/*
* Beryl - A web platform based on XML, XSLT and Java
* This file is part of the Beryl XML GUI
*
* Copyright (C) 2004 Wenzel Jakob <wazlaf@tigris.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This program 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-3107 USA
*/
package org.beryl.gui;
import java.net.URL;
import java.util.ArrayList;
import java.util.Locale;
import java.util.Properties;
import org.apache.log4j.Logger;
/**
* This class provides internationalization support for the XML GUI
*/
public class InternationalizationManager {
private static Properties properties = new Properties();
private static Logger log = Logger.getLogger(InternationalizationManager.class);
private static ArrayList sources = new ArrayList();
/**
* Implement this interface to provide extensions to the internationalizationManager
*/
public interface InternationalizationSource {
public String getString(String identifier);
};
/**
* Add a language file to the internationalization database
*/
public static void addLanguageFile(String prefix) throws GUIException {
try {
URL url = InternationalizationManager.class.getResource("/" + prefix + "." + Locale.getDefault().toString() + ".properties");
properties.load(url.openStream());
} catch (Exception e) {
throw new GUIException("Error while loading internationalization property file", e);
}
}
/**
* Add an external source for internationalizations
*/
public static void addInternationalizationSource(InternationalizationSource source) {
sources.add(source);
}
/**
* Get the internationalized string for a generic identifier
*/
public static String getString(String identifier) {
try {
String value = properties.getProperty(identifier);
if (value == null) {
for (int i=0, size=sources.size(); i<size; i++) {
value = ((InternationalizationSource) sources.get(i)).getString(identifier);
if (value != null)
return value;
}
if (!identifier.equals(""))
log.warn("no internationalization for identifier ["+identifier+"]");
return identifier;
}
return value;
} catch (Exception e) {
if (identifier == null)
return "(null)";
else
throw new RuntimeException("Error while looking up internationalization", e);
}
}
}