Translit.java

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package com.adobe.dp.epub.util;

import java.util.Hashtable;

public class Translit {

	final static int NEUTRAL = 0;

	final static int UPPER = 1;

	final static int LOWER = 2;

	final static Hashtable map = makeTranslitMap();

	private static Hashtable makeTranslitMap() {
		Hashtable map = new Hashtable();
		map.put(new Character('а'), "a");
		map.put(new Character('б'), "b");
		map.put(new Character('в'), "v");
		map.put(new Character('г'), "g");
		map.put(new Character('д'), "d");
		map.put(new Character('е'), "e");
		map.put(new Character('ё'), "yo");
		map.put(new Character('ж'), "zh");
		map.put(new Character('з'), "z");
		map.put(new Character('и'), "i");
		map.put(new Character('й'), "j");
		map.put(new Character('к'), "k");
		map.put(new Character('л'), "l");
		map.put(new Character('м'), "m");
		map.put(new Character('н'), "n");
		map.put(new Character('о'), "o");
		map.put(new Character('п'), "p");
		map.put(new Character('р'), "r");
		map.put(new Character('с'), "s");
		map.put(new Character('т'), "t");
		map.put(new Character('у'), "u");
		map.put(new Character('ф'), "f");
		map.put(new Character('х'), "h");
		map.put(new Character('ц'), "ts");
		map.put(new Character('ч'), "ch");
		map.put(new Character('ш'), "sh");
		map.put(new Character('щ'), "sh'");
		map.put(new Character('ъ'), "`");
		map.put(new Character('ы'), "y");
		map.put(new Character('ь'), "'");
		map.put(new Character('э'), "e");
		map.put(new Character('ю'), "yu");
		map.put(new Character('я'), "ya");
		map.put(new Character('«'), "\"");
		map.put(new Character('»'), "\"");
		map.put(new Character('№'), "No");
		return map;
	}

	private static int charClass(char c) {
		if (Character.isLowerCase(c))
			return LOWER;
		if (Character.isUpperCase(c))
			return UPPER;
		return NEUTRAL;
	}

	public static String translit(String text) {
		int len = text.length();
		if (len == 0)
			return text;
		StringBuffer sb = new StringBuffer();
		int pc = NEUTRAL;
		char c = text.charAt(0);
		int cc = charClass(c);
		for (int i = 1; i <= len; i++) {
			char nextChar = (i < len ? text.charAt(i) : ' ');
			int nc = charClass(nextChar);
			Character co = new Character(Character.toLowerCase(c));
			String tr = (String) map.get(co);
			if (tr == null) {
				sb.append(c);
			} else {
				switch (cc) {
				case LOWER:
				case NEUTRAL:
					sb.append(tr);
					break;
				case UPPER:
					if (nc == LOWER || (nc == NEUTRAL && pc != UPPER)) {
						sb.append(Character.toUpperCase(tr.charAt(0)));
						if (tr.length() > 0) {
							sb.append(tr.substring(1));
						}
					} else {
						sb.append(tr.toUpperCase());
					}
				}
			}
			c = nextChar;
			pc = cc;
			cc = nc;
		}
		return sb.toString();
	}

	public static String makeFileName(String text) {
		int len = text.length();
		if (len == 0)
			return text;
		StringBuffer sb = new StringBuffer();
		char lastAppended = 0;
		int count = 0;
		for (int i = 0; i < len; i++) {
			char c = text.charAt(i);
			if ((c & 0xFFFF) > 0x7F) {
				// keep non-ASCII as is
			} else if (c <= ' ' || c == '/' || c == '\\' || c == ':' || c == '~' || c == '"' || c == '.') {
				c = '_';
			}
			if (c == '_' && lastAppended == '_')
				continue;
			sb.append(c);
			if (++count > 50)
				break;
			lastAppended = c;
		}
		return sb.toString();
	}
}