String Formatter in GWT

Question

How do I format my string in GWT?

I made a method

  Formatter format = new Formatter();
    int matches = 0;
    Formatter formattedString = format.forma         


        

Answer 1

Another suggestion which makes use of JSNI and a nice JavaScript format function from another post:

import com.google.gwt.core.client.JsArrayString;

public abstract class StringFormatter {
    public static String format(final String format, final Object... args) {
        if (null == args || 0 == args.length)
            return format;
        JsArrayString array = newArray();
        for (Object arg : args) {
            array.push(String.valueOf(arg)); // TODO: smarter conversion?
        }
        return nativeFormat(format, array);
    }

    private static native JsArrayString newArray()/*-{
        return [];
    }-*/;

    private static native String nativeFormat(final String format, final JsArrayString args)/*-{
        return format.replace(/{(\d+)}/g, function(match, number) {
            return typeof args[number] != 'undefined' ? args[number] : match;
        });
    }-*/;
}

One can then make a call like this:

StringFormatter.format("Greetings {0}, it's {1} o'clock, which is a {2} statement", "Master", 8, false);

...with the result being

Greetings Master, it's 8 o'clock, which is a false statement

There is a potential to improve further at the TODO comment, e.g. utilise NumberFormat. Suggestions are welcome.