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Java > Open Source Codes > org > apache > tapestry > util > text > DefaultCharacterTranslatorSource


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.util.text;
16
17 import java.util.HashMap JavaDoc;
18 import java.util.Map JavaDoc;
19
20 /**
21  * The default implementation of a character translator source.
22  * Returns a standard HTML translator that encodes everything that is non-safe
23  * or an HTML translator that encodes only non-safe ASCII symbols
24  * if the encoding is a unicode one.
25  *
26  * @author mb
27  * @since 4.0
28  */
29 public class DefaultCharacterTranslatorSource implements ICharacterTranslatorSource
30 {
31     private static final ICharacterTranslator DEFAULT_TRANSLATOR = new MarkupCharacterTranslator();
32     private static final ICharacterTranslator UNICODE_TRANSLATOR = new MarkupCharacterTranslator(false);
33
34     private final static Map JavaDoc _translators;
35     
36     static {
37         _translators = new HashMap JavaDoc();
38         _translators.put("UTF-8", UNICODE_TRANSLATOR);
39         _translators.put("UTF-7", UNICODE_TRANSLATOR);
40         _translators.put("UTF-16", UNICODE_TRANSLATOR);
41         _translators.put("UTF-16BE", UNICODE_TRANSLATOR);
42         _translators.put("UTF-16LE", UNICODE_TRANSLATOR);
43     }
44     
45     /**
46      * Returns a translator that encodes all non-safe characters into their HTML equivalents.
47      *
48      * @see org.apache.tapestry.util.text.ICharacterTranslatorSource#getDefaultTranslator()
49      */
50     public ICharacterTranslator getDefaultTranslator() {
51         return DEFAULT_TRANSLATOR;
52     }
53
54     /**
55      * If the encoding is a Unicode one, returns a translator that encodes only the
56      * non-safe ASCII characters and leaves the others untouched.
57      * Otherwise, returns the default translator.
58      *
59      * @see org.apache.tapestry.util.text.ICharacterTranslatorSource#getTranslator(java.lang.String)
60      */
61     public ICharacterTranslator getTranslator(String JavaDoc encoding) {
62         ICharacterTranslator translator = (ICharacterTranslator) _translators.get(encoding.toUpperCase());
63         if (translator != null)
64             return translator;
65         return getDefaultTranslator();
66     }
67     
68 }
69
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