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*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
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* or LICENSE.txt. See the License for the specific
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* file and include the License file at LICENSE.txt.
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package com.sun.webui.jsf.util;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
/**
* This class caches ResourceBundle objects per locale.
*
* @author Ken Paulsen ([email protected])
*/
public class ResourceBundleManager {
/**
* Singleton
*/
private static ResourceBundleManager _instance =
new ResourceBundleManager();
/**
* The cache of ResourceBundles.
*/
private Map _cache = new HashMap();
/**
* Use getInstance() to obtain an instance.
*/
protected ResourceBundleManager() {
}
/**
* Use this method to get the instance of this class.
*/
public static ResourceBundleManager getInstance() {
if (_instance == null) {
_instance = new ResourceBundleManager();
}
return _instance;
}
/**
* This method checks the cache for the requested resource bundle.
*
* @param baseName Name of the bundle
* @param locale The locale
*
* @return The requested ResourceBundle in the most appropriate locale.
*/
protected ResourceBundle getCachedBundle(String baseName, Locale locale) {
return (ResourceBundle)_cache.get(getCacheKey(baseName, locale));
}
/**
* This method generates a unique key for setting / getting Resources
* bundles from the cache. It is important to have different keys per
* locale (obviously).
*/
protected String getCacheKey(String baseName, Locale locale) {
return baseName+"__"+locale.toString();
}
/**
* This method adds a ResourceBundle to the cache.
*/
protected void addCachedBundle(String baseName, Locale locale, ResourceBundle bundle) {
// Copy the old Map to prevent changing a Map while someone is
// accessing it.
Map map = new HashMap(_cache);
// Add the new bundle
map.put(getCacheKey(baseName, locale), bundle);
// Set this new Map as the shared cache Map
_cache = map;
}
/**
* This method obtains the requested resource bundle as specified by the
* given basename and locale.
*/
public ResourceBundle getBundle(String baseName, Locale locale) {
ResourceBundle bundle = getCachedBundle(baseName, locale);
if (bundle == null) {
bundle = ResourceBundle.getBundle(baseName, locale,
ClassLoaderFinder.getCurrentLoader(MessageUtil.class));
if (bundle != null) {
addCachedBundle(baseName, locale, bundle);
}
}
return bundle;
}
/**
* This method obtains the requested resource bundle as specified by the
* given basename, locale, and classloader.
*/
public ResourceBundle getBundle(String baseName, Locale locale, ClassLoader loader) {
ResourceBundle bundle = getCachedBundle(baseName, locale);
if (bundle == null) {
bundle = ResourceBundle.getBundle(baseName, locale, loader);
if (bundle != null) {
addCachedBundle(baseName, locale, bundle);
}
}
return bundle;
}
}
