Arabic Unicode

/**
 * 
 * @author MErsan
 */
public class ArabicUnicode {

    private final static char[] digits = {
        '0', '1', '2', '3', '4', '5',
        '6', '7', '8', '9', 'a', 'b',
        'c', 'd', 'e', 'f'
    };

    public static String decode(String s) {
        if (s == null || s.length() <= 0) {
            return null;
        }
        String[] strings = s.split("\\\\");
        StringBuilder result = new StringBuilder(strings.length);
        for (String h : strings) {
            if (h != null && h.length() >= 5 && h.startsWith("u")) {
                result.append((char) Integer.parseInt(h.substring(1, 5), 16));
                if (h.length() > 5) {
                    result.append(h.substring(5, h.length()));
                }
            } else {
                result.append(h);
            }
        }
        return result.toString();
    }

    public static String encode(String text) {
        if (text == null || text.length() <= 0) {
            return null;
        }
        int textLen = text.length();
        StringBuilder buffer = new StringBuilder(textLen * 4);
        for (int i = 0; i < textLen; i++) {
            char c = text.charAt(i);
            if (c < 32 || c > 126) {
                buffer.append(toUnsignedString(text.charAt(i)));
            } else {
                buffer.append(c);
            }
        }
        return buffer.toString();
    }
    final static int shift = 4;
    final static int mask = 15;

    public static String toUnsignedString(int i) {
        char[] buf = {'\\', 'u', '0', '0', '0', '0'};
        int charPos = 6;


        do {
            buf[--charPos] = digits[i & mask];
            i >>>= shift;
        } while (i != 0);
        return new String(buf);
    }
}