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/*******************************************************************************

* Companion code for the book "Introduction to Software Design with Java",

* 2nd edition by Martin P. Robillard.

*

* Copyright (C) 2022 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 e2.chapter7;

import java.util.Iterator;

/**

* A specialized Deck that stored a reference to

* all the cards drawn since the last shuffle.

*/

public class MemorizingDeck extends Deck {

private CardStack aDrawnCards = new CardStack();

/**

* @return The cards drawn.

*/

public Iterator<Card> getDrawnCards() {

return aDrawnCards.iterator();

}

@Override

public void shuffle() {

super.shuffle();

// The null check is necessary because of field initialization order.

// Because the constructor of the superclass calls `shuffle()`, the call

// will also get dispatched down to this method when the constructor of `Deck` is

// executing. At that point, field `aDrawnCards` is not yet initialized. If you

// remove the null check, creating a new `MemorizingDeck` will raise a `NullPointerException`.

if( aDrawnCards != null ) {

aDrawnCards.clear();

}

}

@Override

public Card draw() {

Card card = super.draw();

aDrawnCards.push(card);

return card;

}

@Override

public MemorizingDeck clone()

{

MemorizingDeck clone = (MemorizingDeck) super.clone();

clone.aDrawnCards = new CardStack(aDrawnCards);

return clone;

}

}