org.apache.myfaces.shared_tomahawk.util.LocaleUtils Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of tomahawk21 Show documentation
JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.
The newest version!
/*
 * 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.
 */
package org.apache.myfaces.shared_tomahawk.util;

import java.util.Locale;
import java.util.StringTokenizer;
import java.util.logging.Level;
import java.util.logging.Logger;


/**
 * @author Anton Koinov (latest modification by $Author: lu4242 $)
 * @version $Revision: 1305679 $ $Date: 2012-03-26 18:42:04 -0500 (Mon, 26 Mar 2012) $
 */
public final class LocaleUtils
{
    //private static final Log log = LogFactory.getLog(LocaleUtils.class);
    private static final Logger log = Logger.getLogger(LocaleUtils.class.getName());

    /** Utility class, do not instatiate */
    private LocaleUtils()
    {
        // utility class, do not instantiate
    }

    /**
     * Converts a locale string to Locale class. Accepts both
     * '_' and '-' as separators for locale components.
     *
     * @param localeString string representation of a locale
     * @return Locale instance, compatible with the string representation
     */
    public static Locale toLocale(String localeString)
    {
        if ((localeString == null) || (localeString.length() == 0))
        {
            Locale locale = Locale.getDefault();
            if(log.isLoggable(Level.WARNING))
            {
                log.warning("Locale name in faces-config.xml null or empty, setting locale to default locale : "
                        + locale.toString());
            }
            return locale;
        }

        int separatorCountry = localeString.indexOf('_');
        char separator;
        if (separatorCountry >= 0)
        {
            separator = '_';
        }
        else
        {
            separatorCountry = localeString.indexOf('-');
            separator = '-';
        }

        String language;
        String country;
        String variant;
        if (separatorCountry < 0)
        {
            language = localeString;
            country = "";
            variant = "";
        }
        else
        {
            language = localeString.substring(0, separatorCountry);

            int separatorVariant = localeString.indexOf(separator, separatorCountry + 1);
            if (separatorVariant < 0)
            {
                country = localeString.substring(separatorCountry + 1);
                variant = "";
            }
            else
            {
                country = localeString.substring(separatorCountry + 1, separatorVariant);
                variant = localeString.substring(separatorVariant + 1);
            }
        }

        return new Locale(language, country, variant);
    }


    /**
     * Convert locale string used by converter tags to locale.
     *
     * @param name name of the locale
     * @return locale specified by the given String
     *
     * @see org.apache.myfaces.taglib.core.ConvertDateTimeTag#setConverterLocale
     * @see org.apache.myfaces.taglib.core.ConvertNumberTag#setConverterLocale
     */
    public static Locale converterTagLocaleFromString(String name)
    {
        try
        {
            Locale locale;
            StringTokenizer st = new StringTokenizer(name, "_");
            String language = st.nextToken();

            if(st.hasMoreTokens())
            {
                String country = st.nextToken();

                if(st.hasMoreTokens())
                {
                    String variant = st.nextToken();
                    locale = new Locale(language, country, variant);
                }
                else
                {
                    locale = new Locale(language, country);
                }
            }
            else
            {
                locale = new Locale(language);
            }


            return locale;
        }
        catch(Exception e)
        {
            throw new IllegalArgumentException("Locale parsing exception - " +
                "invalid string representation '" + name + "'");
        }
    }
}