jars/icu4j-4_4_2-src/main/classes/translit/src/com/ibm/icu/text/RemoveTransliterator.java

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