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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.vcard;
     18 
     19 import java.util.HashMap;
     20 import java.util.Map;
     21 
     22 /**
     23  * TextUtils especially for Japanese.
     24  */
     25 /* package */ class JapaneseUtils {
     26     static private final Map<Character, String> sHalfWidthMap =
     27         new HashMap<Character, String>();
     28 
     29     static {
     30         sHalfWidthMap.put('\u3001', "\uFF64");
     31         sHalfWidthMap.put('\u3002', "\uFF61");
     32         sHalfWidthMap.put('\u300C', "\uFF62");
     33         sHalfWidthMap.put('\u300D', "\uFF63");
     34         sHalfWidthMap.put('\u301C', "~");
     35         sHalfWidthMap.put('\u3041', "\uFF67");
     36         sHalfWidthMap.put('\u3042', "\uFF71");
     37         sHalfWidthMap.put('\u3043', "\uFF68");
     38         sHalfWidthMap.put('\u3044', "\uFF72");
     39         sHalfWidthMap.put('\u3045', "\uFF69");
     40         sHalfWidthMap.put('\u3046', "\uFF73");
     41         sHalfWidthMap.put('\u3047', "\uFF6A");
     42         sHalfWidthMap.put('\u3048', "\uFF74");
     43         sHalfWidthMap.put('\u3049', "\uFF6B");
     44         sHalfWidthMap.put('\u304A', "\uFF75");
     45         sHalfWidthMap.put('\u304B', "\uFF76");
     46         sHalfWidthMap.put('\u304C', "\uFF76\uFF9E");
     47         sHalfWidthMap.put('\u304D', "\uFF77");
     48         sHalfWidthMap.put('\u304E', "\uFF77\uFF9E");
     49         sHalfWidthMap.put('\u304F', "\uFF78");
     50         sHalfWidthMap.put('\u3050', "\uFF78\uFF9E");
     51         sHalfWidthMap.put('\u3051', "\uFF79");
     52         sHalfWidthMap.put('\u3052', "\uFF79\uFF9E");
     53         sHalfWidthMap.put('\u3053', "\uFF7A");
     54         sHalfWidthMap.put('\u3054', "\uFF7A\uFF9E");
     55         sHalfWidthMap.put('\u3055', "\uFF7B");
     56         sHalfWidthMap.put('\u3056', "\uFF7B\uFF9E");
     57         sHalfWidthMap.put('\u3057', "\uFF7C");
     58         sHalfWidthMap.put('\u3058', "\uFF7C\uFF9E");
     59         sHalfWidthMap.put('\u3059', "\uFF7D");
     60         sHalfWidthMap.put('\u305A', "\uFF7D\uFF9E");
     61         sHalfWidthMap.put('\u305B', "\uFF7E");
     62         sHalfWidthMap.put('\u305C', "\uFF7E\uFF9E");
     63         sHalfWidthMap.put('\u305D', "\uFF7F");
     64         sHalfWidthMap.put('\u305E', "\uFF7F\uFF9E");
     65         sHalfWidthMap.put('\u305F', "\uFF80");
     66         sHalfWidthMap.put('\u3060', "\uFF80\uFF9E");
     67         sHalfWidthMap.put('\u3061', "\uFF81");
     68         sHalfWidthMap.put('\u3062', "\uFF81\uFF9E");
     69         sHalfWidthMap.put('\u3063', "\uFF6F");
     70         sHalfWidthMap.put('\u3064', "\uFF82");
     71         sHalfWidthMap.put('\u3065', "\uFF82\uFF9E");
     72         sHalfWidthMap.put('\u3066', "\uFF83");
     73         sHalfWidthMap.put('\u3067', "\uFF83\uFF9E");
     74         sHalfWidthMap.put('\u3068', "\uFF84");
     75         sHalfWidthMap.put('\u3069', "\uFF84\uFF9E");
     76         sHalfWidthMap.put('\u306A', "\uFF85");
     77         sHalfWidthMap.put('\u306B', "\uFF86");
     78         sHalfWidthMap.put('\u306C', "\uFF87");
     79         sHalfWidthMap.put('\u306D', "\uFF88");
     80         sHalfWidthMap.put('\u306E', "\uFF89");
     81         sHalfWidthMap.put('\u306F', "\uFF8A");
     82         sHalfWidthMap.put('\u3070', "\uFF8A\uFF9E");
     83         sHalfWidthMap.put('\u3071', "\uFF8A\uFF9F");
     84         sHalfWidthMap.put('\u3072', "\uFF8B");
     85         sHalfWidthMap.put('\u3073', "\uFF8B\uFF9E");
     86         sHalfWidthMap.put('\u3074', "\uFF8B\uFF9F");
     87         sHalfWidthMap.put('\u3075', "\uFF8C");
     88         sHalfWidthMap.put('\u3076', "\uFF8C\uFF9E");
     89         sHalfWidthMap.put('\u3077', "\uFF8C\uFF9F");
     90         sHalfWidthMap.put('\u3078', "\uFF8D");
     91         sHalfWidthMap.put('\u3079', "\uFF8D\uFF9E");
     92         sHalfWidthMap.put('\u307A', "\uFF8D\uFF9F");
     93         sHalfWidthMap.put('\u307B', "\uFF8E");
     94         sHalfWidthMap.put('\u307C', "\uFF8E\uFF9E");
     95         sHalfWidthMap.put('\u307D', "\uFF8E\uFF9F");
     96         sHalfWidthMap.put('\u307E', "\uFF8F");
     97         sHalfWidthMap.put('\u307F', "\uFF90");
     98         sHalfWidthMap.put('\u3080', "\uFF91");
     99         sHalfWidthMap.put('\u3081', "\uFF92");
    100         sHalfWidthMap.put('\u3082', "\uFF93");
    101         sHalfWidthMap.put('\u3083', "\uFF6C");
    102         sHalfWidthMap.put('\u3084', "\uFF94");
    103         sHalfWidthMap.put('\u3085', "\uFF6D");
    104         sHalfWidthMap.put('\u3086', "\uFF95");
    105         sHalfWidthMap.put('\u3087', "\uFF6E");
    106         sHalfWidthMap.put('\u3088', "\uFF96");
    107         sHalfWidthMap.put('\u3089', "\uFF97");
    108         sHalfWidthMap.put('\u308A', "\uFF98");
    109         sHalfWidthMap.put('\u308B', "\uFF99");
    110         sHalfWidthMap.put('\u308C', "\uFF9A");
    111         sHalfWidthMap.put('\u308D', "\uFF9B");
    112         sHalfWidthMap.put('\u308E', "\uFF9C");
    113         sHalfWidthMap.put('\u308F', "\uFF9C");
    114         sHalfWidthMap.put('\u3090', "\uFF72");
    115         sHalfWidthMap.put('\u3091', "\uFF74");
    116         sHalfWidthMap.put('\u3092', "\uFF66");
    117         sHalfWidthMap.put('\u3093', "\uFF9D");
    118         sHalfWidthMap.put('\u309B', "\uFF9E");
    119         sHalfWidthMap.put('\u309C', "\uFF9F");
    120         sHalfWidthMap.put('\u30A1', "\uFF67");
    121         sHalfWidthMap.put('\u30A2', "\uFF71");
    122         sHalfWidthMap.put('\u30A3', "\uFF68");
    123         sHalfWidthMap.put('\u30A4', "\uFF72");
    124         sHalfWidthMap.put('\u30A5', "\uFF69");
    125         sHalfWidthMap.put('\u30A6', "\uFF73");
    126         sHalfWidthMap.put('\u30A7', "\uFF6A");
    127         sHalfWidthMap.put('\u30A8', "\uFF74");
    128         sHalfWidthMap.put('\u30A9', "\uFF6B");
    129         sHalfWidthMap.put('\u30AA', "\uFF75");
    130         sHalfWidthMap.put('\u30AB', "\uFF76");
    131         sHalfWidthMap.put('\u30AC', "\uFF76\uFF9E");
    132         sHalfWidthMap.put('\u30AD', "\uFF77");
    133         sHalfWidthMap.put('\u30AE', "\uFF77\uFF9E");
    134         sHalfWidthMap.put('\u30AF', "\uFF78");
    135         sHalfWidthMap.put('\u30B0', "\uFF78\uFF9E");
    136         sHalfWidthMap.put('\u30B1', "\uFF79");
    137         sHalfWidthMap.put('\u30B2', "\uFF79\uFF9E");
    138         sHalfWidthMap.put('\u30B3', "\uFF7A");
    139         sHalfWidthMap.put('\u30B4', "\uFF7A\uFF9E");
    140         sHalfWidthMap.put('\u30B5', "\uFF7B");
    141         sHalfWidthMap.put('\u30B6', "\uFF7B\uFF9E");
    142         sHalfWidthMap.put('\u30B7', "\uFF7C");
    143         sHalfWidthMap.put('\u30B8', "\uFF7C\uFF9E");
    144         sHalfWidthMap.put('\u30B9', "\uFF7D");
    145         sHalfWidthMap.put('\u30BA', "\uFF7D\uFF9E");
    146         sHalfWidthMap.put('\u30BB', "\uFF7E");
    147         sHalfWidthMap.put('\u30BC', "\uFF7E\uFF9E");
    148         sHalfWidthMap.put('\u30BD', "\uFF7F");
    149         sHalfWidthMap.put('\u30BE', "\uFF7F\uFF9E");
    150         sHalfWidthMap.put('\u30BF', "\uFF80");
    151         sHalfWidthMap.put('\u30C0', "\uFF80\uFF9E");
    152         sHalfWidthMap.put('\u30C1', "\uFF81");
    153         sHalfWidthMap.put('\u30C2', "\uFF81\uFF9E");
    154         sHalfWidthMap.put('\u30C3', "\uFF6F");
    155         sHalfWidthMap.put('\u30C4', "\uFF82");
    156         sHalfWidthMap.put('\u30C5', "\uFF82\uFF9E");
    157         sHalfWidthMap.put('\u30C6', "\uFF83");
    158         sHalfWidthMap.put('\u30C7', "\uFF83\uFF9E");
    159         sHalfWidthMap.put('\u30C8', "\uFF84");
    160         sHalfWidthMap.put('\u30C9', "\uFF84\uFF9E");
    161         sHalfWidthMap.put('\u30CA', "\uFF85");
    162         sHalfWidthMap.put('\u30CB', "\uFF86");
    163         sHalfWidthMap.put('\u30CC', "\uFF87");
    164         sHalfWidthMap.put('\u30CD', "\uFF88");
    165         sHalfWidthMap.put('\u30CE', "\uFF89");
    166         sHalfWidthMap.put('\u30CF', "\uFF8A");
    167         sHalfWidthMap.put('\u30D0', "\uFF8A\uFF9E");
    168         sHalfWidthMap.put('\u30D1', "\uFF8A\uFF9F");
    169         sHalfWidthMap.put('\u30D2', "\uFF8B");
    170         sHalfWidthMap.put('\u30D3', "\uFF8B\uFF9E");
    171         sHalfWidthMap.put('\u30D4', "\uFF8B\uFF9F");
    172         sHalfWidthMap.put('\u30D5', "\uFF8C");
    173         sHalfWidthMap.put('\u30D6', "\uFF8C\uFF9E");
    174         sHalfWidthMap.put('\u30D7', "\uFF8C\uFF9F");
    175         sHalfWidthMap.put('\u30D8', "\uFF8D");
    176         sHalfWidthMap.put('\u30D9', "\uFF8D\uFF9E");
    177         sHalfWidthMap.put('\u30DA', "\uFF8D\uFF9F");
    178         sHalfWidthMap.put('\u30DB', "\uFF8E");
    179         sHalfWidthMap.put('\u30DC', "\uFF8E\uFF9E");
    180         sHalfWidthMap.put('\u30DD', "\uFF8E\uFF9F");
    181         sHalfWidthMap.put('\u30DE', "\uFF8F");
    182         sHalfWidthMap.put('\u30DF', "\uFF90");
    183         sHalfWidthMap.put('\u30E0', "\uFF91");
    184         sHalfWidthMap.put('\u30E1', "\uFF92");
    185         sHalfWidthMap.put('\u30E2', "\uFF93");
    186         sHalfWidthMap.put('\u30E3', "\uFF6C");
    187         sHalfWidthMap.put('\u30E4', "\uFF94");
    188         sHalfWidthMap.put('\u30E5', "\uFF6D");
    189         sHalfWidthMap.put('\u30E6', "\uFF95");
    190         sHalfWidthMap.put('\u30E7', "\uFF6E");
    191         sHalfWidthMap.put('\u30E8', "\uFF96");
    192         sHalfWidthMap.put('\u30E9', "\uFF97");
    193         sHalfWidthMap.put('\u30EA', "\uFF98");
    194         sHalfWidthMap.put('\u30EB', "\uFF99");
    195         sHalfWidthMap.put('\u30EC', "\uFF9A");
    196         sHalfWidthMap.put('\u30ED', "\uFF9B");
    197         sHalfWidthMap.put('\u30EE', "\uFF9C");
    198         sHalfWidthMap.put('\u30EF', "\uFF9C");
    199         sHalfWidthMap.put('\u30F0', "\uFF72");
    200         sHalfWidthMap.put('\u30F1', "\uFF74");
    201         sHalfWidthMap.put('\u30F2', "\uFF66");
    202         sHalfWidthMap.put('\u30F3', "\uFF9D");
    203         sHalfWidthMap.put('\u30F4', "\uFF73\uFF9E");
    204         sHalfWidthMap.put('\u30F5', "\uFF76");
    205         sHalfWidthMap.put('\u30F6', "\uFF79");
    206         sHalfWidthMap.put('\u30FB', "\uFF65");
    207         sHalfWidthMap.put('\u30FC', "\uFF70");
    208         sHalfWidthMap.put('\uFF01', "!");
    209         sHalfWidthMap.put('\uFF02', "\"");
    210         sHalfWidthMap.put('\uFF03', "#");
    211         sHalfWidthMap.put('\uFF04', "$");
    212         sHalfWidthMap.put('\uFF05', "%");
    213         sHalfWidthMap.put('\uFF06', "&");
    214         sHalfWidthMap.put('\uFF07', "'");
    215         sHalfWidthMap.put('\uFF08', "(");
    216         sHalfWidthMap.put('\uFF09', ")");
    217         sHalfWidthMap.put('\uFF0A', "*");
    218         sHalfWidthMap.put('\uFF0B', "+");
    219         sHalfWidthMap.put('\uFF0C', ",");
    220         sHalfWidthMap.put('\uFF0D', "-");
    221         sHalfWidthMap.put('\uFF0E', ".");
    222         sHalfWidthMap.put('\uFF0F', "/");
    223         sHalfWidthMap.put('\uFF10', "0");
    224         sHalfWidthMap.put('\uFF11', "1");
    225         sHalfWidthMap.put('\uFF12', "2");
    226         sHalfWidthMap.put('\uFF13', "3");
    227         sHalfWidthMap.put('\uFF14', "4");
    228         sHalfWidthMap.put('\uFF15', "5");
    229         sHalfWidthMap.put('\uFF16', "6");
    230         sHalfWidthMap.put('\uFF17', "7");
    231         sHalfWidthMap.put('\uFF18', "8");
    232         sHalfWidthMap.put('\uFF19', "9");
    233         sHalfWidthMap.put('\uFF1A', ":");
    234         sHalfWidthMap.put('\uFF1B', ";");
    235         sHalfWidthMap.put('\uFF1C', "<");
    236         sHalfWidthMap.put('\uFF1D', "=");
    237         sHalfWidthMap.put('\uFF1E', ">");
    238         sHalfWidthMap.put('\uFF1F', "?");
    239         sHalfWidthMap.put('\uFF20', "@");
    240         sHalfWidthMap.put('\uFF21', "A");
    241         sHalfWidthMap.put('\uFF22', "B");
    242         sHalfWidthMap.put('\uFF23', "C");
    243         sHalfWidthMap.put('\uFF24', "D");
    244         sHalfWidthMap.put('\uFF25', "E");
    245         sHalfWidthMap.put('\uFF26', "F");
    246         sHalfWidthMap.put('\uFF27', "G");
    247         sHalfWidthMap.put('\uFF28', "H");
    248         sHalfWidthMap.put('\uFF29', "I");
    249         sHalfWidthMap.put('\uFF2A', "J");
    250         sHalfWidthMap.put('\uFF2B', "K");
    251         sHalfWidthMap.put('\uFF2C', "L");
    252         sHalfWidthMap.put('\uFF2D', "M");
    253         sHalfWidthMap.put('\uFF2E', "N");
    254         sHalfWidthMap.put('\uFF2F', "O");
    255         sHalfWidthMap.put('\uFF30', "P");
    256         sHalfWidthMap.put('\uFF31', "Q");
    257         sHalfWidthMap.put('\uFF32', "R");
    258         sHalfWidthMap.put('\uFF33', "S");
    259         sHalfWidthMap.put('\uFF34', "T");
    260         sHalfWidthMap.put('\uFF35', "U");
    261         sHalfWidthMap.put('\uFF36', "V");
    262         sHalfWidthMap.put('\uFF37', "W");
    263         sHalfWidthMap.put('\uFF38', "X");
    264         sHalfWidthMap.put('\uFF39', "Y");
    265         sHalfWidthMap.put('\uFF3A', "Z");
    266         sHalfWidthMap.put('\uFF3B', "[");
    267         sHalfWidthMap.put('\uFF3C', "\\");
    268         sHalfWidthMap.put('\uFF3D', "]");
    269         sHalfWidthMap.put('\uFF3E', "^");
    270         sHalfWidthMap.put('\uFF3F', "_");
    271         sHalfWidthMap.put('\uFF41', "a");
    272         sHalfWidthMap.put('\uFF42', "b");
    273         sHalfWidthMap.put('\uFF43', "c");
    274         sHalfWidthMap.put('\uFF44', "d");
    275         sHalfWidthMap.put('\uFF45', "e");
    276         sHalfWidthMap.put('\uFF46', "f");
    277         sHalfWidthMap.put('\uFF47', "g");
    278         sHalfWidthMap.put('\uFF48', "h");
    279         sHalfWidthMap.put('\uFF49', "i");
    280         sHalfWidthMap.put('\uFF4A', "j");
    281         sHalfWidthMap.put('\uFF4B', "k");
    282         sHalfWidthMap.put('\uFF4C', "l");
    283         sHalfWidthMap.put('\uFF4D', "m");
    284         sHalfWidthMap.put('\uFF4E', "n");
    285         sHalfWidthMap.put('\uFF4F', "o");
    286         sHalfWidthMap.put('\uFF50', "p");
    287         sHalfWidthMap.put('\uFF51', "q");
    288         sHalfWidthMap.put('\uFF52', "r");
    289         sHalfWidthMap.put('\uFF53', "s");
    290         sHalfWidthMap.put('\uFF54', "t");
    291         sHalfWidthMap.put('\uFF55', "u");
    292         sHalfWidthMap.put('\uFF56', "v");
    293         sHalfWidthMap.put('\uFF57', "w");
    294         sHalfWidthMap.put('\uFF58', "x");
    295         sHalfWidthMap.put('\uFF59', "y");
    296         sHalfWidthMap.put('\uFF5A', "z");
    297         sHalfWidthMap.put('\uFF5B', "{");
    298         sHalfWidthMap.put('\uFF5C', "|");
    299         sHalfWidthMap.put('\uFF5D', "}");
    300         sHalfWidthMap.put('\uFF5E', "~");
    301         sHalfWidthMap.put('\uFF61', "\uFF61");
    302         sHalfWidthMap.put('\uFF62', "\uFF62");
    303         sHalfWidthMap.put('\uFF63', "\uFF63");
    304         sHalfWidthMap.put('\uFF64', "\uFF64");
    305         sHalfWidthMap.put('\uFF65', "\uFF65");
    306         sHalfWidthMap.put('\uFF66', "\uFF66");
    307         sHalfWidthMap.put('\uFF67', "\uFF67");
    308         sHalfWidthMap.put('\uFF68', "\uFF68");
    309         sHalfWidthMap.put('\uFF69', "\uFF69");
    310         sHalfWidthMap.put('\uFF6A', "\uFF6A");
    311         sHalfWidthMap.put('\uFF6B', "\uFF6B");
    312         sHalfWidthMap.put('\uFF6C', "\uFF6C");
    313         sHalfWidthMap.put('\uFF6D', "\uFF6D");
    314         sHalfWidthMap.put('\uFF6E', "\uFF6E");
    315         sHalfWidthMap.put('\uFF6F', "\uFF6F");
    316         sHalfWidthMap.put('\uFF70', "\uFF70");
    317         sHalfWidthMap.put('\uFF71', "\uFF71");
    318         sHalfWidthMap.put('\uFF72', "\uFF72");
    319         sHalfWidthMap.put('\uFF73', "\uFF73");
    320         sHalfWidthMap.put('\uFF74', "\uFF74");
    321         sHalfWidthMap.put('\uFF75', "\uFF75");
    322         sHalfWidthMap.put('\uFF76', "\uFF76");
    323         sHalfWidthMap.put('\uFF77', "\uFF77");
    324         sHalfWidthMap.put('\uFF78', "\uFF78");
    325         sHalfWidthMap.put('\uFF79', "\uFF79");
    326         sHalfWidthMap.put('\uFF7A', "\uFF7A");
    327         sHalfWidthMap.put('\uFF7B', "\uFF7B");
    328         sHalfWidthMap.put('\uFF7C', "\uFF7C");
    329         sHalfWidthMap.put('\uFF7D', "\uFF7D");
    330         sHalfWidthMap.put('\uFF7E', "\uFF7E");
    331         sHalfWidthMap.put('\uFF7F', "\uFF7F");
    332         sHalfWidthMap.put('\uFF80', "\uFF80");
    333         sHalfWidthMap.put('\uFF81', "\uFF81");
    334         sHalfWidthMap.put('\uFF82', "\uFF82");
    335         sHalfWidthMap.put('\uFF83', "\uFF83");
    336         sHalfWidthMap.put('\uFF84', "\uFF84");
    337         sHalfWidthMap.put('\uFF85', "\uFF85");
    338         sHalfWidthMap.put('\uFF86', "\uFF86");
    339         sHalfWidthMap.put('\uFF87', "\uFF87");
    340         sHalfWidthMap.put('\uFF88', "\uFF88");
    341         sHalfWidthMap.put('\uFF89', "\uFF89");
    342         sHalfWidthMap.put('\uFF8A', "\uFF8A");
    343         sHalfWidthMap.put('\uFF8B', "\uFF8B");
    344         sHalfWidthMap.put('\uFF8C', "\uFF8C");
    345         sHalfWidthMap.put('\uFF8D', "\uFF8D");
    346         sHalfWidthMap.put('\uFF8E', "\uFF8E");
    347         sHalfWidthMap.put('\uFF8F', "\uFF8F");
    348         sHalfWidthMap.put('\uFF90', "\uFF90");
    349         sHalfWidthMap.put('\uFF91', "\uFF91");
    350         sHalfWidthMap.put('\uFF92', "\uFF92");
    351         sHalfWidthMap.put('\uFF93', "\uFF93");
    352         sHalfWidthMap.put('\uFF94', "\uFF94");
    353         sHalfWidthMap.put('\uFF95', "\uFF95");
    354         sHalfWidthMap.put('\uFF96', "\uFF96");
    355         sHalfWidthMap.put('\uFF97', "\uFF97");
    356         sHalfWidthMap.put('\uFF98', "\uFF98");
    357         sHalfWidthMap.put('\uFF99', "\uFF99");
    358         sHalfWidthMap.put('\uFF9A', "\uFF9A");
    359         sHalfWidthMap.put('\uFF9B', "\uFF9B");
    360         sHalfWidthMap.put('\uFF9C', "\uFF9C");
    361         sHalfWidthMap.put('\uFF9D', "\uFF9D");
    362         sHalfWidthMap.put('\uFF9E', "\uFF9E");
    363         sHalfWidthMap.put('\uFF9F', "\uFF9F");
    364         sHalfWidthMap.put('\uFFE5', "\u005C\u005C");
    365     }
    366 
    367     /**
    368      * Returns half-width version of that character if possible. Returns null if not possible
    369      * @param ch input character
    370      * @return CharSequence object if the mapping for ch exists. Return null otherwise.
    371      */
    372     public static String tryGetHalfWidthText(final char ch) {
    373         if (sHalfWidthMap.containsKey(ch)) {
    374             return sHalfWidthMap.get(ch);
    375         } else {
    376             return null;
    377         }
    378     }
    379 }
    380