Japanize変換

gistfile1.java

/*
 * @author     ucchy
 * @license    GPLv3
 * @copyright  Copyright ucchy 2013
 */
package test;

import java.util.HashMap;

/**
 * @author ucchy
 * ローマ字からかな文字へ変換するクラス
 */
public class Kana {

    private static final HashMap<String, String[]> TABLE;
    static {
        TABLE = new HashMap<String, String[]>();
        TABLE.put(  "", new String[]{"あ","い","う","え","お"});
        TABLE.put( "k", new String[]{"か","き","く","け","こ"});
        TABLE.put( "s", new String[]{"さ","し","す","せ","そ"});
        TABLE.put( "t", new String[]{"た","ち","つ","て","と"});
        TABLE.put( "n", new String[]{"な","に","ぬ","ね","の"});
        TABLE.put( "h", new String[]{"は","ひ","ふ","へ","ほ"});
        TABLE.put( "m", new String[]{"ま","み","む","め","も"});
        TABLE.put( "y", new String[]{"や","い","ゆ","いぇ","よ"});
        TABLE.put( "r", new String[]{"ら","り","る","れ","ろ"});
        TABLE.put( "w", new String[]{"わ","うぃ","う","うぇ","を"});
        TABLE.put( "g", new String[]{"が","ぎ","ぐ","げ","ご"});
        TABLE.put( "z", new String[]{"ざ","じ","ず","ぜ","ぞ"});
        TABLE.put( "j", new String[]{"じゃ","じ","じゅ","じぇ","じょ"});
        TABLE.put( "d", new String[]{"だ","ぢ","づ","で","ど"});
        TABLE.put( "b", new String[]{"ば","び","ぶ","べ","ぼ"});
        TABLE.put( "p", new String[]{"ぱ","ぴ","ぷ","ぺ","ぽ"});
        TABLE.put("gy", new String[]{"ぎゃ","ぎぃ","ぎゅ","ぎぇ","ぎょ"});
        TABLE.put("zy", new String[]{"じゃ","じぃ","じゅ","じぇ","じょ"});
        TABLE.put("jy", new String[]{"じゃ","じぃ","じゅ","じぇ","じょ"});
        TABLE.put("dy", new String[]{"ぢゃ","ぢぃ","ぢゅ","ぢぇ","ぢょ"});
        TABLE.put("by", new String[]{"びゃ","びぃ","びゅ","びぇ","びょ"});
        TABLE.put("py", new String[]{"ぴゃ","ぴぃ","ぴゅ","ぴぇ","ぴょ"});
        TABLE.put( "l", new String[]{"ぁ","ぃ","ぅ","ぇ","ぉ"});
        TABLE.put( "v", new String[]{"ヴぁ","ヴぃ","ヴ","ヴぇ","ヴぉ"});
        TABLE.put("sh", new String[]{"しゃ","し","しゅ","しぇ","しょ"});
        TABLE.put("sy", new String[]{"しゃ","し","しゅ","しぇ","しょ"});
        TABLE.put("ch", new String[]{"ちゃ","ち","ちゅ","ちぇ","ちょ"});
        TABLE.put("cy", new String[]{"ちゃ","ち","ちゅ","ちぇ","ちょ"});
        TABLE.put( "f", new String[]{"ふぁ","ふぃ","ふ","ふぇ","ふぉ"});
        TABLE.put( "q", new String[]{"くぁ","くぃ","く","くぇ","くぉ"});
        TABLE.put("ky", new String[]{"きゃ","きぃ","きゅ","きぇ","きょ"});
        TABLE.put("ty", new String[]{"ちゃ","ちぃ","ちゅ","ちぇ","ちょ"});
        TABLE.put("ny", new String[]{"にゃ","にぃ","にゅ","にぇ","にょ"});
        TABLE.put("hy", new String[]{"ひゃ","ひぃ","ひゅ","ひぇ","ひょ"});
        TABLE.put("my", new String[]{"みゃ","みぃ","みゅ","みぇ","みょ"});
        TABLE.put("ry", new String[]{"りゃ","りぃ","りゅ","りぇ","りょ"});
        TABLE.put("ly", new String[]{"ゃ","ぃ","ゅ","ぇ","ょ"});
        TABLE.put("lt", new String[]{"た","ち","っ","て","と"});
        TABLE.put("xy", new String[]{"ゃ","ぃ","ゅ","ぇ","ょ"});
        TABLE.put("xt", new String[]{"た","ち","っ","て","と"});
        TABLE.put( "x", new String[]{"ぁ","ぃ","ぅ","ぇ","ぉ"});
    };
    
    private static String getKanaFromTable(String s, int n) {

        if ( TABLE.containsKey(s) ) {
            return TABLE.get(s)[n];
        }
        return s + TABLE.get("")[n];
    }

    /**
     * ローマ字をかな文字へ変換する
     * @param org 変換元文字列
     * @return 変換後の文字列
     */
    protected static String conv(String org) {

        String last = "";
        StringBuilder line = new StringBuilder();

        for ( int i=0; i<org.length(); i++ ) {
            String tmp = org.substring(i,i+1);

            if ( tmp.equals("a") ) {
                line.append( getKanaFromTable(last, 0) );
                last = "";
            } else if ( tmp.equals("i") ) {
                line.append( getKanaFromTable(last, 1) );
                last = "";
            } else if ( tmp.equals("u") ) {
                line.append( getKanaFromTable(last, 2) );
                last = "";
            } else if ( tmp.equals("e") ) {
                line.append( getKanaFromTable(last, 3) );
                last = "";
            } else if ( tmp.equals("o") ) {
                line.append( getKanaFromTable(last, 4) );
                last = "";
            } else {
                if ( last.equals("n") && !(tmp.equals("y")) ) {
                    line.append("ん");
                    last = "";
                    if ( tmp.equals("n") ) {
                        continue;
                    }
                }
                if ( java.lang.Character.isLetter(tmp.charAt(0)) ) {
                    if ( last.equals(tmp) ) {
                        line.append("っ");
                        last = tmp;
                    } else {
                        last = last + tmp;
                    }
                } else {
                    line.append(last + tmp);
                    last = "";
                }
            }
        }
        line.append(last);

        return line.toString();
    }
    
    public static void main(String[] args) {
        
        String testee = "koreha tyanto henkan dekimasuka? doudesyouka?";
        System.out.println(conv(testee));
    }
    
}

実行結果
「これは ちゃんと へんかん できますか? どうでしょうか?」