/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jsp;
import com.caucho.loader.Environment;
import com.caucho.loader.EnvironmentLocal;
import com.caucho.util.L10N;
import com.caucho.util.TimedCache;
import com.caucho.vfs.Path;
import com.caucho.vfs.ReadStream;
import javax.servlet.jsp.jstl.fmt.LocalizationContext;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Locale;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.lang.reflect.Method;
/**
* Manages i18n bundles
*/
public class BundleManager {
private static final L10N L = new L10N(BundleManager.class);
private static final Logger log
= Logger.getLogger(BundleManager.class.getName());
public static final LocalizationContext NULL_BUNDLE
= new LocalizationContext();
private static EnvironmentLocal<BundleManager> _envBundle
= new EnvironmentLocal<BundleManager>();
private TimedCache<String,LocalizationContext> _bundleCache;
private Method _bundleSetParentMethod;
private BundleManager()
{
long updateInterval = Environment.getDependencyCheckInterval();
_bundleCache = new TimedCache(256, updateInterval);
try {
_bundleSetParentMethod
= ResourceBundle.class.getDeclaredMethod("setParent",
new Class[]{
ResourceBundle.class});
_bundleSetParentMethod.setAccessible(true);
}
catch (Exception e) {
log.log(Level.WARNING, e.getMessage(), e);
}
}
/**
* Returns the environment's bundle.
*/
public static BundleManager create()
{
BundleManager manager;
synchronized (_envBundle) {
manager = _envBundle.get();
if (manager == null) {
manager = new BundleManager();
_envBundle.set(manager);
}
}
return manager;
}
/**
* Returns the named ResourceBundle.
*/
public LocalizationContext getBundle(String name, String cacheKey,
Enumeration<Locale> locales)
{
LocalizationContext cachedValue = _bundleCache.get(cacheKey);
if (cachedValue != null)
return cachedValue == NULL_BUNDLE ? null : cachedValue;
while (locales.hasMoreElements()) {
Locale locale = locales.nextElement();
LocalizationContext bundle = getBundle(name, locale);
if (bundle != null) {
_bundleCache.put(cacheKey, bundle);
return bundle;
}
}
_bundleCache.put(cacheKey, NULL_BUNDLE);
return null;
}
/**
* Returns the named ResourceBundle.
*/
public LocalizationContext getBundle(String name, Locale locale)
{
String cacheName = (name
+ '_' + locale.getLanguage()
+ '_' + locale.getCountry()
+ '_' + locale.getVariant());
LocalizationContext context;
context = _bundleCache.get(cacheName);
if (context != null)
return context != NULL_BUNDLE ? context : null;
ResourceBundle parent = getBaseBundle(name);
ResourceBundle bundle = getBaseBundle(name
+ '_' + locale.getLanguage());
ResourceBundle matchBundle = null;
if (bundle != null) {
if (parent != null) {
try {
_bundleSetParentMethod.invoke(bundle, parent);
}
catch (Exception e) {
log.log(Level.WARNING, e.getMessage(), e);
}
}
parent = bundle;
matchBundle = bundle;
}
bundle = getBaseBundle(name
+ '_' + locale.getLanguage()
+ '_' + locale.getCountry());
if (bundle != null) {
if (parent != null) {
try {
_bundleSetParentMethod.invoke(bundle, parent);
}
catch (Exception e) {
log.log(Level.WARNING, e.getMessage(), e);
}
}
parent = bundle;
matchBundle = bundle;
}
bundle = getBaseBundle(name
+ '_' + locale.getLanguage()
+ '_' + locale.getCountry()
+ '_' + locale.getVariant());
if (bundle != null) {
if (parent != null) {
try {
_bundleSetParentMethod.invoke(bundle, parent);
}
catch (Exception e) {
log.log(Level.WARNING, e.getMessage(), e);
}
}
parent = bundle;
matchBundle = bundle;
}
if (matchBundle != null) {
context = new LocalizationContext(matchBundle, locale);
_bundleCache.put(cacheName, context);
return context;
}
_bundleCache.put(cacheName, NULL_BUNDLE);
return null;
}
/**
* Returns the named ResourceBundle.
*/
public LocalizationContext getBundle(String name)
{
if (name == null)
return null;
LocalizationContext bundle = _bundleCache.get(name);
if (bundle != null)
return bundle != NULL_BUNDLE ? bundle : null;
ResourceBundle resourceBundle = getBaseBundle(name);
if (resourceBundle != null) {
bundle = new LocalizationContext(resourceBundle);
_bundleCache.put(name, bundle);
return bundle;
}
_bundleCache.put(name, NULL_BUNDLE);
return null;
}
/**
* Returns the base resource bundle.
*/
private ResourceBundle getBaseBundle(String name)
{
ClassLoader loader = Thread.currentThread().getContextClassLoader();
try {
Class cl = Class.forName(name, false, loader);
if (cl != null) {
ResourceBundle rb = (ResourceBundle) cl.newInstance();
if (rb != null)
return rb;
}
} catch (Throwable e) {
log.log(Level.FINEST, e.toString(), e);
}
try {
InputStream is = loader.getResourceAsStream(name.replace('.', '/') + ".properties");
if (is instanceof ReadStream) {
Path path = ((ReadStream) is).getPath();
Environment.addDependency(path.createDepend());
}
ResourceBundle bundle = new PropertyResourceBundle(is);
is.close();
return bundle;
} catch (Exception e) {
log.log(Level.FINEST, e.toString(), e);
}
return null;
}
}