Method: static {...}

1: package de.fhdw.gaming.ipspiel23.dilemma.strategy.internals.probability;
2:
3: import java.util.Optional;
4: import java.util.Random;
5:
6: import de.fhdw.gaming.ipspiel23.dilemma.domain.IDilemmaPlayer;
7: import de.fhdw.gaming.ipspiel23.dilemma.domain.IDilemmaState;
8: import de.fhdw.gaming.ipspiel23.dilemma.domain.IDilemmaStrategy;
9: import de.fhdw.gaming.ipspiel23.dilemma.moves.IDilemmaMove;
10: import de.fhdw.gaming.ipspiel23.dilemma.moves.IDilemmaMoveFactory;
11: import de.fhdw.gaming.ipspiel23.dilemma.strategy.internals.DilemmaStrategy;
12:
13: /**
14: * Implements {@link IDilemmaStrategy} by cooperating with a fixed probability.
15: */
16: public class DilemmaProbabilityStrategy extends DilemmaStrategy {
17:
18: /**
19: * Fixed probability with which this strategy cooperates.
20: */
21: static final double PROBABILITY_FOR_COOPERATION = 0.75d;
22:
23: /**
24: * A portal to the realm of entropy and unexpectedness.
25: */
26: private static final Random RANDOM = new Random();
27:
28: /**
29: * Creates an {@link DilemmaCooperateStrategy}.
30: *
31: * @param moveFactory The factory for creating Dilemma moves.
32: */
33: DilemmaProbabilityStrategy(final IDilemmaMoveFactory moveFactory) {
34: super(moveFactory);
35: }
36:
37: @Override
38: public Optional<IDilemmaMove> computeNextMove(final int gameId,
39: final IDilemmaPlayer player,
40: final IDilemmaState state) {
41: return Optional.of(RANDOM.nextDouble() <= PROBABILITY_FOR_COOPERATION
42: ? getMoveFactory().createCooperateMove()
43: : getMoveFactory().createDefectMove());
44: }
45:
46: @Override
47: public String toString() {
48: return DilemmaProbabilityStrategy.class.getSimpleName();
49: }
50:
51: @Override
52: public boolean equals(final Object object) {
53: if (object instanceof DilemmaProbabilityStrategy) {
54: final DilemmaProbabilityStrategy probabilityStrategy = (DilemmaProbabilityStrategy) object;
55: return this.toString().equals(probabilityStrategy.toString());
56: } else {
57: return false;
58: }
59: }
60:
61: @Override
62: public int hashCode() {
63: return super.hashCode() * this.toString().hashCode();
64: }
65: }