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/*******************************************************************************
* Companion code for the book "Introduction to Software Design with Java"
* by Martin P. Robillard.
*
* Copyright (C) 2019 by Martin P. Robillard
*
* This code is licensed under a Creative Commons
* Attribution-NonCommercial-NoDerivatives 4.0 International License.
*
* See http://creativecommons.org/licenses/by-nc-nd/4.0/
*******************************************************************************/
package chapter7;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* Represents a deck of playing cards that can be inherited.
*/
public class Deck implements CardSource, Iterable<Card>
{
private CardStack aCards = new CardStack();
/**
* Creates a new deck of 52 cards, shuffled.
*/
public Deck()
{
shuffle();
}
/**
* Reinitializes the deck with all 52 cards, and shuffles them.
*/
public void shuffle()
{
List<Card> cards = new ArrayList<>();
for( Suit suit : Suit.values() )
{
for( Rank rank : Rank.values() )
{
cards.add( Card.get( rank, suit ));
}
}
Collections.shuffle(cards);
aCards = new CardStack(cards);
}
/**
* Draws a card from the deck: removes the card from the top
* of the deck and returns it.
* @return The card drawn.
* @pre !isEmpty()
*/
public Card draw()
{
assert !isEmpty();
return aCards.pop();
}
/**
* @return True if and only if there are no cards in the deck.
*/
public boolean isEmpty()
{
return aCards.isEmpty();
}
@Override
public Iterator<Card> iterator()
{
return aCards.iterator();
}
}