src/solitaire/Foundation.java

   1 package solitaire;
   2
   3 import java.util.LinkedList;
   4 import java.util.List;
   5
   6 final class Foundation {
   7     private final List<Card> cards;
   8     private final Suit suit;
   9
  10     Foundation(Suit suit) {
  11         this.cards = new LinkedList<>();
  12         this.suit = suit;
  13     }
  14
  15     Suit getSuit() {
  16         return suit;
  17     }
  18
  19     boolean isFull() {
  20         return cards.size() == Rank.RANKS.size();
  21     }
  22
  23     private boolean isValidNextCard(Card card) {
  24         Rank cardRank, lastRank;
  25
  26         if (card.getSuit() != this.suit)
  27             return false;
  28
  29         cardRank = card.getRank();
  30
  31         if (cards.isEmpty())
  32             return cardRank == Rank.ACE;
  33
  34         lastRank = cards.getLast().getRank();
  35
  36         return cardRank.isSuccessorOf(lastRank);
  37     }
  38
  39     boolean add(Card card) {
  40         if (!isValidNextCard(card))
  41             return false;
  42
  43         cards.add(card);
  44         return true;
  45     }
  46
  47     @Override
  48     public String toString() {
  49         if (cards.isEmpty())
  50             return String.format("( %s )", suit);
  51
  52         return String.format("(%s)", cards.getLast());
  53     }
  54 }