LocaleToCharsetMap


1   // Copyright (C) 1998-2001 by Jason Hunter <jhunter_AT_acm_DOT_org>.
2   // All rights reserved.  Use of this class is limited.
3   // Please see the LICENSE for more information.
4   
5   package com.oreilly.servlet;
6   
7   import java.util.*;
8   
9   /** 
10   * A mapping to determine the (somewhat arbitrarily) preferred charset for 
11   * a given locale.  Supports all locales recognized in JDK 1.1.  This
12   * class is used by the LocaleNegotiator.
13   *
14   * @see com.oreilly.servlet.LocaleNegotiator
15   *
16   * @author <b>Jason Hunter</b>, Copyright &#169; 1998
17   * @version 1.0, 98/09/18
18   */
19  public class LocaleToCharsetMap {
20  
21    private static Hashtable map;
22  
23    static {
24      map = new Hashtable();
25  
26      map.put("ar", "ISO-8859-6");
27      map.put("be", "ISO-8859-5");
28      map.put("bg", "ISO-8859-5");
29      map.put("ca", "ISO-8859-1");
30      map.put("cs", "ISO-8859-2");
31      map.put("da", "ISO-8859-1");
32      map.put("de", "ISO-8859-1");
33      map.put("el", "ISO-8859-7");
34      map.put("en", "ISO-8859-1");
35      map.put("es", "ISO-8859-1");
36      map.put("et", "ISO-8859-1");
37      map.put("fi", "ISO-8859-1");
38      map.put("fr", "ISO-8859-1");
39      map.put("hr", "ISO-8859-2");
40      map.put("hu", "ISO-8859-2");
41      map.put("is", "ISO-8859-1");
42      map.put("it", "ISO-8859-1");
43      map.put("iw", "ISO-8859-8");
44      map.put("ja", "Shift_JIS");
45      map.put("ko", "EUC-KR");     // Requires JDK 1.1.6
46      map.put("lt", "ISO-8859-2");
47      map.put("lv", "ISO-8859-2");
48      map.put("mk", "ISO-8859-5");
49      map.put("nl", "ISO-8859-1");
50      map.put("no", "ISO-8859-1");
51      map.put("pl", "ISO-8859-2");
52      map.put("pt", "ISO-8859-1");
53      map.put("ro", "ISO-8859-2");
54      map.put("ru", "ISO-8859-5");
55      map.put("sh", "ISO-8859-5");
56      map.put("sk", "ISO-8859-2");
57      map.put("sl", "ISO-8859-2");
58      map.put("sq", "ISO-8859-2");
59      map.put("sr", "ISO-8859-5");
60      map.put("sv", "ISO-8859-1");
61      map.put("tr", "ISO-8859-9");
62      map.put("uk", "ISO-8859-5");
63      map.put("zh", "GB2312");
64      map.put("zh_TW", "Big5");
65  
66    }
67  
68    /**
69     * Gets the preferred charset for the given locale, or null if the locale
70     * is not recognized.
71     *
72     * @param loc the locale
73     * @return the preferred charset
74     */
75    public static String   getCharset(Locale loc) {
76      String   charset;
77  
78      // Try for an full name match (may include country)
79      charset = (String  ) map.get(loc.toString());
80      if (charset != null) return charset;
81  
82      // If a full name didn't match, try just the language
83      charset = (String  ) map.get(loc.getLanguage());
84      return charset;  // may be null
85    }
86  }
87
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