private ArrayList<Card> pickNRandomDifferentCards(int nCards) {
if (nCards > 5) {
throw new IllegalArgumentException("Don't yet know how to generate more than 5 random cards");
}
TreeSet<Rank> ranks = new TreeSet<Rank>();
ArrayList<Card> cards = new ArrayList<Card>();
while (ranks.size() != nCards) {
Rank randomRank = Rank.getRandomRank();
if (ranks.contains(randomRank)) {
continue;
}
ranks.add(randomRank);
if (ranks.size() == 5) {
Iterator<Rank> iRank = ranks.iterator();
boolean straight = true;
Rank previousRank = iRank.next();
while (iRank.hasNext()) {
Rank nextRank = iRank.next();
// annoying edge case of 2-3-4-5-A
if (previousRank.addToRank(1) != nextRank) {
if (!(previousRank == Rank.FIVE && nextRank == Rank.ACE)) {
straight = false;
break;
}
}
previousRank = nextRank;
}
// make sure we don't accidentally crate a straight
if (straight) {
ranks.remove(randomRank);
continue;
}
}
}
TreeSet<Suit> suits = new TreeSet<Suit>();
for (Rank randomRank : ranks) {
Suit randomSuit = Suit.getRandomSuit();
// make sure that there are more than one suit
while (suits.size() == 1 && suits.contains(randomSuit)) {
randomSuit = Suit.getRandomSuit();
}
suits.add(randomSuit);
Card card = Card.from(randomRank, randomSuit);
cards.add(card);
}
return cards;
}
private IHand generateRandomStraight() {
Rank randomRank = Rank.getRandomRank(Rank.TEN);
ImmutableSortedSet.Builder<Card> builder =
ImmutableSortedSet.orderedBy(new Card.RankThenSuitComparer());
builder.add(Card.from(randomRank, Suit.getRandomSuit()));
builder.add(Card.from(randomRank.addToRank(1), Suit.getRandomSuit()));
builder.add(Card.from(randomRank.addToRank(2), Suit.getRandomSuit()));
builder.add(Card.from(randomRank.addToRank(3), Suit.SPADES));
builder.add(Card.from(randomRank.addToRank(4), Suit.HEARTS));
return new SortedHand(builder.build());
}
private IHand generateRandomFlush(StandardDeckFactory deckFactory) {
ArrayList<Card> cards = pickNRandomDifferentCards(5);
Suit randomSuit = Suit.getRandomSuit();
IDeck deck = deckFactory.build();
ImmutableSortedSet.Builder<Card> builder =
ImmutableSortedSet.orderedBy(new Card.RankThenSuitComparer());
builder.add(Card.from(cards.get(0).rank(), randomSuit));
builder.add(Card.from(cards.get(1).rank(), randomSuit));
builder.add(Card.from(cards.get(2).rank(), randomSuit));
builder.add(Card.from(cards.get(3).rank(), randomSuit));
builder.add(Card.from(cards.get(4).rank(), randomSuit));
return new SortedHand(builder.build());
}