KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > ibm > icu > text > UnicodeNameTransliterator


1 /*
2  * Copyright (C) 1996-2004, International Business Machines Corporation and
3  * others. All Rights Reserved.
4  */
5 package com.ibm.icu.text;
6 import com.ibm.icu.lang.*;
7
8 /**
9  * A transliterator that performs character to name mapping.
10  * It generates the Perl syntax \N{name}.
11  * @author Alan Liu
12  */
13 class UnicodeNameTransliterator extends Transliterator {
14
15     static final String JavaDoc _ID = "Any-Name";
16
17     static final String JavaDoc OPEN_DELIM = "\\N{";
18     static final char CLOSE_DELIM = '}';
19     static final int OPEN_DELIM_LEN = 3;
20
21     /**
22      * System registration hook.
23      */
24     static void register() {
25         Transliterator.registerFactory(_ID, new Transliterator.Factory() {
26             public Transliterator getInstance(String JavaDoc ID) {
27                 return new UnicodeNameTransliterator(null);
28             }
29         });
30     }
31
32     /**
33      * Constructs a transliterator.
34      */
35     public UnicodeNameTransliterator(UnicodeFilter filter) {
36         super(_ID, filter);
37     }
38
39     /**
40      * Implements {@link Transliterator#handleTransliterate}.
41      */
42     protected void handleTransliterate(Replaceable text,
43                                        Position offsets, boolean isIncremental) {
44         int cursor = offsets.start;
45         int limit = offsets.limit;
46         
47         StringBuffer JavaDoc str = new StringBuffer JavaDoc();
48         str.append(OPEN_DELIM);
49         int len;
50         String JavaDoc name;
51         
52         while (cursor < limit) {
53             int c = text.char32At(cursor);
54             if ((name=UCharacter.getExtendedName(c)) != null) {
55                 
56                 str.setLength(OPEN_DELIM_LEN);
57                 str.append(name).append(CLOSE_DELIM);
58
59                 int clen = UTF16.getCharCount(c);
60                 text.replace(cursor, cursor+clen, str.toString());
61                 len = str.length();
62                 cursor += len; // advance cursor by 1 and adjust for new text
63 limit += len-clen; // change in length
64 } else {
65                 ++cursor;
66             }
67         }
68
69         offsets.contextLimit += limit - offsets.limit;
70         offsets.limit = limit;
71         offsets.start = cursor;
72     }
73 }
74
Popular Tags