[316] | 1 | package bargainingchips;
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[315] | 2 |
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| 3 | import java.util.List;
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| 4 |
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| 5 | import java.util.ArrayList;
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| 6 | import java.util.Collections;
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| 7 | import java.util.Iterator;
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| 8 |
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| 9 | /**
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| 10 | * Offers are exchanged in Bundle formats.
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| 11 | * A Bundle is a set of several stacks, {s_1, ..., s_n}, where no two stacks are of the same color.
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| 12 | * A stack can be aggregated into a bundle, if at the same color of one of the Bundle's stacks.
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| 13 | * Two bundles can also be aggregated into a new bundle, where every two stacks of the same colors from both bundles are aggregated into one stack in the new bundle.
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| 14 | * Aggregation of a bundle with the empty stack or empty bundle is itself.
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| 15 | *
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| 16 | * Immutable.
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| 17 | */
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| 18 | public class Bundle implements Iterable<Stack>
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| 19 | {
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| 20 | private final List<Stack> bundle;
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| 21 |
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| 22 | /**
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| 23 | * Makes sure bundle remains unmodifiable.
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| 24 | */
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| 25 | public Bundle(List<Stack> list)
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| 26 | {
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| 27 | List<Stack> tmpListOfHolding = new ArrayList<Stack>();
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| 28 | tmpListOfHolding.addAll(list);
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| 29 | this.bundle = Collections.unmodifiableList(tmpListOfHolding);
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| 30 | }
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| 31 |
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| 32 | /**
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| 33 | * @return the bundle
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| 34 | */
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| 35 | public List<Stack> getBundle()
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| 36 | {
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| 37 | return bundle;
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| 38 | }
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| 39 |
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| 40 | @Override
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| 41 | public String toString()
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| 42 | {
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| 43 | return bundle.toString();
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| 44 | }
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| 45 |
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| 46 | public int size()
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| 47 | {
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| 48 | return getBundle().size();
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| 49 | }
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| 50 |
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| 51 | public Iterator<Stack> iterator()
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| 52 | {
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| 53 | return bundle.iterator();
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| 54 | }
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| 55 |
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| 56 |
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| 57 | public Double getTotalPrice()
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| 58 | {
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| 59 | double sum=0.0;
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| 60 | for (Stack t: bundle)
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| 61 | sum += t.getTotalPrice();
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| 62 | return sum;
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| 63 | }
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| 64 |
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| 65 | /**
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| 66 | * Gets the quantity of the right stack in this bundle
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| 67 | */
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| 68 | public Integer getQuantity(Chip c)
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| 69 | {
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| 70 | for (Stack s : this)
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| 71 | if (s.getChip().equals(c))
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| 72 | return s.getQuantity();
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| 73 | return null;
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| 74 | }
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| 75 |
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| 76 | /**
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| 77 | * Gets the unit price of the chip in the right stack in this bundle
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| 78 | */
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| 79 | public double getUnitPrice(Chip c)
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| 80 | {
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| 81 | for (Stack s : this)
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| 82 | if (s.getChip().equals(c))
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| 83 | return s.getUnitPrice();
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| 84 | return 0.0;
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| 85 | }
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| 86 |
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| 87 | /**
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| 88 | *
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| 89 | * bundle "+" bundle
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| 90 | *
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| 91 | * @param b, this method adds bundle b to `this' bundle
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| 92 | * @return the aggregated bundle
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| 93 | * where, any two stacks of the same colors are aggregated as a new stack into the new bundle, otherwise, they are just added into the new bundle.
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| 94 | *
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| 95 | * This method just calls stack '+' stack aggregation operation (has no need to bundle "+" stack aggregation operation.
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| 96 | */
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| 97 | public Bundle aggregateWith(Bundle b)
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| 98 | {
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| 99 | // Start with this bundle
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| 100 | Bundle agg = new Bundle(this.getBundle());
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| 101 | // And add all stacks from b
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| 102 | for (Stack t : b)
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| 103 | agg = agg.aggregateWith(t);
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| 104 |
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| 105 | return agg;
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| 106 | }
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| 107 |
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| 108 |
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| 109 |
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| 110 |
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| 111 | /**
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| 112 | * bundle '+' stack
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| 113 | *
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| 114 | * @param s, this method adds stack s to `this' bundle
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| 115 | * @return the aggregated bundle
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| 116 | * where, stack s is aggregated with a stack of the same color in `this' bundle and the new stack is added into the new bundle;
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| 117 | * otherwise, stack s is just added into the new bundle.
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| 118 | */
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| 119 | public Bundle aggregateWith(Stack s)
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| 120 | {
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| 121 | ArrayList<Stack> agg = new ArrayList<Stack>();
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| 122 | boolean sameColorFound = false;
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| 123 | for (Stack t : bundle)
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| 124 | if (!t.hasSameColorAs(s))
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| 125 | agg.add(t);
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| 126 | else
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| 127 | {
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| 128 | agg.add(s.aggregateWith(t));
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| 129 | sameColorFound = true;
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| 130 | }
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| 131 | if (!sameColorFound)
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| 132 | agg.add(s);
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| 133 | return new Bundle(agg);
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| 134 | }
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| 135 |
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| 136 | public static void main(String[] args)
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| 137 | {
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| 138 | Bundle b = new BundleBuilder()
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| 139 | .addStack("Red", 7.0, 3)
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| 140 | .addStack("Green", 3.0, 5)
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| 141 | .addStack("Purple", 2.0, 7)
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| 142 | .build();
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| 143 |
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| 144 | Bundle c = new BundleBuilder()
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| 145 | .addStack("Red", 5.0, 3)
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| 146 | .addStack("Yellow", 9.0, 1)
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| 147 | .addStack("Green", 9.0, 1)
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| 148 | .build();
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| 149 |
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| 150 | System.out.println(b);
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| 151 | System.out.println(b.aggregateWith(new Stack("Green", 3.0, 2)));
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| 152 | System.out.println(b.aggregateWith(c));
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| 153 | }
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| 154 |
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| 155 |
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| 156 |
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| 157 | }
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