Method: DilemmaTitForTatStrategy(IDilemmaMoveFactory)

1: package de.fhdw.gaming.ipspiel23.dilemma.strategy.internals.tit_for_tat;
2:
3: import java.util.Optional;
4:
5: import de.fhdw.gaming.core.domain.GameException;
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.moves.IDilemmaMove;
9: import de.fhdw.gaming.ipspiel23.dilemma.moves.IDilemmaMoveFactory;
10: import de.fhdw.gaming.ipspiel23.dilemma.strategy.internals.DilemmaMemoryStrategy;
11: import de.fhdw.gaming.ipspiel23.dilemma.strategy.internals.DilemmaRoundData;
12: import de.fhdw.gaming.ipspiel23.dilemma.strategy.internals.DilemmaRoundPlayerData;
13: import de.fhdw.gaming.ipspiel23.memory.GameMemoryCapacity;
14: import de.fhdw.gaming.ipspiel23.memory.IGameMemory;
15: import de.fhdw.gaming.ipspiel23.memory.IGameMemoryCapacity;
16:
17: /**
18: * Cooperates on the first round and imitates its opponent's previous move thereafter.
19: */
20: public class DilemmaTitForTatStrategy extends DilemmaMemoryStrategy {
21:
22: /**
23: * Creates a new instance of the {@link DilemmaTitForTatStrategy} class.
24: * @param moveFactory the move factory to use.
25: */
26: protected DilemmaTitForTatStrategy(final IDilemmaMoveFactory moveFactory) {
27: super(moveFactory);
28: }
29:
30: @Override
31: public Optional<IDilemmaMove> computeNextMove(final int gameId, final IDilemmaPlayer player,
32: final IDilemmaState state)
33: throws GameException, InterruptedException {
34: final IGameMemory<DilemmaRoundData> memory = getMemoryForPlayer(player, state);
35: final IDilemmaMoveFactory moveFactory = getMoveFactory();
36: // cooperate on the first round ...
37: if (memory.size() == 0) {
38: return Optional.of(moveFactory.createCooperateMove());
39: }
40: // ...and imitate the opponent's previous move thereafter.
41: final DilemmaRoundData previousRound = memory.getLatestRound();
42: final DilemmaRoundPlayerData otherPlayersAction = previousRound.forOpponentOf(player);
43: final IDilemmaMove myMove = moveFactory.sameAs(otherPlayersAction.move());
44: return Optional.of(myMove);
45: }
46:
47: @Override
48: protected IGameMemoryCapacity requestedMemoryCapacity() {
49: return GameMemoryCapacity.of(1);
50: }
51: }