package listFW.visitor;

import listFW.*;

/**
 * Sums a list of Numbers, including lists of any sub-types.
 * @author Mathias Ricken - Copyright 2008 - All rights reserved.
 */
public class SumNumList implements IListAlgo<Number,Number,Object> {
    
    public Number emptyCase(IMTList<? extends Number> host, Object ... inp) {
        return 0;
    }
    public Number nonEmptyCase(INEList<? extends Number> host, Object ... inp) {
        return host.getFirst().doubleValue() + host.getRest().execute(this).doubleValue();
    }
}