i18nutil.java

sun公司的petstore,一个J2ee的示例应用程序.

/*
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution 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.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
 * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
 * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
 * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
 * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of
 * any nuclear facility.
 */

package com.sun.j2ee.blueprints.waf.util;

import java.util.Locale;
import java.util.Vector;
import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.text.BreakIterator;
import java.util.Locale;
import java.io.ByteArrayOutputStream;


import com.sun.j2ee.blueprints.util.tracer.Debug;

/**
 * This utility class for internationalization. This class provides a
 * central location to do specialized formatting in both
 * a default and a locale specfic manner.
 */
public final class I18nUtil extends Object {


    /**
     * Converts a String SJIS or JIS URL encoded hex encoding to a Unicode String
     *
    */
    public static String convertJISEncoding(String target) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        if (target == null) return null;
        String paramString = target.trim();

        for (int loop =0; loop < paramString.length(); loop++) {
            int i = (int)paramString.charAt(loop);
            bos.write(i);
        }
        String convertedString = null;
        try {
            convertedString =  new String(bos.toByteArray(), "JISAutoDetect");
        } catch (java.io.UnsupportedEncodingException uex) {}
        return convertedString;
    }


  public static String formatCurrency(double amount, int precision, String pattern, Locale locale){
        NumberFormat nf = NumberFormat.getCurrencyInstance(locale);
        DecimalFormat df = (DecimalFormat)nf;
        df.setMinimumFractionDigits(precision);
        df.setMaximumFractionDigits(precision);
        df.setDecimalSeparatorAlwaysShown(true);
        df.applyPattern(pattern);
        return df.format(amount);
    }

    public static String formatNumber(double amount, int precision, String pattern, Locale locale){
        NumberFormat nf = NumberFormat.getNumberInstance(locale);
        DecimalFormat df = (DecimalFormat)nf;
        df.setMinimumFractionDigits(precision);
        df.setMaximumFractionDigits(precision);
        df.setDecimalSeparatorAlwaysShown(true);
        df.applyPattern(pattern);
        return df.format(amount);
    }

    public static String formatCurrency(double amount, int precision, Locale locale){
        NumberFormat nf = NumberFormat.getCurrencyInstance(locale);
        nf.setMinimumFractionDigits(precision);
        nf.setMaximumFractionDigits(precision);
        return nf.format(amount);
    }

    public static String formatNumber(double amount, int precision, Locale locale){
        NumberFormat nf = NumberFormat.getNumberInstance(locale);
        nf.setMinimumFractionDigits(precision);
        nf.setMaximumFractionDigits(precision);
        return nf.format(amount);
    }

    public static Vector parseKeywords(String keywordString){
        if (keywordString != null){
            Vector keywords = new Vector();
            BreakIterator breakIt = BreakIterator.getWordInstance();
            int index=0;
            int previousIndex =0;
            breakIt.setText(keywordString);
            try{
                while(index < keywordString.length()){
                    previousIndex = index;
                    index = breakIt.next();
                    String word = keywordString.substring(previousIndex, index);
                    if (!word.trim().equals("")) keywords.addElement(word);
                }
                return keywords;
            } catch (Throwable e){
                Debug.print(e, "Error while parsing search string");
            }
        }
        return null;
    }

    public static Vector parseKeywords(String keywordString, Locale locale){
        if (keywordString != null){
            Vector keywords = new Vector();
            BreakIterator breakIt = BreakIterator.getWordInstance(locale);
            int index=0;
            int previousIndex =0;
            breakIt.setText(keywordString);
            try{
                while(index < keywordString.length()){
                    previousIndex = index;
                    index = breakIt.next();
                    String word = keywordString.substring(previousIndex, index);
                    if (!word.trim().equals("")) keywords.addElement(word);
                }
                return keywords;
            } catch (Throwable e){
                Debug.print(e, "Error while parsing search string" );
            }

        }
        return null;
    }

    /**
     * Convert a string based locale into a Locale Object
     * <br>
     * <br>Strings are formatted:
     * <br>
     * <br>language_contry_variant
     *
     **/

    public static Locale getLocaleFromString(String localeString) {
        if (localeString == null) return null;
        if (localeString.toLowerCase().equals("default")) return Locale.getDefault();
        int languageIndex = localeString.indexOf('_');
        if (languageIndex  == -1) return null;
        int countryIndex = localeString.indexOf('_', languageIndex +1);
        String country = null;
        if (countryIndex  == -1) {
            if (localeString.length() > languageIndex) {
                country = localeString.substring(languageIndex +1, localeString.length());
            } else {
                return null;
            }
        }
        int variantIndex = -1;
        if (countryIndex != -1) countryIndex = localeString.indexOf('_', countryIndex +1);
        String language = localeString.substring(0, languageIndex);
        String variant = null;
        if (variantIndex  != -1) {

            variant = localeString.substring(variantIndex +1, localeString.length());
        }
        if (variant != null) {
            return new Locale(language, country, variant);
        } else {
            return new Locale(language, country);
        }

    }
}