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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
  * 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.catalina.util;
Utility class that attempts to map from a Locale to the corresponding character set to be used for interpreting input text (or generating output text) when the Content-Type header does not include one. You can customize the behavior of this class by modifying the mapping data it loads, or by subclassing it (to change the algorithm) and then using your own version for a particular web application.

Craig R. McClanahan
$Date: 2008-03-17 22:02:23 +0100 (Mon, 17 Mar 2008) $ $Version$
 public class CharsetMapper {
     // ---------------------------------------------------- Manifest Constants

Default properties resource name.
     public static final String DEFAULT_RESOURCE =
     // ---------------------------------------------------------- Constructors

Construct a new CharsetMapper using the default properties resource.
     public CharsetMapper() {

Construct a new CharsetMapper using the specified properties resource.

name Name of a properties resource to be loaded
java.lang.IllegalArgumentException if the specified properties resource could not be loaded for any reason.
     public CharsetMapper(String name) {
         try {
             InputStream stream =
         } catch (Throwable t) {
             throw new IllegalArgumentException(t.toString());
     // ---------------------------------------------------- Instance Variables

The mapping properties that have been initialized from the specified or default properties resource.
     private Properties map = new Properties();
     // ------------------------------------------------------- Public Methods

Calculate the name of a character set to be assumed, given the specified Locale and the absence of a character set specified as part of the content type header.

locale The locale for which to calculate a character set
    public String getCharset(Locale locale) {
        // Match full language_country_variant first, then language_country, 
        // then language only
        String charset = .getProperty(locale.toString());
        if (charset == null) {
            charset = .getProperty(locale.getLanguage() + "_" 
                    + locale.getCountry());
            if (charset == null) {
                charset = .getProperty(locale.getLanguage());
        return (charset);

The deployment descriptor can have a locale-encoding-mapping-list element which describes the webapp's desired mapping from locale to charset. This method gets called when processing the web.xml file for a context

locale The locale for a character set
charset The charset to be associated with the locale
    public void addCharsetMappingFromDeploymentDescriptor(String localeString charset) {
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