

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id$
 */

package org.apache.xml.utils;

import java.util.Locale;

/**
 * @author Igor Hersht, igorh@ca.ibm.com
 */
public class LocaleUtility {
    /**
     * IETF RFC 1766 tag separator
     */
    public final static char IETF_SEPARATOR = '-';  
    public final static String EMPTY_STRING = ""; 
    
   
 public static Locale langToLocale(String lang) {
       if((lang == null) || lang.equals(EMPTY_STRING)){ // not specified => getDefault
            return Locale.getDefault();
       }
        String language = EMPTY_STRING;
        String country =  EMPTY_STRING;
        String variant =  EMPTY_STRING;

        int i1 = lang.indexOf(IETF_SEPARATOR);
        if (i1 < 0) {
            language = lang;
        } else {
            language = lang.substring(0, i1);
            ++i1;
            int i2 = lang.indexOf(IETF_SEPARATOR, i1);
            if (i2 < 0) {
                country = lang.substring(i1);
            } else {
                country = lang.substring(i1, i2);
                variant = lang.substring(i2+1);
            }
        }
        
        if(language.length() == 2){
           language = language.toLowerCase();
        }else {
          language = EMPTY_STRING;
        }
        
        if(country.length() == 2){
           country = country.toUpperCase();
        }else {
          country = EMPTY_STRING;
        }
        
        if((variant.length() > 0) && 
        ((language.length() == 2) ||(country.length() == 2))){
           variant = variant.toUpperCase();
        }else{
            variant = EMPTY_STRING;
        }
             
        return new Locale(language, country, variant );
    }
    
  
   
 }