StringUtils.java

package net.mms_projects.utils;

/**
 * @see <a href="http://stackoverflow.com/a/3657496">http://stackoverflow.com/a/3657496</a>
 */
public class StringUtils {

    private final static String NON_THIN = "[^iIl1\\.,']";

    private static int textWidth(String str) {
        return (int) (str.length() - str.replaceAll(NON_THIN, "").length() / 2);
    }

    public static String ellipsize(String text, int max) {

        if (textWidth(text) <= max)
            return text;

        // Start by chopping off at the word before max
        // This is an over-approximation due to thin-characters...
        int end = text.lastIndexOf(' ', max - 3);

        // Just one long word. Chop it off.
        if (end == -1)
            return text.substring(0, max - 3) + "...";

        // Step forward as long as textWidth allows.
        int newEnd = end;
        do {
            end = newEnd;
            newEnd = text.indexOf(' ', end + 1);

            // No more spaces.
            if (newEnd == -1)
                newEnd = text.length();

        } while (textWidth(text.substring(0, newEnd) + "...") < max);

        return text.substring(0, end) + "...";
    }

}