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


1 /*
2  *******************************************************************************
3  * Copyright (C) 1996-2004, International Business Machines Corporation and *
4  * others. All Rights Reserved. *
5  *******************************************************************************
6  */
7 package com.ibm.icu.text;
8
9
10 /**
11  * A transliterator that removes characters. This is useful in conjunction
12  * with a filter.
13  */
14 class RemoveTransliterator extends Transliterator {
15
16     /**
17      * ID for this transliterator.
18      */
19     private static String JavaDoc _ID = "Any-Remove";
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 RemoveTransliterator();
28             }
29         });
30         Transliterator.registerSpecialInverse("Remove", "Null", false);
31     }
32
33     /**
34      * Constructs a transliterator.
35      */
36     public RemoveTransliterator() {
37         super(_ID, null);
38     }
39
40     /**
41      * Implements {@link Transliterator#handleTransliterate}.
42      */
43     protected void handleTransliterate(Replaceable text,
44                                        Position index, boolean incremental) {
45         // Our caller (filteredTransliterate) has already narrowed us
46 // to an unfiltered run. Delete it.
47 text.replace(index.start, index.limit, "");
48         int len = index.limit - index.start;
49         index.contextLimit -= len;
50         index.limit -= len;
51     }
52 }
53
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