001    package listFW.visitor;
002    
003    import listFW.*;
004    
005    /**
006     * Sums a IList<Integer> using a reverse accumulation (natural recursion) algorithm. 
007     * @author Mathias Ricken - Copyright 2008 - All rights reserved.
008     */
009    public class SumIntList implements IListAlgo<Integer,Integer, Object> {
010        
011        public Integer emptyCase(IMTList<? extends Integer> host, Object ... inp) {
012            return 0;
013        }
014        public Integer nonEmptyCase(INEList<? extends Integer> host, Object ... inp) {
015            return host.getFirst() + host.getRest().execute(this);
016        }
017    }