Correct title case conversion in Java

TitleCase.java

import java.util.Map;
import java.util.HashMap;

public class TitleCase {
	private TitleCase() {}

	// Strictly speaking, this is 100% necessary for correct international behavior.
	// There is no way to do this that's built into Java.
	private static final Map<Integer, String> SPECIAL_MAP;
	
	static {
		SPECIAL_MAP = new HashMap<>();
		SPECIAL_MAP.put(  0xDF, "\u0053\u0073");           // ß -> Ss
		SPECIAL_MAP.put( 0x149, "\u02BC\u004E");           // ʼn -> ʼN
		SPECIAL_MAP.put( 0x1F0, "\u004A\u030C");           // ǰ -> J̌
		SPECIAL_MAP.put( 0x390, "\u0399\u0308\u0301");     // ΐ -> Ϊ́
		SPECIAL_MAP.put( 0x3B0, "\u03A5\u0308\u0301");     // ΰ -> Ϋ́
		SPECIAL_MAP.put( 0x587, "\u0535\u0582");           // և -> Եւ
		SPECIAL_MAP.put(0x1E96, "\u0048\u0331");           // ẖ -> H̱
		SPECIAL_MAP.put(0x1E97, "\u0054\u0308");           // ẗ -> T̈
		SPECIAL_MAP.put(0x1E98, "\u0057\u030A");           // ẘ -> W̊
		SPECIAL_MAP.put(0x1E99, "\u0059\u030A");           // ẙ -> Y̊
		SPECIAL_MAP.put(0x1E9A, "\u0041\u02BE");           // ẚ -> Aʾ
		SPECIAL_MAP.put(0x1F50, "\u03A5\u0313");           // ὐ -> Υ̓
		SPECIAL_MAP.put(0x1F52, "\u03A5\u0313\u0300");     // ὒ -> Υ̓̀
		SPECIAL_MAP.put(0x1F54, "\u03A5\u0313\u0301");     // ὔ -> Υ̓́
		SPECIAL_MAP.put(0x1F56, "\u03A5\u0313\u0342");     // ὖ -> Υ̓͂
		SPECIAL_MAP.put(0x1FB2, "\u1FBA\u0345");           // ᾲ -> Ὰͅ
		SPECIAL_MAP.put(0x1FB4, "\u0386\u0345");           // ᾴ -> Άͅ
		SPECIAL_MAP.put(0x1FB6, "\u0391\u0342");           // ᾶ -> Α͂
		SPECIAL_MAP.put(0x1FB7, "\u0391\u0342\u0345");     // ᾷ -> ᾼ͂
		SPECIAL_MAP.put(0x1FC2, "\u1FCA\u0345");           // ῂ -> Ὴͅ
		SPECIAL_MAP.put(0x1FC4, "\u0389\u0345");           // ῄ -> Ήͅ
		SPECIAL_MAP.put(0x1FC6, "\u0397\u0342");           // ῆ -> Η͂
		SPECIAL_MAP.put(0x1FC7, "\u0397\u0342\u0345");     // ῇ -> ῌ͂
		SPECIAL_MAP.put(0x1FD2, "\u0399\u0308\u0300");     // ῒ -> Ϊ̀
		SPECIAL_MAP.put(0x1FD3, "\u0399\u0308\u0301");     // ΐ -> Ϊ́
		SPECIAL_MAP.put(0x1FD6, "\u0399\u0342");           // ῖ -> Ι͂
		SPECIAL_MAP.put(0x1FD7, "\u0399\u0308\u0342");     // ῗ -> Ϊ͂
		SPECIAL_MAP.put(0x1FE2, "\u03A5\u0308\u0300");     // ῢ -> Ϋ̀
		SPECIAL_MAP.put(0x1FE3, "\u03A5\u0308\u0301");     // ΰ -> Ϋ́
		SPECIAL_MAP.put(0x1FE4, "\u03A1\u0313");           // ῤ -> Ρ̓
		SPECIAL_MAP.put(0x1FE6, "\u03A5\u0342");           // ῦ -> Υ͂
		SPECIAL_MAP.put(0x1FE7, "\u03A5\u0308\u0342");     // ῧ -> Ϋ͂
		SPECIAL_MAP.put(0x1FF2, "\u1FFA\u0345");           // ῲ -> Ὼͅ
		SPECIAL_MAP.put(0x1FF4, "\u038F\u0345");           // ῴ -> Ώͅ
		SPECIAL_MAP.put(0x1FF6, "\u03A9\u0342");           // ῶ -> Ω͂
		SPECIAL_MAP.put(0x1FF7, "\u03A9\u0342\u0345");     // ῷ -> ῼ͂
		SPECIAL_MAP.put(0xFB00, "\u0046\u0066");           // ff -> Ff
		SPECIAL_MAP.put(0xFB01, "\u0046\u0069");           // fi -> Fi
		SPECIAL_MAP.put(0xFB02, "\u0046\u006C");           // fl -> Fl
		SPECIAL_MAP.put(0xFB03, "\u0046\u0066\u0069");     // ffi -> Ffi
		SPECIAL_MAP.put(0xFB04, "\u0046\u0066\u006C");     // ffl -> Ffl
		SPECIAL_MAP.put(0xFB05, "\u0053\u0074");           // ſt -> St
		SPECIAL_MAP.put(0xFB06, "\u0053\u0074");           // st -> St
		SPECIAL_MAP.put(0xFB13, "\u0544\u0576");           // ﬓ -> Մն
		SPECIAL_MAP.put(0xFB14, "\u0544\u0565");           // ﬔ -> Մե
		SPECIAL_MAP.put(0xFB15, "\u0544\u056B");           // ﬕ -> Մի
		SPECIAL_MAP.put(0xFB16, "\u054E\u0576");           // ﬖ -> Վն
		SPECIAL_MAP.put(0xFB17, "\u0544\u056D");           // ﬗ -> Մխ
	}
	
	public static String convertCodePoint(int codepoint) {
		if (SPECIAL_MAP.containsKey(codepoint)) {
			return SPECIAL_MAP.get(codepoint);
		} else {
			return Character.toString(Character.toTitleCase(codepoint));
		}
	}

	public static String convertString(String input) {
    		int first = Character.codePointAt(input, 0);

    		return new StringBuilder()
    			.append(convertCodePoint(first))
    			.append(input, Character.offsetByCodePoints(input, 0, 1), input.length())
    			.toString();
	}
}