Question about Group.getHeads()

[Mats Sigge]

Hi! I just started looking at LambdaJ and I'm playing with group(). And either I don't understand the getHeads() method, or there is a bug in it. If I run the test below, I get the output [], [bar] (on two lines), but I would have expected [foo], [foo, bar] (or [bar, foo] since it's a set). Is this the way it's intended to work? If so, could someone explain why? Or is it just a bug?

Other than that, kudo for a great library.

Regards,

Mats Sigge

My code:

import java.util.Arrays;

import java.util.List;

import ch.lambdaj.group.Group;

import static ch.lambdaj.Lambda.*;

public class LambdaJGroupTest {

    public static class Data {

        String foo;

        String bar;

        Data(String foo, String bar) {

            this.foo = foo;

            this.bar = bar;

        }

        public String getFoo() {

            return foo;

        }

        public String getBar() {

            return bar;

        }

    }

    public static void main(String[] args) {

        List<Data> list = Arrays.asList(

                new Data("foo1", "bar1"),

                new Data("foo1", "bar2"),

                new Data("foo2", "bar1"),

                new Data("foo2", "bar2")

        );

        Group<Data> group = group(list, by(on(Data.class).getFoo()), by(on(Data.class).getBar()));

        System.out.println(group.findGroup("foo1").getHeads());

        System.out.println(group.findGroup("foo1").findGroup("bar1").getHeads());

    }

}