source: src/main/java/onetomany/bargainingchipsgame/players/utilityfunction/UF_CloseToQuantityMaxPrice.java@ 301

/**
 * UtilityFunctionAllOrNothing class
 */
package onetomany.bargainingchipsgame.players.utilityfunction;

import onetomany.bargainingchipsgame.Bundle;
import onetomany.bargainingchipsgame.BundleBuilder;
import onetomany.bargainingchipsgame.Chip;
import onetomany.bargainingchipsgame.WishList;
import onetomany.bargainingchipsgame.WishListBuilder;

/**
 * Returns 1 when the wish list is exactly satisfied and price <= max. 
 * Becomes lower with higher quantity deviations.
 */
public class UF_CloseToQuantityMaxPrice implements UtilityFunction 
{
        private WishList wishlist;
        private double maxprice;


        public UF_CloseToQuantityMaxPrice(WishList w, double max)
        {
                this.wishlist = w;
                this.maxprice = max;
        }


        @Override
        public Double getUtility(Bundle b) 
        {
                if (b.getTotalPrice() > maxprice)
                        return 0.0;

                int totalDeviation = 0;
                for (Chip c : wishlist)
                {
                        int desired = wishlist.getQuantity(c);
                        Integer offered = b.getQuantity(c);
                        if (offered == null)
                                offered = 0;

                        int deviationOffered = Math.abs(desired - offered);
                        totalDeviation+=deviationOffered;
                }

                return 1.0 / (1 + totalDeviation);
        }

        @Override
        public String toString()
        {
                return this.getClass().getSimpleName() + ": " + wishlist.toString() + " for <= $" + maxprice;
        }
        
        public static void main(String[] args) 
        {
                WishList wishlist = new WishListBuilder().addWish("Red", 7).addWish("Green", 5).build();
                UF_CloseToQuantityMaxPrice u = new UF_CloseToQuantityMaxPrice(wishlist, 100.0);
                System.out.println(u);
                
                Bundle offer = new BundleBuilder()
                                .addStack("Red", 1.0, 6)
                                .addStack("Green", 3.0, 5)
                                .addStack("Purple", 0.10, 10)
                                .build();
                System.out.println(u.getUtility(offer));
        }

}