LanguageManager.java :  » Music » TuxGuitar-1.2 » org » herac » tuxguitar » gui » system » language » Java Open Source

/*
 * Created on 09-ene-2006
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package org.herac.tuxguitar.gui.system.language;

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;

import org.herac.tuxguitar.gui.util.TGFileUtils;

/**
 * @author julian
 * 
 */
public class LanguageManager {
  
  public static final String PACKAGE = "lang";
  public static final String PREFIX = "messages";
  public static final String EXTENSION = ".properties";
  
  private TGResourceBundle resources;
  private String[] languages;
  private List loaders;
  
  public LanguageManager() {
    this.loaders = new ArrayList();
    this.loadLanguages();
  }
  
  public void addLoader(LanguageLoader loader){
    if( !this.loaders.contains( loader )){
      this.loaders.add(loader);
    }
  }
  
  public void removeLoader(LanguageLoader loader){
    if( this.loaders.contains( loader )){
      this.loaders.remove(loader);
    }
  }
  
  private void fireChanges(){
    Iterator it = this.loaders.iterator();
    while(it.hasNext()){
      LanguageLoader loader = (LanguageLoader)it.next();
      loader.loadProperties();
    }
  }
  
  public void setLanguage(String lang) {
    try {
      String baseName = (PACKAGE + "." + PREFIX);
      Locale locale = getLocale(lang);
      this.resources = TGResourceBundle.getBundle(baseName, locale);
      this.fireChanges();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  
  private Locale getLocale(String lang){
    if(this.isSupportedLanguage(lang)){
      String[] locale = lang.split("_");
      String language = (locale.length > 0 ? locale[0] : "" );
      String country =  (locale.length > 1 ? locale[1] : "" );
      String variant =  (locale.length > 2 ? locale[2] : "" );
      return new Locale(language, country, variant);
    }
    return Locale.getDefault();
  }
  
  private boolean isSupportedLanguage(String lang){
    if(lang != null && lang.length() > 0 && this.languages != null){
      for(int i = 0 ; i < this.languages.length; i ++){
        if(this.languages[i].equals(lang)){
          return true;
        }
      }
    }
    return false;
  }
  
  public String getProperty(String key,String value) {
    try {
      String property = this.resources.getString(key);
      return (property == null ? value : property );
    }catch(Throwable throwable){
      return value;
    }
  }
  
  public String getProperty(String key) {
    return this.getProperty(key,key);
  }
  
  public String getProperty(String key, Object[] arguments) {
    return getProperty(key,key,arguments);
  }
  
  public String getProperty(String key,String value, Object[] arguments) {
    String property = this.getProperty(key,value);
    return ( arguments != null ? MessageFormat.format(property, arguments) : property );
  }
  
  public String[] getLanguages() {
    return this.languages;
  }
  
  public String getLanguage() {
    if(this.resources != null){
      Locale locale = this.resources.getLocale();
      boolean language = (locale.getLanguage() != null && locale.getLanguage().length() > 0);
      boolean country = (locale.getCountry() != null && locale.getCountry().length() > 0);
      boolean variant = (locale.getVariant() != null && locale.getVariant().length() > 0);
      
      String localeId = new String();
      if( language ){
        localeId += locale.getLanguage();
      }
      if( country ){
        localeId += "_" + locale.getCountry();
      }
      if( variant ){
        localeId += "_" + ( country ? locale.getVariant() : ("_" + locale.getVariant()) );
      }
      return localeId;
    }
    return null;
  }
  
  /**
   * Load language files from lang folder
   *
   */
  private void loadLanguages(){
    List availableList = new ArrayList();
    String[] fileNames = TGFileUtils.getFileNames("lang");
    if( fileNames != null ){
      // now iterate over them
      for(int i = 0;i < fileNames.length;i++){
        if (fileNames[i].indexOf("messages_") == 0){
          int prefixIndex = fileNames[i].indexOf(PREFIX + "_");
          int extensionIndex = fileNames[i].indexOf(EXTENSION);
          if(prefixIndex == 0 && extensionIndex > (PREFIX + "_").length()){
            availableList.add( fileNames[i].substring( (PREFIX + "_").length() , extensionIndex ) );
          }
        }
      }
    }
    this.languages = new String[availableList.size()];
    for(int i = 0; i < this.languages.length; i++){
      this.languages[i] = (String) availableList.get( i );
    }
  }
}