1 | package bargainingchips.utilityfunctions;
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2 |
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3 | import bargainingchips.Bundle;
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4 | import bargainingchips.BundleBuilder;
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5 | import bargainingchips.Chip;
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6 | import bargainingchips.WishList;
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7 | import bargainingchips.WishListBuilder;
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8 |
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9 | /**
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10 | * Utility function for testing that acts on queantity alone.
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11 | * Returns 1 when the wish list is exactly satisfied. Becomes lower with higher quantity deviations.
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12 | */
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13 | public class UF_CloseToQuantity implements UtilityFunction
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14 | {
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15 | private WishList wishlist;
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16 |
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17 | public UF_CloseToQuantity(WishList w)
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18 | {
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19 | this.wishlist = w;
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20 | }
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21 |
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22 |
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23 | @Override
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24 | public Double getUtility(Bundle b)
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25 | {
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26 | int totalDeviation = 0;
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27 | for (Chip c : wishlist)
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28 | {
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29 | int desired = wishlist.getQuantity(c);
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30 | Integer offered = b.getQuantity(c);
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31 | if (offered == null)
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32 | offered = 0;
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33 |
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34 | int deviationOffered = Math.abs(desired - offered);
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35 | totalDeviation += deviationOffered;
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36 | }
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37 |
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38 | return 1.0 / (1 + totalDeviation);
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39 | }
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40 |
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41 | @Override
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42 | public String toString()
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43 | {
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44 | return this.getClass().getSimpleName() + ": " + wishlist.toString();
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45 | }
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46 |
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47 | public static void main(String[] args)
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48 | {
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49 | WishList wishlist = new WishListBuilder().addWish("Red", 7).addWish("Green", 5).build();
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50 | UF_CloseToQuantity u = new UF_CloseToQuantity(wishlist);
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51 | System.out.println(u);
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52 |
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53 | Bundle offer = new BundleBuilder()
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54 | .addStack("Red", 1.0, 6)
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55 | .addStack("Green", 3.0, 15)
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56 | .addStack("Purple", 0.10, 10)
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57 | .build();
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58 | System.out.println(u.getUtility(offer));
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59 | }
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60 |
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61 | }
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62 |
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