LocaleUtils.java :  » J2EE » panther » org » lateralnz » common » util » Java Open Source

/* ====================================================================
 * The LateralNZ Software License, Version 1.0
 *
 * Copyright (c) 2003 LateralNZ.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by 
 *        LateralNZ (http://www.lateralnz.org/) and other third parties."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "LateralNZ" must not be used to endorse or promote 
 *    products derived from this software without prior written 
 *    permission. For written permission, please 
 *    contact oss@lateralnz.org.
 *
 * 5. Products derived from this software may not be called "Panther", 
 *    or "Lateral" or "LateralNZ", nor may "PANTHER" or "LATERAL" or 
 *    "LATERALNZ" appear in their name, without prior written 
 *    permission of LateralNZ.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of LateralNZ.  For more
 * information on Lateral, please see http://www.lateralnz.com/ or
 * http://www.lateralnz.org
 *
 */
package org.lateralnz.common.util;

import java.util.HashMap;
import java.util.Locale;

/**
 * utility class for caching locale objects
 *
 * @author J R Briggs
 */
public final class LocaleUtils implements Constants {
  private static HashMap locales         = new HashMap();

  private static final Locale get(String lang, String cty, String var) {
    Locale loc = new Locale((lang == null ? EMPTY : lang), (cty == null ? EMPTY : cty), (var == null ? EMPTY : var));

    synchronized (locales) {
      String key = getKey(lang, cty, var);
      if (!locales.containsKey(key)) {
        locales.put(key, loc);
      }
      else {
        loc = (Locale)locales.get(key);
      }
    }
    
    return loc;
  }
  
  private static final String getKey(String lang, String cty, String var) {
    lang = (lang == null ? lang = EMPTY : lang);
    cty = (cty == null ? cty = EMPTY : cty);
    var = (var == null ? var = EMPTY : var);
    
    return lang + UNDERSCORE + cty + UNDERSCORE + var;
  }
  
 /**
  * get a locale using the specified language, country and variant.
  * Note: if this is not found in the cache, it will be created
  */
  public static final Locale getLocale(String lang, String cty, String var) {
    String key = getKey(lang, cty, var);
    if (locales.containsKey(key)) {
      return (Locale)locales.get(key);
    }
    else {
      return get(lang, cty, var);
    }
  }
  
  public static final Locale getLocale(String fullkey) {
    if (locales.containsKey(fullkey)) {
      return (Locale)locales.get(fullkey);
    }
    else {
      String[] s = fullkey.split(UNDERSCORE, 3);
      if (s.length == 3) {
        return get(s[0], s[1], s[2]);
      }
      else if (s.length == 2) {
        return get(s[0], s[1], null);
      }
      else {
        return get(s[0], null, null);
      }
    }
  }
  
}