
return new Locale(language, country);
}
localeStr = localeStr.substring(index + 1);
return new Locale(language, country, localeStr);
}
private static class NullResourceBundle extends ResourceBundle {
public Enumeration<String> getKeys() {
return null; // dummy
}
protected Object handleGetObject(String key) {
return null; // dummy
}
}
// 可惜的是使用Local可以被 new 出来, 造成了无法判断相等，后来测试，可以使用 equals方法来判断是否相等
public static void main(String[] args) {
// Locale.getDefault();
// Locale en = Locale.US;
// Locale us = Locale.US;
// System.out.println(l.toString());
// System.out.println(en == us);
// System.out.println(en.equals(us));
// 下面的 taiwan.getLanguage()值仍为 zh,所以可以确定i18n实现有缺陷,即 language不能唯一确定Local对象
// 造成了无法通过 language不好还原
System.out.println(Locale.CHINESE.getLanguage());
System.out.println(Locale.CHINA.getLanguage());
System.out.println(Locale.SIMPLIFIED_CHINESE.getLanguage());
System.out.println(Locale.TRADITIONAL_CHINESE.getLanguage());
System.out.println(Locale.TAIWAN.getLanguage());
Locale shoudong = new Locale("en");
System.out.println(shoudong.getLanguage().equals(Locale.US.getLanguage()));
System.out.println(shoudong.getLanguage().equals(Locale.ENGLISH.getLanguage()));
System.out.println(shoudong.getLanguage().equals(Locale.CANADA.getLanguage()));
System.out.println(shoudong.getLanguage().equals(Locale.UK.getLanguage()));
System.out.println(shoudong.getLanguage().equals(Locale.CANADA_FRENCH.getLanguage()));
}
}