eventresourcebundle.java

一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码

/*
 *    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.
 */

 /**
  * Title: XELOPES Data Mining Library
  * Description: The XELOPES library is an open platform-independent and data-source-independent library for Embedded Data Mining.
  * Copyright: Copyright (c) 2002-2004 prudsys AG
  * Company: ZSoft (www.zsoft.ru), Prudsys (www.prudsys.com)
  * @author Toni Volkmer
  * @version 1.0
  */

package com.prudsys.pdm.Core.Event;

import java.io.InputStream;
import java.io.IOException;

import java.util.Locale;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;

/**
 * This class load the ResourceBundle for the specified locale settings.
 * 
 * @author Toni Volkmer
 */
public abstract class EventResourceBundle extends ResourceBundle {
  /**
   * Returns bundle with the specified locale if possible.
   * 
   * @param baseName base name
   * @param locale language settings
   * @param loader instance of ClassLoader
   * @return instance of ResourceBundle, null if none could be found for baseName
   */
  public static ResourceBundle getBundle(String baseName, Locale locale, ClassLoader loader)  {
    if (baseName==null || loader == null)
      throw new NullPointerException();

    ResourceBundle bundle = testBundles(baseName, locale, loader);
    if(bundle==null)
      throw new NullPointerException();

    return bundle;
  }

  /**
   * Returns bundle with the specified locale if possible.
   * First a bundle with the specified locale will be searched for.
   * The default locale will only be used, if the supplied locale is null.  
   * 
   * 
   * @param baseName base name
   * @param locale locale to be used, if null default locale will be used
   * @param loader class loader
   * @return instance of ResourceBundle, null if none could be found for baseName
   */
  private static ResourceBundle testBundles(String baseName, Locale locale, ClassLoader loader) {
    if(locale==null) {
      locale = Locale.getDefault();
    }

    try {
      InputStream stream;
      String complete = baseName + "_" + locale.toString();
      stream = getBundleInputStream(loader, complete);
      if (stream != null)
        return new PropertyResourceBundle(stream);
    }
    catch(IOException ex) {
    }

    try {
      InputStream stream;
      String langCoun = baseName + "_" + locale.getLanguage() + "_" + locale.getCountry();
      stream = getBundleInputStream(loader, langCoun);
      if (stream != null)
        return new PropertyResourceBundle(stream);
    }
    catch(IOException ex) {
    }

    try {
      InputStream stream;
      String lang = baseName + "_" + locale.getLanguage();
      stream = getBundleInputStream(loader, lang);
      if (stream != null)
        return new PropertyResourceBundle(stream);
    }
    catch(IOException ex) {
    }

    try {
      InputStream stream;
      stream = getBundleInputStream(loader, baseName);
      if (stream != null)
        return new PropertyResourceBundle(stream);
    }
    catch(IOException ex) {
    }

    return null;
  }

  private static InputStream getBundleInputStream(ClassLoader loader, String name) {
    String resourceName = name.replace('.','/') + ".properties";
    try {
      InputStream stream = loader.getResourceAsStream(resourceName);
      if(stream!=null)
        return new java.io.BufferedInputStream(stream);
    }
    catch (Exception ex) {
    }
    return null;
  }
}