i18n.java

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/*
 * I18n.java
 *
 * iReport  --  Visual designer for generating JasperReports Documents
 *  Copyright (C) 2002-2003  Giulio Toffoli [e-mail]
 *
 *  This program 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.
 *
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Giulio Toffoli
 *  Via T.Aspetti, 233
 *  35100 Padova ITALY
 *  [e-mail]
 *
 * Created on 13 March 2004, 21:43
 */

package it.businesslogic.ireport.util;

import java.util.*;
import java.util.jar.*;
import java.net.*;
import java.io.*;

/**
 *
 * @author  ertano
 */
public class I18n {

    public static final String localPackageName = "it/businesslogic/ireport/locale/";
    public static final String baseName = "Ireport";
    private static java.util.ResourceBundle oLanguage = null;
    
    public static java.util.Vector languageChangedListeners = null;
    
    static {
        
        languageChangedListeners = new Vector();
    }
    
    public static void addOnLanguageChangedListener(LanguageChangedListener listener)
    {
        languageChangedListeners.add( listener );
    }
    
    /**
     * Get the list of supported translations.
     *
     * Load the list of property files in the it/businesslogic/ireport/locale/
     * package.
     * 
     */
    public static java.util.List getListOfAvailLanguages(){
        java.util.List supportedLocales = new java.util.ArrayList();
        try {
            Set names = Misc.getResoucesInPackage( localPackageName );
            Iterator it = names.iterator();
            while( it.hasNext() ) {
                String n = (String)it.next();
                
                // From 
                //    'it/businesslogic/ireport/locale/Ireport_en.properties'
                //   or 
                //    'it/businesslogic/ireport/locale/Ireport_en_UK.properties'
                // To
                // 'en' OR 'en_UK'
                String lang = n.substring( n.lastIndexOf('/')+1 );
                lang = lang.substring(0, lang.indexOf(".properties") );
                lang = lang.substring( baseName.length()+1 );       // +1 to include the underscore
                
                Locale model;
                int underscorePos = lang.indexOf('_');
                if( underscorePos==-1 ) {
                    String language = lang;
                    model = new Locale( language );
                } else {
                    String language = lang.substring( 0, lang.indexOf('_') );
                    String country = lang.substring( lang.indexOf('_')+1 );
                    model = new Locale( language, country );
                }
                supportedLocales.add( model );
            }
        } catch(Exception e) {
            e.printStackTrace();
        }
       
        // Sort the list. Probably should use the current locale when getting the 
        // DisplayLanguage so the sort order is correct for the user.
        Collections.sort( supportedLocales, new Comparator() {
           public int compare(Object lhs, Object rhs) {
               Locale ll = (Locale)lhs;
               Locale rl = (Locale)rhs;
               return ll.getDisplayLanguage().compareTo( rl.getDisplayLanguage() );
           }
        });
        
        return supportedLocales;
    }

//    public static it.businesslogic.ireport.Language getLanguage(String language){
//        java.io.File myFiles[] = new java.io.File("lang").listFiles(new it.businesslogic.ireport.util.I18nFilenameFilter());
//        String filename = "";
//        java.util.Properties p = new java.util.Properties();
//        it.businesslogic.ireport.Language model = null;
//        for(int i = 0; i < java.util.Arrays.asList(myFiles).size(); i++) {
//            filename = myFiles[i].getName();
//            try{
//                p.load(new java.io.FileInputStream("lang"+java.io.File.separatorChar+filename));
//                if (!filename.equals(baseName+".properties") && !p.getProperty("LanguageName").equals("")
//                && p.getProperty("LanguageID").equals(language)) {
//                    model = new it.businesslogic.ireport.Language();
//                    model.setFilenameWithPath("lang"+java.io.File.separatorChar+filename);
//                    model.setFilename(filename);
//                    model.setLanguageName(p.getProperty("LanguageName"));
//                    model.setId(p.getProperty("LanguageID"));
//                    break;
//                }
//            }catch(Exception e){e.printStackTrace();}
//        }
//        return model;
//    }


    // Default to english
    private static Locale currentLocale = Locale.ENGLISH;
    
    public static void setCurrentLocale( String language ) {
    	setCurrentLocale(language, null);
    }

	public static void setCurrentLocale( String language, String country ) {
		if(language != null && !language.equals("")){
			if(country != null && !country.equals("")){
				setCurrentLocale(new java.util.Locale(language, country));
			}else{
				setCurrentLocale(new java.util.Locale(language));
			}
		}
	}

    public static void setCurrentLocale( Locale locale ) {
        currentLocale=locale;
        oLanguage = null;
        
        Enumeration enum_listeners = languageChangedListeners.elements();
        while (enum_listeners.hasMoreElements())
        {
            try {
                ((LanguageChangedListener)(enum_listeners.nextElement())).languageChanged(new LanguageChangedEvent(locale));
            } catch (Exception ex) {}
        }
    }
    
    public static Locale getCurrentLocale() {
        return currentLocale;
    }
    
    /**
     * Retreive a resource string using the current locale.
     * @param cID The resouce sting identifier
     * @return The locale specific string
     */ 
    public static String getString(String cID) {
        return getString(cID, currentLocale );
    }
    
    public static String getString(String cID,String defaultValue) {
        return getString(cID, currentLocale, defaultValue );
    }
        
    public static String getString(String cID, Locale currentLocale) {
        if(oLanguage == null){
            oLanguage = java.util.ResourceBundle.getBundle( localPackageName + baseName, 
                currentLocale);
        }
        return oLanguage.getString(cID);
    }
    
    public static String getString(String cID, Locale currentLocale, String defaultValue) {
        try {
        if(oLanguage == null){
            oLanguage = java.util.ResourceBundle.getBundle( localPackageName + baseName, 
                currentLocale);
        }
        return oLanguage.getString(cID);
        } catch (Exception ex) { 
            System.out.println("Exception loading cID = " + cID +": " + ex.getMessage());
        }
        return defaultValue; 
    }

    /** ErtanO 16.03.2004: not working currently as MainFrame is not accessible therefore we overgive languageid to getString() **/
    public static String getCurrentLocaleID(){
        //return it.businesslogic.ireport.gui.MainFrame.getProperties().getProperty("Language");
        return "";
    }
}