jaxp/src/java.xml/share/classes/com/sun/org/apache/xml/internal/utils/LocaleUtility.java

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/*
 * 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,
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package com.sun.org.apache.xml.internal.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 );
    }



 }