import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

import perlforjava.control.Looper;
import perlforjava.functions.Arrays;
import perlforjava.functions.Mapper;
import perlforjava.lang.Block;

public class TheSchwartz {

    public static void main(String[] args) {

        // Create a new List of values to sort
        ArrayList in = new ArrayList();
        in.add("foobarbazquux");
        in.add("foo");
        in.add("foobarbaz");
        in.add("foobar");

        /* Sort based upon length of string by mapping each string to
           a List where the first element is the string and the second is
           its length. Sort on the latter and return a new List of strings. */

        List out = Mapper.map(
            new Block() {    
                // pull the first element from each List and return it
                protected Object process(Object elem) {
                    return ((List)elem).get(0);
                } 
            }, Arrays.sort(
                // run the comparison of Integer values to determine order
                new Comparator() {
                    public int compare(Object a, Object b) {
                        return ((Integer)((List)a).get(1)).
                        compareTo(((Integer)((List)b).get(1)));
                    } 
                },
                // map each string into an ArrayList of string => length
                Mapper.map(
                    new Block() {
                        protected Object process(Object elem) {
                            ArrayList temp = new ArrayList();
                            temp.add(elem);
                            temp.add(new Integer(((String)elem).length()));
                            return temp;
                        } 
                    },
                    in
                ) 
            )        
        );

        // Loop over the results to view them
        Looper.foreach(
            out,
            new Block() {
                protected Object process(Object elem) {
                    System.out.println("ELEM " + elem.toString());
                    return null;
                }
            }
        ); 
    }
}