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With inspiration from other libraries
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
******************************************************************************
* Copyright (C) 2004-2016, International Business Machines Corporation and
* others. All Rights Reserved.
******************************************************************************
*/
package com.ibm.icu.impl;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.MissingResourceException;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
/**
* just a wrapper for Java ListResourceBundles and
* @author ram
*
*/
public final class ResourceBundleWrapper extends UResourceBundle {
private ResourceBundle bundle = null;
private String localeID = null;
private String baseName = null;
private List keys = null;
/** Loader for bundle instances, for caching. */
private static abstract class Loader {
abstract ResourceBundleWrapper load();
}
private static CacheBase BUNDLE_CACHE =
new SoftCache() {
@Override
protected ResourceBundleWrapper createInstance(String unusedKey, Loader loader) {
return loader.load();
}
};
private ResourceBundleWrapper(ResourceBundle bundle){
this.bundle=bundle;
}
@Override
protected Object handleGetObject(String aKey){
ResourceBundleWrapper current = this;
Object obj = null;
while(current!=null){
try{
obj = current.bundle.getObject(aKey);
break;
}catch(MissingResourceException ex){
current = (ResourceBundleWrapper)current.getParent();
}
}
if (obj == null){
throw new MissingResourceException("Can't find resource for bundle "
+baseName
+", key "+aKey,
this.getClass().getName(),
aKey);
}
return obj;
}
@Override
public Enumeration getKeys(){
return Collections.enumeration(keys);
}
private void initKeysVector(){
ResourceBundleWrapper current = this;
keys = new ArrayList();
while(current!=null){
Enumeration e = current.bundle.getKeys();
while(e.hasMoreElements()){
String elem = e.nextElement();
if(!keys.contains(elem)){
keys.add(elem);
}
}
current = (ResourceBundleWrapper)current.getParent();
}
}
@Override
protected String getLocaleID(){
return localeID;
}
@Override
protected String getBaseName(){
return bundle.getClass().getName().replace('.','/');
}
@Override
public ULocale getULocale(){
return new ULocale(localeID);
}
@Override
public UResourceBundle getParent(){
return (UResourceBundle)parent;
}
// Flag for enabling/disabling debugging code
private static final boolean DEBUG = ICUDebug.enabled("resourceBundleWrapper");
// This method is for super class's instantiateBundle method
public static ResourceBundleWrapper getBundleInstance(String baseName, String localeID,
ClassLoader root, boolean disableFallback) {
if (root == null) {
root = ClassLoaderUtil.getClassLoader();
}
ResourceBundleWrapper b;
if (disableFallback) {
b = instantiateBundle(baseName, localeID, null, root, disableFallback);
} else {
b = instantiateBundle(baseName, localeID, ULocale.getDefault().getBaseName(),
root, disableFallback);
}
if(b==null){
String separator ="_";
if(baseName.indexOf('/')>=0){
separator = "/";
}
throw new MissingResourceException("Could not find the bundle "+ baseName+separator+ localeID,"","");
}
return b;
}
private static boolean localeIDStartsWithLangSubtag(String localeID, String lang) {
return localeID.startsWith(lang) &&
(localeID.length() == lang.length() || localeID.charAt(lang.length()) == '_');
}
private static ResourceBundleWrapper instantiateBundle(
final String baseName, final String localeID, final String defaultID,
final ClassLoader root, final boolean disableFallback) {
final String name = localeID.isEmpty() ? baseName : baseName + '_' + localeID;
String cacheKey = disableFallback ? name : name + '#' + defaultID;
return BUNDLE_CACHE.getInstance(cacheKey, new Loader() {
@Override
public ResourceBundleWrapper load() {
ResourceBundleWrapper parent = null;
int i = localeID.lastIndexOf('_');
boolean loadFromProperties = false;
boolean parentIsRoot = false;
if (i != -1) {
String locName = localeID.substring(0, i);
parent = instantiateBundle(baseName, locName, defaultID, root, disableFallback);
}else if(!localeID.isEmpty()){
parent = instantiateBundle(baseName, "", defaultID, root, disableFallback);
parentIsRoot = true;
}
ResourceBundleWrapper b = null;
try {
Class cls =
root.loadClass(name).asSubclass(ResourceBundle.class);
ResourceBundle bx = cls.newInstance();
b = new ResourceBundleWrapper(bx);
if (parent != null) {
b.setParent(parent);
}
b.baseName=baseName;
b.localeID = localeID;
} catch (ClassNotFoundException e) {
loadFromProperties = true;
} catch (NoClassDefFoundError e) {
loadFromProperties = true;
} catch (Exception e) {
if (DEBUG)
System.out.println("failure");
if (DEBUG)
System.out.println(e);
}
if (loadFromProperties) {
try {
final String resName = name.replace('.', '/') + ".properties";
InputStream stream = java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
@Override
public InputStream run() {
return root.getResourceAsStream(resName);
}
}
);
if (stream != null) {
// make sure it is buffered
stream = new java.io.BufferedInputStream(stream);
try {
b = new ResourceBundleWrapper(new PropertyResourceBundle(stream));
if (parent != null) {
b.setParent(parent);
}
b.baseName=baseName;
b.localeID=localeID;
} catch (Exception ex) {
// throw away exception
} finally {
try {
stream.close();
} catch (Exception ex) {
// throw away exception
}
}
}
// if a bogus locale is passed then the parent should be
// the default locale not the root locale!
if (b == null && !disableFallback &&
!localeID.isEmpty() && localeID.indexOf('_') < 0 &&
!localeIDStartsWithLangSubtag(defaultID, localeID)) {
// localeID is only a language subtag, different from the default language.
b = instantiateBundle(baseName, defaultID, defaultID, root, disableFallback);
}
// if still could not find the bundle then return the parent
if(b==null && (!parentIsRoot || !disableFallback)){
b=parent;
}
} catch (Exception e) {
if (DEBUG)
System.out.println("failure");
if (DEBUG)
System.out.println(e);
}
}
if(b!=null){
b.initKeysVector();
}else{
if(DEBUG)System.out.println("Returning null for "+baseName+"_"+localeID);
}
return b;
}});
}
}