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Dotify Library

There is a newer version: 1.0.7

package org.daisy.dotify.api.formatter;

class AlphaNumeral {
    private static final int size = 26;

    public static String int2alpha(int n) {
        if (n < 1) {
            throw new NumberFormatException("Value must be bigger than zero.");
        }
        n = n - 1;
        int pos = n % size;
        if (n >= size) {
            return int2alpha((n - pos) / size) + (char) (pos + 65);
        } else {
            return "" + (char) (pos + 65);
        }
    }

}