Method: static {...}

1: package de.schereSteinPapier.strategy;
2:
3: import java.util.Optional;
4: import java.util.Random;
5:
6: import de.schereSteinPapier.domain.SSPPlayer;
7: import de.schereSteinPapier.domain.SSPState;
8: import de.schereSteinPapier.domain.SSPStrategy;
9: import de.schereSteinPapier.moves.SSPMove;
10: import de.schereSteinPapier.moves.factory.SSPMoveFactory;
11:
12: /**
13: * Implements {@link SSPStrategy} by saying "Papier, Stein, Schere" with a 1/3 chance per entry.
14: */
15: public class SSPSayEquilibriumStrategy implements SSPStrategy {
16:
17: /**
18: * The random number generator.
19: */
20: private static final Random RANDOM = new Random();
21:
22: /**
23: * The factory for creating SSP moves.
24: */
25: private final SSPMoveFactory moveFactory;
26:
27: /**
28: * Creates an {@link SSPSayEquilibriumStrategy}.
29: *
30: * @param moveFactory The factory for creating SSP moves.
31: */
32: SSPSayEquilibriumStrategy(final SSPMoveFactory moveFactory) {
33: this.moveFactory = moveFactory;
34: }
35:
36: /**
37: * returns "SCHERE", "STEIN", "PAPIER" with a chance of 1/3 each.
38: */
39: public Optional<SSPMove> weightedRandomAnswer() {
40: // generates a random number between 0 and 2 inclusively
41: final int weight = RANDOM.nextInt(3);
42: if (weight < 1) {
43: return Optional.of(this.moveFactory.createSchereMove());
44: }
45: if (weight < 2) {
46: return Optional.of(this.moveFactory.createSteinMove());
47: }
48: return Optional.of(this.moveFactory.createPapierMove());
49: }
50:
51: @Override
52: public Optional<SSPMove> computeNextMove(final int gameId, final SSPPlayer player, final SSPState state) {
53: return this.weightedRandomAnswer();
54: }
55:
56: @Override
57: public String toString() {
58: return SSPSayEquilibriumStrategy.class.getSimpleName();
59: }
60: }