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 nextCard) {
  24         if (nextCard.getSuit() != this.suit)
  25             return false;
  26
  27         if (cards.isEmpty())
  28             return nextCard.getRank() == Rank.ACE;
  29
  30         Card lastCard = cards.getLast();
  31
  32         return nextCard.getRank().isSuccessorOf(lastCard.getRank());
  33     }
  34
  35     boolean add(Card card) {
  36         if (!isValidNextCard(card))
  37             return false;
  38
  39         cards.add(card);
  40         return true;
  41     }
  42
  43     @Override
  44     public String toString() {
  45         if (cards.isEmpty())
  46             return String.format("( %s )", suit);
  47
  48         return String.format("(%s)", cards.getLast());
  49     }
  50 }