Negative font utility

gistfile1.txt

public class FontUtils {
    /**
     * This map is used to efficiently generate unicode symbols
     */
    private static final TreeMap<Integer, String> WHITE_SPACE_MAP = new TreeMap<>() {{
        put(-1, "\uF801");
        put(-2, "\uF802");
        put(-3, "\uF803");
        put(-4, "\uF804");
        put(-5, "\uF805");
        put(-6, "\uF806");
        put(-7, "\uF807");
        put(-8, "\uF808");
        put(-9, "\uF808\uF801");
        put(-10, "\uF808\uF802");
        put(-11, "\uF808\uF803");
        put(-12, "\uF808\uF804");
        put(-13, "\uF808\uF805");
        put(-14, "\uF808\uF806");
        put(-15, "\uF808\uF807");
        put(0, "");
        put(1, "\uF821");
        put(2, "\uF822");
        put(3, "\uF823");
        put(4, "\uF824");
        put(5, "\uF825");
        put(6, "\uF826");
        put(7, "\uF827");
        put(8, "\uF828");
        put(9, "\uF828\uF821");
        put(10, "\uF828\uF822");
        put(11, "\uF828\uF823");
        put(12, "\uF828\uF824");
        put(13, "\uF828\uF825");
        put(14, "\uF828\uF826");
        put(15, "\uF828\uF827");
    }};

    /**
     * Gets the unicodes to create an offset of the specified pixel width.
     * <br><br>
     * negative integers are accepted
     * @param offset the offset to generate space for
     * @return blankSpace
     */
    public static String getBlankSpace(final int offset) {
        if (Math.abs(offset) <= 15) {
            return WHITE_SPACE_MAP.get(offset);
        }
        final StringBuilder output = new StringBuilder();
        int currentNumber = Math.abs(offset);

        while (currentNumber > 0) {
            final int closestKey = WHITE_SPACE_MAP.floorKey(currentNumber);
            output.append(WHITE_SPACE_MAP.get(offset < 0 ? -closestKey : closestKey));

            currentNumber -= closestKey;
        }
        return output.toString();
    }
}