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/*******************************************************************************
* Copyright (c) 2011 BestSolution.at and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
******************************************************************************/
package org.eclipse.e4.tools.services.impl;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.List;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
import org.eclipse.osgi.service.localization.BundleLocalization;
/**
* The lookup of the translation the same than the one in {@link BundleLocalization} which is based
* upon the value found in equinox.root.locale which defaults to "en":
* <ul>
* <li>If set to empty string then the search order for:
* <ul>
* <li>bn + Ls + "_" + Cs + "_" + Vs</li>
* <li>bn + Ls + "_" + Cs</li>
* <li>bn + Ls</li>
* <li>bn + Ld + "_" + Cd + "_" + Vd</li>
* <li>bn + Ld + "_" + Cd</li>
* <li>bn + Ld</li>
* </ul>
* </li>
* <li>If Ls equals the value of equinox.root.locale then the following search order is used:
* <ul>
* <li>bn + Ls + "_" + Cs + "_" + Vs</li>
* <li>bn + Ls + "_" + Cs</li>
* <li>bn + Ls</li>
* <li>bn + Ld + "_" + Cd + "_" + Vd</li>
* <li>bn + Ld + "_" + Cd</li>
* <li>bn + Ld</li>
* </ul>
* </li>
* </ul>
* Where bn is this bundle's localization basename, Ls, Cs and Vs are the specified locale
* (language, country, variant) and Ld, Cd and Vd are the default locale (language, country,
* variant).
*/
public abstract class AbstractTranslationProvider {
final static String DEFAULT_ROOT = getEquinoxRootLocale();
private final Hashtable<String, BundleResourceBundle> cache = new Hashtable<String, BundleResourceBundle>(
5);
private static String getEquinoxRootLocale() {
// Logic from FrameworkProperties.getProperty("equinox.root.locale", "en")
String root = System.getProperties().getProperty("equinox.root.locale");
if (root == null) {
root = "en";
}
return root;
}
protected abstract InputStream getResourceAsStream(String name);
protected abstract String getBasename();
public String translate(String locale, String key) {
String defaultLocale = Locale.getDefault().toString();
String localeString = locale;
ResourceBundle bundle = getResourceBundle(locale.toString(),
defaultLocale.equals(localeString));
try {
if( bundle == null ) {
return key;
}
return bundle.getString(key);
} catch (Exception e) {
e.printStackTrace();
return key;
}
}
private ResourceBundle getResourceBundle(String localeString, boolean isDefaultLocale) {
BundleResourceBundle resourceBundle = lookupResourceBundle(localeString);
if (isDefaultLocale)
return (ResourceBundle) resourceBundle;
// need to determine if this is resource bundle is an empty stem
// if it is then the default locale should be used
if (resourceBundle == null || resourceBundle.isStemEmpty())
return (ResourceBundle) lookupResourceBundle(Locale.getDefault().toString());
return (ResourceBundle) resourceBundle;
}
private interface BundleResourceBundle {
void setParent(ResourceBundle parent);
boolean isEmpty();
boolean isStemEmpty();
}
private BundleResourceBundle lookupResourceBundle(String localeString) {
// get the localization header as late as possible to avoid accessing the raw headers
// getting the first value from the raw headers forces the manifest to be parsed (bug
// 332039)
String localizationHeader = getBasename();
synchronized (cache) {
BundleResourceBundle result = cache.get(localeString);
if (result != null)
return result.isEmpty() ? null : result;
String[] nlVarients = buildNLVariants(localeString);
BundleResourceBundle parent = null;
for (int i = nlVarients.length - 1; i >= 0; i--) {
BundleResourceBundle varientBundle = null;
InputStream resourceStream = getResourceAsStream(localizationHeader
+ (nlVarients[i].equals("") ? nlVarients[i] : '_' + nlVarients[i])
+ ".properties");
if (resourceStream == null) {
varientBundle = cache.get(nlVarients[i]);
} else {
try {
varientBundle = new LocalizationResourceBundle(resourceStream);
} catch (IOException e) {
// ignore and continue
} finally {
if (resourceStream != null) {
try {
resourceStream.close();
} catch (IOException e3) {
// Ignore exception
}
}
}
}
if (varientBundle == null) {
varientBundle = new EmptyResouceBundle(nlVarients[i]);
}
if (parent != null)
varientBundle.setParent((ResourceBundle) parent);
cache.put(nlVarients[i], varientBundle);
parent = varientBundle;
}
result = cache.get(localeString);
return result.isEmpty() ? null : result;
}
}
private String[] buildNLVariants(String nl) {
List<String> result = new ArrayList<String>();
while (nl.length() > 0) {
result.add(nl);
int i = nl.lastIndexOf('_');
nl = (i < 0) ? "" : nl.substring(0, i); //$NON-NLS-1$
}
result.add(""); //$NON-NLS-1$
return result.toArray(new String[result.size()]);
}
private class LocalizationResourceBundle extends PropertyResourceBundle implements
BundleResourceBundle {
public LocalizationResourceBundle(InputStream in) throws IOException {
super(in);
}
public void setParent(ResourceBundle parent) {
super.setParent(parent);
}
public boolean isEmpty() {
return false;
}
public boolean isStemEmpty() {
return parent == null;
}
}
class EmptyResouceBundle extends ResourceBundle implements BundleResourceBundle {
private final String localeString;
public EmptyResouceBundle(String locale) {
super();
this.localeString = locale;
}
public Enumeration<String> getKeys() {
return null;
}
protected Object handleGetObject(String arg0) throws MissingResourceException {
return null;
}
public void setParent(ResourceBundle parent) {
super.setParent(parent);
}
public boolean isEmpty() {
if (parent == null)
return true;
return ((BundleResourceBundle) parent).isEmpty();
}
public boolean isStemEmpty() {
if (DEFAULT_ROOT.equals(localeString))
return false;
if (parent == null)
return true;
return ((BundleResourceBundle) parent).isStemEmpty();
}
}
protected void clearCache() {
cache.clear();
}
}
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